JP4319027B2 - Raw material mixing equipment for powder transportation equipment - Google Patents

Description

The present invention relates to a raw material mixing apparatus in a granular material transport apparatus that transports and mixes powder particles (hereinafter referred to as raw materials) such as plastics materials, pharmaceutical materials, and processed food materials.

Conventionally, as a raw material mixing apparatus in this kind of granular material transport apparatus, the one shown in FIGS. 5 to 7 is known (see, for example, Patent Document 1). In FIG. 5, the mixing hopper 30 for mixing the raw materials has a connecting pipe part 32 communicating with a suction air source (not shown) in a lid 31 and a discharge conduction path 33 in the center of the lower end part. The raw material transport pipe 34 is connected to the discharge conduction path 33 at an acute angle. The separator 35 separates the raw material and the transport gas, and is provided on the upper portion of the mixing hopper 30 upstream of the connecting pipe portion 32.

Then, the flow action of the transport gas by suction of the suction air source acts on the transport pipe 34 via the connecting pipe portion 32 and the mixing hopper 30, and a plurality of raw materials are transported together with the transport gas as shown by arrows, and are discharged. It is disclosed that it flows into the passage 33 at an acute angle, enters the mixing hopper 30 above the lower end of the mixing hopper 30, and is uniformly mixed by convection / diffusion, etc., and can be mixed without mechanical stirring blades. .

  However, in such a raw material mixing apparatus, since the raw material introduced simply from the lower side of the mixing hopper 30 is sucked upward in the mixing hopper 30 and dropped by the flow action of the transporting gas by suction, the mixing operation is repeated. Sometimes it was not mixed well. Further, when the mixed raw material is temporarily stored in the receiving portion 36 for transporting the mixed raw material to the synthetic resin molding machine (not shown) via the discharge conductive path 33, the mixed raw material is connected to the discharge conductive path 33 of the transport pipe 34. Backward to the connection port 37 and the remaining amount.

In addition, when the mixed hopper 30 is entirely circular, the falling flow path at the time of discharging the mixed raw material has a falling speed at the central portion of the mixing hopper 30 that is directly above the discharge conduction path 33 compared to the outer peripheral portion. Due to the increase in the drop speed, the raw materials once mixed may be separated again. This separation action is further enhanced by the difference in charging characteristics of the raw material mixed with the static electricity generated on the peripheral side surface of the mixing hopper 30 when the mixing operation is performed.

Further, in this conventional example, as shown in FIG. 6, a valve 38 is provided that is movable in the direction of the arrow by a fluid pressure cylinder that opens the connection port 37 when transporting unmixed raw materials and closes the connection port 37 when discharging mixed raw materials. When the mixed raw material is discharged, it flows back to the connection port 37 so that it does not become a remaining amount. Therefore, the fluid pressure cylinder, the valve 38, and a control unit that moves these to open and close the connection port 37 are newly required.

Furthermore, in the raw material mixing apparatus shown in FIG. 5, as described above, convection promotion is performed as shown in FIG. 7 in order to improve the problem of insufficient mixing because the mixing operation of simply sucking and dropping upward in the mixing hopper 30 is repeated. It is conceivable that the obstacle 39 for use is provided in the mixing hopper 30 by the support member 40 and the raw material sucked upward in the mixing hopper 30 is collided and guided in the outer circumferential direction.

According to such a raw material mixing apparatus, the raw materials are sufficiently mixed, and the separation action at the time of discharging the mixed raw materials can be suppressed. However, the strip-like piece (commonly called snake skin) generated by the raw material adhering to the support member 40 of the obstacle 39 gradually closes the discharge conduction path 33 and makes it difficult to smoothly discharge the mixed raw material. There is a risk that
Japanese Utility Model Publication No. 3-32936

In view of the problems of the above-described conventional technology, the problem to be solved by the present invention is that of a granular material transport device that can obtain a good mixing action of raw materials with a simple configuration without providing an obstacle for promoting convection. The object is to provide a raw material mixing apparatus.

