JP7190223B1 - duster - Google Patents

Abstract

A powder remover for removing fine particles and other objects from materials is provided. The duster includes a filter, a feed port, and a suction port located vertically below the feed port, the filter being vertically downwardly inverted conical and having an inner surface for receiving the input. Then, a vortex in which the thrown object flows in the horizontal direction is formed on the inner surface in a first direction X1 that is vertically upward with respect to the horizontal direction from downward, and the width in the first direction is orthogonal to the first direction The hole has a shape longer than the height in the second direction X2, and the first angle AG1, which is the angle formed by the first direction with respect to the horizontal direction, is 5 degrees to 30 degrees, and generates an upward component in the vortex When the input is supplied from the supply port, it flows spirally on the inner surface due to the suction from the suction port and gravity, and the supply port and the suction port are in a positional relationship with a horizontal offset, and the width is 25 to 50 millimeters, the height is less than 3 millimeters, and the suction port has a back flow to the vortex. [Selection drawing] Fig. 4

Description

The present invention relates to dusters.

Techniques for removing impurities contained in materials used in molding machines and the like before they are supplied to molding machines and the like are known.

For example, a fine powder removing device using a porous filter is known for removing fine particles from a granular material. Specifically, the filter includes a guide that guides the air-fuel mixture spirally flowing along the inner wall of the filter from a direction closer to the direction perpendicular to the central axis to the direction perpendicular to the central axis than in the free flow direction. Alternatively, a long hole is formed in the filter in a direction perpendicular to the central axis to guide the air-fuel mixture spirally flowing along the inner wall of the filter in a direction perpendicular to the central axis rather than in a free flow direction. A technique for increasing the residence time of the air-fuel mixture in this manner is known (see, for example, Patent Document 1).

Also known is a dust collector that separates granules from a mixture of liquid powder and air. Specifically, the powder removing device includes a filter having elongated filter holes arranged along the flow of the air-fuel mixture spirally flowing along the inner wall surface. With such a filter, objects smaller than the width of the filter holes pass through the filter and are discharged together with the air from the air suction port. A technique is known in which the air-fuel mixture is allowed to stay on the filter surface for a long time to efficiently separate powdery, fibrous, or rod-like substances from granules (see, for example, Patent Document 2).

Japanese Patent No. 5736142 Japanese Patent No. 4810554

The conventional technique has a problem that objects such as fine powder mixed in the material cannot be sufficiently removed.

The present invention is intended to remove more fine particles and other objects from materials than the prior art.

In order to solve the above problems, in one aspect of the present invention, a duster that separates materials and objects from an input containing the objects and is equipped with a filter comprises:
a supply port;
a suction port located below the supply port in the vertical direction,
The filter is
said vertically inverted conical shape;
an inner surface for receiving the input;
A vortex in which the thrown object flows is formed on the inner surface in a first direction that is vertically upward with respect to the horizontal direction from downward to the horizontal direction, and the width in the first direction is greater than the first direction a shape longer than the height in a second direction perpendicular to the vortex, and the first angle formed by the first direction with respect to the horizontal direction is 5 degrees to 30 degrees, and an upward component is generated in the vortex and a hole for
The input is
When supplied from the supply port, it spirally flows on the inner surface due to suction from the suction port and gravity,
The supply port and the suction port are
a positional relationship with an offset in the horizontal direction;
the width is between 25 and 50 millimeters;
the height is no greater than 3 millimeters;
A reverse flow to the vortex flow is generated at the suction port.

According to the present invention, objects such as fine powder can be removed more effectively from the material.

It is a figure which shows the usage example of the dusting machine 100. FIG. FIG. 2 is a diagram showing an example of a duster 100; It is a figure which shows the external appearance of the filter 103 of a 1st example. It is a figure which shows the 1st example of a hole. FIG. 10 is a diagram showing the appearance of a filter 103 of a second example; It is a figure which shows the 2nd example of a hole. It is a figure which shows the external appearance of the filter of a comparative example. It is a figure which shows the cross section of the filter of a comparative example. It is a figure which shows the cross section of the filter 103 of a 1st example or a 2nd example. FIG. 10 is a diagram showing an example of bridge occurrence; FIG. 5 is a diagram showing an example of backflow caused by a gap; FIG. 10 is a diagram showing an example of backflow caused by inert gas; It is a figure which shows the 1st modification of a hole. It is a figure which shows the 2nd modification of a hole. It is a figure which shows the 3rd modification of a hole.

