JP2537880Y2 - Powder mixing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for mixing powders (hereinafter referred to as materials) such as plastic materials, pharmaceutical materials, processed food materials, and the like.

[Conventional technology]

Conventionally, as a mixing apparatus of this type of powder and granules, one shown in FIG. 5 is known.

In this mixing vessel (A), a stirring blade (C) driven by a driving source (B) is provided inside a mixing tank (A), and a measuring machine (D)... (D) is provided above the mixing tank (A). A plurality of material supply sources (E)... (E) are provided, and a slide damper (G) operated by a fluid pressure cylinder or the like is provided at a discharge port (F) of the mixing tank (A). A predetermined amount of the material stirred and mixed by the stirring blade (C) is supplied to a receiving portion (H) such as a charge hopper by opening and closing the slide damper (G).

[Problems to be solved by the invention]

However, according to the above-described conventional example, (a) the mixing action in the mixing tank (A) is performed by the stirring blade (C), so that foreign matters (impurities) generated by abrasion of the stirring blade (C) during mixing. ) Or fine powder further subdivided by the stirring blade (C) is mixed into the mixed material. Therefore, there is a problem that this mixing apparatus cannot be used in the field of materials such as optical discs in which impurities and finely divided powder must be prevented from being mixed.

(B) In addition, when the material to be mixed comes into contact with the stirring blade (C) at the time of stirring and mixing, the physical properties such as breakage of the material are changed, and the quality of the obtained mixed material is deteriorated.

(C) In addition, since the slide damper (G) is used, foreign matter generated by abrasion caused by sliding of the slide damper (G) causes the same difficulty as in the above (a). ) Has the same disadvantages as in (b) above due to the contact of the mixed material.

(D) Further, not only the stirring blade (C) but also many components such as its driving source (B) and slide damper (G) are required, and the structure is complicated. .

This invention is based on the suction gas power of one suction air source.
In addition to sucking and transporting the material of the material supply source to the mixing hopper, a plurality of materials are mixed by the gas force without using mechanical means such as stirring blades in the same mixing hopper. It is intended to solve the above problem.

[Means for solving the problem]

In order to solve the above-mentioned problem, the present invention relates to a method in which a suction air source is connected via a gas conduit to a mixing hopper connected to a material supply source via a transport pipe, and a material to be mixed by the gas force of the suction air source. While sucking and transporting the mixture into the mixing hopper, and connecting the leading end of the transport pipe to the discharge passage of the material connected to the lower portion of the mixing hopper so as to be inclined upward from below. The angle at which the axis of the discharge passage and the axis of the tip of the transport pipe intersect is an acute angle.

The angle at which the axis of the discharge conduit and the axis of the tip of the transport pipe intersect is 45 °, 30 °, 60 ° as long as it is within the acute angle range.
... etc. can be set appropriately.

It is preferable to provide a valve at the tip of the transport pipe to open the transport path during material transport and mixing and close the transport path during non-material transport.

As shown in FIG. 2, the tip of the gas conduit downstream of the suction air source may be of an open (one-pass) type for discharging exhaust gas from the mixing hopper to the atmosphere. Or,
As shown in FIG. 3, a closed type in which the exhaust gas circulates by connecting the distal end of the gas conduit to the proximal end of the transport pipe may be used. In the case of the closed system, a dehumidifier and a heat source may be provided downstream of the suction air source in the gas conduit.

[Action]

When the suction air source is activated, the material of each material supply source is sucked and transported into the mixing hopper via the transport pipe by the suction gas force. Even after a desired amount of material from each material supply source is supplied into the mixing hopper, if the suction state of the suction air source is continued for a required time by a timer or the like, the suction gas force of the suction air source causes the inside of the mixing hopper to move. The transported materials are uniformly mixed by convection and diffusion,
Mixing can be performed without a conventional mechanical stirring blade.

The material being mixed in the mixing hopper does not fall into the discharge passage due to the suction gas force as long as the suction state of the suction air source continues.

When the operation of the suction air source is stopped, the mixed material in the mixing hopper is dropped into the receiving portion such as the charge hopper because the upward suction action by the suction gas force is stopped. On the other hand, the exhaust gas and dust in the mixing hopper are discharged out of the system via a gas conduit or are circulated after being collected by a dust collecting device.

By repeating the above operation, it can be used continuously.

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIG. 1 and FIG.

(1) is a mixing hopper, to which a plurality of material supply sources (11)... (11) are connected via a transport pipe (10) and a gas conduit (21). ) Through a suction air source such as a blower or vacuum pump (2
0) is connected, and the material to be mixed is sucked and transported into the mixing hopper (1) by the gas force of the suction air source (20).

