JP2006112527A - Pneumatic transport opening/closing valve, pipe switching device, and powder and grain measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic transport opening/closing valve with an abutting member for closeably abutting on the opening port of a pneumatic transport pipe even when deviating from the opening port of the pneumatic transport pipe, the abutting member being free of frictional wear in long-time use to prevent the leakage of powder and grain and gas. <P>SOLUTION: The pneumatic transport opening/closing valve 25 for opening/closing a supply port 78 of a material supply pipe 33 comprises a valve element 6 formed of a metal material for abutting the supply port 78 and a forward/backward movement part 76 connected thereto via a cushion 7 formed of an elastic material and buried in the valve element 6 for moving the valve element 6 forward/backward to make the valve element 6 abut on the supply port 78 during forward movement and to make the valve element 6 apart from the supply port 78 during backward movement. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an on / off valve for pneumatic transportation for opening and closing an opening of an pneumatic transportation pipe for pneumatically transporting a granular material.

Conventionally, foods, pharmaceuticals, resins, ceramics, metal powders, granules, or mixed granulates thereof (hereinafter referred to as “powder granules”) have been used in various fields such as agriculture, medical, and industrial. Used in
As a method for transporting such a granular material, pneumatic transportation is known in which a suction blower is connected to an aerodynamic transportation tube and the granular material is transported by air. The pneumatic transportation pipe used for such pneumatic transportation is provided with an on / off valve for pneumatic transportation for opening and closing the opening of the pneumatic transportation pipe. The on-off valve for pneumatic transportation includes a contact member that advances and retreats with respect to the opening, and the opening is closed when the contact member contacts the opening, and the contact member is separated from the opening. By doing so, the opening is opened. Further, the contact member and the opening are made of a hard metal material.

For example, as an on / off valve for pneumatic transportation of granular materials, a laterally opened inlet, a downwardly opened outlet, a cylindrical casing, a valve seat provided in the casing, and a valve seat can be moved back and forth. The valve seat has three annular contact members, and one of the inner annular contact members is a fixed one. An open / close valve for pneumatic transportation has been proposed in which the remaining annular contact member is movable, and the movable annular contact member is movable by its own elasticity (see, for example, Patent Document 1). ).
Japanese Patent Application Laid-Open No. 2002-89721

However, when the contact member is displaced from the opening, if the contact member is made to contact the opening, the conventional contact member is made of a hard metal material. At the time of advancement, there is a gap between the contact member and the opening, and the contact member cannot be brought into close contact with the opening, so that there is a problem that powder particles and gas leak from the gap. .
In addition, since the valve seat has an elastic annular contact member, the on-off valve for pneumatic transportation of a granular material described in Patent Document 1 is elastic even when the valve body is displaced and contacted with the annular contact member. Therefore, it is possible to prevent a gap from occurring. However, since the annular contact member is made of an elastic material, it is inferior in durability compared to a hard metal, and is easily worn by long-term use, and a gap is generated between the valve body and the annular contact member. There arises a problem that the valve body cannot be brought into close contact with the annular contact member.

  Therefore, an object of the present invention is to allow the contact member to contact the open port of the pneumatic transport tube in a closed manner even when the contact member is displaced from the open port of the pneumatic transport tube. An aerodynamic transport on / off valve capable of preventing leakage of a granular material or gas without wear of the contact member due to friction, a pipe switching device provided with the pneumatic transport on / off valve, and the pipe switching device An object of the present invention is to provide a granular material measuring device.

  The on-off valve for pneumatic transportation according to the present invention is an abutting member made of a metal material that comes into contact with the opening in the on-off valve for pneumatic transportation for opening and closing an opening of an air transportation pipe for pneumatically transporting a granular material. Advancing / retreating means for advancing / retreating the abutting member to bring the abutting member into contact with the open port during advancement and to separate the contact member from the open port during retraction, the abutting member, And a connecting means made of an elastic material for connecting the advancing / retreating means.