A specific example will be described below with reference to the accompanying drawings.

Hereinafter, the object used by the molding machine is referred to as "material". The main component of the material is resin. The virgin material is, for example, cylindrical with a diameter of about 3 mm and a length of about 3 mm. A material having such a shape will be described below as an example. However, the material may have other shapes and other sizes. For example, there are materials with various particle sizes and shapes, such as pulverized materials. Therefore, it is desirable that the dimensions and the like shown in the following examples are values that match the shape, size, and the like of the material.

In addition, the material may be mixed with objects other than the material. Hereinafter, an object that mixes with a material is simply referred to as an "object". The object is, for example, fine powder or pulverized powder. Also, the object may be of a type other than powder. For example, it may be fibrous. If objects are mixed during molding by a molding machine, the molded product may become defective. Defects include, for example, a phenomenon in which white spots or black spots are formed in the molded product, or contamination with foreign matter. Therefore, the object may be of any type as long as it causes defects in molding by the molding machine. An example in which the object is powder will be described below.

Furthermore, in the following description, the mixture containing materials and objects, ie before separation by a filter, is referred to as "input".

[Example of dust remover]
FIG. 1 is a diagram showing an example of use of the dust remover 100. As shown in FIG. Hereinafter, the vertical direction will be referred to as the "Z-axis direction". That is, when the material is put in, it falls in the Z-axis direction indicated by the arrow in the powder remover 100 due to gravity. Also, the circumferential direction of the dust remover 100 is defined as the "X-axis direction". Further, the direction corresponding to the depth of the pulverizer 100 is defined as the “Y-axis direction”.

Duster 100 is installed, for example, in connection with material hopper 101 as shown. The material hopper 101 also connects to the molding machine 102 . That is, the powder remover 100 separates the powder from the input material by the filter 103 before it is input to the material hopper 101 .

An input material is input from the supply port 104 . The inner wall of the filter 103 receives the input from the supply port 104 . Filter 103 then separates the powder from the input and supplies the material to material hopper 101 .

Note that the dust remover 100 may be used in a configuration other than that illustrated. For example, the powder remover 100 may be used by being connected to a device other than the material hopper 101, or the powder remover 100 may be used alone.

The duster 100 also desirably has a suction port 105 located vertically below the supply port 104 . Then, the air inside the powder remover 100 is sucked from the suction port 105 . That is, an aspirator or the like is connected to the suction port 105 .

It is desirable that the supply port 104 and the suction port 105 have a positional relationship with an offset in the horizontal direction. Specifically, in the illustrated example, the supply port 104 is located on the right side of the central axis. On the other hand, the suction port 105 is on the left side of the central axis. Thus, it is desirable to have an offset. Note that if there is an offset, the supply port 104 and the suction port 105 may be arranged in the opposite direction from the drawing.

Thus, when the supply port 104 and the suction port 105 are arranged with a horizontal offset, the suction from the suction port 105 causes the input material to rotate, that is, to create a vortex flow. Furthermore, gravity causes the input to fall. Therefore, duster 100 can spirally flow the input material on the inner surface by vortex and gravity.

Also, the object is ejected to the outside from, for example, the suction port 105 or the like. The ejected objects are collected by, for example, a dust filter or the like provided in the dryer main body.

FIG. 2 is a diagram showing an example of the powder remover 100. As shown in FIG. The upper drawing is a view looking down on the dust remover 100 from above. The middle drawing is a front view of the dust remover 100 . Furthermore, the lower figure is the figure which looked up the dust removing machine 100 from the bottom.

As illustrated, the filter 103 is installed inside the powder remover 100 . Also, the diameter of the filter 103 is determined according to the size of the powder remover 100 and the like. It should be noted that the filter 103 preferably has a larger diameter. And if the diameter is large, the speed at which the input material decelerates can be suppressed. In this way, maintaining a high swirling speed of the charge allows more powder to be separated from the charge.

