JP2008081289A - Opening and closing valve for supplying powder and granular material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening and closing valve for supplying a powder and granular material, stably supplying the powder and granular material from a pressure tank and preferable for an air blast device or the like. <P>SOLUTION: This opening and closing valve 14 is used in supplying a powder and granular material from the pressure tank 12 to a powder and granular material transport pipeline 50. The valve is provided with an inflow port 16 and an outflow port 18 in the vertical direction of upper and lower parts. An annular opening and closing passage 30 is formed by a cylindrical valve seat body (a core) 26 concentrically held on a valve case 20 and a sleeve-like diaphragm valve element (an opening and closing means) 28 disposed concentrically on the outer periphery of the valve seat body 26 and press-bonded/separated to and from the whole periphery of the valve seat body 26 between the inflow port 16 and the outflow port 18. A powder and granular material passing space 27 where the inflow port 16 and the outflow port 1 communicate with the annular opening and closing passage 30 is formed on the upper/lower confronting part of the valve seat body 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an on-off valve for supplying powder and a pressurized air blast device incorporating the same.

  Here, a pressurized air blast device will be described as an example. However, the on-off valve for supplying granular material according to the present invention is not limited to the pressurized air blasting device, and has a mechanism for supplying the granular material in the pressurized tank to the granular material transport pipe (powder supply pipe). The present invention can also be applied to various powder apparatus.

  More specifically, 1) an air transport device that transports powder particles using a pressure gas in the transport pipe provided, and 2) an abrasive material made of powder particles is caused to collide with compressed air or an impeller. Examples thereof include a blasting apparatus that performs surface processing, and 3) a powder coating apparatus that performs coating by spraying a powder paint made of powder with a spray gun (ejector).

  An injection material supply pipe for supplying an injection material (abrasive material; powder particles) to a compressed air mixing unit (mixing unit) in a pressurized air blasting device is provided with an injection material supply (for powder material supply). An on-off valve is arranged.

  A prior example of the on-off valve for supplying the injection material is shown in FIG.

  The on-off valve 114 includes a vertical inflow path (inlet) 116 formed on the upper side of a valve case (valve box) 120 in which a horizontal mixing section 146 is integrally formed, and the horizontal mixing section orthogonal to the vertical inflow path 116. An opening / closing part is formed between the 146 and 146. The open / close portion has a tip hemisphere in which a valve seat surface 126a formed at the lower end portion of the vertical inflow passage 116 advances and retreats (in the horizontal direction) with respect to a vertical valve seat portion (the axis is horizontal) 126. The rubber valve body 128 is formed. The rubber valve body 128 is driven by a diaphragm 131 that moves back and forth in the horizontal direction by the air pressure of the air cylinder 129. In the illustrated example, reference numeral 133 denotes an inspection port (view window).

  The injection material (powder particles) that flows into the vertical inflow path 116 from the lower end funnel portion 112a of the pressurized tank 112 with its own weight flows approximately 90 ° from the vertical direction to the horizontal direction at the opening of the valve seat portion 126. The valve seat 126 and the valve opening 128 of the retracted valve body 128 flows out. The injection material flowing out from the valve opening gap S flows again into the mixing section (mixing section) 146 and mixed with the compressed fluid (pressurized air) by the pressure applied from the pressurized tank and the ejector effect of the injection flow path. Then, it is conveyed to an injection (blast) nozzle through a blast hose.

  However, it has been found that the on-off valve for supplying an injection material having such a configuration lacks the flow rate stability of the injection material.

  The following patent documents 1 and 2 exist as prior art documents related to this kind of on-off valve for supplying an injection material. None of these affect the patentability of the present invention.

  Patent Literature 1 describes a granule supply valve (powder supply on / off valve) for a blasting device that opens and closes a valve by driving a semispherical valve body by an air piston.

Patent Document 2 describes a granular material flow rate control valve that adjusts the supply and flow rate of granular material with an electric slide gate.
Japanese Patent No. 2789513 (Claims, FIGS. 1 and 2) JP 10-175170 A (summary etc.)