  According to this configuration, if the abutting member is brought into contact with the opening at the time of advancement, the abutting member can close the opening. Open mouth can be opened. In such an opening / closing operation, when the contact member is displaced to contact with the opening, the connecting means made of an elastic material is released from the contact member by the pressure when the contact member contacts the opening. Since the contact means is elastically deformed so as to go to the opening so as to fill the gap between the opening, the gap can be closed and the opening can be closed by the contact means. In addition, since the contact member is made of a metal material, wear of the opening and the contact member can be reduced even when the contact member repeatedly contacts and separates from the opening during long-term use. Durability can be improved.

In the pneumatic transportation on-off valve of the present invention, it is preferable that the connecting means is embedded in the contact member.
According to this configuration, since the connecting means is embedded in the abutting member, the connecting means can reliably connect the abutting member and the advancing and retracting means. The gap can be reliably closed and the opening can be closed by the contact means.

In the pneumatic transport on-off valve according to the present invention, it is preferable that the contact member is formed in a substantially conical shape whose cross-sectional area gradually increases in the retracting direction in the advancing / retreating direction.
According to this configuration, if the abutting member abuts on the opening, it is possible to reliably bring the abutting means into contact with the opening and close the opening.
Moreover, the piping switching apparatus of this invention is provided in multiple numbers corresponding to the several pneumatic transport pipe | tube for pneumatically transporting a granular material, and the several said pneumatic transportation pipe | tube. A plurality of aerodynamic transportation on / off valves, and each of the aerodynamic transportation on / off valves is selectively brought into contact with and separated from each of the aerodynamic transportation pipes corresponding to each of the aerodynamic transportation on / off valves. It is characterized in that the tube can be selectively opened and closed.

According to this configuration, since the pneumatic switching opening / closing valve is provided in the pipe switching device, each pneumatic transportation pipe can be opened / closed selectively and reliably, and a plurality of powder particles can be selectively / reliably selected. Can be transported by force.
Moreover, the granular material measuring device of this invention is for measuring the granular material selectively supplied from the pneumatic switching pipe | tube opened and closed by the piping switching device of Claim 4, and the said piping switching device. And a measuring unit.

  According to this structure, since the granular material selectively supplied from the opened and closed pneumatic transport pipe is measured, a plurality of granular materials can be selectively and reliably measured.

According to the first aspect of the present invention, it is possible to achieve pneumatic transportation of a granular material or a granular material free from gas leakage over a long period of time with a simple configuration.
According to the second aspect of the present invention, reliable pneumatic transportation of the granular material can be achieved with a simple configuration.
According to the third aspect of the present invention, it is possible to achieve more reliable pneumatic transportation of the granular material with a simple configuration.

According to invention of Claim 4, a several granular material can be selectively and reliably pneumatically transported.
According to the invention described in claim 5, it is possible to selectively and reliably weigh a plurality of powder particles.

  FIG. 1 is a front view of a raw material measuring apparatus which is an embodiment of the powder and particle measuring apparatus of the present invention, FIG. 2 is a right sectional view of an essential part thereof, FIG. FIG. 5 is a front view thereof, FIG. 6 is an exploded view of the pneumatic transportation on-off valve shown in FIG. 4, and FIG. 7 is a main part side of the material switching unit shown in FIG. 8 is an exploded perspective view of an air intake portion provided in the raw material supply pipe shown in FIG.