In addition, the filter 103 may be integrated with the powder remover 100, or may be configured to be attachable to and detachable from the powder remover 100. FIG.

[First example of hole]
FIG. 3 is a diagram showing the appearance of the filter 103 of the first example. As shown, the filter 103 has a reverse conical shape in the Z-axis direction. Therefore, the filter 103 has a shape in which the supply port 104 has a larger diameter. And the filter 103 is provided with the following holes, for example.

FIG. 4 is a diagram showing a first example of a hole. For example, holes are formed in the filter 103 as shown in FIG. 4(A). As shown in FIG. 4(A), the hole is formed in part or the entire surface of the filter 103 . As long as the holes are formed between the supply port 104 and the suction port 105 in the vertical direction, the number and arrangement of the holes may be other than those shown in the drawings.

Hereinafter, description will be made with reference to FIG. 4(B) by enlarging the hole portion in FIG. 4(A).

The hole is formed in the inner surface of the filter 103 in a direction angled vertically upward with respect to the horizontal direction (hereinafter referred to as "first direction X1"). In the following description, it is assumed that the thrown object flows in the direction indicated by the arrow (hereinafter referred to as "vortex direction 200").

Hereinafter, the horizontal direction is indicated by "horizontal axis X0". For example, the first direction X1 forms an angle of about 10 degrees vertically upward with respect to the horizontal direction. Hereinafter, the angle formed by the first direction X1 with respect to the horizontal axis X0 is referred to as "first angle AG1". A direction orthogonal to the first direction X1 is called a "second direction X2".

The holes are preferably angled to direct the vortex upward. That is, the first angle AG1 is not the direction along the vortex direction 200 (the lower right direction in the drawing), but the angle that makes the vortex flow upward (the upper right direction in the drawing).

With such holes, the filter 103 is better able to remove fine particles and other objects from the material.

Preferably, the first angle AG1 is 5 to 30 degrees. Further, it is more desirable that the first angle AG1 is an angle close to the horizontal of 10 degrees or less.

Further, the hole has a shape that is longer in the first direction X1 than in the second direction X2. Hereinafter, the dimension of the hole in the first direction X1 is referred to as "width L1". On the other hand, the dimension of the hole in the second direction X2 is called "height L2".

For example, width L1 is 25 millimeters. On the other hand, the height L2 is 2 millimeters. Note that the dimensions of the width L1 and the height L2 may be values other than those described above.

The dimension of height L2 is preferably smaller than the material. In this example, the diameter of the material is 3 millimeters, so the dimension of height L2 is preferably 3 millimeters or less. Therefore, the dimension of the height L2 is determined according to the size of the material and the like.

The dimension of the width L1 is preferably about 25 to 50 millimeters in the first direction X1. However, the dimension of the width L1 is determined according to the diameter of the filter 103 and the like.

On the other hand, the longer the dimension of width L1, the more easily the durability of filter 103 decreases. That is, if the width L1 is too long, the strength of the filter 103 tends to decrease. Also, if the width L1 is too long, the height L2 of the filter 103 will be deformed, making it difficult to manufacture.

Therefore, if the dimension of the width L1 is about 25 millimeters, the filter 103 can be made more durable and easier to manufacture.

[Second example of hole]
FIG. 5 is a diagram showing the appearance of the filter 103 of the second example. An example using the same filter 103 as in the first example will be described below. The second example differs from the first example in the shape of the hole formed in the filter 103 . The filter 103 has, for example, holes as follows.

FIG. 6 is a diagram showing a second example of the hole. For example, holes are formed in the filter 103 as shown in FIG. 6(A). Hereinafter, the hole portion in FIG. 6(A) will be enlarged, and FIG. 6(B) will be described as an example.

The hole has a shape having a first portion P1 and a second portion P2.

The first portion P1 is formed horizontally. Note that the first portion P1 may be formed mainly in the horizontal direction, and may not be formed completely in the horizontal direction due to manufacturing errors or the like.

