JPH07102891B2 - Suction-type pneumatic transportation method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention transports powdered or granular materials such as synthetic resin materials, pharmaceutical materials, processed food materials, etc. from a material storage section to a destination hopper by aspiration air force. The present invention relates to a method and an apparatus therefor, and more specifically, to improvement of opening and closing of a material outlet of a destination hopper and removal of dust adhering to a filter.

(Prior Art) Conventionally, in this type of suction type air transportation method and device, (a) a suction air source, a transportation destination hopper, a transportation pipe and an intake pipe are provided, and A double-acting air cylinder in which the piston rod is retracted and retracted by the air pressure of a dedicated air source provided separately from the suctioned air source is provided, and the material outlet of the destination hopper is operated by the retracting operation of the open / close valve attached to the tip of this air cylinder. It is known to open and close.

(B) The dust adhering to the filter installed inside the transportation destination hopper (often provided on the upper part of the hopper) is removed by the air from a dedicated air source other than the suction air source. Are known.

(Problems to be Solved by the Invention) However, according to the conventional example (a), a dedicated air source is required in addition to the suction air source as a drive source for retracting the piston rod of the air cylinder. In addition, there is a problem that a dedicated pipe is required from the air source to the air cylinder air supply port.

In the case of the conventional example (b), as in the case of the above-mentioned (a), there is a problem that an air source dedicated to the dust removal of the filter is required and the piping becomes complicated.

Further, in these conventional examples, tubes are respectively connected to two air inlets for retracting and retracting the piston rods for opening / closing valves, and the tubes are arranged in the transportation destination hopper. Therefore, in the transportation destination hopper, Depending on the material transported to the tube, the tube may become dirty or adhered and must be cleaned at all times, which is troublesome, and if cleaning is insufficient, there are drawbacks such as deterioration in quality depending on the physical properties of the material. .

The present invention is intended to solve these problems by effectively utilizing the discharge air of the suction air source.

(Means for Solving Problems) As means for achieving the above object, in the suction type air transportation method according to the first aspect of the invention, suction air from a suction air source is acted on a transportation destination hopper via an intake / exhaust pipe. And a transportation step of transporting the material to the destination hopper by the suction air force of the suction air source, and opening and closing the material outlet opening / closing valve of the destination hopper through the part of the intake / exhaust pipe for the discharge air of the suction air source. The method includes a valve opening / closing step and a filter dust removing step of removing dust adhering to the filter installed in the destination hopper by the discharge air passing through a part of the intake / exhaust pipe, and the valve opening / closing step and / or the filter dust removing step is performed as described above. It is characterized in that it is carried out while the transportation process is not performed.

The suction type pneumatic transportation device according to the second aspect of the present invention is for carrying out the method of the first aspect of the invention, and has a destination hopper having an opening / closing valve that opens and closes a material outlet, and the destination hopper. A suction pipe and a suction pipe connected to one end of the suction pipe, and an intake side switching valve on the intake side and a discharge side switching valve on the discharge side of the suction air source. A discharge pipe is connected, the tip of the discharge pipe is connected to the intake / exhaust pipe, and an intake / exhaust switching valve is provided on the transportation destination hopper side of the intake / exhaust pipe. Is connected to the air introduction pipe for the air cylinder that communicates with the air communication path of the air cylinder that is driven by the discharge air of the suction air source, and / or is used for removing dust adhering to the filter installed in the destination hopper. And it is characterized in that formed by connecting the air inlet tube for the said air suction and discharge switching valve.

(Operation) According to the first aspect of the present invention, the transportation step of transporting the material in the material storage section into the transportation destination hopper by the suction air force of the suction air source through the intake and exhaust pipes, and the discharge on the discharge side of the suction air source. The material outlet is closed by an on-off valve by the air pressure of air,
After a predetermined amount of material is filled in the destination hopper, the air opening and closing process of opening the material outlet of the destination hopper at the on-off valve by the discharge air of the suction air source, and attaching to the filter installed inside the destination hopper The method includes a filter dust removing step of removing the dust produced by the discharge air. The valve opening / closing step and / or the filter dust removing step should be performed while the transportation step is not performed,
The valve opening / closing step and / or the filter dust removing step uses the suction air source and the intake / exhaust pipe that are common to the transportation step, and efficiently uses the discharge air and the suction air of the suction air source.

