JP4801636B2 - Nozzle switching valve device in boom multi-headed injection tube - Google Patents

Description

  According to the present invention, a plurality of nozzles provided with a plurality of nozzles are attached to an intermediate portion of a boom-like long liquid guide pipe in parallel in the longitudinal direction of the liquid guide pipe, and a chemical solution is arranged in parallel. The present invention relates to an improvement in a nozzle switching valve device that switches supply of a chemical solution to a plurality of nozzles provided on the tip side of a body of a jet tube in a boom multi-head jet tube that is sprayed at a time.

  The boom multi-headed jet tube has a connection port connected to a branch pipe in the longitudinal direction of the liquid guide pipe in the longitudinal middle part of the long boom-shaped liquid guide pipe mounted on the fuselage body for spraying the chemical liquid. A large number of them are installed in parallel, and each of these connection ports is connected to an injection pipe equipped with a plurality of nozzles. It is used so that it is sprayed at once from each of the nozzles provided in a large number of nozzles that are supported in parallel with the boom-shaped liquid introduction pipe.

  A jet tube (boom multi-headed jet tube) that is assembled and connected in parallel with an intermediate portion of a boom-shaped liquid guide tube is usually a base end of a body a formed in a cylindrical shape of the jet tube A as shown in FIG. The connecting portion 1 on the side is provided with a connecting tube 10 that is connected to a connecting port b provided in a branch shape in the boom-shaped liquid introduction tube B, and a plurality of nozzle connecting ports are provided on the jet head 2 on the distal end side of the body a. 20 is provided so as to project radially from the outer peripheral surface. In the body a, there are a plurality of conduits for guiding the chemical introduced from the connection pipe 10 toward the nozzle n connected to the nozzle connection port 20, and a plurality of the pipes. A switching valve device that switches to select and communicates with one of the nozzles n of the nozzle n, and when the liquid spraying operation is stopped, the liquid drop is prevented from dropping around the nozzle due to the residual pressure of the chemical liquid It has a configuration with a button drop prevention valve mechanism That.

  The conventional nozzle switching valve device that equips the boom multi-headed jet tube A to switch the flow of the chemical solution to the plurality of nozzles provided on the distal end side of the body a is as follows. A valve is used to close a plurality of valve ports and release only one valve port in order, or (2) a flow path for a chemical solution in the body on the wall surface that forms the seal portion of the cylindrical body An annular ring made of a soft resin is rotatably fitted on the outer peripheral side of the wall surface forming the seal portion, and the seal portion is sealed on the inner peripheral surface thereof. A communication port communicating with each of the plurality of nozzles is provided in parallel in the rotation direction, and the communication with the plurality of nozzles is switched by rotation of the ring, or (3) a conical shape made of a rotating metal material Each of a plurality of nozzles provided on the wall surface having a concave surface with an opening that leads to the flow path of the chemical solution established on the peripheral surface of the conical body. This is done by any one of the three means of sequentially switching and facing the opening communicating with the.

  In these first means, the first means of (1) closes the main plug of the liquid supply passage for supplying the chemical liquid to the boom multi-headed jet tube A, and lowers the pressure of the chemical liquid in the jet tube A. There is a problem that the nozzles cannot be switched in accordance with the condition of the object to be sprayed at the working position where the spraying is performed because the switching cannot be performed unless the state is set.

  The second means (2) is capable of switching at the working position while the chemical solution in the liquid supply passage remains in a pressurized state, but the ring is heavy and the flow channel for supplying the chemical solution is used. It is difficult to correctly match the opening that communicates with the opening that communicates with the flow path on the nozzle side, and it takes time to set the switching. Further, there is a problem that the seal portion is insufficiently sealed, and when the pressurization pump is operated at the start of work and the hand cock is opened, water leakage and dripping from the switching mechanism portion increase.

  Further, in the third means (3), there is a problem that a rotating operation for switching becomes difficult if the seal is sufficient because of a conical mechanism in which metal materials are joined together.

