JPH1066853A - Powder-mixer of pulsating air flow-type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a process in which each kind of powder is made to have a prescribed film breadth and supplied more thinly and uniformly by providing a multistage oscillating feeder in which troughs the bottom surfaces of which have nearly equal breadth are formed in a vertically multistage form to be in a reverse step shape in which the tip in the transportation direction of each trough projects forward in sequence as it moves upward. SOLUTION: A powder mixer 1 of pulsating air flow type is composed mainly of a mixer main body 3 in which a multistage oscillating feeder 2 is integrated on the upper part side. In a feeder 2, each trough 4 of an oscillating transportation plate is integrated in a vertical step shape to a holding frame 5 and oscillated by an oscillator 6 installed in a lower part. The frame 5 has an opening part 6a for supply on the upper surface 6 side and an opening 7a for discharge on the bottom surface 7 side, the inside of the frame 5 four supporting plates 8 are formed between the bottom surface 7 and the upper surface 6 at prescribed intervals, and troughs 4 are set attachably/detachably on each supporting plate 8. Each trough is arranged in a vertically multistage form, its tip 4b in the transfer direction is formed in a reverse step shape to project forward in sequence as it moves from the lowest step to the upper step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a powder mixing apparatus for mixing powders by pulsating airflow.

[0002]

2. Description of the Related Art Conventionally used powder mixing apparatuses are classified into a fixed vessel type, a rotating vessel type, and a fluid motion type.
Each has its advantages and disadvantages, and the optimal type is selected and used according to the properties and physical properties of the raw material powder. As a new fluid motion type mixing device, a powder mixing device using pulsating airflow (Powder Engineering Society, Vol. 32, No. 5, P
319, 1995). In this apparatus, the mixer body has a rectangular cylindrical shape with the upper part as a powder supply port and the lower part as a powder discharge port, and through a plurality of horizontal slits provided in multiple stages in the vertical direction facing both side walls. By intermittently changing the direction of mixing and blowing a horizontal airflow into the interior, each powder supplied to the powder supply port and flowing down in the form of a multilayer film is shifted from the vertical flow in the horizontal direction as a whole. It promotes mixing while pulsating or changing the waveform in the vertical direction.

[0003]

In the above-mentioned pulsating air flow type mixing apparatus, the means for supplying powder to the mixer main body includes a plurality of slit-supplying members through which the respective powders to be mixed are passed by a fixed amount. It is configured so that it is installed on the powder supply port side, and each powder is continuously dropped and supplied through the corresponding slit, and the supply amount is controlled at a ratio according to the opening area and the number of each slit. ing. However, in such a structure, for example, when a large amount of each powder is continuously mixed, the amount and speed of the powder passing through the slit are affected by moisture and the like with the passage of time. Easy to become unstable. In this pulsating airflow type, when each powder is supplied in the form of a film, it is important to make the film thinner and to make the concentration in the width direction of the film uniform. A feasible device structure is not yet completed.

[0004] In view of the above background, an object of the present invention is to provide a pulsating air flow type powder mixing apparatus which is industrially applicable by providing a powder supplying means suitable for a pulsating air flow type. is there. Another object of the present invention is to make it possible to supply each powder thinner and more uniformly with a predetermined film width in a pulsating airflow type powder mixing apparatus. Further objects will be clarified in the following description.

[0005]

In order to achieve the above object, a pulsating airflow type powder mixing apparatus according to the present invention is characterized in that a mixer body has an upper part having a powder supply port and a lower part having a powder discharge port. It is formed into a rectangular cylinder, and is supplied to the powder supply port by intermittently blowing an airflow into the inside through a plurality of horizontal slits provided in a vertical direction on a pair of opposite side walls of the mixer body. In a pulsating airflow type powder mixing apparatus in which each powder vertically flowing down in a multilayer film form is shifted in the horizontal direction, and mixed as a whole while changing in a vertical waveform, the mixer body has a bottom surface having a horizontal width of a bottom surface. A multi-stage vibratory feeder for supplying powder, wherein a plurality of troughs having substantially the same shape are provided in upper and lower multi-stages so as to form an inverted staircase in which the front end in the transport direction of each trough sequentially protrudes forward as it goes to the upper stage; The respective troughs The conveying direction leading end located in the powder supply port side, and are installed so as to face a virtual vertical plane in the slotted side walls comprising a conveying direction leading edge of each trough.