  This invention makes it a subject (object) to provide the opening / closing valve for powder supply which can supply powder stably with the novel structure which is not in the past.

  The present invention solves the above problems by the following configuration. In addition, although a figure code | symbol is attached | subjected for easy understanding (refer FIGS. 2-5), they do not affect the technical scope of this invention at all.

An on-off valve 14 used when supplying the granular material from the pressurized tank 12 to the granular material transport pipe 50,
The valve case 20 of the on-off valve 14 is an upright cylindrical shape and is provided with an inlet 16 and an outlet 18 in the vertical direction of the upper and lower parts, and for quantifying the flow rate of the granular material on the inlet 16 side. The orifice tube 25 is detachably provided,
Between the inflow port 16 and the outflow port 18, a cylindrical valve seat body (core) 26 concentrically held by the valve case 20, and a valve seat body concentrically arranged on the outer periphery of the valve seat body 26. An annular opening / closing path 30 is formed with a cylindrical diaphragm-type valve element (opening / closing tool) 28 that is crimped / detached on the entire circumference of 26,
In the upper and lower surface portions of the valve seat body 26, a granular material passage space 27 in which the inflow port 16 and the outflow port 18 communicate with the annular opening / closing path 30 is formed.

  Here, the annular opening / closing path 30 includes both open and closed states.

  With the above configuration, the flow rate of the powder after passing through the orifice tube 25 is stabilized. The reason for this is that the granular material after passing through the orifice pipe 25 is connected to the orifice pipe 25 and is located above the valve seat body 26 from the columnar flow path G1 via the annular switching path 30 and below the columnar flow path G2. It is presumed that the powder flows out in a state of free falling through the flow, and it is difficult for disturbance (clogging, etc.) of the powder flow due to interference between the powder particles.

  Moreover, the on-off valve 14 having the above-described structure has a simple structure and has no operating parts such as a bearing and a sliding part, so that there is almost no failure.

  Further, the valve seat body 26 is provided at the center, and the valve body 28 is crimped to and detached from the entire outer peripheral surface of the valve seat body 26, so that the deformation of the valve body (valve action portion) 28 can be minimized. Further, a decrease in durability due to repeated deformation is suppressed as much as possible.

  Moreover, since it is the structure which crimps | bonds the outer peripheral surface whole periphery of a valve seat body with a valve body, a crimping | compression-bonding area can be taken large and the opening / closing with respect to the powder body of a valve action part can be ensured.

The specific structure in the above configuration is that the valve case 20 is disposed above and below the case main body 32 and the flange main upper and lower joints 34 and 36 which respectively form the inlet 16 and the outlet 18. And formed with
An annular inner engagement step portion 38 and an outer engagement step portion 40 that respectively hold the valve seat body 26 and the valve body 28 are formed on the opposing surfaces of the upper and lower joints 34 and 36, respectively.
A plurality of engaging column portions 26b for forming the granular material passage space 27 are formed near the upper and lower outer circumferences of the valve seat body 26, and the engaging column portions 26b are connected to the inner engagement of the upper and lower joints 34, 36. Holding the valve seat body 26 by engaging and sandwiching between the stepped portions 38,
A flange 28b is formed on the upper and lower sides of the valve body 28, and the flange 28b is engaged and clamped between the upper and lower outer circumferences of the case main body 32 and the upper and lower joints 34, 36 so that the valve body 28 is detachably held. It becomes the composition to do.

  In the above configuration, in order to increase the pressure-bonding area between the valve body and the valve seat portion, the valve seat portion 26a of the valve seat body 26 has a reduced diameter curved surface in the height direction, and the operating portion 28a of the valve body 28 is the It is good also as an inner side bulging surface corresponding to the valve seat part 26a.

  In each of the above-described configurations, the case main body 32 normally includes a working fluid supply port 44 that conducts to the valve body working space 33 formed between the outer periphery of the valve body 28 and the inner periphery of the case main body 32.