  The problem to be solved by the present invention is that a boom multi-headed jet tube is fed to a plurality of nozzles provided on the distal end side of the body of the boom from a connection port provided on the proximal end side of the body. The nozzle switching valve device that equips the nozzle switching valve device, which is equipped to switch and guide the chemical solution to one nozzle selected as desired from among the plurality of nozzles, opens the cock at hand, and the chemical solution in the flow path to the nozzle In the state where the pressure is applied, the sealing portion can be surely sealed while the switching setting operation can be easily performed.

In order to solve the above-described problem, in the present invention, as described in claim 1,
The ball Di a, a connecting pipe 10 to the peripheral surface and the connecting portion 1 made of a resin material provided on the branch pipe shape, to the噴頭portion 2 made of resin material having a plurality of nozzle connection opening 20 radially on the peripheral surface In the connecting portion 1, a shaft cylinder portion 11 provided with a flow path 6 communicating with a pipe line in the connecting pipe 10 on the tip side is formed in a cylindrical shape whose outer diameter corresponds to the inner diameter of the jet head 2. In the boom multi-head tube A that is formed and protruded toward the jet head 2 and rotatably mounts the jet head 2 on the outer periphery of the shaft cylinder portion 11, the shaft cylinder portion 11 has a circumferential surface. Forming a crescent-shaped notch 5 in the axial view in which the bottom surface crossing the circumferential surface of the axial tube portion 11 along the circumferential direction is flat and the outer circumferential surface follows the circumferential surface of the axial tube portion 11 , the central portion of the bottom of the notch 5, opened an opening 50 communicating with the flow path 6, the concave and Katachi設an annular groove 51 around the opening 50 The O-ring 71 made of an elastic material fitted into the 51, this notch portion 5, the Teflon sheet 7 made of (R) soft such as a resin, the lower surface side among the upper surface side in the plane of the噴頭2 opening through hole 70 in the arcuate surface and the viewed axially fitting is molded into a crescent shape to fill the cut-out portion 5 extends through the outer surface side at a portion which faces the opening 50 of the sheet 7 which follows the circumferential wall and, the噴頭unit 2, an opening 21 leading to each of the plurality of nozzles connecting port 20 provided on the outer peripheral side to that of the inner peripheral wall, and opened by parallel in the circumferential direction, the噴頭portion 2, the notch part 5 on the outer periphery of the cylindrical portion 11 of the connecting portion 1 is fitted with a crescent-shaped sheet 7 rotating freely mating, of upper peripheral surface噴頭section 2 of the sheet 7 that is pushed up by the elasticity of the O-ring 71 Water-tightness around the opening 21 due to the sliding surface with the peripheral wall Filed nozzle switching valve device in the boom multiple head噴管characterized in that as allowed to lifting, also in conjunction with this,
And the outer peripheral surface of the cylindrical portion 11 projecting from the front end side of the connecting portion 1 made of a resin material, on the inner peripheral surface of the噴頭portion 2 made of resin material which is fitted on the outer peripheral side of the cylindrical portion 11, which On the inner peripheral surface of one of the jet heads 2 , engaging grooves 4 that are recessed in the radial direction from the inner peripheral surface in a direction close to the base end side and in the direction along the axial center line are provided at a predetermined pitch in the circumferential direction. juxtaposed was provided annularly other on the outer peripheral surface of the cylindrical portion 11, the engaging projection which engages sequential switched to the engagement groove 4 protruding radially from the outer peripheral surface portion with the base end side 40, and the opening 21 opened in the inner peripheral wall of the jet head 2 with respect to the through hole 70 opened in the seat 7 provided in the shaft tube portion 11 by the engagement between the engagement groove 4 and the engagement protrusion 40. At the water passage state position where the two nozzles join and the water stop state position where the inner peripheral wall of the jet head 2 between the opening 21 and the opening 21 joins the through hole 70. It is intended to raise the nozzle switching valve device in the boom multiple head噴管of claim 1, wherein Rukoto a provided set to so that.