In this pulsating air flow type powder mixing apparatus,
In particular, each powder supplied to the powder supply port of the mixer body,
It is an object of the present invention to make it possible to supply a thin film having a thickness most suitable for a mixing action by a pulsating air flow while forming the film into a multilayer film. That is, each powder as a raw material is quantitatively and continuously supplied to the rear end side of each trough in the multi-stage vibration feeder. Each supplied powder is conveyed to the trough tip while being spread on a plane in a direction orthogonal to the conveying direction on the trough, and falls into a film form from the trough tip, and the powder in the mixer body is It is supplied inside from the supply port. In this case, the powders falling from the tips of the troughs are provided in an inverted staircase shape in which the tips of the troughs in the transport direction protrude forward toward the top, so that they are structurally multilayered, and the powder in the mixer main body is formed. It is supplied to the body supply port.

[0007] The same operation as in the known pulsating air flow type is performed in the mixer body. For example, in the case of a mixer body similar to the above-described known pulsating airflow type mixing device, in the mixer body, air is blown from one of the opposed slits on the same plane, and air is blown from the other slit. Suction is performed, the direction of the air flow is reversed at regular intervals, and the direction of the air flow is controlled so as to be different in the vertically adjacent slits. By this control, the multilayer film-shaped powder supplied into the inside pulsates (forms a wave-like falling pattern) in a vertical waveform while being shifted in the horizontal direction from the vertical flow, and meshes with the adjacent other component powder. The mixing proceeds. In addition,
The gas blown from the slit is not limited to air, but may be an inert gas such as nitrogen gas.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a main part of a mixing apparatus to which the present invention is applied, FIG. 2 is a schematic external view of the apparatus partially cut away, FIG. 3 is a schematic view of the apparatus viewed from above,
FIG. 4 is a schematic diagram showing a circuit example of the air flow that is the pulsating air flow. The pulsating airflow type powder mixing apparatus 1 is mainly composed of a mixer body 3 in which a multi-stage vibration feeder 2 is incorporated on the upper side, and powders a and b as raw materials are supplied to respective troughs 4 of the multi-stage vibration feeder 2. On the other hand, it is supplied to the inside of the mixer body 3 while being supplied in a fixed amount while being developed into a multilayer film.

In the multi-stage vibration feeder 2, each trough 4 as a vibration conveying plate is incorporated in a holding frame 5 in a vertically stepped manner.
This is a structure that is vibrated by a vibrator 6 provided at a lower portion. As shown in FIG. 1, the holding frame 5 has a supply opening 6 a provided by notching a left portion on the upper surface 6 side,
And a discharge opening 7a provided by cutting out a right side portion on the bottom surface 7 side. Inside, four support plates 8 are provided at predetermined intervals between the bottom surface 7 and the upper surface 6, and the trough 4 is detachably mounted on each support plate 8. Each trough 4 has a flat bottom, the same width (direction orthogonal to the transport direction), and a vertical wall 4a provided at the rear end. In addition, each trough 4
Are arranged in multiple stages with respect to the support plate 8 of the holding frame 5, and are provided in such a manner that the leading end 4b in the transport direction projects in a reverse staircase projecting forward sequentially from the lowermost trough to the upper trough. I have. In this way, the troughs 4 are arranged in a regular staircase in which the front end 4b is arranged in a reverse staircase, so that the rear wall 4a on the rear end side is retracted forward as it goes upward.

The vibrator 6 has an oscillating means 10 disposed between two plates 9. If the vibrator 6 vibrates the entire multi-stage vibration feeder 2 at a predetermined frequency, a known electromagnetic type, Any type such as an electric type and a pneumatic type may be used. Further, as such a vibration system, it is possible to individually vibrate each trough 4 by a dedicated vibrator, but as in this embodiment, the entire multi-stage vibration feeder 2 is vibrated. When the structure is adopted, the structure and management can be simplified, and it is preferable to uniformly operate the trough 4.

