JP2020019089A - Injection nozzle device - Google Patents

Abstract

To provide an injection nozzle device which improves a grinding efficiency and does not generate clogging of the nozzle due to powdered abrasive grain by injecting to an object, a composite jet flow surrounding the periphery of filamentous high-pressure liquid by the spiral flow of a pressure gas including an abrasive.SOLUTION: An objective injection nozzle device comprises: a main body 30 equipped inside with a space 35 for forming a truncated cone-shaped composite spiral flow; a guide groove 39 guiding a pressure gas spirally along an inner wall of the main body 30; a pressure gas supply tube 37 for supplying the pressure gas to the space along the guide groove 39; an abrasive supply tube 38 supplying the abrasive to the pressure gas to blend in the main body 30; and a liquid pressure-feeding nozzle 33 installed on the main body 30 to supply the injection jet of a high-pressure liquid on an axial core of the space. The device improves a grinding efficiency by making a composite jet flow surrounding the periphery of a small-diameter jet flow of the high-pressure liquid by the spiral flow of the pressure gas collide with a grinding object from the tip nozzle 32 of the main body 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a composite jet type jet nozzle device for grinding a target by grinding a target such as concrete by jetting a composite jet composed of a high-pressure liquid and a powdered abrasive to an object to be ground.

  In general, in the construction of widens on expressways, seismic reinforcement, or building wall reinforcement, the water jet method uses an ultra-high pressure water jet from a super-high pressure nozzle to break concrete without damaging the rebar. Is used. In this water jet method, ultra-high-pressure water squeezed finely from an ultra-high-pressure nozzle is jetted to an object (Patent Document 1), and abrasive grains are mixed into this jet to increase the grinding efficiency. (Patent Document 2).

JP-A-6-178953 JP-A-5-345277

  However, the scraping and peeling work of concrete or the like by the water jet method using the ultra-high pressure nozzle of Patent Document 1 is a water jet using only water and has a nozzle diameter of about 1 mm, so the grinding area is small, and the work efficiency is low. However, even if the water pressure is increased, there is a limit in improving the grinding efficiency.

  Further, the slurry nozzle disclosed in Patent Document 2 has a mixing chamber for mixing a water jet and abrasive grains inside the nozzle, and supplies the mixed slurry to a small-diameter, fixed-length nozzle member connected to the mixing chamber. The nozzle member has a small diameter, and is easily clogged by abrasive grains.

  In view of the foregoing, the present invention aims to improve the grinding efficiency by ejecting a composite jet surrounding a linear high-pressure liquid with a swirling flow of a pressurized gas containing an abrasive to an object, and to improve powder abrasive grains of a nozzle. It is an object of the present invention to provide an injection nozzle device which does not cause clogging.

  The injection nozzle device of the present invention includes a main body having a frusto-conical composite swirl flow forming space for forming a frusto-conical composite swirl flow therein, and pressurized gas in a spiral shape along the inner wall of the main body. A pressurized gas guide member for guiding, a pressurized gas supply pipe for sending the pressurized gas to the space along the guide member, and an abrasive material for supplying an abrasive to the pressurized gas so as to be mixed in the main body. A supply pipe, and a liquid pumping nozzle mounted on the main body for supplying a jet of high-pressure liquid onto the axis of the space, including a grinding material around the small-diameter jet of the high-pressure liquid. The composite jet surrounded by the swirling flow of the pressurized gas was caused to collide with the object to be ground from the tip nozzle of the main body.

  The composite jet is composed of a jet jet of a small-diameter high-pressure liquid and a swirling jet of a pressurized gas mixture containing an abrasive, which is located radially outward and swirls around the jet jet.

  The main body may be formed of a resin.

  The pressurized gas guide member is a spiral groove, a plate-like fin or a protrusion formed on the inner wall of the main body, and the spiral is preferably formed so that the pitch gradually decreases in the tip direction of the main body. .

  Preferably, the tip of the pressure gas supply pipe is opened in the direction in which the pressure gas guide member is arranged, and the tip of the grinding member supply pipe is opened in the flow direction of the swirling flow of the pressure gas.

  It is preferable that the ratio of the diameter of the large-diameter end of the space, the diameter of the small-diameter end forming the injection port of the composite jet, and the length along the axis of the space is 2: 1: 1: 3.