  In the nozzle switching valve device in the boom multi-headed jet tube according to the present invention, the seal of the switching portion for switching and communicating the opening 50 provided in the flow path of the chemical solution inside the jet tube with respect to the openings 21 respectively connected to the plurality of nozzles, On the sliding surface between the arc-shaped outer surface of the sheet 7 fitted through the O-ring 71 made of an elastic material and the inner peripheral wall of the jet head 2 in the notch portion 5 formed on the peripheral surface on the tip end side of the shaft tube portion Therefore, the sliding operation is small, and the switching operation performed by rotating the jet head 2 with respect to the connection portion 1 which is the main body of the jet tube can be easily performed without requiring a large force.

  The seal of the switching portion is reliable because the arcuate outer surface side of the seat 7 comes into close pressure contact with the inner peripheral surface of the jet head 2 by the elastic restoring force of the elastic O-ring 71. Become.

  In addition, a large number of engaging grooves 4 arranged in a ring shape between the nozzle 11 provided on the connecting portion 1 serving as the main body of the jet tube and the jet head 2 rotating on the outer periphery thereof, and these When the engaging protrusion 40 that sequentially engages the engaging groove 4 in a frame-feed manner is provided so that positioning is performed when the jet head 2 is rotated with respect to the connecting portion 1, one frame at a time, By rotating, it becomes possible to switch between a water flow state and a water stop state appropriately.

  Further, the button dropping prevention valve mechanism incorporated in the injection tube operates properly by utilizing the shaft tube portion 11 of the nozzle switching valve device.

  Next, embodiments of the present invention will be described in detail with reference to the drawings of the embodiments.

  FIG. 2 is a longitudinal sectional view of a boom multi-headed jet tube A embodying the present invention, FIG. 3 is a front view of the same jet tube, and FIG. 4 is a longitudinal view in a state where each component is disassembled before assembling the same jet tube A. It is a side view.

  In FIG. 2, A is the whole of the injection tube, a is the body of the injection tube A, 1 is the connection portion on the base end side of the body a, and the connection tube 10 is provided in a peripheral shape on the peripheral surface, and 2 is the body The jet head which provides the some nozzle connection port 20 which protrudes radially on the surrounding surface of the front end side of a is shown.

  As shown in FIG. 5, the body “a” of the jet tube A is provided with a cylindrical connection portion 1 provided with a connection tube 10 projecting in a support tube shape on the peripheral surface, and a plurality of nozzle connection ports 20 on the peripheral surface. The connecting portion 1 and the jet head 2 are molded separately from each other by a resin material.

  In the jet head 2 formed into a cylindrical shape, openings 21 communicating with the respective nozzle connection ports 20 provided on the outer peripheral side are formed in the inner peripheral wall of the jet head 2 at positions equally distributed in the circumferential direction. An assembly hole 22 is formed in the end wall on the distal end side.

  The connecting portion 1 is integrally and continuously provided with a shaft cylinder portion 11 fitted into the inner cavity of the jet head 2 at the distal end side thereof. The shaft cylinder portion 11 has an outer diameter corresponding to the inner diameter of the jet head 2, a protruding length L corresponding to a length L ′ in the axial direction of the jet head 2, and a shaft core wire connected thereto It is provided so as to align with the axis of the part 1. A shaft flange portion 12 is provided at the distal end of the shaft cylinder portion 11 so as to be fitted into and protrude from an assembly hole 22 formed in the center portion of the end wall on the distal end side of the jet head 2. Is provided with an annular groove 13 into which the retaining ring 3 is fitted.

  Then, the connecting portion 1 and the jet head 2 are provided in the end wall on the tip side of the jet head 2 by inserting the shaft cylinder portion 11 projecting from the tip side of the connection portion 1 into the inner cavity of the jet head 2. By inserting and retaining the retaining ring 3 in the annular groove 13 of the shaft flange portion 12 protruding from the assembled hole 22, the jet head 2 is connected to the connecting portion 1 with the shaft tube portion 11 as a support shaft. They are connected in a state of being connected so as to rotate freely.

  On one of the outer peripheral surface on the base end side of the shaft tube portion 11 and the inner peripheral surface on the base end side of the jet head 2, an engagement groove 4 in the direction along the axial center line is provided on one of them in the circumferential direction. Provided in parallel with the pitch in a rack shape so as to be continuous in an annular shape, and provided on the other side are engagement protrusions 40 that fit into the engagement grooves 4, and the engagement grooves 4 and the engagement protrusions 40 are fitted to each other. Thus, when the jet head 2 is rotated with respect to the connecting portion 1 about the shaft tube portion 11, positioning is performed so as to temporarily stop the rotation one by one.