The first invention of the present invention comprises a raw material mixing hopper having a mixed raw material discharge part at the center of the lower end and an air suction pipe leading to an air suction source at the upper part of the closed lid, and the raw material mixing hopper includes the air An unmixed raw material introduction pipe for sucking unmixed raw material toward the lower center by the suction force of the suction pipe is provided, and the unmixed raw material introduction pipe has the sucked unmixed raw material in the raw material mixing hopper. It is the raw material mixing apparatus of the granular material transport apparatus having a structure in which the gap to be sucked up is left down in the raw material mixing hopper.

Thereby, the unmixed raw material sucked out from the unmixed raw material introduction pipe toward the center of the lower end of the raw material mixing hopper is further sucked upward, and the action of the unmixed raw material introduction pipe leads to the outer periphery from the central portion of the raw material mixing hopper. It is swirled and mixed with stirring, can be mixed with a simple structure, and can be discharged without separating the mixed raw materials.

The second invention comprises a raw material mixing hopper having a funnel-shaped lower part , a mixed raw material discharge part at the center of the lower end, and an air suction pipe leading to an air suction source at the closed upper part, Is provided with an unmixed raw material introduction tube in the longitudinal center of the raw material mixing hopper, where unmixed raw material is sucked out toward the center of the lower end by the suction force of the air suction tube, A lower end is provided to hang down to a position where a gap is formed between the bottom of the funnel-shaped bottom of the raw material mixing hopper, and the sucked unmixed raw material is sucked into the raw material mixing hopper, and further from the center. It is the raw material mixing apparatus of the granular material transport apparatus characterized by swirling toward the outer periphery and mixing.

Thereby, the unmixed raw material sucked out from the unmixed raw material introduction pipe toward the lower end center of the raw material mixing hopper is sucked upward along the center in the raw material mixing hopper, and further swung toward the outer periphery from the center. The mixture is stirred and mixed, can be mixed well with a simple structure, and can be discharged without separating the mixed raw materials.

The third invention includes a raw material mixing hopper having a mixed raw material discharge portion at the center of the lower end and an air suction pipe leading to an air suction source at the upper part of the closed lid, and the raw material mixing hopper has the air at the inner center. An unmixed raw material introduction pipe through which unmixed raw material is sucked into the raw material mixing hopper by the suction force of the suction pipe is provided in the vertical direction, and the upper end portion of the unmixed raw material introduction pipe is provided above the raw material mixing hopper. A granular material transporting device connected to an unmixed material input pipe and opened to face the mixed material discharge part leaving a gap where the unmixed material sucked out at the lower end is sucked into the material mixing hopper This is a raw material mixing device.

As a result, the unmixed raw material that has been sucked from the unmixed raw material introduction pipe toward the center of the lower end of the raw material mixing hopper and then sucked upward further is undisposed in the vertical direction along the central portion of the raw material mixing hopper. Due to the resistance of the mixed raw material introduction pipe, it is sucked upward along this, and a driving force in the horizontal direction is obtained and swirled to the outer periphery to be stirred and mixed. Therefore, good mixing and mixed raw materials can be discharged without separation, and these can be obtained with a simple configuration.

4th invention is the raw material mixing apparatus of the granular material transport apparatus which provided the unmixed raw material introduction pipe of any one of the 1st-3rd invention in the raw material mixing hopper so that attachment or detachment was possible, Can be attached to and detached from the raw material mixing hopper, and even if the unmixed raw material introduction pipe in the raw material mixing hopper is long, the maintenance can be performed without difficulty by removing it.

5th invention is the raw material mixing apparatus of the granular material transport apparatus which provided the filter in the raw material mixing hopper of any one of the 1st-4th invention in the upstream of an air suction pipe, and it is dust, friction As a result, fine particles such as powder generated from the granular material flow out of the air suction pipe through the filter, and the raw material separated from the suction air can be reliably left in the raw material mixing hopper.

The raw material mixing device of the granular material transport device of the present invention can provide good stirring and mixing of the unmixed raw material and good discharge of the mixed raw material without providing an obstacle for convection promotion in the raw material mixing hopper, It can be a simple structure.

The best mode for carrying out the present invention will be described below with reference to the drawings. The present invention is not limited to the present embodiment. Further, in the description of the present embodiment, the same reference numerals are given to the same configuration and the effects and the same description is not repeated.