In FIG. 1, the raw material measuring device 1 includes a raw material switching unit 3 as a pipe switching device and a measuring unit 2.
As shown in FIG. 7, the raw material switching unit 3 includes a casing 19, a raw material supply pipe 33 as a pneumatic transport pipe and a pneumatic transport supply pipe, and a pneumatic transport on-off valve 25.
As shown in FIG. 5, the casing 19 has a substantially pyramid box shape in which an upper part is opened and an opening cross-sectional area decreases downward, and as shown in FIGS. 4 and 7, the upper part of one side wall 44 thereof. A plurality of (four) side openings 5 are formed in a substantially circular shape with a predetermined interval therebetween. In addition, as shown in FIG. 7, a lower port 30 that is opened in a substantially circular shape is formed in the lower portion of the other side wall 45 that is disposed opposite to the side wall 44 opposite to the one side wall 44 of the casing 19. The upstream end of a secondary suction pipe 35 to be described later is connected to the lower port 30. An upper lid 31 is provided at the upper opening of the casing 19 so as to cover the opening. In addition, as shown in FIGS. 4 and 5, the upper lid 31 is formed with an upper opening 46 at a central portion in plan view, and an upper pipe 47 (usually closed) is connected to the upper opening 46. .

  As shown in FIG. 7, the raw material supply pipe 33 is substantially L-shaped in a side view, and the vertical pipe part 21 arranged in the vertical direction so that the transport direction of the raw material is upward, and the vertical pipe part 21 The downstream side (the downstream side in the raw material transport direction, hereinafter, “downstream side” and “upstream side” are based on the raw material transport direction) and the curved pipe portion 32 that curves in the horizontal direction from the end. Is prepared. Note that the vertical pipe portion 21 is provided with an air intake portion 22 which will be described in detail later. As shown in FIG. 4, the raw material supply pipe 33 is provided corresponding to each side port 5, and the downstream end of the curved tube portion 32 of each raw material supply pipe 33 is connected to each side port 5. And a supply port 78 as an open port at the downstream end thereof is arranged so as to face the casing 19. Further, the upstream end of the vertical pipe portion 21 of each raw material supply pipe 33 is connected to each raw material tank (not shown) via each flexible hose (not shown). In addition, the raw material tank is provided corresponding to each raw material supply pipe 33, and the raw material which consists of a different kind of granular material is suitably stored according to the objective and use, for example, a main material, a coloring agent, etc. (M / B), a pulverizing agent, a dispersing agent and the like are stored in each raw material tank.

  As shown in FIGS. 4 and 7, the pneumatic transport on-off valve 25 is in the opposite direction to the supply port 78 of the curved tube portion 32 connected to the side port 5 at the upper portion of the other side wall 45 of the casing 19. A plurality (four) are provided so as to face each other. As will be described later in detail, each pneumatic transport on-off valve 25 includes a piston 9 and a valve body 6, and the valve body 9 is brought into contact with the corresponding supply ports 78 by driving the piston 9 forward and backward. Each supply port 78 is opened and closed by separating them. Each pneumatic transport on-off valve 25 is connected to a corresponding compressed air line (not shown), and is driven forward and backward by the air pressure supplied by the compressed air line. By the advance / retreat of the piston 9, the raw material switching unit 3 selectively opens the supply ports 78 by closing one of the supply ports 78 and closing the remaining supply ports 78. Switching. More specifically, in the raw material switching unit 3, among the plurality of supply ports 78, the supply port 78 corresponding to the raw material to be supplied is retracted in the pneumatic transport on / off valve 25 corresponding to the supply port 78. By separating the valve body 6 from the supply port 78, the supply port 78 is opened, while the other remaining supply port 78 is advanced to the piston 9 in the corresponding pneumatic transport pipe 25 to move the valve body 6. By closing the supply port 78 by bringing it into contact with the supply port 78, only the raw material to be supplied is selectively connected to the supply port 78 from the raw material supply pipe 33 corresponding to the raw material to be supplied. In this way, it is supplied into the casing 19.