  In the on-off valve 14 in each of the above-described configurations, a T-shaped mixing portion joint 46 provided with a mixing portion M in the horizontal portion 46a for feeding compressed air into the lower joint 36 and mixing with the granular material, and a vertical portion thereof. Connect via 46b.

  The air blast device of the present invention connects the on-off valve having the above-described configuration to the pressurized tank 12 of the air blast device, and connects the compressed air supply hose 48 to one end of the horizontal portion of the mixing portion joint 46, and further to the other end. And a blast hose 50 with an injection nozzle connected thereto.

The method of supplying the granular material stored in the pressurized tank 12 from the pressurized tank 12 of the present invention to the granular material supply pipe 50 is as follows.
The granular material that has passed through the orifice pipe 25 from the pressurized tank 12 passes from the columnar channel positioned above the valve seat body 26 to the columnar channel positioned below the valve seat body 26 via the annular opening / closing channel 30. Let it flow down,
A cylindrical diaphragm-type valve body 28 is crimped to and detached from the entire circumference of the outer peripheral surface of the valve seat body 26 to be opened and closed to supply and stop the powder particles.

  Moreover, if the abrasive powder supply material (injection material) is supplied to the blast hose 50 with an injection nozzle and air blast processing is performed using the powder supply method of the said structure, it will become the pressurized air blast method of this invention. .

  The present invention will be described in detail with reference to the accompanying drawings based on an embodiment.

  In the present embodiment, the on-off valve for supplying granular material (hereinafter referred to as “on-off valve”) according to one embodiment is incorporated in a pressure blasting apparatus (see FIG. 2). Here, the pressure blasting device is a continuous type of a two-stage tank configuration of an injection material charging tank 54 and a pressure tank 12, but may be a batch type of a single-stage tank configuration having only a pressure tank.

  That is, the on-off valve 14 is arranged between the funnel portion 12a of the pressurized tank 12 and the mixing joint (mixing portion) 46 provided with the mixing portion M in the horizontal portion. In general, an upper side of the pressurized tank 12 is provided with an injection material charging tank 54 provided with a charging hopper 52 so that powder particles can be continuously supplied, and between the charging hopper 52 and the injection material charging tank 54. A check valve 56A is arranged. As with the pressurizing tank 12, the propellant charging tank 54 can be pressurized, and a check valve 56 is disposed between the pressurizing tank 12 and the propellant charging tank 54. And the check valve 56 is opened so that the injection material can be supplied from the injection material charging tank 54 to the pressure tank 12. That is, the amount of the injection material in the pressurized tank 12 is detected by the upper level sensor 58 and the lower level sensor 60, and can be adjusted by opening and closing the check valve 56 by the detection signal. Reference numeral 62 denotes a level sensor for restricting the amount of the injection material charging tank 54.

  The mixing portion (mixing portion) is formed by a T-shaped mixing portion joint 46 including a horizontal portion 46a and a vertical portion 46b. One end of the horizontal portion 46a is integrated with a furry portion 62 for connecting the compressed air supply hose 48, and the other end of the horizontal portion 46a is integrated with a flange portion 64 for connecting the blast hose 50. Further, the vertical portion 46 a can be coupled to the on-off valve 14 via the flange portion 66. In addition, an abrasion-resistant liner 68 is set on the inner surface of the mixing part joint 46 on the outlet side of the injected material after mixing compressed air.

  The valve case 20 of the on-off valve 14 is a standing cylinder, and has an inlet (supply port) 16 and an outlet (discharge port) 18 in the vertical direction of the upper and lower ends, and restricts the flow rate on the inlet 16 side. An orifice (throttle channel) 24 is provided.

  The valve case 20 incorporates an opening / closing mechanism including a valve seat body 26 and a valve body 28 as described below.