An optional weighing machine (12) such as a rotary feeder or a table feeder is provided at the outlet of each material supply source (11), and the weighing machine (12) allows various materials from each material supply source (11) to be obtained. It is designed to be transported into the transport pipe (10) by the quantity. A filter (13) is attached to the proximal end of the transport pipe (10).

The mixing hopper (1) has a cylindrical hopper body (1
a), a conical section (1b) formed continuously below the hopper body (1a), and a connecting pipe section (2) communicating with the gas conduit (21). A separator (3) is provided between the hopper body (1a) and the lid (1c) to separate the material and the transport gas.

In this embodiment, the leading end of the transport pipe (10) is connected to the material discharge passage (4) connected to the lower part of the mixing hopper (1) as an upward gradient from the bottom to the top.
That is, the axis (a) of the discharge conduit (4) and the transport pipe (1)
Assuming that the angle at which the axis of the tip of (0) intersects with the axis (b) is Θ, this Θ is an acute angle of 45 ° in FIG. 1, but can be appropriately selected within the acute angle range.

As shown in FIG. 1, the transport pipe (10) is the other branch pipe of the substantially Y-shaped pipe having one of the branch pipes as the discharge conduit (4) (also the tip of the transport pipe (10)). And several short tubes (14),
(15) and (16) are connected by a flange (17) or the like. However, the present invention is not limited to such a configuration. For example, the tip of the transport pipe (10) is substantially Y as described above.
Instead of being integrally formed as a U-shaped tube, it is also possible to connect this transport stub to a discharge conduit (4) connected to the lower part of the mixing hopper (1) as a single transport stub.

The exhaust gas separated by the separator (3) is discharged to the outside of the system through a gas conduit (21) and a suction air source (20) in a one-pass manner, and dust is collected by a dust collector (24) such as a bag filter. Collected. Meanwhile, mixing hopper (1)
The material mixed therein is supplied to a destination such as a synthetic resin molding machine (6) via a discharge passage (4) and a receiving portion (5) such as a charge hopper.

(7) is a level meter, (8) and (8a) are a lower flange (1c ') of a lid (1c), an upper flange (1a') of a hopper body (1a), and a lid (5) of a receiving part (5). 5a) and a pair of screw shafts screwed into the lower flange (5b) to fix the lid (1c), the hopper body (1a) and the receiving part (5). The length of the pair of screw shafts (8) and (8a) is adjusted to adjust their tightness.

Second Embodiment FIG. 3 shows a second embodiment. This is different from the first embodiment in that the distal end of the gas pipe (21) is connected to the base end of the transport pipe (10) to circulate the exhaust gas from the mixing hopper (1) and to circulate the gas. Downstream of the suction air source (20) of the conduit (21), a dehumidifier (22) and a heat source (23)
Is provided, and the same reference numerals as those in FIGS. 1 and 2 denote the same components as those of the first embodiment.

When the gas conduit (21) and the transport pipe (10) are closed as described above, not only can the exhaust gas from the mixing hopper (1) be reused, but also the dehumidifier (22) and the heat source (2).
According to 3), there is an advantage that the material from the material supply source (11) can be sent to the mixing hopper (1) by hot air while preventing moisture absorption of the exhaust gas.

Of course, it can be of a closed type without the dehumidifier (22) and the heat source (23).

At the tip of the transport pipe (10) of each embodiment, a valve is provided to open the transport path (10a) during material transport and mixing, and to close the transport path (10a) when no material is transported. At times, it is advisable to prevent the material from remaining in the transport path (10a). For example, as shown in FIG. 4, a hydraulic cylinder (31) is attached below the axis (b) of the tip of the transport pipe (10),
The valve (30) is provided at the tip of the cylinder rod (32). When the material is transported from the transport path (10a) into the mixing hopper (1), the valve (30) is lowered by a fluid pressure cylinder (31) as indicated by a dashed line, and a predetermined angle (for example,
(180 °), so that the material is not accumulated and the transport path (10a) is opened so that the material can be transported from the transport path (10a) to the mixing hopper (1). on the other hand,
Discharged mixed material in mixing hopper (1)
During non-transportation such as discharging from
While moving the valve (30) upward by 1), a predetermined angle (for example, 180)
°) and rotate to the upper solid line
a) is closed so that some of the mixed material from the mixing hopper (1) does not flow back into the transport path (10a). The operating means of the valve (30) is not limited to the hydraulic cylinder (31), and may be any other means.

The present invention can be applied to a device in which materials such as additives are directly supplied to the mixing hopper (1).