According to the second invention for carrying out the method of the first invention,
Close the intake side switching valve, open the discharge pipe line of the discharge side switching valve, open the intake and exhaust switching valve only for the air cylinder air introduction pipe line, and open the piston rod operation switching valve. When switching to close the valve (part of the valve opening / closing process) and operating the suction air source, the discharge air of the suction air source passes through the discharge pipe, the intake / exhaust pipe, and the air introduction pipe for the air cylinder, and the immersion air conduction path of the air cylinder. And the on-off valve closes the material outlet of the destination hopper.

Therefore, the intake / exhaust switching valve is switched to open only the conduit of the intake / exhaust pipe, the intake side switching valve is switched to open, and the discharge side switching valve is closed to block the conduit of the discharge pipe and discharge air is discharged to the atmosphere. Open to the outside, the suction air from the suction air source is discharged to the outside of the system through the suction / exhaust pipe and suction air source, and the suction air sucks the material in the material storage unit to the transport destination hopper through the transport pipeline. Transported (transportation process). The closed state of the on-off valve during suction transportation of this material utilizes the force that the suction air of the suction air source keeps the inside of the destination hopper at a negative pressure, and the check valve to be described later reverses the flow of air. Is prevented.

When the destination hopper is filled with a predetermined amount of material, the intake / exhaust switching valve is switched to open to the air cylinder air introduction pipe side, the intake side switching valve is closed, and the intake / exhaust switching valve is opened. The discharge air of the source is sent to the protruding air conduction path of the air cylinder through the discharge pipe, the intake / exhaust pipe, and the air introduction pipe for the air cylinder to open the opening / closing valve from the material outlet (part of the valve opening / closing process), The material in the destination hopper is discharged to the outside of the system.

Further, for example, when the material in the transportation destination hopper is discharged (preferably at the same time as or before or after this step), the intake / exhaust switching valve is switched to blow off the discharge air of the suction air source. It is also sent to the air introduction pipe for use (or only this), and the dust adhering to the filter inside the destination hopper is removed (filter dust removal process).

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

S is a suction type air transportation device, and is a filter 2 for separating the granular material (material) to be transported from the transportation air.
Destination hopper 1 in which is installed, a transport pipe 5 connected to the material inlet 3 of the destination hopper 1, a suction air source 7 such as a vacuum pump is connected to one end, and the other end is connected to the destination hopper 1
And an intake / exhaust pipe 6 connected to an upper position of the filter 2, and the suction air force of the suction air source 7 causes a tank,
The material in the material storage unit 8 such as a silo is sucked and transported to the destination hopper 1 through the transportation pipe 5.

The destination hopper 1 comprises a tubular hopper body 1a and a hopper lid 1b (see FIG. 2). Hopper body 1a
A funnel-shaped material outlet 4 is formed in the inner lower part of the. Further, a cylinder solid member 20 is laid horizontally on the upper part of the hopper body 1a, and this cylinder fixing member 20 is inserted into an insertion hole 21a formed in the head of a double-acting air cylinder 21 to remove the air. Cylinder 21 is suspended. An on-off valve 9 is attached to the tip of the piston rod 22 of the air cylinder 21, and the on-off valve 9 is moved to the material outlet 4 via the air cylinder 21 by the discharge air force of a suction air source 7 described later. It is designed to open and close. 10 is a valve seat.

In the cylinder tube 23 of the air cylinder 21,
As shown in FIG. 4, the discharge air of the suctioned air source 7 moves the flange 22a of the piston rod 22 up and down, and the projecting air passage 24 for projecting the piston rod 22 and the piston rod 22 are retracted. Immersion air conduit 25 for
Are formed in the longitudinal direction.

On the other hand, as shown in FIG. 5, the cylinder fixing member 20 is provided with a protruding air passage 26 communicating with the protruding air passage 24 of the air cylinder 21 and an immersion air passage 27 communicating with the immersion air passage 25. The projecting air passage 26 and the submerged air passage 27 are connected to the air cylinder air introduction pipe 40 (see FIG. 1).

As shown in FIG. 3, the hopper lid 1b is fixed to the hopper main body 1a by hooks 11 and the like, and the filter 2 shown in FIG. Is provided with a blow-off member 12, and this blow-off member 12 is attached to the tip of the piston rod 18 of the air cylinder 17, and an air introduction hole (not shown) of the air cylinder 17 is connected to the blow-off air introduction pipe 13 in communication therewith. There is.