(Embodiment 1)
FIG. 1 is a longitudinal cross-sectional view of the raw material mixing apparatus of the granular material transport apparatus according to Embodiment 1 of the present invention when mixing the raw materials. FIGS. (A) is at the time of starting the suction of the raw material, (b) is during the suction of the raw material, (c) is the start of mixing of the raw material, and (d) is during the mixing of the raw material. FIG. 3 is a longitudinal sectional view of the raw material mixing device of the same granular material transporting apparatus when the mixed raw material is discharged.

In the figure, a raw material mixing hopper 1 stirs and mixes a plurality of unmixed raw materials, for example, plastic powder particles, and transports them to, for example, a synthetic resin molding machine 2 that requires mixed raw materials. Accordingly, a plurality of raw material supply sources 4 are connected to the raw material mixing hopper 1 through a transport pipe 3 and an air suction source 6 such as a blower or a vacuum pump is connected through an air transport pipe 5. The unmixed raw material is sucked and transported into the raw material mixing hopper 1 through the transport pipe 3 by the air suction force of the air suction source 6, and only the powder generated from the powder particles due to friction or the like, dust contained in the powder particles is air It is conveyed through the transport pipe 5 and only air is discharged from the air suction source 6.

The raw material supply source 4 is provided with a weighing machine 7 at the outlet, and the weighing machine 7 transports various raw materials from the respective raw material supply sources 4 into the transport pipe 3 in desired amounts. The transport pipe 3 is provided with a filter 8 at the base end. The raw material mixing hopper 1 is formed in a funnel-shaped cylindrical shape having a cylindrical mixed raw material discharge portion 10 that has a lower portion 9 formed in a funnel shape and opens at a bottom center portion that is a bottom surface. A lid 12 is provided so as to be freely opened and closed by a hinge 11.

The unmixed raw material introduction pipe 13 is provided at the center in the vertical direction of the raw material mixing hopper 1 so that the unmixed raw material is sucked into the raw material mixing hopper 1 by the air suction force, and the upper end portion is the center of the lid body 12. The unmixed raw material sucked out at the lower end is sucked into the raw material mixing hopper 1 along the outer periphery of the unmixed raw material introduction pipe 13. In this way, it hangs down to a position where a gap 15 is formed between the lower surface 9 and the bottom surface of the lower portion 9, and is opened facing the mixed material discharge portion 10.

Therefore, the unmixed raw material introduction pipe 13 is located at the center in the vertical direction in the raw material mixing hopper 1 and becomes a resistance to the sucked unmixed raw material, and is not mixed in the vertical center in the raw material mixing hopper 1. The material is sucked upward along the outer peripheral surface of the raw material introduction pipe 13 (vertical motion), and further swirled from the center in the raw material mixing hopper 1 toward the outer periphery (horizontal motion) to be mixed.

Note that the gap 15 is a distance between the lower end opening surface of the unmixed raw material introduction pipe 13 and the mixed raw material discharge section, and if it is too small, the suction resistance increases, which is not preferable. At least the lower end of the unmixed raw material introduction pipe 13 The opening surface hangs down to the inside of the funnel that forms the lower portion 9, and the lower end portion of the unmixed raw material introduction pipe 13 is placed below the lower portion 9 by the start of suction as shown in FIGS. 2 (a) to (c). Covered with the raw material accumulated at the lower end, the flow rate of air passing through a narrow gap between the raw materials is increased and the accumulated raw material is sucked upward so that a large amount of raw material is accumulated in the lower lower part of the lower part 9. This is a relative relationship with the position of the lower end opening surface depending on the length of the unmixed raw material introduction pipe 13.

The air suction pipe 16 is formed in an L shape and is fixed to the lid 12 adjacent to the unmixed raw material introduction pipe 13, connected to the air transport pipe 5 at one end, and the raw material mixing hopper 1 at the other end. There is an opening at the top inside. The filter 17 is formed of a punching plate or the like, and the outer peripheral packing 18 is airtightly sandwiched between the upper end of the raw material mixing hopper 1 and the lid 12 and is detachably attached. A hole 17a through which the unmixed raw material introduction pipe 13 can be inserted and removed is opened at the center of the filter 17.

The on-off valve 19 is provided in the mixed raw material discharge unit 10 and is closed during mixing of the unmixed raw material, and is opened when the mixed raw material is discharged. The receiving unit 20 temporarily stores the mixed raw material when transported to the synthetic resin molding machine 2. The dust collector 21 is provided in the air transport pipe 5 in front of the air suction source 6 and collects dust, powder and the like transported together with air.