As shown in FIG. 2, the measuring unit 2 includes a measuring hopper unit 20, a cushion tank 11, and an additive supply unit 37.
The weighing hopper unit 20 includes a weighing hopper 38 and a load cell 14.
As shown in FIGS. 1 and 3, a secondary suction port 62 is formed in the center of the plan view at the upper portion of the weighing hopper 38, and the downstream end of the secondary suction tube 35 is formed in the secondary suction port 62. Are connected to the lower opening 30 of the casing 19 through the secondary suction pipe 35. In addition, a primary suction port 61 is formed at an upper portion of the weighing hopper 38 at an interval in the radial direction of the secondary suction port 62, and the primary suction tube 59 is connected to the primary suction port 61. The upstream end is connected. A suction blower (not shown) is connected to the downstream end of the primary suction pipe 59, and this suction blower is connected to the primary suction of the weighing hopper 38 via the primary suction pipe 59. It is connected to the mouth 61. Further, as shown in FIG. 1, a mixed material discharge pipe 64 is formed at the lower part of the weighing hopper 38 and is connected to a cushion tank 11 described later. Further, a damper 63 for opening and closing the mixed material discharge pipe 64 is provided at the lower end portion of the mixed material discharge pipe 64.

  When the suction blower is driven, as shown in FIG. 1, as described above, the raw material selectively fed in the raw material switching unit 3 is pneumatically transported to the weighing hopper 38 via the secondary suction pipe 35. Is done. That is, when the suction blower is driven, the primary side suction pipe 59, the weighing hopper 38, the secondary side suction pipe 35, the casing 19, the raw material supply pipe 33 (see FIG. 2) selected by the pneumatic transport on-off valve 25, and Via a flexible hose (not shown), the inside of a raw material tank (not shown) for storing the raw material to be selectively supplied is sucked, and the raw material is pneumatically transported to the weighing hopper 38. The air that has transported the raw material to the weighing hopper 38 is exhausted from the suction blower via the primary suction pipe 59 after being separated from the raw material in the weighing hopper 38 as shown in FIG.

As shown in FIG. 1, the load cell 14 is arranged on the side of the weighing hopper 38 and measures the weight of the weighing hopper 38 while supporting the weighing hopper 38. The weight of the raw material supplied to the weighing hopper 38 is measured by the load cell 14 in a state where the weight of the weighing hopper 38, that is, the weight of the tare is canceled.
The cushion tank 11 is disposed below the weighing hopper 38, and a mixed raw material discharge pipe 64 is connected to the upper portion of the cushion tank 11, and is connected to the weighing hopper 38 via the mixed raw material discharge pipe 64. A raw material transport outlet 39 is formed in the lower part of the cushion tank 11, and a flexible hose 48 is connected to the raw material transport outlet 39. In addition, a level meter 74 is provided in the lower part of the cushion tank 11. The cushion tank 11 stores the raw material dropped from the mixed raw material discharge pipe 64 of the weighing hopper 38 and the additive supplied from the additive supply unit 37 described later.

  In the weighing hopper unit 20, the suction blower is driven in a state where the damper 63 of the mixed material discharge pipe 64 is closed, and the raw material to be supplied from the raw material switching unit 3 is supplied via the secondary suction pipe 35. The weighing hopper 38 is pneumatically transported, and the weight of the raw material is measured by the load cell 14 in the weighing hopper 38. When the load cell 14 weighs a predetermined amount of raw material set in advance, in the raw material switching unit 3, the raw material supply pipe 33 that supplies the raw material closes the corresponding pneumatic transport on-off valve 25. Stop supplying raw materials. Accordingly, the accurate weight of the raw material is measured by the load cell 14. Next, in the raw material switching unit 3, the raw material supply pipe 33 to be newly supplied is opened by the corresponding pneumatic transport on-off valve 25, and the raw material is supplied to switch the raw material. The weighing hopper unit 20 measures the raw material selectively supplied from the opened / closed raw material supply pipe 33. By repeating such material switching and metering operations, all the materials are integrated and weighed. Next, the damper 63 is opened, and the raw material of the weighing hopper 38 is dropped into the cushion tank 11. When the dropping of the raw material is completed, the damper 63 is closed again.