The second portion P2 is formed on the inner surface at a different angle than the first portion P1. Hereinafter, it is assumed that the first portion P1 is formed in a direction that coincides with the horizontal axis X0. The second portion P2 is formed at an angle of "second angle AG2" with respect to the horizontal axis X0.

The second angle AG2 is, for example, 10 degrees or less.

As described above, the filter 103 has holes in two or more directions by combining the first portion P1 and the second portion P2. With such holes, the filter 103 is better able to remove fine particles and other objects from the material.

The first portion P1 is preferably longer than the second portion P2. That is, it is desirable that the hole has more first portions P1 that include more horizontal components. In the case of a hole formed with a plurality of slopes in this way, if there are many horizontal components, the filter 103 can separate objects well.

[Comparative example]
FIG. 7 is a diagram showing the appearance of a filter of a comparative example. The comparative example differs from the first example or the second example in the shape of the hole. As illustrated, in the comparative example, the shape of the hole is a round hole.

FIG. 8 is a diagram showing a cross section of a filter of a comparative example. Hereinafter, the filter of the comparative example will be described in cross section (a cross section on the XY plane).

When there is a vortex, the material 300 always tries to move in the direction indicated by the arrow (tangential direction) due to inertial force.

Here, if the hole is a round hole, there is a low possibility that the object will be ejected from the hole. Specifically, in the comparative example, the proportion of the inner wall portion (the hatched portion in the drawing) to the hole portion (the white portion in the drawing) is high. Therefore, there is a high possibility that the object will hit the inner wall and not be ejected.

On the other hand, the above first example or second example is as follows.

FIG. 9 is a diagram showing a cross section of the filter 103 of the first example or the second example. The first example or the second example has a higher proportion of holes than the comparative example. Therefore, the filter 103 can separate objects well.

The filter 103 of the first example or the second example can increase the removal rate by several tens of percent compared to the filter of the comparative example. Note that the removal rate varies depending on the conditions.

Further, when the holes are formed in the direction as in the first example or the second example, the flow of the input material (in the vortex direction 200) can be disturbed. In this way, when turbulence occurs in flowing the thrown-in material, the thrown-in material is likely to be subjected to a shock. Then, when the impact is moderately applied, the filter 103 can separate the object from the input more effectively. For example, when powder adheres to a material due to static electricity or the like, the powder often falls off with a certain amount of impact. Therefore, the first example or the second example can increase the object removal rate.

If the thrown matter is guided in a direction other than the vortex direction 200, specifically in a direction in which the vortex in which the thrown matter flows is directed upward, the time that the thrown matter stays inside the filter 103 can be lengthened.

In addition, when the holes are formed in the direction as in the first example or the second example, the following effects are produced.

FIG. 10 is a diagram showing an example of bridge generation. In the comparative example and the like, bridging is likely to occur as shown in the figure. Specifically, bridging (the area enclosed by the dashed line is an example of bridging) is a phenomenon in which the material remains at the bottom of the filter 103 and is difficult to discharge.

Such a phenomenon occurs due to, for example, the following air flow.

FIG. 11 is a diagram showing an example of backflow caused by a gap. For example, in the device configuration as shown in FIG. 1, a gap 301 may occur in the molding machine 102 or the like. If there is such a gap 301, outside air or the like flows in the direction indicated by the arrow in addition to normal air flow while suction is being performed from the suction port 105. As shown in FIG. That is, the outside air enters from the gap 301 and flows through the molding machine 102, the dusting machine 100, and the like in a direction opposite to the flow of the material.

FIG. 12 is a diagram showing an example of backflow caused by inert gas. In order to reduce oxygen and the like in the screw of the molding machine, inert gas may be injected, for example, from the position shown. An inert gas is, for example, nitrogen or the like. When the inert gas is injected in this manner, the inert gas flows in the direction indicated by the arrows, i.e., in the direction opposite to the flow of the material through the molding machine 102, duster 100, etc. .

Therefore, if there is a gap 301 or injection of an inert gas, etc., the material flows through the molding machine 102, the dusting machine 100, etc. due to reverse flow (mainly upward direction in FIGS. 11 and 12). The direction (mainly the downward direction in FIGS. 11 and 12) is interrupted. That is, the reverse flow creates a force that pushes the material up.

Such forces create resistance to the flow of the material and cause the material to pool, for example, at the bottom of the filter 103 . As a result, it causes bridging.

Especially at bottleneck locations, such as the bottom of the filter 103, both air and material concentrate. Therefore, bridging is likely to occur in such materials and in locations that become bottlenecks where the area through which air can pass is narrow.

The air due to the backflow gathers at the bottleneck point, so the pressure tends to be high. Therefore, at the bottleneck point, the resistance due to the reverse flow of the material tends to be particularly large.

Therefore, if the flow of material can be disturbed as in the first or second example, a certain amount of material will resist the flow, making it difficult for the material to concentrate in the lower portion of the filter 103 or the like. In particular, when a plurality of holes are formed on the inner surface of the filter 103, disturbance can be generated at various positions of the filter 103. FIG. Therefore, it is possible to prevent the density of the material from increasing.

Therefore, the use of the filter 103 having holes as in the first example or the second example makes it difficult for bridging to occur.

Furthermore, if bridging is less likely to occur, the discharge port for discharging the material can be made smaller. If the outlet can be made smaller, the inner surface of the filter 103 can be made less inclined. If the inclination of the inner surface of the filter 103 can be made small, the amount of time that the material stays inside the filter 103 can be lengthened. As a result, the filter 103 can separate objects better.

[Modification]
The hole may have, for example, the following shape.

FIG. 13 is a diagram showing a first modification of the hole. Compared to FIG. 6, it differs in that the second portion P2 is oriented in the upper left direction.

FIG. 14 is a diagram showing a second modification of the hole. Compared to FIG. 6, the arrangement of the first portion P1 and the second portion P2 is left-right reversed.

FIG. 15 is a diagram showing a third modification of the hole. Compared to FIG. 6, it differs in that the ratios of the first portion P1 and the second portion P2 are different.

[Other embodiments]
The holes are formed according to the direction in which the material is flowed. Specifically, in FIG. 4 and the like, the material spirally flows from the upper left to the lower right, but may flow from the upper right to the lower left. In such a case, the hole is formed in a shape that is bilaterally symmetrical with respect to the orientation described above.

Note that the holes do not have to all have the same shape. That is, the holes may have a mixture of different shapes.

The filter 103 is made of utility metal or the like. For example, the filter 103 is desirably made of stainless steel, iron, or a practical metal such as titanium.

It should be noted that the present invention is not limited to the embodiments illustrated above, and various modifications are possible without departing from the technical gist thereof, and are included in the technical idea described in the claims. All of the technical matters that are described are covered by the present invention. Although the above embodiment shows a preferred example, a person skilled in the art can realize various modifications from the disclosed contents. Such modifications are also included in the technical scope described in the claims.

100: Pulverizer 101: Material hopper 102: Forming machine 103: Filter 104: Supply port 105: Suction port 200: Eddy direction 300: Material 301: Gap AG1: First angle AG2: Second angle L1: Width L2: Height Height P1: first portion P2: second portion X0: horizontal axis X1: first direction X2: second direction

Claims (2)

A duster for separating materials and objects from an input containing said objects, comprising a filter, comprising:
a supply port;
a suction port located below the supply port in the vertical direction,
The filter is
said vertically inverted conical shape;
an inner surface for receiving the input;
a hole formed in a first direction having an angle of 5 degrees to 30 degrees with respect to the horizontal direction and formed in the inner surface ;
The input is
When supplied from the supply port, it spirally flows on the inner surface due to suction from the suction port and gravity,
The supply port and the suction port are
a positional relationship with an offset in the horizontal direction;
The hole is
A shape in which the width is longer than the height in the second direction, which is a direction orthogonal to the first direction,
The first direction is not the direction along the vortex,
the width is between 25 and 50 millimeters;
the height is no greater than 3 millimeters;
A powder remover in which a reverse flow to the vortex flow due to outside air is generated at the suction port. The material is
is a resin,
The object is
A powder smaller than the material,
The hole is
2. Dust remover according to claim 1, formed between said feed port and said suction port in said vertical direction.

Images