On the other hand, the mixer main body 3 includes front and rear walls 3.
a, 3a and opposing side walls 3b, 3b to form a vertically long rectangular tube. The upper side is set to the supply port 11 in which one of the side walls 3b is cut out, and the lower side is set to the discharge part 12, so that the storage container 13 is put in and out of the opening 3c provided in the front wall 3a. I have. When the mixing device is incorporated as a part of the process, the powder flowing out of the discharge unit 12 is continuously sent to the next process.
Further, in the mixer body 3, the multi-stage vibrating feeder 2 is incorporated so as to be able to vibrate with respect to the supply port 11 in a state where the multi-stage vibratory feeder 2 is placed on the installation table 14.
1 and a virtual vertical surface including a trough tip edge is provided so as to face the side walls 3b, 3b.

In each of the side walls 3b, a plurality of slits 3d for both blowing and suction are provided vertically (four in this embodiment) at predetermined intervals.
Each slit 3d is a horizontal slit whose longitudinal direction is a horizontal direction or slightly inclined, is provided opposite to both side walls 3b, 3b, and is formed to have a length substantially equal to the width of the side wall 3b. And in the mixer body 3,
Air is blown into the inside, or conversely, the air inside is sucked out through the air chamber 15 provided on both side walls 3b, 3b and corresponding to each slit 3d. That is, the air chamber 15 has the air introduction pipe 16 and the air discharge pipe 17. Air introduction pipe 16
Is connected to an air source 18 as an air source via an electromagnetic valve 19, and sends air to the air chamber 15 side. The air discharge pipe 17 is connected to a suction means 28 as a vacuum source via an electromagnetic valve 19, and sucks the air chamber 15 side. In each slit 3d, a filtering member 20 is provided.
Are buried from the air chamber 14 side. The filter member 20 prevents the powders a and b from coming out through the slit 3d when sucking air from the inside.

The above pulsating airflow type powder mixing apparatus 1 of the present invention.
Is operated, the powders a and b, which are the raw materials, are supplied from a quantitative supply device (not shown) onto the rear end side of the corresponding trough 4 via the opening 6a. The supplied powders a and b on each of the troughs 4 are vibrated by the driving of the vibrator 6, and are moved or conveyed toward the tip 4 b side of the trough 4, and are flat or film-formed on each of the troughs 4. The tip 4b of the trough 4 is spread in a state of being a multilayer film.
From the mixer body 3 to the supply port 11 of the mixer body 3.

The inside of the mixing apparatus main body 3 is on the same horizontal plane, and air is blown into the inside from one of the opposed slits 3d, 3d by the air chamber 15, and conversely, from the other slit 3d (to the outside). The air is sucked, the direction of the air flow is reversed at regular intervals, and the direction of the air flow is controlled to be different in the slits 3d adjacent vertically. As a result, as shown by the imaginary line in FIG. 1, when each of the powders a and b is dropped in a state of being developed into a film, the powders a and b are corrugated by intermittent air blowing and suction through each slit 3d. It falls while forming a flowing pattern. For this reason, the different powders a and b dropped in the vertical direction are overlapped with each other, and the mixing proceeds, and reaches the discharge port 12 and accumulates in the storage container 13. In the embodiment of FIG. 1, the specific powder a shown by a circle is supplied to the even-numbered troughs 4 (the second and lowermost rows from the bottom) among the four levels, and the odd-numbered rows (the lowermost row and the lowermost 3) are supplied. This shows a situation in which another powder b indicated by X is supplied to the trough 4 in the (stage) and two kinds of raw materials are mixed.

In the above embodiment, if the number of the troughs 4 is two or more, any number of troughs can be provided, and different types of raw materials may be supplied to the respective troughs 4. In addition, in order to perform efficient mixing in the mixer main body 3, the number of the slits 3d, the width of the slits 3d, the width and length of the slits themselves, and the speed of the air flow, etc. It is needless to say that it is appropriately adjusted according to the properties and physical properties.

FIG. 5 shows a configuration example in which a guide plate is attached to the mixer main body in the same manner as in FIG. Therefore, parts other than the guide plate are denoted by reference numerals corresponding to those in FIG.