As shown in FIG. 2, the additive supply unit 37 is arranged below the additive supply hopper 40 for supplying the additive to be added to the raw material, and the additive is stored below the additive supply hopper 40. A storage hopper 41 and a load cell 79 are provided.
An upper end portion of the additive discharge pipe 66 is connected to the lower portion of the additive supply hopper 40, and a lower end portion of the additive discharge pipe 66 is connected to the upper portion of the additive storage hopper 41. A damper 65 for opening and closing the additive discharge pipe 66 is provided in the middle of the additive discharge pipe 66.

A screw feeder 42 for cutting the raw material in the additive storage hopper 41 into the cushion tank 11 is provided below the additive storage hopper 41. The screw feeder 42 is connected to the upper side wall of the cushion tank 11.
The load cell 79 is disposed below the additive storage hopper 41 and subtracts and measures the weight of the raw material supplied from the additive storage hopper 41.

  Then, in the additive supply unit 37, the additive stored in the additive storage hopper 41 is dropped by a predetermined amount into the additive storage hopper 41 by opening and closing the damper 65, and then in the additive storage hopper 41. By driving the screw feeder 42, the supply of the raw material by the screw feeder 42 is measured (reduced metering) by the load cell 79, and the additive is cut out and supplied into the cushion tank 11. As a result, an accurate amount of additive is supplied to the cushion tank 11.

Then, as described above, after the correct amount of raw materials and additives are supplied to the cushion tank 11, the mixture of raw materials and additives is formed, for example, from the raw material transport outlet 39 via the flexible hose 48. Supplied to hoppers.
Next, the pneumatic transport on-off valve 25 will be described in detail with reference to FIGS.
In FIG. 6, the pneumatic transport on-off valve 25 includes a valve body 6 as a contact member, a connecting portion 75, and an advance / retreat portion 76 as advance / retreat means.

The valve body 6 is made of a metal material, and in the forward / backward direction of the cylinder 9, the sectional area gradually increases in the retracting direction of the cylinder 9 (hereinafter, the retracting direction is “backward” and the advancing direction is “frontward”). It is formed in a substantially truncated cone shape that increases. The valve body 6 is formed with a valve body recess 50 that is recessed in a substantially cylindrical shape from the rear surface of the valve body 6 toward the front inside.
The connecting portion 75 includes a cushion 7 as connecting means, a bolt 8, a screwing washer 15, a first nut 16, and a second nut 17.

The cushion 7 is made of an elastic material such as polyurethane elastomer, penetrates in the front-rear direction of the cushion 7, and has a substantially cylindrical insertion port 67 into which a small-diameter shaft portion 55 of a bolt 8 described later is inserted. A cushion recess 52 that is recessed in a dish shape is formed.
The bolt 8 is made of a metal material, and has a substantially cylindrical small-diameter shaft portion 55 on the front side, and a rear side of the small-diameter shaft portion 55 and a large diameter of a substantially cylindrical shape having a diameter larger than the diameter of the small-diameter shaft portion 55. The shaft portion 53 is formed. The large-diameter shaft portion 53 is formed with a large-diameter shaft recess 54 that is recessed in a substantially cylindrical shape from the rear surface of the large-diameter shaft portion 53. Further, threads are formed on the peripheral surface of the front end portion of the small-diameter shaft portion 55, the entire peripheral surface of the large-diameter shaft portion 53, and the inner peripheral surface of the large-diameter shaft recess portion 54, respectively, and screw washers described later. 15 and an inner peripheral surface of a first nut 16 described later, and a thread formed on a peripheral surface of a front end portion of a piston 9 described later.

The screw washer 15 is made of a metal material, and has an inner diameter formed in a ring shape corresponding to the diameter of the small-diameter shaft portion 55.
The first nut 16 is made of a metal material, and the inner diameter thereof is formed in a ring shape corresponding to the diameter of the large-diameter shaft portion 53.
The second nut 17 is made of a metal material, and has an inner diameter formed in a ring shape corresponding to a diameter of a piston 9 described later.