As shown in FIG. 5, annular air grooves 26a and 27a are formed at the tips of the protruding air passage 28 and the submerged air passage 27 of the cylinder fixing member 20, and the air cylinder
Discharge air is supplied to the protruding air communication path 24 or the submerged air communication path 25 of 17.

28 are fitted to the adjacent portions of the air grooves 26a and 27a to prevent air leakage from the air grooves 26a and 27a.

Further, as shown in FIG. 4, the tip of the rod cover 29 of the cylinder tube 23 of the air cylinder 21 is further covered with a cover having a length longer than the retracting stroke length of the piston rod 22.
30 is provided, and the packing 31 is provided above the cover 30, so that the material attached to the tip of the piston rod 22 will not wear or damage the packing 31.

Further, as described above, the discharge pipe 15 is connected to the discharge port 7a of the suction air source 7 via the discharge side switching valve 14, and the tip of the discharge pipe 15 is connected to the intake / exhaust pipe 6 on the suction air source 7 side. Connecting.

Further, an intake / exhaust switching valve 41 is attached to the destination hopper 1 side (upper side in the embodiment shown in FIG. 1) of the intake / exhaust pipe 6, and this intake / exhaust switching valve 41 has the destination hopper as described above. Dust adhering to the filter 2 installed in the destination hopper 1 and the air introducing pipe 40 for the air cylinder communicating with the protruding air conducting passage 24 of the air cylinder 21 that drives the on-off valve 9 of No. 1, the sinking air conducting passage 25. The air introduction pipe 13 for removing the liquid is connected.

Further, the air pipe 40 for the air cylinder has a discharge pipe 15
A piston rod operation switching valve 42 for selectively supplying the discharge air introduced through the intake / exhaust pipe 6 to either the projecting air communication path 24 or the submerged air communication path 25 is provided. The piston rod 22 of the cylinder 21 is moved up or down by the discharge air force applied to the flange 22a of the cylinder 21 to close or open the on-off valve 9 with respect to the material outlet 4. At this time, the discharge air supplied to the projecting air conducting path 24 or the immersed air conducting path 25 is the same as the supplied projecting air conducting path 24 or the immersed air conducting path until the next operation of the piston rod 22. It is designed to flow back to the passage 25 and be discharged to the outside of the system. In this case, when the on-off valve 9 is closed, the piston rod operation switching valve of the air introduction pipe 40 for the air cylinder is used so that the back-flow of the air does not open the on-off valve 9 inadvertently closing the material outlet 4.
A check valve 43 is provided upstream of 42.

Reference numeral 16 denotes an intake side switching valve provided on the air source 7 side of the intake / exhaust pipe 6, which closes the suction passage in the intake / exhaust pipe 6 and opens the intake side of the air source 7 to the atmosphere to discharge the intake air source 7. Only air is supplied from the discharge pipe 15 through the intake / exhaust pipe 6 to the above-mentioned lines.

A filter 44 may be provided on the downstream side of the intake / exhaust pipe 6 from the intake side switching valve 16 to protect the intake air source 7 and the intake side switching valve 16 as shown by the chain line in FIG. By making the suction air source 7 a diaphragm valve drive type, it is possible to prevent the discharge air from being contaminated with oil and to prevent troubles of the suction air source 7 due to dust in the suction transportation line.

Install the pressure sensor 45 in the proper place of the intake and exhaust pipe 6
In addition to detecting the air pressure in the inside, a pressure control valve 46 is attached at an appropriate position of the transport pipe 5, and this pressure control valve 46 is connected to a pressure detector 45 via a pipe to detect the pressure detected by the pressure detector 45. It is also possible to adjust the pressure control valve 46 based on the value to adjust the air pressure sucked from the transport pipe 5 to increase the mixing ratio of the material to the air.

As described above, the discharge air from the suction air source 7 is used to drive the air cylinder 21 and / or to remove dust from the filter 2.