  In the present invention, the pressurized air as the pressurized gas is turned into a swirling flow in the nozzle device main body, and the abrasive is mixed with the swirling flow. Since the composite jet is ejected from the tip nozzle at the tip of the main body so as to surround the object, the composite jet jetted from the tip nozzle has a larger diameter than the conventional one, thereby significantly increasing the grinding area. And the grinding efficiency increases. Also, the abrasive is mixed with the swirling flow of the surrounding air without mixing the abrasive into the small diameter jet of water (no slurry is formed), whereby the diameter of the tip nozzle can be set large, and the tip nozzle can be clogged. Does not occur.

  In addition, if the pitch of the spiral guide member for guiding the pressurized gas in the body axis direction is gradually reduced as approaching the tip of the injection nozzle body, the speed of the mixed swirling flow is gradually increased, and the speed of the swirling is increased. While maintaining a small diameter jet of water at the center, the grinding effect of the swirling flow containing abrasive grains increases.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the road shearing apparatus which applied the injection nozzle apparatus of this invention to road grinding work. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the gun-type wall surface grinding apparatus which applied the injection nozzle apparatus of this invention to the grinding work of a building. It is a perspective view of the injection nozzle device of the present invention. It is a longitudinal section of an injection nozzle device of the present invention. It is explanatory drawing which shows the jet state seen from the upper surface of the injection nozzle apparatus of this invention. It is explanatory drawing which shows the composite jet state of the front-end | tip part of the main body of the injection nozzle apparatus of this invention. It is a partial perspective view showing other examples of the pressure gas guide member formed in the inner wall of the injection nozzle device of the present invention. FIG. 11 is a partial perspective view showing still another embodiment of the pressurized gas guide member formed on the inner wall of the injection nozzle device of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Figure 1, in Figure 2, road chipping device M ₁ for performing a chipping operation or separating operation of the concrete surface 2 provided with a jet nozzle device 1 of the present invention includes a frame 3 movable, this platform 3 Is supported by wheels 4, 4, and the spray nozzle device 1 is horizontally moved back and forth and right and left along the support frame 5 of the gantry 3 to wrap around a linear water jet, which is a high-pressure liquid, with an abrasive. Grinding concrete surface by composite jet with circular cross section.

  The gantry 3 includes a water supply tank 6 for supplying high-pressure water to the injection nozzle device 1, an ultra-high pressure pump 7 for supplying water from the water supply tank 6 to the high pressure and forcing the water to the injection nozzle device 1, An air tank 8 for storing air of the compressed gas, a compressor 10 for supplying the air to the injection nozzle device 1 through a flow control valve 9, garnet or silica sand used for sandpaper or the like And a compressor 12 for supplying a predetermined amount of the abrasive to the injection nozzle device 1 and electrically connecting these mechanical elements. A controller C for controlling is provided.

2, the wall 20 of the building shows the grinding apparatus M ₂ for grinding, the噴研cutting device M ₂ format nozzle gun is employed as the injection nozzle device 1 of the present invention is supported on the tip of the nozzle gun 21 , the injection nozzle system 1, the mechanical elements in the road chipping device M ₁ is connected.

  Hereinafter, the structure of the injection nozzle device 1 of the present invention will be described.

  3 and 4, the nozzle apparatus 1 of the present invention includes an inverted truncated cone-shaped casing main body 30, the upper surface of which is closed by a circular closing plate 31, and the lower surface of which has a composite jet. A tip nozzle 32 for jetting is connected. At the center of the closing plate 31, a liquid pressure feeding nozzle 33 for jetting water as a high-pressure liquid in a linear manner is connected. The casing body 30 and the closing plate 31 are preferably formed of an easily moldable resin such as acrylic, but may be made of metal. In the case of cleaning the metal surface, alcohol or the like can be used as the pressure liquid.

The nozzle diameter of the liquid pressure feeding nozzle 33 is about 1 mm, whereby the water jet 34 having a diameter of about 1 mm descends along the axial center position of the injection nozzle device 1 to form a composite jet, and collides with an object via the tip nozzle 33. . Water from the water supply tank 6 is supplied to the liquid pressure feeding nozzle 33 by being pressurized by the ultrahigh pressure pump 7 to a pressure of about 1800 to 2500 kg / cm ² . The high-pressure water jet 34 generates a negative pressure in the inverted-cone-shaped compound swirl flow forming chamber 35 in the main body 30 of the injection nozzle device 1 due to its ejector effect, and thereby strong suction toward the downstream side. A force is generated, and the negative pressure is adjusted by a negative pressure adjusting valve 36 attached to the main body 30. Incidentally, the the diameter _{D 1} of about 30mm of the top surface of the main body 30, the axial length L in the lower surface of the diameter _{D 2} of about 15mm is preferably about 90 mm. That is, it is preferable to set D ₁ : D ₂ : L = 2: 1: 3.