  Further, on the peripheral surface on the distal end side of the shaft tube portion 11, a cutout portion 5 having a crescent shape as viewed in the axial direction and having a flat bottom surface is formed on a part of the peripheral surface. An opening 50 is formed in the center portion of the bottom surface and communicated with the chemical liquid flow path 6 formed in the shaft core portion of the shaft cylinder portion 11. Further, an annular concave groove is formed on the peripheral surface of the opening 50. 51 is formed. The opening 50 is sequentially formed in the opening 21 of the nozzle connection port 20 opened in the inner peripheral wall of the jet head 2 by the rotation of the jet head 2 in a state where the shaft tube portion 11 is fitted and assembled in the inner cavity of the jet head 2. , And are set and set at positions facing each other.

  7 is a sheet that is fitted into a notch 5 that is formed on a part of the peripheral surface on the front end side of the shaft cylinder 11, and is a soft resin material such as Teflon (registered trademark), the lower surface is flat, and the upper surface is a jet An arc surface that follows the inner wall surface of the portion 2 is formed in a crescent shape that fills the cutout portion 5 when viewed in the axial direction, and when the cutout portion 5 is fitted into the cutout portion, the cutout portion is formed. A through hole 70 penetrating on the upper surface side of the sheet 7 is provided at a portion corresponding to the opening 50 provided on the bottom surface of 5.

  And this sheet 7 is inserted in the notch 5 formed in a part of the peripheral surface of the shaft cylinder part 11 before the shaft cylinder part 11 is inserted in the lumen of the jet head 2, In this state, it is inserted into the inner cavity of the jet head 2 together with the shaft tube portion 11.

  At this time, an O-ring 71 made of an elastic material is fitted in an annular groove 51 formed around the opening 50 opened on the bottom surface of the notch portion 5, and this sheet together with the shaft tube portion 11 is fitted. When 7 is inserted into the inner cavity of the jet head 2, the periphery of the joint portion between the opening 50 and the through hole 70 provided in the sheet 7 is crushed between the bottom surface of the notch 5 and the lower surface of the sheet 7. The O-ring 71 made of an elastic material becomes watertight.

  Further, the seal between the edge of the through hole 70 opened on the upper surface of the sheet 7 and the inner peripheral wall of the jet head 2 is formed by the arc-shaped upper surface of the sheet 7 formed of a soft resin material. The elastic restoring force of the O-ring 71 is pressed against the inner peripheral wall of the jet head 2 so that the sliding contact surfaces are used.

  That is, the chemical solution is guided from the lumen of the connecting tube 10 to the opening 50 of the cutout portion 5 through the lumen 6 of the shaft tube portion 11, and the through hole 70 provided in the sheet 7 from the opening 50. The flow path of the chemical solution provided in the body a of the injection tube A so as to lead to the nozzle n to be attached to the nozzle connection port 20 through the opening 21 of the nozzle connection port 20 is one of the peripheral surface of the shaft tube portion 11. The through-hole 70 that can be formed in the sheet 7 fitted in the notch portion 5 provided in the portion of the nozzle connection port 20 selected from among the openings 21 that communicate with the plurality of nozzle connection ports 20 provided in the jet head 2. When the connection with the opening 21 is established, the arcuate upper surface of the sheet 7 positioned around the joint portion between the through hole 70 and the opening 21 is pressed against the inner peripheral surface of the jet head 2. Sealing is performed at the pressure contact portion, leakage of the chemical solution from the flow path and other openings 21. When the through hole 70 of the seat 7 is located between the opening 21 and the opening 21 formed in the inner peripheral wall of the jet head 2, the upper surface side of the seat 7 and the jet head 2 Sealing is performed at the pressure contact surface with the inner peripheral wall to block communication with the nozzle connection port 20 of the flow path, and a water stop state is established.