  A cylindrical valve seat body (core) 26 disposed at the center of the case body 32, and a tubular diaphragm type (sleeve diaphragm type) valve body (opening / closing tool) disposed concentrically with the valve seat body 26 ) 28 is held by upper and lower joints 34 and 36 which are fixed to the upper and lower ends of the case body 32 (in the illustrated example, screwed together).

  The upper and lower joints 34 and 36 each have an inlet (powder particle supply port) 16 and a discharge port (powder particle discharge port) 18 formed in the shaft center portion, and the upper joint 34 has an upper end of the pressurized tank 12. The funnel portion 12a and the lower end are flanged portions 35 and 37 each having a lower end that can be coupled to the case body 32. A separate orifice pipe 25 is detachably set on the upper side of the inlet 16 of the upper joint 34 to form an orifice (flow rate regulating path) 24. The reason why the orifice tube 25 can be detached is to make it possible to cope with replacement based on flow path wear or change in the flow rate of the granular material. The orifice pipe 25 may be configured such that the orifice is fixedly formed directly on the upper joint 34 by using a liner member, but is normally detachable as described above. As the liner member, wear-resistant cast steel, urethane rubber, or the like can be used.

  The lower joint 36 is a single flange type having a flange portion that can be coupled to the lower end of the case body. The lower joint may also be an “E” -shaped double flange type.

  The valve seat body 26 forms a granular material passage space 27 on the upper end side (inlet side) from the inner peripheral side to the outer peripheral side of the valve seat body 26 and on the lower end side (outlet side) from the outer peripheral side to the inner peripheral side. It is structured. That is, the granular material that has passed through the orifice pipe 25 is caused to flow down from the columnar channel G1 positioned above the valve seat body 26 to the columnar channel G2 positioned below via the annular switching channel 30. .

  In the illustrated example, the outer periphery of the upper and lower ends of the valve seat body 26 is formed as a plurality of engaging column portions 26b and can be held by the upper and lower joints 34 and 36. Here, although the number of the engaging column portions 26b is six in the illustrated example, the number of the column portions can hold the valve seat body 26 and the granular material passes through the granular material. The space 27 is not particularly limited as long as it can be formed, and can be appropriately selected within a range of 3 to 10. Further, the engagement column portion 26b may be closer to the inner side than the outer peripheral portion. For example, it is good also as a structure hold | maintained by the inner side step part of a coupling body.

  Moreover, the valve seat part (outer peripheral surface) 26a of the valve seat body 26 has a drum shape that is curved toward the center height position so that the cylindrical diaphragm valve body 28 can come into surface contact. When the familiarity of the tubular diaphragm type valve element 28 is good, it may be linear.

  The upper and lower ends of the valve body 28 are annular lip portions (saddle portions) 28b, and the inside of the operating portion (valve seat crimping portion) 28a is formed in a curved shape so as to correspond to the valve seat body 26 body. In addition, the curved shape on the outer peripheral side is made gentler than that on the inner peripheral side, and the wall thickness gradually increases toward the center height position. This is because it is easy to ensure the closing pressure of the tubular diaphragm type valve element 28. In this way, a valve body working space 33 formed between the outer periphery of the valve body 28 and the inner periphery of the case body 32 is formed, and the case body 32 has a working fluid supply port 44 connected to the valve body working space 33. Is formed. In the illustrated example, there is one working fluid supply port 44, but a plurality of working fluid supply ports 44 may be provided.

  Here, the valve seat body 26 may be made of metal, but in the case where the weight is reduced and the spray material is easily worn away, it is molded from plastic. When a plastic material is used, it may be polyvinyl chloride (PVC) or the like, but may be a polyurethane resin or ceramic having excellent wear resistance.

  The valve body 28 is made of elastomer and is molded from natural rubber, various synthetic rubbers or thermoplastic elastomer (TPE). For example, examples of the synthetic rubber include nitrile rubber (NBR) and urethane rubber. It may be a punishment with a soft plastic film.