The advance / retreat portion 76 includes a piston 9 and a cylinder 10.
In the piston 9, a piston screwing portion 68 for screwing the bolt 8 is formed at the front end portion of the piston 9.
The cylinder 10 has a cylindrical shape, and supports the piston 9 so as to be able to advance and retract by operating the air pressure of a compressed air line (not shown).

Next, the assembly of the pneumatic transport on-off valve 25 will be described in detail.
First, as shown in FIG. 6, the threaded washer 15 is fitted into the cushion recess 52 of the cushion 7 from the front, and then the small-diameter shaft portion 55 of the bolt 8 is inserted into the insertion port 67 of the cushion 7 from the rear. Then, it is screwed onto the screwing washer 15 already fitted to the cushion 7, and then the valve body recess 50 of the valve body 6 is deeply fitted into the cushion 7 from the front and buried, and then the bolt The first nut 16 is screwed onto the large-diameter shaft portion 53 of 8 from behind. When the first nut 16 is tightened, the cushion 7 is compressed between the screw washer 15 and the first nut 16 and bulges in the radial direction. Next, the large-diameter shaft concave portion 54 of the bolt 8 is screwed into the piston screwed portion 68 of the piston 9 in which the second nut 17 is screwed deeply backward.

Thereby, the valve body 6 and the advance / retreat part 76 are connected via the connection part 75.
In such a pneumatic transport on-off valve 25, when the valve body 6 is brought into contact with the supply port 78 at the time of advancement, the valve body 6 can close the supply port 78, and at the time of retraction, the valve body 6 from the supply port 78 can be closed. The valve body 6 can open the supply port 78. In such an opening / closing operation, when the valve body 6 comes into contact with the supply port 78 in a shifted manner, the cushion 7 made of an elastic material is caused by the pressure when the valve body 6 comes into contact with the supply port 78. Since the valve body 6 is elastically deformed so as to face the supply port 78 so as to fill a gap between the supply port 78 and the supply port 78, the gap can be closed, and the supply port 78 is closed by the valve body 6. be able to. Further, since the valve body 6 is made of a metal material, wear of the supply port 78 and the valve body 6 can be reduced even when the valve body 6 repeatedly contacts and separates from the supply port 78 in long-term use. And durability can be improved.

Further, in such a pneumatic transport on-off valve 25, since the cushion 7 is embedded in the valve body 6, the cushion 7 can reliably connect the valve body 6 and the cushion 7, while the valve body 6 is connected to the supply port. If it comes into contact with 78, the gap can be reliably closed by its elasticity, and the supply port 78 can be closed by the valve body 6.
Further, in such a pneumatic transport on-off valve 25, the valve body 6 is formed in a substantially truncated cone shape whose cross-sectional area gradually increases toward the rear, so that the valve body 6 abuts on the supply port 78. The valve body 6 can be reliably brought into contact with the supply port 78 and the supply port 78 can be closed.

In addition, the raw material switching unit 2 is provided with the above-described pneumatic transportation on-off valve 25, so that each raw material supply pipe 33 can be selectively opened and closed, and a plurality of raw materials can be selectively and It can be transported reliably.
Moreover, since such a raw material measuring device 1 measures the raw material selectively supplied from the opened and closed raw material supply pipe | tube 33, it can selectively measure a some raw material selectively.

Next, the air intake unit 22 will be described in detail with reference to FIGS. 7 and 8.
As shown in FIG. 7, the air intake portion 22 is disposed at the upstream end of the vertical tube portion 21, that is, at the lower end portion of the vertical tube portion 21. As shown in FIG. 8, the air intake portion 22 is formed with an air intake 70 for taking air into the vertical pipe portion 21, and the air amount adjustment for adjusting the mesh filter 23 and the amount of air taken in. An air amount regulator 24 is provided as a means.

