JPH07115748B2 - Particle feeder - Google Patents

Description

The present invention relates to a particle supply device for continuously supplying particles,
In particular, the present invention relates to a particle supply device whose supply amount can be easily controlled.

[Prior art]

BACKGROUND ART Conventionally, in a durability test of an engine or the like, a particle supply device is used for the purpose of, for example, continuously spraying granular particles onto a predetermined portion of an engine to test its strength.
In such a particle feeder, for example, as shown in FIG. 5, a screw feeder 2 is provided in the lower part of a hopper 1 to which particles are fed, a screw feeder 2 is driven by a motor 3, and a duct 4 is provided at the outlet thereof. A high-pressure air is supplied via a feeder to supply particles continuously to a predetermined area, or as shown in FIG. 6, a rotary disk 6 is provided under the hopper 5 to provide particles on the disk. There is known a feeding device of a table feeder method in which the particles are rotated and placed, and a rotary roller 7 provided in the middle of the rotation makes the particle thickness on the disk constant, and then scrapes the particles by a scraper 8 to feed the particles.

[Problems to be solved by the invention]

However, in such a conventional particle feeder, it is difficult to stably and accurately control the particle feeding rate. That is, according to the first method using the screw feeder, even when the motor 3 is stopped, the screw feeder 2
The particles are discharged from the tip of the feeder for a certain period of time, and even if the motor 3 is driven again, it takes a certain amount of time until the particles conveyed through the feeder reach the tip, and when the particle feeding speed is low, the particles are stably fed. There was a problem that I could not do it. Further, it has been difficult to control the particle supply speed by accurately corresponding to the rotation speed of the motor.

According to the second table feeder method described above, there is no problem when the particle diameter is several tens of μm or less, but when supplying particles larger than that, there is a risk that the particles will be crushed by the roller 7 in FIG. However, there is a problem that it is difficult to make the particle thickness on the disk constant.

The present invention has been made in view of the problems of such a conventional particle supply device, and can continuously and stably supply particles at an arbitrary supply speed, and further, the supply speed is low. It is a technical subject to be able to arbitrarily set up to, and to supply even granular particles without crushing the particles.

[Means for solving problems]

The present invention is a particle supply device for continuously supplying particles, and as shown in FIGS. 1 and 2, a chamber that holds particles that have been charged to a certain surface, and that supplies particles to the chamber. A hopper and an annular body which is rotatably attached along an axis arranged at a predetermined angle with respect to the vertical direction, and is arranged so that the lower part is embedded in the particles of the chamber and the upper part is exposed from the particle surface. A feeder ring having an annular groove on the upper surface, a motor for rotating the feeder ring, a speed control means for controlling the particle supply speed by changing the rotation speed of the motor, and an upper groove exposed from the particle surface of the feeder ring. And a suction means for sucking particles conveyed along the groove of the feeder ring, the duct including a suction hole disposed so as to face each other. It is.

[Action]

According to the present invention having such characteristics, the feeder ring tilted at a certain angle from the vertical direction is rotatably held in the chamber, the lower part of the feeder ring is embedded in the particles of the chamber, and the upper part is exposed from the particle surface. ing. Since the groove is formed on the upper surface of the feeder ring, when the feeder ring is rotated, the particle is mounted in the annular groove, so that the particle can be conveyed by the feeder ring. Then, a suction hole of a suction duct is provided so as to face the upper surface of the feeder ring which is exposed from the particle surface, and the conveyed particles are sucked by the suction means and supplied to a predetermined area. The rotation speed of the motor can be arbitrarily set by the speed control means.

[Explanation of Examples]

(Configuration of Embodiment) FIG. 1 is a configuration diagram showing the overall structure of a particle supply apparatus according to an embodiment of the present invention. The particle supply device according to the present invention has a cylindrical chamber 11 for holding particles, and a hopper 12 for supplying particles is attached to the upper part thereof. The chamber 11 is fixed while being inclined at a predetermined angle θ, for example, 25 ° from the vertical direction. The hopper 12 continuously supplies particles into the chamber 11. As shown in the partially cutaway perspective view of FIG. 2 at the lower end of the hopper 12, there is provided a supply duct 13 having a cut end 13a that is inclined so that the lower surface of the hopper 12 is horizontal so that the lower surface of the chamber 11 is inclined when the chamber 11 is inclined. Installed. Then, the particle surface in the chamber 11 is determined by the position of the cut end 13a. Well chamber
A motor 14 and a reduction mechanism 15 are fixed to the upper part of 11. A feeder ring 18, which is rotatably held by a bearing 17 provided in the chamber 11, is attached to a rotation shaft 16 of the speed reduction mechanism 15. The feeder ring 18 has an annular body structure connected to the rotary shaft 16 by cross-shaped spokes 19, and has an annular groove 18a on the upper surface as shown in the enlarged sectional view of FIG. Further, since the chamber 11 itself is tilted by a predetermined angle, the feeder ring 18 is also tilted by an angle θ from the vertical direction, as shown in the figure, it is buried in the particles supplied from the hopper below and exposed from the particle surface above. is doing.