  The sheet 7 is rotated along the inner surface of the inner peripheral wall of the jet head 2 by the rotation of the shaft cylinder portion 11, whereby the through holes 70 of the sheet 7 are switched with respect to the respective openings 21 of the plurality of nozzle connection pipes 20. The state of water flow performed by the connection and the water stop state due to the positioning of the through hole 70 of the seat 7 between the opening 21 and the opening 21 are the By positioning the rotational position by the engagement performed in a frame-feed manner, the engagement groove 4 and the engagement protrusion 40 provided between the outer peripheral surface and the inner peripheral surface of the base end portion of the jet head 2 are alternately arranged. Is set to be performed.

  8 is the pressure of the chemical liquid remaining in the flow path of the chemical liquid from the liquid introduction pipe B to the nozzle n provided on the tip side of the injection pipe A when the main plug at hand is closed to temporarily stop the spraying work. In order to prevent the chemical liquid from dropping from around the nozzle n, a prevention valve mechanism for preventing the dropping of the liquid is provided in the body a of the injection tube A.

  In this embodiment, the prevention valve mechanism 8 is protruded toward the distal end side of the connecting portion 1 so as to constitute a nozzle switching valve device that allows the chemical liquid to flow and stop the water in the nozzle n as described above. The shaft cylinder portion 11 provided is configured.

  That is, the flow path 6 formed in the axial core portion of the shaft cylinder portion 11 is extended toward the proximal end side of the connection portion 1 by the inner cylinder 80 installed in the axial core portion of the lumen of the connection portion 1. The connecting tube 10 is opened to the inner cavity of the connecting portion 1 by the opening 81 on the proximal end side of the inner tube 80, and is provided around the inner tube 80 as a support tube on the outer peripheral side of the connecting portion 1. An annular channel 82 communicating with the inner pipe line is formed, and the opening 83 on the downstream side of the annular channel 82 is released around the opening 81 on the base end side of the inner cylinder 80, A disc-shaped valve membrane 84 made of an elastic material such as a rubber material is inserted into the opening 81 and the opening 83 from the opening 14 that opens to the base end side of the connecting portion 1 and closes. 84, the opening 11 on the proximal end side of the connecting portion 1 is closed by the peripheral portion of the connecting portion 1, and a coil spring is provided on the outer surface side of the valve membrane 84 via a spring seat 85. 6, the other end side of the coil spring 86 is supported by a spring cover 87, and the base of the connection portion 1 is secured by a cap 88 that is screwed to the outer periphery of the connection portion 1 on the base end side. It is configured by fixing to the end side.

  The preventive valve mechanism 8 for preventing the dropping of the so configured is configured to flow into the body a through the connecting pipe 10 when the main plug at hand is open and the chemical liquid pressurized by the pump is supplied. The valve membrane 84 is pushed outward against the spring pressure of the coil spring 86 by the pressure of the incoming chemical solution, and the opening 83 of the annular channel 82 and the opening 81 on the proximal end side of the inner cylinder 80 are opened. Then, the chemical solution flows through the opening 81 and the opening 83 to the flow path 6 inside the shaft tube portion 11, reaches the nozzle switching valve device, and the through hole 70 opened in the seat 7 of the device is the shaft tube portion 11. When the water is in communication with the opening 21 of the selected nozzle connection port 20 due to the rotation of the nozzle, the water is sprayed from the nozzle n. Also, the main plug at hand is closed and sprayed temporarily. When the operation is stopped, the valve membrane 84 is attached to the coil spring 86. In closed, chemical from the sealing portion of the nozzle switching valve device by residual pressure of the chemical liquid in Shirubeekikan B acts to prevent the fall button.

It is outline | summary explanatory drawing of a beam multi-head jet tube. 1 is an overall perspective view of a beam multi-head tube that implements a nozzle switching valve device according to the present invention. It is a vertical front view of a jet tube same as the above. It is the side view seen from the front end side of a beam multiple head tube same as the above. It is the longitudinal cross-sectional view which decomposed | disassembled the same nozzle tube. It is an enlarged front view of the principal part of a jet tube same as the above. It is a longitudinal cross-sectional view of the II line in FIG. 3 of a jet tube same as the above.