The air inlet 70 has a substantially circular shape when viewed from the front, and its diameter is 0.65 to 0.95 times the diameter of the vertical pipe portion 21, more specifically 25 to 36 mm.
The mesh filter 23 is fixed to the raw material supply pipe 33 with bolts or the like so as to cover the air intake port 70. The mesh filter 23 has a substantially rectangular mesh when viewed from the front. The mesh filter 23 has a mesh opening of 0.25 to 1 .5 so that the raw material that is pneumatically transported in the raw material supply pipe 33 does not flow out of the air intake port 70. It is 41 mm.

  The air amount adjuster 24 has a horseshoe shape made of a metal material, and is disposed in the vertical pipe portion 21 so that the air intake 70 can be closed. The air amount adjuster 24 has a cross-sectional arc shape whose diameter is slightly smaller than the diameter of the vertical pipe portion 21 so as to come into pressure contact with the vertical pipe portion 21, and an air inlet 70 in the raw material supply pipe 33 is formed. It is attached so as to cover the air intake port 70 in the portion that is formed and to be rotatable in the circumferential direction. In addition, the air amount adjuster 24 is formed with an open portion 72 cut out long between both ends in the circumferential direction of the arc. The opening 72 has a circumferential length set so that the air intake 70 is fully opened when the air amount adjuster 24 is rotated so that the air intake 70 and the opening 72 overlap. ing.

  In the air intake unit 22, when the air amount adjuster 24 is rotated in the circumferential direction with respect to the raw material supply pipe 33 so that the air amount adjuster 24 and the air intake port 70 overlap, the air is taken in. When the air amount regulator 24 is rotated in the circumferential direction with respect to the raw material supply pipe 33 so as not to be taken into the raw material supply pipe 33 from the inlet 70 and the opening 72 and the air inlet 70 overlap (fully opened state). In addition, air (secondary air) is taken into the raw material supply pipe 33 from the air intake 70. The amount of air taken into the raw material supply pipe 33 can be adjusted by rotating the air amount adjuster 24 in the circumferential direction and adjusting the opening of the air intake 70.

  In the pneumatic transportation of the raw material from each raw material tank, a suction blower (not shown) is driven, and air (primary) is formed from the air intake port formed at the upstream end of the flexible hose connected to the raw material tank. Air) is taken in, and the raw material stored in the raw material tank is pneumatically transported by the air. On the other hand, the aerodynamic force tends to be non-uniform as it goes toward the downstream end of the flexible hose, and therefore, the raw material is hardly dispersed uniformly. Therefore, it reaches the raw material supply pipe 33 and is easily clogged.

  However, in this raw material supply pipe 33, even if a raw material in which the dispersion state is poor due to non-uniform aerodynamic force flows into the raw material supply pipe 33 from the flexible hose, it is formed in the raw material supply pipe 33. By the aerodynamic force of the air (secondary air) newly taken in from the existing air intake port 70, the dispersion state of the raw material can be improved on the downstream side of the air intake port 70, and the raw material can be reliably pneumatically transported. Therefore, with a simple configuration, the raw material can be satisfactorily supplied from the supply port 78 while preventing the raw material from being blocked.

  In particular, in the raw material supply pipe 33, the vertical pipe 21 is subjected to a gravity load downward in the vertical direction opposite to the upward transport direction in the vertical pipe portion 21, so that the air flowing upward in the vertical direction is likely to be uneven, Although the raw material is in a poorly dispersed state, the raw material is more likely to be clogged. However, when air is taken in from the air intake 70 formed at the lower end of the vertical pipe portion 21, the downstream of the air intake 70 is obtained. On the side, i.e., above, the aerodynamic force of the air taken in reduces the gravity load on the raw material and transports the raw material, so that the dispersed state of the raw material is improved and the raw material is supplied from the supply port 78 well. be able to.