Assuming that the particles to be supplied have the center of the particle size distribution as particles having a major axis of 0.8 mmφ and a minor axis of 0.4 mmφ (particles of the first group), they are provided on the upper surface of the feeder ring 18 shown in FIG. The groove width d of the formed groove 18a is preferably approximately 1 mm, which corresponds to the major axis of the particles. Particles supplied in the same way have a long diameter of 2 mmφ and a short diameter of 1 mmφ at the center of the particle size distribution.
It is preferable that the groove width d of the feeder ring 18 is 2 mm. In the following description, the feeder rings having the groove widths d of 1 mm and 2 mm are 18-1 and 18-2, respectively.

Now, at the uppermost portion exposed from the particle surface of the feeder ring 18, the suction holes 2 are provided at positions facing the grooves 18a of the feeder ring 18.
A suction duct 20 having 0a is provided. The suction duct 20 sucks particles to the ejector 21, and an optical sensor 22 that optically detects the number of particles passing through the middle of the suction duct is provided. The output of the optical sensor 22 is given to a counter 23 that counts the number of particles passing through.

The high pressure source 30 is provided to the solenoid valve 33 via the valve 31 and the check valve 32. The electromagnetic valve 33 is a valve that is electrically opened / closed by the operation of the operation unit 34, and the output side thereof is connected to the ejector 21 via a flow meter 35, a throttle valve 36, and a duct 37. High pressure air on the output side of the flow meter 35 is also ducted
It is also given to the bias relay 39 via 38. The bias relay 39 is a pressure reducing valve that controls the pressure P ₀ on the output side so that the pressure P ₁ on the input side of the ejector 21 is added with a predetermined bias pressure k (for example, 0.1 kg / cm ² ). The chamber 11 is connected to the output side via the check valve 40 and the duct 41. The operation unit 34 controls the opening / closing of the solenoid valve 33 and sets the rotation speed of the motor, and its output is also given to the speed control unit 42. Speed controller 42
Is a speed control means for controlling the rotation speed of the motor 14 so as to be a set value. Now, the ejector 21 has a throttle valve.
A duct 43 is provided for pumping the air containing particles sucked from the chamber 11 to the measurement region by the high pressure obtained via 36. In this embodiment, an object to be measured is shown which is made to collide with the impeller of the turbocharger of the engine. That is, in the engine with a turbocharger, the impeller 45 is rotated by giving the exhaust obtained from the combustor 44 to the impeller 45. The particle supply device according to the present embodiment is configured to perform a strength test of the impeller by colliding a predetermined amount of particles with the impeller 45.

In this embodiment, the suction duct 20, the ejector 21, the high pressure source 30
The bias relay 39 and the ducts 37, 38, 41 constitute suction means for sucking particles from the chamber 11.

(Operation of Embodiment) Next, the operation of this embodiment will be described. First high pressure source
The pressure of 30 is set to a high pressure, for example, 4 kg / cm ² or more, the valve 31 and the electromagnetic valve 33 are opened, and the flow rate flowing out is set to a predetermined value using the throttle valve 36. And at the same time, the setting unit 34
Sets the rotation speed of the motor 14 to a predetermined value. Then, the speed controller 42 causes the motor 14 to rotate at a predetermined speed, the deceleration mechanism 15 reduces the speed, and the feeder ring 18 also rotates. As described above, the feeder ring 18 has its lower part buried in the particle group and its upper part exposed from the particle surface and open to the air. Therefore, as the feeder ring 18 rotates, the particles are conveyed in a line in the grooves 18a as shown in FIG. Here, by controlling the throttle valve 36, the input part of the ejector 21 is slightly higher than the atmospheric pressure (about 1 kg / cm ² ) at the open end of the duct 43, for example, 1.1 kg / cm ²
In the chamber 11, the bias relay 39 controls the pressure in the chamber 11 to be higher than that by the bias resistance value k, that is, 1.2 kg / cm ² . Therefore, the pressure inside the chamber 11 becomes higher than that inside the ejector 21, and the air is sucked through the suction hole 20a of the suction duct 20 provided so as to face the upper end of the feeder ring 18. Then, the high-pressure air is sent to the measurement area through the ejector 21 and the duct 43, so that the particles can be supplied to the measurement area.