  The upper and lower joints 34 and 36 are formed as annular convex portions 34a and 36a near the center of the opposing surface, and an inner engagement step portion 38 is formed. The annular protrusions 34a and 36b of the upper and lower joint bodies 34 and 36 receive and hold the upper and lower end rail portions of the valve seat body 26 on the inner peripheral side on the inner peripheral side, and are outer engagements formed on the outer peripheral side. The flange portions 28b and 28b at the upper and lower end portions of the valve body 28 are crimped and sandwiched between the joint portion 40 and the inner peripheral surface of the case body.

  In the on-off valve 14 having the above-described configuration, the upper joint 34 is flange-coupled to the funnel portion 12a of the pressurized tank 12 and the lower joint 36 is flange-coupled (screw-coupled) to the mixing joint 46 respectively. And incorporated into an air blasting device. One end of the horizontal portion 46 a of the mixing portion joint 46 is connected to the compressed air supply hose 48, and the other end is connected to a blast hose (powder material transport pipe) 50.

  Next, how to use the above embodiment will be described with reference to FIG.

  First, the check valve 56 between the injection material charging tank 54 and the pressurized tank 12 and the on-off valve 14 of this embodiment connected to the pressurized tank 12 supply pressurized fluid (air) to the valve operating space 42. In this closed state, the check valve 56A between the injection hopper 52 and the propellant supply tank 54 is opened, a predetermined amount of the injection material is stored in the injection material input tank 54, and the check valve 56A is stored. Is closed.

  Next, the check valve 56 between the injection material charging tank 54 and the pressurizing tank 12 is opened to pressurize the injection material charging tank 54 (for example, 0.2 to 0.7 MPa), and the inside of the injection material charging tank 54 The injection material is stored in the pressurized tank 12, and the injection material is waited for injection.

  And when injecting an injection material, while supplying compressed air to the mixing part M with the compressed air supply hose 48, the pressurized fluid in the valve working space 42 is exhausted. Then, the pressure of the on / off valve 14 against the valve seat body 26 is released by the air pressure in the pressurizing tank 12, and the on / off valve 14 is opened, so that the upper and lower columnar channels G1 and G2 and the two columnar channels are opened. And a granular flow path including the annular opening / closing path 30 communicating with each other through the granular material passage spaces 27 and 27 is formed. For this reason, the injection material flows substantially in the direction of gravity, the working air pressure effectively acts, passes through the on-off valve 14 and reaches the compressed air mixing unit M.

  In this way, the injection material is mixed with the compressed air supplied from the compressed air supply hose 48 in the compressed air mixing section M, flows into the blast hose 50, and the injection material is injected from the injection nozzle onto the workpiece.

  The injection amount was compared using each injection material (abrasive material) shown in Table 1 using the on-off valve 114 of the preceding example shown in FIG. 1 and the on-off valve 14 of the example shown in FIG.

  The specifications of each injection material are as follows, and the specifications and injection conditions of each on-off valve are as follows.

Injection material ... A # 24 (ceramic, particle size 0.65mmφ)
A # 80 (ceramic, particle size 0.2mmφ)
A # 180 (ceramic, particle size 0.085mmφ)
GB-AE (glass beads, particle size 0.12mmφ)
SB-3 (steel ball, particle size 0.3mmφ)
Fig. 1 Orifice diameter: 15mmφ, h1: 120mm, h2: 45mm
Mixing part inner diameter: 30mm
Fig. 3: Orifice diameter 15mmφ, h3: 250mm, mixing section inner diameter: 30mm
Injection conditions: pressurized tank internal pressure: 0.3 MPa, compressed air pressure: 0.3 MPa,
Injection time: 69 seconds Table 1 shows the results of the preceding example, and Table 2 shows the results of the examples. The on-off valve of the present embodiment shows a larger flow rate than the previous example even with the same orifice diameter and injection conditions, and the injection amount variation is remarkably small.