The air cylinder 21 may be a known double-acting air cylinder. However, according to this, since the tubes are respectively connected to the two air inlets for retracting the piston rod and are arranged in the transportation destination hopper, the material transported in the transportation destination hopper is used. By
There is a drawback that the tube becomes dirty and adhered and must be constantly cleaned, and if the cleaning is not sufficient, the quality may be deteriorated depending on the physical properties of the material. On the other hand, according to the configurations of the cylinder fixing member 20 and the air cylinder 21 of the present invention, such a defect is eliminated.

Further, as described above, the air cylinder 21 is not limited to the double-acting type, but may be a single-acting type, and the design can be appropriately changed.

The cylinder fixing member 20 is not limited to the illustrated structure, and the protruding air passage 26 and the sinking air passage 27 are
It is not limited to the configuration in which the discharge air is supplied from the left and right end positions on the diameter line, but may be formed in only one side.

Various valves such as the discharge side switching valve 14, the intake side switching valve 16, the intake / exhaust switching valve 41, etc. can be manually operated, but they can also be automatically operated by an electrical method, etc. The operation can be linked by a timer or the like, and the design can be appropriately changed.

When a certain amount of dust or more adheres to the filter 2, an alarm means (not shown) can be used to notify. The filter 2 can also be operated in a pulsed manner by sending a pulse signal to the intake / exhaust switching valve 41.

In special cases, such as when the powder or granules (materials) easily combine with oxygen in the air, it is difficult to use air as the transport gas, so use other suitable gas such as argon or nitrogen. To do. Therefore, in the present invention, the air to be transported should be understood in a broad sense including gas other than air.

Reference numeral 47 is a receiving portion such as a hopper and a synthetic resin molding machine, and reference numeral 48
Is a level meter of the destination hopper 1, and reference numeral 49 is a level meter of the receiving part 47.

(Effects of the Invention) The present invention is configured as described above, and the first invention is that suction air of a suction air source is acted on a destination hopper through an intake / exhaust pipe, and the suction air source A transportation process of transporting the material to the transportation destination hopper by the suction air force,
A valve opening / closing step of opening / closing a material outlet / opening valve of a destination hopper for the discharge air of the suction air source through a part of the intake / exhaust pipe; Including a filter dust removing step for removing dust adhering to the filter, the valve opening and closing step and / or filter dust removing step is characterized in that it is performed while the transportation step is not performed,
A second invention for carrying out the method is a transportation destination hopper 1 having an opening / closing valve 9 for opening and closing the material outlet 4, a transportation pipe 5 and an intake / exhaust pipe 6 connected to the transportation destination hopper 1.
And an intake air source 7 connected to one end of the intake / exhaust pipe 6, and an intake side switching valve 16 on the intake side of the intake air source 7,
A discharge pipe 15 is connected to the discharge port 7a side through a discharge side switching valve 14, the discharge pipe 15 is connected to the intake / exhaust pipe 6 at the tip, and the intake / exhaust pipe 6 is sucked to the transport destination hopper side. An exhaust switching valve 41 is provided, and the intake / exhaust switching valve 41 has an air introduction pipe for an air cylinder that communicates with the air passages 24 and 25 of the air cylinder 21 that drives the opening / closing valve 9 by the discharge air of the suction air source 7. 40 is connected, and / or a suction air introduction pipe 13 for discharging dust adhering to the filter 2 installed in the transportation destination hopper 1 is connected to the suction / exhaust switching valve 41. Therefore, it has the following effects.

(1) Not only the suction / transport process of the material is performed by the suction air force by the suction air source 7 through the suction / exhaust pipe 6, but the air cylinder is also operated by the discharge air of the suction air source 7.
Since the piston rod 22 of 21 is driven in and out to perform the valve opening / closing process of the on-off valve 9, and / or the filter dust removing process of removing the dust of the filter 2 in the transport destination hopper 1 is also performed. As described above, there is no need to use an air source dedicated to the air cylinder or an air source dedicated to dust removal, and not only the number of component parts can be reduced, but also the structure can be simplified.

(2) In addition, the air intake pipe 40 for the air cylinder, the air introduction pipe 13 for expulsion, and the discharge pipe 15 are provided in one intake / exhaust pipe 6.
The above various lines can be configured simply by connecting. There is an advantage that a large number of pipes and complicated assembling work are not required as in the conventional case, and the assembly can be easily performed with a small amount of pipes.