Now, the particle supply device is mounted on the groove of the feeder ring 18 in a line and is rotating. Therefore, by controlling the rotation speed of the motor 14, it is possible to accurately control the particle supply speed. FIG. 4 is a graph showing the increase in the count value of particles obtained from the counter 23 when the number of rotations of the motor is sequentially changed, and the following table is for the dial value shown in the graph set in the operation unit 34. 5 is a table showing the rotation speed of the feeder ring 18 and the particle supply speed.

In this table, the rotation speed value of the feeder ring 18 corresponding to the dial value 10 to 100, the case of using the particles of the first group for the feeder ring 18-1 (condition I) and the case for the feeder ring 18-2 are shown. The numbers of particles counted when two groups of particles are used (condition II) are shown.

As described above, according to the present invention, by changing the number of rotations of the feeder ring, it is possible to control the particle discharge speed with almost no variation. Further, unlike the conventional example, in particular, the particle supply device according to the first method, the supply of particles can be stopped immediately when the feeder ring is stopped, and the particles can be discharged with almost no time delay when the feeder ring is rotated again. You can Therefore, it is possible to control the particle supply amount extremely accurately. Again chamber 11
Even if the amount of particles inside is reduced, it is automatically supplied from the hopper 12, so the particle surface can always be kept at the level of the cut end 13a of the duct 13.

Although the chamber itself is tilted in this embodiment, it goes without saying that only the feeder ring in the chamber may be tilted at a certain angle from the vertical direction. Further, in this embodiment, a high pressure source is introduced to the ejector through a throttle valve, a suction duct is connected to the ejector, and a suction means for suctioning particles from the chamber by making the pressure in the chamber higher than the ejector is shown. However, it goes without saying that the suction means can be realized by various mechanisms that make the suction duct have a negative pressure from the inside of the chamber.

Further, although the present embodiment describes the particle feeder used for the strength test of the turbocharger, it goes without saying that the particle feeder according to the present invention can be applied to various other uses.

〔The invention's effect〕

According to the present invention, the amount of particles supplied can be controlled based on the number of rotations of the feeder ring that rotates in the chamber. If the rotation speed is made sufficiently low, the amount of particles supplied becomes extremely small, and if the number of rotations is increased, the amount of particles supplied can be increased accordingly. Further, since the particles are supplied to the chamber from the hopper, the particles can be stably supplied for a long time. By exchanging the width of the groove of the feeder according to the particle size of the particles to be supplied, the present apparatus can be applied to various particle sizes. Further, if the motor is stopped, the supply of particles is stopped immediately, and if the motor is rotated again, the particles can be supplied immediately, so that the supply of particles can be controlled without a time delay.

[Brief description of drawings]

FIG. 1 is a structural view showing the overall structure of a particle supply apparatus according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view showing the detailed structure of a chamber of this embodiment, and FIG. 3 is this embodiment. FIG. 4 is a sectional view showing the structure of the feeder ring, FIG. 4 is a graph showing changes in the dial value and the feeding speed of the particle feeder according to the present embodiment, and FIG. 5 is an example of the conventional particle feeder using a screw feeder. FIG. 6 is a schematic diagram showing a conventional table feeder type particle supply device. 11 …… Chamber, 12 …… Hopper, 14 …… Motor, 18
…… Feeder ring, 18a …… groove, 20 …… Suction duct, 2
0a ... Suction hole, 21 ... Ejector, 30 ... High pressure source,
35 …… Flowmeter, 36 …… Throttle valve, 39 …… Bias relay,
42 ... Speed control unit

Claims (2)

[Claims] 1. A chamber that holds particles that have been charged to a certain surface, a hopper that supplies particles to the chamber, and a rotatably mounted unit along a shaft that is arranged at a predetermined angle with respect to the vertical direction, A ring-shaped body having a lower part buried in the particles of the chamber and an upper part exposed from the particle surface, the feeder ring having an annular groove on the upper surface, a motor for rotating the feeder ring, and the motor A speed control means for controlling the particle supply speed by changing the rotation speed of the feeder, and a duct having a suction hole arranged so as to face the upper groove exposed from the particle surface of the feeder ring. And a suction means for suctioning particles conveyed along the particle supply device. 2. The particle feeder according to claim 1, wherein the groove formed on the upper surface of the feeder ring has a width corresponding to the diameter of the particles to be fed.