Five guide plates 30 are provided between the multi-stage vibrating feeder 2 and the powder supply port 11 to partition the film-like powders a and b falling from the leading end of each trough 4 in the transport direction. You are. Further, each guide plate 30 is attached to the front and rear walls 3a, 3a in a state where each guide plate 30 is inclined in a direction to decrease each interval between the powders a, b falling from each trough 4 downward. Each of these guide plates 30 is not essential,
It is preferable that the guide plate 30 be provided in order to sufficiently exhibit the mixing action of the pulsating airflow of the mixer body 3. Although each guide plate 30 may be arranged in parallel, as shown in FIG. 5, the mixing is performed by inclining the distance between the powders a and b falling from each trough 4 so as to decrease downward. Mixing within the vessel body can be facilitated. Further, the above specific example is an example in which air is blown from one slit 3d and the air is sucked from the other slit 3d facing each other on the same plane in the mixer body 3 at the same time. The present invention is not limited to this, and the air suction operation of the above specific example may be omitted, and the air blowing direction from the slit 3d may be set slightly downward or upward. As described above, the present invention can be further modified or developed on the basis of the essential parts.

[0017]

As described above, the present invention has the following functions and effects. In terms of the mixing mechanism, the multi-stage vibration feeder efficiently forms a multilayer film having a smaller thickness of each powder and supplies it to the mixer body, and the mixing action by the pulsating air flow in the mixer body And organically combined with each other. As a result, the pulsating airflow type powder mixing apparatus satisfies the mixing quality and can be mass-produced or industrially practicable. In terms of the apparatus structure, the novel multistage vibrating feeder for supplying powder is simply incorporated in a conventional pulsating airflow type mixer main body in a predetermined mode, so that the configuration is simple and the production is easy. In addition, the advantages of the pulsating air flow type, such as the absence of mechanically movable parts such as stirring blades, the abrasion resistance, excellent durability, and the small occupation area can be provided as they are.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a pulsating airflow type powder mixing apparatus to which the present invention is applied.

FIG. 2 is a schematic perspective view showing the mixing device with a part cut away.

FIG. 3 is a schematic diagram showing the mixing device as viewed from above.

FIG. 4 is a schematic diagram illustrating a circuit example of an airflow that is the pulsating airflow.

FIG. 5 is a schematic sectional view showing a modified example of the present invention in a state corresponding to FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulsating air flow type powder mixing apparatus 2 Multi-stage vibration feeder 3 Mixer main body 3a Front and rear wall 3b Side wall (opposite side wall) 3d Slit 4 Trough 4b Tip of trough (tip of trough conveyance direction) 6 Exciter 11 Supply of mixer body Mouth 12 Outlet of mixer body 30 Guide plate

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Rumio Fujii 1-6-1, Kanda Jimbocho, Chiyoda-ku, Tokyo Nisso Engineering Co., Ltd.

Claims (3)

[Claims] 1. The mixer body has an upper part as a powder supply port,
The lower part is formed in a substantially square cylindrical shape with a powder outlet, and the air flow is intermittently blown into the inside through a plurality of horizontal slits provided in a vertical direction on a pair of opposite side walls of the mixer body. In a pulsating air flow type powder mixing apparatus, each powder supplied to the powder supply port and vertically flowing down in a multilayer film form is shifted in the horizontal direction, and mixed while changing as a whole in a vertical waveform. The mixer body has a plurality of troughs for powder supply in which upper and lower multistage troughs are provided in such a manner that a plurality of troughs having substantially the same width at the bottom surface are formed in a reverse stair-like shape such that the front end of each trough sequentially projects forward as the leading end in the conveying direction goes upward. A vibrating feeder, wherein the multi-stage vibrating feeder is arranged such that a leading end of each trough in the conveying direction is located on the powder supply port side, and a virtual vertical surface including a leading end edge of each trough in the conveying direction is opposed to the side walls with slits Do Cormorants installation pulsating air current type powder mixing apparatus characterized by being. 2. A guide plate provided between the multi-stage vibrating feeder and a powder supply port of the mixer main body to partition film-like powders falling from a leading end of each of the troughs in a conveying direction. The pulsating airflow powder mixing apparatus according to claim 1, wherein 3. The pulsating airflow type powder mixing device according to claim 2, wherein the guide plate is inclined in a direction to decrease each interval between powders falling from each of the troughs downward.