Further, in this raw material supply pipe 33, since the air amount regulator 24 for adjusting the amount of air taken in by the air intake port 70 is provided, depending on the amount and speed of the raw material to be pneumatically transported, An optimal air intake can be selected and an efficient supply can be achieved.
Moreover, since this granular material measuring device 1 is equipped with the raw material supply pipe | tube 33 and the measurement part 2 for measuring the raw material supplied from the raw material supply pipe | tube 33, a raw material supply pipe | tube 33 stabilizes a raw material. Thus, the raw material can be reliably measured in the measuring unit 2.

In the above description, the valve body 6 is formed in a substantially truncated cone shape. However, the valve body 6 is not limited to the above, and may have a substantially cone shape.
In the above description, the air inlet 70 is described as being formed at the upstream end of the vertical pipe portion 21, but is not limited to the above, and is particularly limited as long as it is formed in the vertical pipe portion 21. Further, it may be formed in the bending tube portion 32.

Further, as shown in FIG. 7, one air intake port 70 is disposed, but the number thereof is not particularly limited, and a plurality of air intake ports 70 may be disposed.
Furthermore, the raw material is, for example, a powder, granule such as a food, a pharmaceutical, a resin, a ceramic, a metal or other powder, a granule, or a mixed granule thereof, and the kind thereof is not particularly limited.
In addition, the space between the air intake port for taking in the primary air (not shown) and the air intake port 70 for taking in the secondary air is 1 m or more, preferably 2 to 5 m, and the air intake port 70 and the supply port for taking in the secondary air. The effect described above is particularly exerted when the distance between the gap 78 and the gap is within 500 mm.

FIG. 1 is a front view of a raw material measuring apparatus which is an embodiment of the granular material measuring apparatus of the present invention. FIG. 2 is a right side cross-sectional view of the main part of the raw material weighing apparatus shown in FIG. FIG. 3 is a plan cross-sectional view of the main part of the raw material weighing apparatus shown in FIG. 4 is a cross-sectional plan view of the raw material switching unit shown in FIG. FIG. 5 is a front view of the raw material switching unit shown in FIG. FIG. 6 is an exploded view of the on / off valve for pneumatic transportation shown in FIG. 7 is a cross-sectional side view of a main part of the raw material switching unit shown in FIG. FIG. 8 is an exploded perspective view of an air intake portion provided in the raw material supply pipe shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw material measuring device 2 Measuring part 3 Raw material switching part 6 Valve body 7 Cushion 25 Opening / closing valve 33 for pneumatic transportation Raw material supply pipe 76 Advancement / retraction part 78 Supply port

Claims (5)

In the pneumatic transport on-off valve for opening and closing the opening of the pneumatic transportation pipe for pneumatic transportation of the granular material,
A contact member made of a metal material that contacts the opening;
Advancing / retreating means for advancing and retracting the abutting member to bring the abutting member into contact with the opening when advancing and to separate the abutting member from the opening when retracting;
An on / off valve for pneumatic transportation, comprising a connecting means made of an elastic material for connecting the abutting member and the advancing / retreating means.   The pneumatic connecting on-off valve according to claim 1, wherein the connecting means is embedded in the contact member.   The pneumatic contact on-off valve according to claim 1 or 2, wherein the contact member is formed in a substantially conical shape whose cross-sectional area gradually increases in the retracting direction in the advancing / retreating direction. A plurality of pneumatic transport pipes for pneumatically transporting the powder particles;
A plurality of pneumatic transportation on-off valves according to any one of claims 1 to 3, wherein a plurality of pneumatic transportation pipes are provided corresponding to the plurality of pneumatic transportation pipes;
A plurality of pneumatic transportation pipes can be selectively opened and closed by selectively bringing each pneumatic transportation opening / closing valve into and out of contact with each of the pneumatic transportation pipes corresponding to each of the pneumatic transportation opening / closing valves. A pipe switching device. A pipe switching device according to claim 4;
A granular material measuring device comprising: a measuring unit for measuring the granular material selectively supplied from the pneumatic transport pipe opened and closed by the pipe switching device.

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