Air from the air tank 8 is sent to the closing plate 31 through the flow control valve 9 under pressure (7 kg /
cm ³⁾ other air supply pipe 37 which may be a gas) is supplied (tip opening 37a of the air (such as nitrogen as pressure gas for) and abrasive supply pipe 38 for supplying the abrasive of the powder (Tip opening 38a) is attached. As shown in FIG. 4, a spiral guide groove 39 is formed on the inner wall of the main body 30, and the pitch of the spiral guide groove 39 becomes narrower as it descends (the pitch of the upper part of the main body: the pitch of the lower part of the main body = 2: 1). The compressed air spirally descends along the guide groove 39 to generate a high-speed rotating swirling flow, and the abrasive is sucked and mixed from the abrasive supply pipe 38 into the high-speed rotating airflow. The leading end of the air supply pipe 37 is open along the guide groove 39 so that an air flow along the guide groove 39 is generated. Is open to drain out.

  The abrasive is supplied at a rate of about 3 kg / min. As shown in FIGS. 5 and 6, the abrasive is supplied inside the air swirl flow 40 along the inner wall of the main body to generate a mixed swirl flow 41. A composite jet 42 is formed around the water jet 34 injected at the axial center position, and the composite jet 42 is formed around the water jet 34, and the velocity of the composite swirl 41 gradually increases around the water jet 34 at the center of the composite jet. Cover and hold the water jet in the center position. By setting the diameter of the composite jet 42 to about 15 mm, the diameter of the tip nozzle 32 can be made the same, and the diameter of the conventional water jet is about 1 mm, whereas the grinding area is 15 × 15 = 225. It has been confirmed that the work efficiency of the razor is approximately tripled.

  Since the diameter of the tip nozzle 32 on the lower surface of the main body is as large as about 15 mm, clogging of the mixed swirling flow containing abrasive grains does not occur.

  A spiral guide groove 39 for generating a high-speed swirling flow 41 is formed on the inner wall of the main body 30. Instead, a plate-like spiral fin 50 is planted on the inner wall as shown in FIG. Alternatively, a spiral projection 51 may be formed on the inner wall as shown in FIG.

  The spray nozzle device of the present invention can be used for repairing roads, repairing wall surfaces of buildings, or cleaning metal surfaces.

DESCRIPTION OF SYMBOLS 1 ... Injection nozzle apparatus 3 ... Stand 20 ... Wall surface 21 ... Nozzle gun 30 ... Casing main body 32 ... Tip nozzle 33 ... Liquid pressure feeding nozzle 34 ... Water jet 35 ... Complex swirl flow forming chamber 37 ... Air supply pipe 38 ... Abrasive supply pipe 39 ... Guide groove 40 ... Air swirl flow 41 ... Mix swirl flow 42 ... Compound jet

Claims (6)

A main body having a truncated cone-shaped compound swirl flow forming space for forming a truncated cone-shaped swirl flow therein;
A pressure gas guide member for guiding the pressure gas spirally along the inner wall of the main body,
A pressure gas supply pipe for sending the pressure gas to the space along the guide member;
An abrasive supply pipe for supplying the pressurized gas so as to mix the abrasive in the main body,
A liquid pumping nozzle mounted on the main body for supplying a jet of high-pressure liquid onto the axis of the space,
An injection nozzle device for causing a composite jet, which surrounds a small-diameter jet of high-pressure liquid by a swirling flow of a pressurized gas containing an abrasive, to impinge on an object to be ground from a tip nozzle of a main body.   The injection nozzle device according to claim 1, wherein the composite jet comprises a jet jet of a small-diameter high-pressure liquid and a swirling jet of a pressurized gas mixture containing an abrasive, which is located radially outward and swirls around the jet jet.   The injection nozzle device according to claim 1, wherein the main body is formed of a resin.   2. The pressure gas guide member is a spiral groove, a plate-like fin or a protrusion formed on an inner wall of the main body, and the spiral is formed so that a pitch gradually decreases in a tip direction of the main body. Injection nozzle device. The tip of the pressure gas supply pipe opens in the direction in which the pressure gas guide member is disposed,
The injection nozzle device according to claim 1, wherein a tip of the grinding member supply pipe is opened in a flow direction of the swirling flow of the pressurized gas.   2. The injection nozzle device according to claim 1, wherein the ratio of the diameter of the large-diameter end of the space, the diameter of the small-diameter end forming the injection port of the composite jet, and the length along the axis of the space is 2: 1: 1. 3. .

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