In the above embodiment, when a level meter (not shown) of the receiving unit 20 on the synthetic resin molding machine 2 issues a raw material request signal, the air suction source 6 starts operation and is indicated by an arrow. Thus, an air flow occurs in the entire conveyance path of the transport pipe 3, the unmixed raw material input pipe 14, the unmixed raw material introduction pipe 13, the raw material mixing hopper 1, the air suction pipe 16, and the air transport pipe 5. Exhausted. In response to the start of operation of the air suction source 6, the weighing machine 7 of the raw material supply source 4 is operated, and unmixed raw materials for the respective set values are transported from the raw material supply source 4 to the transport pipe 3, unmixed raw materials over a predetermined time. The unmixed raw material introduction pipe 13 is transported into the raw material mixing hopper 1 by the air suction force through the charging pipe 14.

Then, the unmixed raw material sucked into the raw material mixing hopper 1 is stirred and mixed in the raw material mixing hopper 1 by the action of the unmixed raw material introduction pipe 13 and the raw material supply source for supplying unset raw materials for a set value. 4, even after the operation of the weighing machine 7 is stopped, the unmixed raw material in the middle of the transport pipe 3 is sucked into the raw material mixing hopper 1 by the operation of the air suction source 6 for a predetermined time and mixed by stirring. The air suction source 6 stops its operation after the stirring and mixing in the raw material mixing hopper 1 is finished, and in response to this, the on-off valve 19 automatically opens and closes the mixed raw material discharge unit 10 and mixes the raw material in the receiving unit 20. Is used by the synthetic resin molding machine 2.

In particular, the stirring and mixing of the unmixed raw material sucked into the raw material mixing hopper 1 in the present embodiment is performed through the raw material mixing process shown in FIGS. 2 (a) to 2 (d). That is, as shown in FIG. 2 (a), the unmixed raw material due to the suction force generated in the air suction pipe 16 has a large opening at the lower end of the unmixed raw material introduction pipe 13 at the start of suction. Since the air flow rate ratio (air resistance) is relatively small, the lower part in the raw material mixing hopper 1 is not sucked into the raw material mixing hopper 1 and passes through the unmixed raw material introduction pipe 14 and the lower end opening of the unmixed raw material introduction pipe 13. It accumulates in the vicinity of the mixed raw material discharge part 10 which is the bottom of 9.

Then, during the suction after the suction start shown in FIG. 2 (b), the unmixed raw material that has accumulated in the vicinity of the mixed raw material discharge section 10 in the lower portion 9 in the raw material mixing hopper 1 The amount is enough to cover the outer peripheral portion of the lower end opening of the introduction pipe 13. And the air which conveys the unmixed raw material which passes this part must pass through the narrow clearance gap between unmixed raw materials, an air flow rate ratio becomes large and a flow rate rises, and an unmixed raw material is sucked up. Begins to rise.

Further, at the start of mixing shown in FIG. 2 (c), since the unmixed raw material is continuously introduced from the lower end opening of the unmixed raw material introduction pipe 13, it is sucked upward and shown in FIG. 2 (b). The unmixed raw material that has begun to be sucked upward in the shape of a mountain along the outer periphery of the unmixed raw material introduction tube 13 becomes a resistance due to the resistance of the unmixed raw material introduction tube 13 located in the center of the raw material mixing hopper 1 in the vertical direction, That is, the air flow velocity becomes smaller as it goes upward, and no further unmixed raw material is sucked up, and the supply of the unmixed raw material for the set value is finished on the raw material supply source 4 side, and transportation is stopped.

Then, during mixing shown in FIG. 2D, the unmixed raw material sucked upward in a mountain shape along the outer periphery of the unmixed raw material introduction pipe 13 receives the resistance of the unmixed raw material introduction pipe 13 and is Since the flow velocity of this is lower than the central portion, it receives a horizontal motion force and falls while turning in the direction of the outer periphery, and such swirling is repeated and stirred and mixed in the raw material mixing hopper 1.