(3) The suction transportation step, the valve opening / closing step in the opening / closing valve 9 driven by the air cylinder, and the filter dust removing step for removing the dust of the filter 2 include the intake side switching valve 16,
It is possible to select very easily because it is only necessary to switch the discharge side switching valve 14 and the intake / exhaust switching valve 41 (piston rod operation switching valve 42).

(4) With the construction as set forth in the third aspect of the invention, as described above, it is not necessary to dispose the air introduction hole connecting tube of the air cylinder in the destination hopper 1 unlike the conventional case. In addition to preventing the material from being contaminated when the tube is damaged by the material,
Further, since the cylinder fixing member 20 is provided above the transportation destination hopper 1, there is an advantage that it does not interfere with the material supply and does not deteriorate due to the material.

[Brief description of drawings]

Each of the drawings shows one embodiment of the present invention, FIG. 1 is a schematic explanatory view of the whole, FIG. 2 is a longitudinal sectional view of a destination hopper, FIG. 3 is a plan view of FIG. 2, and FIG. FIG. 5 is a partial vertical sectional view of the air cylinder, and FIG. 5 is a side view showing a half of the cylinder fixing member in section. 1 ... Transport hopper, 2 ... Filter, 5 ... Transport pipe, 6 ... Intake / exhaust pipe, 7 ... Suction air source, 9 ... Open / close valve, 12 ... Discharge member, 13 ... Discharge Air inlet pipe, 14 …… Discharge side switching valve, 16 …… Intake side switching valve, 20 ……
Cylinder fixing member, 21 ... Air cylinder, 22 ... Piston rod, 24 ... Projection air passage, 25 ... Immersion air passage, 26 ... Projection air passage, 27 ... Immersion air passage, 40
...... Air inlet pipe for air cylinder, 41 ...... Intake / exhaust switching valve, 42 ...... Piston rod operation switching valve, 43 ...... Check valve.

Claims (3)

[Claims] 1. A transportation step of causing suction air of a suction air source to act on a transportation destination hopper through an intake / exhaust pipe, and transporting a material to the transportation destination hopper by a suction air force of the suction air source,
A valve opening / closing step of opening / closing a material outlet / opening valve of a destination hopper for the discharge air of the suction air source through a part of the intake / exhaust pipe; A suction-type pneumatic transportation method comprising a filter dust removal step of removing dust adhering to the filter, wherein the valve opening / closing step and / or the filter dust removal step is performed while the transportation step is not performed. 2. A destination hopper 1 having an opening / closing valve 9 for opening / closing a material outlet 4, a transportation pipe 5 and an intake / exhaust pipe 6 connected to the destination hopper 1, and an intake air source connected to one end of the intake / exhaust pipe 6. 7, an intake side switching valve 16 is connected to the intake side of the intake air source 7, and a discharge pipe 15 is connected to the discharge port 7a side via a discharge side switching valve 14, and the tip of the discharge pipe 15 is connected. Is connected to the intake / exhaust pipe 6, and an intake / exhaust switching valve 41 is provided on the transportation destination hopper side of the intake / exhaust pipe 6, and the opening / closing valve 9 is connected to the intake / exhaust switching valve 41. A filter 2 which is connected to an air introduction pipe 40 for an air cylinder communicating with the air passages 24 and 25 of the air cylinder 21 driven by
A suction-type pneumatic transportation device, characterized in that a scrubbing air introduction pipe (13) for scrubbing dust adhering to (1) is connected to the intake / exhaust switching valve (41). 3. The air cylinder 21 is a destination hopper 1 for transportation.
The air cylinder 21 is suspended by a cylinder fixing member 20 which is horizontally installed on the upper part of the
In the cylinder tube of 21, a projecting air conduction path 24 for projecting the piston rod 22 and an immersion air conduction path 25 for retracting the piston rod 22 are formed by the discharge air of the suction air source 7. Further, the cylinder fixing member 20 is formed with a projecting air passage 26 communicating with the projecting air passage 25 of the air cylinder 21 and an immersion air passage 27 communicating with the immersion air passage 25, and these air passages 26, 27 are formed. Is connected to the air introducing pipe 40 for the air cylinder, and the discharge air introduced from the discharge pipe 15 through the intake / exhaust pipe 6 is further connected to the air introducing pipe 40 for the air cylinder. A piston rod operation switching valve 42 for selectively supplying to any one of 25 is provided.
The suction type pneumatic transportation device according to the item.