Explanation of symbols

A Boom multi-head jet B B Liquid introduction pipe L Projection length L 'Length in the axial direction a Body b Connection port n Nozzle 1 Connection part 10 Connection pipe 11 Shaft tube part 12 Shaft flange part 13 Groove 14 Opening port 2 Jet head DESCRIPTION OF SYMBOLS 20 Nozzle connection port 21 Opening 22 Assembly hole 3 Retaining ring 4 Engagement groove 40 Engagement protrusion 5 Notch part 50 Opening 51 Annular groove 6 Flow path 7 Seat 70 Through-hole 71 O-ring 8 Prevention valve mechanism 80 Inner cylinder 81 Open port 82 Channel 83 Open port 84 Valve membrane 85 Spring seat 86 Coil spring 87 Spring cover 88 Cap

Claims (2)

Bo Di (the a), the connecting portion made of a resin material provided connecting tube (10) to the branch pipe shape on the peripheral surface (1), provided a plurality of nozzles connecting port (20) radially on the peripheral surface resin It is divided into the jet head (2) made of a material , and the connecting portion (1) is provided with a shaft tube portion (6) provided with a flow path (6) communicating with a pipe line in the connecting pipe (10) inside the connecting portion (1). 11) is formed in a cylindrical shape having an outer diameter corresponding to the inner diameter of the jet head (2) and protrudes toward the jet head (2), and the jet head (2) is provided on the outer periphery of the shaft cylinder portion (11). In the multi-headed boom tube (A) that is rotatably fitted , the shaft tube portion (11) crosses the circumferential surface of the shaft tube portion (11) along the circumferential direction at a part of the circumferential surface. A crescent-shaped cutout portion (5) is formed in an axial view in which the bottom surface is flat and the outer peripheral surface follows the peripheral surface of the shaft tube portion 11, and the flow channel (5) is formed at the center of the bottom surface of the cutout portion (5). 6) Opened opening (50) leading, fitted the O-ring (71) made of an elastic material to the groove (51) in and Katachi設annular concave groove (51) around its opening (50) , this notch (5) in a Teflon (registered trademark) soft made of a resin sheet (7), the lower surface side has an arc surface which is the upper surface in the plane to follow the inner peripheral wall surface of the噴頭portion (2) Formed and fitted into a crescent-shaped shape filling the notch (5) when viewed in the axial direction , a through-hole (70) penetrating to the outer surface side is opened at a portion facing the opening (50) of the sheet (7) and, the噴頭portion (2), respectively the leading opening of the plurality of nozzles connected port provided on the outer peripheral side to that of the inner peripheral wall (20) (21), by opening by parallel in the circumferential direction, this噴頭part (2), the notch (5) fitting the crescent-shaped sheet (7) connection (1 Fitted on the outer periphery of the cylindrical portion (11) rotating freely, by sliding contact surface with the inner peripheral wall of the upper peripheral surface噴頭portion of sheet to be pushed up by the elastic (7) of the O-ring (71) (2) A nozzle switching valve device in a boom multi-head jet tube characterized in that the water tightness around the opening (21) is maintained . And the outer peripheral surface of the cylindrical portion projecting from the front end side of the connecting portion made of a resin material (1) (11),噴頭portion made of a resin material is fitted to the outer periphery of the cylindrical portion (11) (2) Engagement grooves in the direction along the axial line that are recessed in the radial direction from the inner peripheral surface at a portion closer to the base end side on the inner peripheral surface of one of the jet heads (2). (4) is provided in an annular shape in parallel with a predetermined pitch in the circumferential direction, and on the outer circumferential surface of the other shaft tube portion (11), a portion close to the proximal end protrudes in the radial direction from the outer circumferential surface. the engaging projection 40 which engages provided sequential switches to groove (4), and the engagement between the engaging groove (4) and engaging projection (40) is provided in the cylindrical portion (11) The water passage state position where the opening (21) to be opened on the inner peripheral wall of the jet head (2) is joined to the through hole (70) to be opened in the sheet (7), and the opening (21) to the through hole (70). When Mouth (21) according to claim 1, wherein the boom multiple head噴頭portion inner peripheral wall (2), characterized in Rukoto a provided set as is done in the water stop state position of bonding between the噴管Nozzle switching valve device.

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