It is a schematic sectional drawing which shows an example of the prior art of the opening / closing valve for a granular material supply. 1 is a model cross-sectional view of an overall view of a pressurized air blast device incorporating an on-off valve for supplying an injection material (powder body) according to the present invention. It is detailed sectional drawing of the on-off valve for injection material (powder body) supply which concerns on this invention. FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. It is a disassembled perspective view of the valve body and valve seat body in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Pressurization tank 14 On-off valve 16 Inlet of on-off valve 18 Outlet of on-off valve 20 Valve case 25 Orifice pipe 26 Valve seat body (core)
26a Valve seat part 26b Engagement column part 27 Granule passage space 28 Cylindrical diaphragm type valve body (opening / closing tool)
28a Actuator 30 Annular Open / Closed Path 32 (Valve) Case Body 34 Upper Joint of Valve Case 36 Lower Joint of Valve Case 46 Mixing Joint Fitting M Compressed Air Mixing Part

Claims (8)

An on-off valve used when supplying granular material from a pressurized tank to the granular material transport pipe,
The valve case of the on-off valve has a cylindrical shape with an inlet and an outlet in the vertical direction of the upper and lower parts, and an orifice pipe for quantifying the flow rate of the granular material can be attached to the inlet side. In preparation for
Between the inflow port and the outflow port, a cylindrical valve seat body (core) concentrically held by the valve case, and the entire circumference of the valve seat body concentrically arranged on the outer periphery of the valve seat body An annular opening / closing path is formed with a cylindrical diaphragm type valve body (opening / closing tool) that is crimped to / detached from,
On the upper and lower surface portions of the valve seat body, a granular material passage space in which the inflow port and the outflow port communicate with an annular opening / closing path is formed,
An on-off valve for supplying a granular material. The valve case is formed by the case main body and flange-shaped upper and lower joints arranged above and below the case main body and forming the inlet and the outlet, respectively.
An inner engagement step portion and an outer engagement step portion for holding the valve seat body and the valve body, respectively, are formed on the opposing surfaces of the upper and lower joints,
A plurality of engagement columns for forming the granular material passage space are provided near the upper and lower outer circumferences of the valve seat body, and the engagement column portion is between the inner engagement step portions of the upper and lower joints. Is held between the valve seat body,
A flange is formed on the upper and lower sides of the valve body, and the flange is engaged and clamped between the upper and lower outer circumferences of the case body and the upper and lower joints, and the valve body is detachably held. The on-off valve for supplying granular material according to claim 1.   The valve seat portion of the valve seat body is a reduced diameter curved surface in the height direction, and the operating portion of the valve body is an inner bulging surface corresponding to the valve seat portion. 2. The on-off valve for supplying granular material according to 2.   4. The case main body includes a working fluid supply port that conducts to a valve body working space formed between an outer periphery of the valve body and an inner periphery of the case main body. An on-off valve for supplying granular material according to any one of the above.   A T-shaped mixing part joint provided with a mixing part for feeding compressed air into the lower joint and mixing with the granular material in a horizontal part is connected via the vertical part. Item 5. The on-off valve for supplying granular material according to any one of Items 1 to 4.   The on-off valve for supplying granular material according to claim 5 is connected to a pressurized tank of an air blast device, a compressed air supply hose is connected to one end of a horizontal portion of the mixing joint, and an injection nozzle is connected to the other end. An air blasting device comprising: a blast hose with a connection. A method of supplying the granular material stored in the pressurized tank from the pressurized tank to the granular material supply pipe,
The granular material that has passed through the orifice pipe from the pressurized tank is caused to flow down from the columnar channel located above the valve seat body to the columnar channel located below via the annular opening / closing channel,
A granular material supply method comprising: supplying and stopping the granular material by opening and closing a cylindrical diaphragm type valve body by crimping and detaching from the entire outer peripheral surface of the valve seat body.   An air blasting method comprising performing air blasting by supplying a polishing material (injection material) to a blast hose with an injection nozzle using the powder and particle supply method according to claim 7.

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