The raw material agitated and mixed as described above stops turning when the operation of the air suction source 6 stops, and accumulates in the lower part 9 of the raw material mixing hopper 1. The accumulated mixed raw material becomes raw material when the on-off valve 19 is opened. The unmixed raw material introduction pipe 13 located in the central portion of the mixing hopper 1 in the vertical direction becomes a resistance, and the mixed raw materials in the central portion and the outer peripheral portion gather together in a gap 15 as shown in FIG. It can fall by its own weight from the mixed raw material discharge part 10, and can make it difficult to separate as described in the prior art.

As described above, according to the present embodiment, the unmixed material introduction pipe is located at the center in the longitudinal direction in the material mixing hopper and becomes a resistance to the sucked unmixed material, and the longitudinal direction in the material mixing hopper The vertical motion that is sucked upward along the outer periphery of the unmixed raw material introduction pipe in the center and the horizontal motion from the center in the raw material mixing hopper toward the outer periphery are given, both upward suction and horizontal direction The mixing function can be greatly improved as compared with the conventional technology.

In addition, the unmixed material introduction pipe is in the center in the vertical direction in the material mixing hopper, and the mixed material is guided to the gap in a balanced manner, resulting in a difference in the material fall speed between the outer periphery and the center as in the prior art. Therefore, the mixed raw materials can be discharged without separation.

Furthermore, since the unmixed raw material introduction pipe is detachably connected using the unmixed raw material input pipe and hangs down in the vertical center of the raw material mixing hopper, a new mounting member is provided in the raw material mixing hopper. Therefore, it is possible to solve the problem that the string-like snake skin included in the unmixed raw material is caught on the support member of the obstacle during the stirring and mixing described in the conventional technique. Furthermore, since the raw material mixing hopper can be removed from the unmixed raw material introduction tube at the time of maintenance, there is no problem when performing maintenance with the lid removed by the hinge.

In this embodiment, the unmixed raw material introduction pipe and the unmixed raw material input pipe are configured separately, but the integral pipe may be divided into two parts, one of which is L-shaped and the other is made longer. Therefore, one tube has both functions, and the configuration is simpler.

Furthermore, as is clear from the contents explained above, one unmixed raw material introduction pipe has a function of promoting the mixing of the unmixed raw material, a function of preventing separation when discharging the mixed raw material, and It fulfills the three functions of the unmixed raw material input pipe, and this type of raw material mixing apparatus can be greatly simplified in configuration, which is a remarkable feature.

(Embodiment 2)
FIG. 4 is a longitudinal cross-sectional view of the raw material mixing device in the raw material mixing device in the granular material transport device showing Embodiment 2 of the present invention. The present embodiment is different from the first embodiment in that it is designed to improve the filter clogging in the raw material mixing hopper, and the same reference numerals are assigned to the other configurations and operational effects that are the same. The explanation will focus on the differences.

In FIG. 4, the umbrella-shaped plate body 22 is detachably attached to the outer periphery of the upper end portion of the unmixed raw material introduction pipe 13 and the outer peripheral portion is brought close to the outer peripheral inner surface of the raw material mixing hopper 1 to form an annular gap 23. The filter 17 is formed to serve as the filter 17 described in the first embodiment, and is configured so as not to be clogged by not having a large number of holes. The annular turning guide body 24 has an outer peripheral portion attached to the packing 18, and the air passing through the annular gap 23 is turned inward from the outer peripheral inner surface of the raw material mixing hopper 1 to the upper side of the plate body 22, thereby reducing the air flow velocity. Thus, the prevention of passage of powder fluid by the blocking action of the plate body 22 and the passage of other dust are promoted.

In the above embodiment, the air sucked up from the lower end opening of the unmixed raw material introduction pipe 13 is guided to the plate body 22 and goes around the gap 23 side along the umbrella-like surface of the plate body 22. It passes through the gap 23 while decreasing the flow velocity. Therefore, the unmixed raw material sucked up by the flow of air does not fall out of the suction force due to the suction force in the middle and flows out of the gap 23, but only the dust contained in the unmixed raw material passes through the gap 23. Further, it is guided by the turning guide body 24, sucked from the air suction pipe 16 while changing the direction inward along the upper side of the plate body 22, and collected by the dust collector 21 through the air transport pipe 5.

As described above, in this embodiment, the plate serving as a filter is not clogged unlike the punching metal having a large number of holes as in the filter shown in the first embodiment, so that maintenance is unnecessary. This is advantageous in terms of maintenance management.