 The operation of both embodiments will be briefly described below.

When the suction air source (20) is operated (turned on) when the level meter (7) of the receiving part (5) transmits the material request signal, the weighing machine (12) of each material supply source (11) ... (12) Is operated to suck and transport the material for each set value to the mixing hopper (1) via the transport pipe (10). After the weighing machines (12)... (12) of each material supply source (11) stop operating, the suction air source (20) is operated for a predetermined time, and the various materials in the mixing hopper (1) are removed by the suction air source ( Mix with the gas power of 20).

When the suction air source (20) stops operating, the mixed material in the mixing hopper (1) is discharged to the receiving portion (5) through the discharge passage (4), while the exhaust gas and dust are discharged to the gas conduit (5). It is discharged out of the system via 21) and the suction air source (20) (see FIG. 2), or is circulated to the transport pipe (10) after passing through the suction air source (20) (see FIG. 3). When the material level of the receiving part (5) is confirmed and insufficient, the level meter (7) transmits the above-mentioned material request signal and repeats the above operation.

[Effect of the invention]

According to this invention, a suction air source is connected through a gas conduit to a mixing hopper connected to a material supply source through a transport pipe, and the material to be mixed is mixed into the mixing hopper by the gas force of the suction air source. Along with performing suction transport, the distal end of the transport pipe is connected to the discharge passage of the material connected to the lower portion of the mixing hopper so as to be inclined upward from below, and the discharge passage of the discharge passage is Since the angle at which the axis intersects the axis of the tip of the transport pipe is an acute angle, the following effects are obtained. (1) The gas force of one suction air source not only suctions and transports various materials into the mixing hopper, but also mixes the materials transported into the mixing hopper. Since there is no blade or slide damper, finely divided powder and foreign matter (impurities) do not enter the mixed material. For this reason, the present invention can be used in the field of materials which are not likely to be mixed with finely divided fine powders or impurities such as optical disks.

(2) In addition, since the mixing is performed by gas force without mixing with the stirring blade as in the conventional example, the mixed material is not damaged and a mixed material having high quality and high mixing efficiency can be obtained.

(3) Further, the material in the mixing hopper has a classification effect due to the flow action of the gas force due to the suction of the suction air source, and the fine powder component mixed in the material to be mixed such as pellets and pulverized material is separated by a separator. The separated material is separated and removed by a dust collector and collected by a dust collector, and the mixed material does not have the fine powder component. Therefore, not only the bite of the mixed material into the screw of the synthetic resin molding machine is stabilized, but also the fine Molding defects due to powder components can be eliminated.

(4) In addition, many components such as the conventional stirring blade, its driving source, and slide damper are not required.
The structure is also simple.

(5) According to the structure of claim (2) or (3), the same effects as described above can be obtained.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a partial longitudinal sectional view of the first embodiment, FIG. 2 is a schematic front view of the whole, FIG. 3 is a schematic front view of the whole of the second embodiment, and FIG. FIG. FIG. 5 is a schematic vertical sectional view of a conventional example. (1) ... mixing hopper, (4) ... discharge passage,
(5) ... receiving part, (10) ... transport pipe, (10a) ... transport path, (11) ... material supply source, (12) ... weighing machine, (20)
… Suction air source, (21) gas conduit, (22) dehumidifier, (23) heat source, (30) valve, (a) discharge discharge channel axis, (b) …… the axis of the tip of the transport pipe,
(Θ)… horn.

Claims (3)

(57) [Scope of request for utility model registration] 1. A suction air source (20) is connected via a gas conduit (21) to a mixing hopper (1) connected to a material supply source (11) via a transport pipe (10). The material to be mixed is sucked and transported into the mixing hopper (1) by the gas force of the source (20), and the distal end of the transport pipe (10) discharges the material connected to the lower part of the mixing hopper (1). It is connected to the conduit (4) so as to form an upward slope from below, and the axis (a) of the discharge conduit (4) and the axis (b) of the tip of the transport pipe (10). Characterized in that the angle (Θ) at which と intersects is defined as an acute angle. 2. A valve (30) is provided at the tip of the transport pipe (10) to open the transport path (10a) during material transport and mixing and to close the transport path (10a) when no material is transported. An apparatus for mixing powder and granules according to claim (1). 3. A gas pipe (21) having a distal end connected to a base end of a transport pipe (10) to circulate exhaust gas from a mixing hopper (1) and to draw air from said gas conduit (21). Downstream from the source (20) is a dehumidifier (22) and a heat source (23)
The mixing device for a granular material according to claim 1 or 2, further comprising: