JPH10114433A - Fine powder discharge device and fine powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine powder discharge device of simple construction which is easily built in an automated line, hardly causes clogging of powder, and is simple in cleaning and easy in maintenance even in the case of clogging of powder at the worst. SOLUTION: This fine powder discharge device 1 is constituted of a supply part 4 made by combining a straight cylinder 3 with the lower end of a conical hopper 2, a rotary shaft 5 arranged passing through the supply part 4, an impeller 6 provided on the circumferential face of the extreme end part on the straight cylinder side of the rotary shaft 5, and a disc 7 provided under the impeller 6 so as to be contacted with or approached to the impeller 6 and not combined with the impeller 6, and the impeller 6 is provided so that fine powder can be pushed out in the circumferential direction of the rotary shaft 5 by rotating together with the rotary shaft 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fine powder discharging device and a fine powder supplying device.

[0002]

2. Description of the Related Art Conventionally used powder feeders include a vibratory feeder using vibration, a table feeder using table rotation, a screw feeder using screw rotation, and a rotary blade using rotary blade. Type feeders are known.

[0003]

However, the above-mentioned supply device is often designed so as to function as a single device, and has a drawback that the structure is relatively complicated and it is difficult to incorporate it into an automation line. When the above-mentioned conventional supply device is incorporated into an automation line, the automation line is usually modified to match the supply device. However, if the automation line is modified, there is a problem that another trouble occurs.

[0004] Further, the above-mentioned conventional powder supply device itself has a problem. That is, when the powder supply device is operated, the powder adheres to the inside of the device, and it is often necessary to stop the device, or it becomes difficult to supply a fixed amount. Therefore, in order to avoid such a problem, it is necessary to periodically clean the apparatus, and it takes time and effort to maintain the apparatus.

[0005] For the reasons described above, a powder supply apparatus having a simple structure and a structure in which powder adhesion is unlikely to occur is desired. However, since the above-mentioned conventional powder discharging device has a complicated structure, it is difficult to incorporate the device into an automation line, and powder tends to adhere and clog the powder. In addition, there is a drawback that stable quantitative discharge of powder cannot be performed. Further, maintenance such as cleaning work for removing the powder clogged in the apparatus is troublesome, and the running cost is increased.

The present invention has been made in view of the above points, and solves the above-mentioned conventional disadvantages, is easy to incorporate into an automation line, is hard to cause powder clogging, and even if powder is clogged, It is an object of the present invention to provide a fine powder discharge device having a simple structure that is easy to clean and easy to maintain. Another object of the present invention is to provide a fine powder supply device capable of stably supplying a fixed amount of fine powder.

[0007]

According to the present invention, there is provided (1) a supply unit formed by connecting a straight cylinder to a lower end of a conical hopper, a rotating shaft disposed through the supply unit, and a straight cylinder of the rotating shaft. A fine powder discharging device comprising: a blade provided on a peripheral surface of a side tip portion; and a disc provided below the blade in a state in which the blade is not coupled to the blade. Is provided so that fine powder can be extruded in the circumferential direction of the rotating shaft by rotating together with the rotating shaft. (2) Along the rotating shaft in the supply unit. The fine powder discharge device according to the above (1), wherein the rotary shaft is provided with a blocking prevention member for preventing the fine particles from blocking the inside of the supply unit in a part or all of the directions, and (3) the upper end of the blade body And (1) or the gap between the lower end of the supply unit and the lower end is 1 mm or less. (2) fine powder supply apparatus according,
(4) A fine powder supply device characterized in that a discharge hopper is radially provided around a disk of the fine powder discharge device according to (1) to (3).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a fine powder discharging device according to the present invention, in which the internal mechanism is seen through. In the drawing, reference numeral 1 denotes a fine powder discharging device.

The fine powder discharging device 1 includes a conical hopper 2
Supply part 4 having a straight cylinder 3 coupled to the lower end of a rotary shaft, a rotary shaft 5 disposed at the center of the supply part 4, and a blade body provided on the peripheral surface of the tip of the rotary shaft 5 on the straight cylinder 3 side. 6 and a disk 7 provided in contact with or close to the blade body 6 and below the blade body 6 without being coupled to the blade body 6.

The blade body 6 is provided so that the fine powder can be extruded in the circumferential direction of the rotary shaft 5 by rotating together with the rotary shaft 5.

Although not shown, the rotating shaft 5 is rotatably supported by a suitable supporting means such as being pivotally supported by a bearing portion of a support base provided with a bearing. Further, even if the lower end of the rotating shaft 5 is in contact with the upper surface of the disk 7, or the disk 7 is provided with an insertion hole so that the lower end of the rotation shaft 5 is rotatable into the insertion hole so as not to form a gap into which fine powder enters. It may be in the state where it was done.

The disk 7 is fixed to a flange 8 provided on the straight cylinder 3 by a support member 9.

In the portion of the conical hopper 2 in the supply section 4, a blocking prevention member 10 for preventing the fine powder from blocking the inside of the conical hopper 2 is provided on the rotating shaft 5. The blocking prevention member 10 is usually provided with a stirring member 11 arranged along the inner surface of the conical hopper 2.
And the supporting portion 12 that couples the rotating shaft 5 with the supporting shaft 12. However, it is only necessary to prevent the conical hopper 2 from being blocked, and the present invention is not limited to such an embodiment.

Further, a blocking prevention member 13 similar to the above is provided also in the portion of the straight cylinder 3 in the supply section 4. Like the blockage prevention member 10, the blockage prevention member 13 also includes a stirring member 14 arranged along the inner surface of the straight cylinder 3 and a support portion 15 for connecting the stirring member 14 to the rotary shaft 5. However, it is not limited to such an embodiment.

By providing the blocking prevention members 10 and 13, it is possible to prevent a so-called bridge phenomenon in which the fine powder hardens and stops flowing in the supply section, and the fine powder can be smoothly discharged. Greatly contributes to quantitative discharge of fine powder.

FIG. 2 is an enlarged view of a main portion near the discharge section of the fine powder discharge device 1. In this figure, the hidden internal mechanisms are represented by dotted lines. FIG. 3 is a side view of the portion shown in FIG. The gap g between the upper end of the blade body 6 and the lower end of the supply section 4 is 1 mm or less, preferably 0.5 mm or less. The blade body 6 is usually sized so that the length between the tip of the blade body 6 and the rotation axis is equal to or larger than the radius of the three straight cylinders (hereinafter referred to as the radius of the blade body). Formed. Therefore, as shown in FIGS. 2 and 3, when the height (width) of the blade body 6 is constant, the blade body 6 is disposed below the lower end of the straight cylinder 3.

FIG. 4 is a side view showing the vicinity of a fine powder discharge portion showing another embodiment of the blade body 6. In the present invention, the blade body 6 is not limited to the above-described embodiment. The blade body 6 is not a plate having a constant height (width), but becomes narrower toward the circumference, and has a constant width at the lower end of the straight cylinder 3. It may be formed in a substantially triangular shape having a radius equal to or larger than the radius of the straight cylinder 3, and the upper part of the blade body 6 entering the straight cylinder 3.

A gap 16 is formed between the lower end of the three straight cylinders and the upper surface of the disk 7, and the fine powder extruded by the blade body 6 flows from the gap 16 to the outside of the disk 7. Is discharged.

The radius of the blade body 6 is preferably formed so as to be equal to or larger than the radius of the disk 7 disposed below the blade body 6. When the radius of the blade body 6 is smaller than the radius of the disk 7, the blade body 6 is extruded in the circumferential direction of the rotating shaft 5 (the direction of the arrow a in the drawing, ie, the direction of the rotation circumference of the blade body 6). The powder may remain on the edge of the disk 7 and the quantitative discharge of the fine powder may become unstable.

The height (blade width) h of the blade body 6 is arbitrary. In both the embodiment shown in FIG. 3 and the embodiment shown in FIG. 4, in the case where the blade 6 is provided such that the upper end of the blade 6 is lower than the lower end of the supply unit 4, the height of the blade 6 is high. H
Is approximately proportional to the amount of powder discharged per unit time. That is, when the other conditions are fixed, the blade body 6
If the height of the powder is doubled, the amount of powder discharged per unit time is also almost doubled.

The blades 6 are usually provided evenly. Although four blades 6 are provided in the drawing, the number of the blades 6 is arbitrary in the present invention.

The plane shape of the blade body 6 is arbitrary as long as it can extrude the fine powder in the circumferential direction of the rotating shaft 5 (the direction of arrow a in the figure) by rotating the blade body. , A blade-like shape used in a spiral pump. In addition, as shown in FIG. 5, a linear shape provided radially in a tangential direction to the rotation shaft 5 may be used. The amount of powder discharged per unit time can also be adjusted by selecting the planar shape of the blade body 6.

The number of revolutions of the blade body 6 per unit time is related to the amount of powder discharged per unit time. When other conditions are fixed, the powder discharge amount can be increased by increasing the rotation speed.

The height of the conical hopper constituting the supply section 4 and the diameters of the upper opening and the lower opening are arbitrary, as long as the conical shape is maintained.

The height and the diameter of the portion of the straight cylinder 3 constituting the supply section 4 are usually 80 to 100 m.
m, several tens mm to several hundred mm, but not limited to this. The diameter of the portion of the straight cylinder 3 directly affects the discharge amount, and the discharge amount increases as the diameter increases.

In the present invention, the particle size of the fine powder is not particularly limited, but if the particle size is 10 μm or less, the device of the present invention can surely discharge a fixed amount and can be suitably applied to the present invention. .

Since the fine powder discharging device of the present invention has the above-mentioned simple structure, there is little problem of powder adhesion in the device, and the inside can be easily cleaned even if powder adheres. Running costs can be reduced.

The fine powder discharging device of the present invention can be applied as a single unit to a fine powder supply device in, for example, a shot blasting device or the like. It can also be incorporated and used as a supply section of the device.

Next, the fine powder supply device of the present invention will be described. FIG. 6 is a schematic diagram illustrating an example of the fine powder supply device. In the figure, reference numeral 18 denotes a discharge hopper.

The fine powder supply device 17 includes a plurality of discharge hoppers 18 radially around the disk of the fine powder discharge device 1.
Is provided. With this configuration, it is possible to supply a plurality of supplies at an arbitrary supply amount by using only one fine powder discharge device. For example, an air blast apparatus for surface processing of metal or the like often uses a plurality of nozzles, and in this case, a single fine powder (blast material) supply unit can be used. Incidentally, the number of discharge hoppers may be one.

[0031]

Next, the operation of the fine powder discharging device of the present invention will be described with reference to FIG. FIG. 7 is a diagram illustrating the operation of the blade body 6 as viewed from the direction of the section plane AA in FIG. 1. In the fine powder discharging device 1, the bridge is prevented by the blocking prevention member in the supply unit 4, and the fine powder is smoothly supplied to the three straight cylinders. Within the three straight cylinders, the density of the powder is kept substantially constant. For this reason, even if the amount of powder in the conical hopper 2 changes, the pressure in the straight cylinder 3 does not change, and the amount of powder discharged from the straight cylinder 3 does not change.

As described above, from the straight cylinder 3, the blade 6
Is supplied to the periphery of the circular plate 7, and the fine powder is pressed against the disk 7 by a constant pressure from the straight cylinder 3. Therefore, in this state, the fine powder is slightly compressed, and the density of the fine powder is uniform [FIG. 7 (a)]. Here, when the rotary driving device attached to the rotary shaft 5 is driven to rotate the blade body 6, the fine powder 19 filled around the blade body 6 becomes:
The rotation of the blade body 6 causes the liquid to be sent out to the outer periphery of the disk 7 on the same principle as that of the spiral pump used for transporting the liquid. At this time, when the fine powder is extruded by the blade body 6, the fine powder is further subjected to a slight compressing action, and its density becomes more uniform [FIG. 7 (b)].

When the blade body 6 rotates continuously, the plane shape, the number and the height h of the blade body 6 according to the rotation angle (when the upper end of the blade body 6 is lower than the lower end of the straight cylinder 3). A fine powder having a corresponding volume is discharged to the outside of the disk 7 (in the direction of the arrow a at the position of the blade body in the figure) [FIG. 7 (c)]. As described above, the fine powder is stably discharged to the outside of the disk 7 in an amount corresponding to the rotation speed of the blade body 6 and the planar shape, the number of the blades, and the height. And since the density of the fine powder at the time of discharge is uniform, a quantitative discharge property can be obtained even by weight, and a strict quantitative discharge property can be obtained.

[0034]

Next, the present invention will be described in more detail with reference to specific examples. The following fine powder discharging device was manufactured.
The diameter of the upper opening of the conical hopper is 150 mm, the inner diameter of the lower opening is 32 mm, the vertex angle is 30 °, and the height of the straight cylinder is 80 m.
m, inner diameter of straight cylinder 32 mm, outer diameter of straight cylinder 38 mm
At the lower end of the rotating shaft disposed through the supply section, four blades having a planar shape shown in FIG. 7 and having a height of 4 mm were provided as shown in FIG. The gap between the upper end of the blade body and the lower end of the straight cylindrical portion was 1.0 mm. The diameter of the part including the blade body including the blade body was 40 mm (radius of the blade body: 2).
0 mm). A disk having a diameter of 38 mm was arranged directly below the blade body. The disk was fixed to the straight cylinder via a flange provided on the straight cylinder and a support member attached to the flange. The gap between the disc and the straight cylinder was 5 mm. The rotation axis of the motor was connected to the rotation axis. The motor was equipped with a speed controller.

Using the above-mentioned fine powder discharging device, a fine powder of White Morundum # 2000 (average particle size of 7.9 μm) was obtained.
m) and White Morundum $ 4000 (average particle size of 3.
0 μm), and a discharge characteristic of the fine powder with respect to the rotation speed was measured.

FIG. 8 is a graph showing the discharge characteristics of the fine powder with respect to the rotation speed. The vertical axis is the emission amount (g / sec),
The horizontal axis represents the rotation speed (rpm) of the blade body. As shown in FIG. 8, it can be seen that the discharge amount is controlled almost directly proportionally by the rotation speed of the blade body.

FIG. 9 shows the specific rotation speed (60 rpm) of the fine powder.
10 is a graph showing a variation rate (%) of the discharge amount at a certain time interval in m). The fluctuation rate for each measurement is shown with respect to the average value of the discharge amount (g / sec) when the measurement is performed 10 times every 5 seconds. The vertical axis represents the fluctuation rate (%), and the horizontal axis represents the number of measurements (the number of times). As shown in FIG. 9, the variation of the emission amount due to the change of the measurement time is small, and the emission amount is almost constant even when the measurement is performed, and the emission amount is stable over time. You can see that it is. That is,
It can also be seen that even if the amount of fine powder in the supply section decreases over time, it is not affected by the decrease.

[0038]

Since the fine powder discharging device of the present invention is constructed as described above and has a simple structure, the fine powder is hardly clogged in the device, and stable quantitative discharge of the fine powder is possible. In addition, the present invention is an industrially significant invention that can be easily cleaned even if fine powder is attached or clogged, maintenance of the device is easy, and running costs can be greatly reduced. In addition, since the structure is simple, it is easy to incorporate it into existing shot blasting lines and automated lines such as cyclones, so there is no need to modify the automated lines. It is possible to prevent various secondary problems such as processing defects resulting from the occurrence. Further, when a plurality of hoppers are provided in the above-mentioned apparatus to supply fine powder to a plurality of apparatuses to be supplied, only one supply apparatus is required, and there is an effect that the apparatus cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an internal mechanism showing an example of a fine powder discharging device according to the present invention as seen through.

FIG. 2 is an enlarged view of a main part showing the vicinity of a blade body of the apparatus of FIG.

FIG. 3 is a side view of a portion shown in FIG. 2;

FIG. 4 is an enlarged side view of a main part in the vicinity of a fine powder discharge part, showing another mode of the blade body.

FIG. 5 is a plan view showing another example of the shape of the blade body.

FIG. 6 is a schematic diagram illustrating an example of a fine powder supply device.

FIG. 7 is a wing body 6 viewed from the direction of the section plane AA in FIG. 1;
It is a figure which shows the effect | action of.

FIG. 8 is a graph showing discharge characteristics of the fine powder obtained by using the fine powder discharge device of the present invention shown in the embodiment, and is a graph showing the relationship between the rotation speed of the blade body and the discharge amount of the fine powder. is there.

FIG. 9 is a graph showing the discharge characteristics of the fine powder obtained by using the fine powder discharge device of the present invention shown in the embodiment, and is a graph showing the relationship between the measurement time and the variation rate of the discharge amount of the fine powder. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fine powder discharge device 2 Conical hopper 3 Straight cylinder 4 Supply part 5 Rotating shaft 6 Blade body 7 Disk 10, 13 Blocking prevention member 17 Fine powder supply device 18 Discharge hopper 19 Fine powder

Claims (4)

[Claims] 1. A supply unit formed by connecting a straight cylinder to a lower end of a conical hopper, a rotation shaft disposed through the supply unit, and a blade body provided on a peripheral surface of a front end of the rotation shaft on a straight cylinder side. And a disk below the blade body and provided in a non-coupled state with the blade body, wherein the blade body rotates together with a rotating shaft to form a fine powder. Characterized in that the fine powder discharging device is provided so as to be able to extrude in the circumferential direction of the rotating shaft. 2. A blockage preventing member for preventing blockage of the supply unit by fine powder is provided on the rotation shaft in a part or all of a direction along the rotation axis in the supply unit.
The fine powder discharging device according to the above. 3. The fine powder supply device according to claim 1, wherein a gap between an upper end portion of the blade body and a lower end portion of the supply portion is 1 mm or less. 4. A fine powder supply device comprising: a discharge hopper provided radially around a disk of the fine powder discharge device according to claim 1.