In the above-described embodiment, the open / close valve provided in the mixed raw material discharge unit of the raw material mixing hopper is opened and closed, and the mixed raw material is required.For example, the mixed raw material is supplied to the synthetic resin molding machine. Even if the mixed raw material discharge unit of the raw material mixing hopper is directly connected to the synthetic resin molding machine, for example, and the mixed raw material is supplied, the same effect as that of the invention of the above embodiment can be obtained. Is.

As described above, the raw material mixing device of the granular material transport device according to the present invention has a simple structure and can mix unmixed raw materials and discharge mixed raw materials. It can be applied to mixing technology of powdered food materials.

1 is a longitudinal sectional view of a raw material mixing apparatus of a granular material transport apparatus according to Embodiment 1 of the present invention. (A) Starting sucking of raw materials in the raw material mixing process in the raw material mixing apparatus of the same granular material transport device, (b) during sucking of raw materials, (c) starting mixing of raw materials, (d) Diagram showing mixing The longitudinal cross-sectional view at the time of the discharge of the mixed raw material of the raw material mixing apparatus of the granular material transport apparatus in Embodiment 1 The longitudinal cross-sectional view of the raw material mixing apparatus of the granular material transport apparatus in Embodiment 2 of this invention Schematic configuration diagram of a raw material mixing device in a conventional granular material transport device Schematic configuration diagram of the main parts of the raw material mixing equipment Other schematic configuration diagram of the raw material mixing device

DESCRIPTION OF SYMBOLS 1 Raw material mixing hopper 6 Air suction source 10 Mixed raw material discharge part 13 Unmixed raw material introduction pipe 14 Unmixed raw material introduction pipe 15 Gap 16 Air suction pipe 17 Filter 22 Plate body 23 Gap

Claims (5)

A raw material mixing hopper having a mixed raw material discharge portion at the center of the lower end and an air suction pipe leading to an air suction source at the upper part of the lid is provided, and the raw material mixing hopper is unmixed raw material by the suction force of the air suction pipe Is provided with an unmixed raw material introduction pipe that is sucked out toward the center of the lower end, and the unmixed raw material introduction pipe leaves a gap through which the sucked unmixed raw material is sucked into the raw material mixing hopper. A raw material mixing device for a granular material transporting device, wherein the raw material mixing device is lowered to the lower side in the mixing hopper. The lower part is provided with a raw material mixing hopper having a funnel-like lower part , a mixed raw material discharge part at the center of the lower end , and an air suction pipe leading to an air suction source at the upper part of the lid, and the raw material mixing hopper includes the air suction pipe An unmixed raw material introduction pipe through which unmixed raw material is sucked out toward the lower end center by the suction force is provided at the inner center in the vertical direction of the raw material mixing hopper , and the lower end portion of the unmixed raw material introduction pipe is mixed with the raw material. Provided by hanging down to a position where a gap is formed between the bottom of the funnel-shaped bottom of the hopper, the sucked unmixed raw material is sucked into the raw material mixing hopper, and further swung from the center toward the outer periphery. A raw material mixing device for a granular material transporting device characterized by mixing. A raw material mixing hopper having a mixed raw material discharge portion at the center of the lower end and an air suction pipe leading to an air suction source at the upper part of the closed lid is provided, and the raw material mixing hopper has a vertical inner center of the air suction pipe. An unmixed raw material introduction pipe for sucking unmixed raw material into the raw material mixing hopper by suction force is provided, and the unmixed raw material introduction pipe is connected to an unmixed raw material introduction pipe provided at the upper end of the raw material mixing hopper. A granular material transporting device characterized in that the unmixed raw material sucked out at the lower end portion is opened opposite to the mixed raw material discharge portion leaving a gap where the unmixed raw material is sucked into the raw material mixing hopper. Raw material mixing equipment. The raw material mixing apparatus of the granular material transport apparatus according to any one of claims 1 to 3, wherein the unmixed raw material introduction pipe is detachably provided in the raw material mixing hopper. The raw material mixing apparatus of the granular material transport apparatus according to any one of claims 1 to 4, wherein the raw material mixing hopper is provided with a filter upstream of the air suction pipe.
The raw material mixing apparatus of the granular material transport apparatus according to claim 5.

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