JPS63258318A - Particle feeder - Google Patents

Abstract

PURPOSE:To stabilize feeding, in a particle feeder to be employed in withstandability test for engine, by rotating a feeder ring while inclining in particle layer in a chamber and taking out particles from the particle layer by means of the feeder ring. CONSTITUTION:A feeder ring 18 is controlled to have a setting speed by a speed control section 42 and rotates in a chamber 11. Consequently, particles are held in a groove 18a in the feeder ring 18 and carried then separated from particle face. A high pressure source 30 is driven to open valves 31, 33 so as to regulate a throttle valve 36. Consequently, the interior of the chamber 11 is controlled by a bias relay 39 and held at higher pressure than an ejector 21 and negative pressure of which is applied onto a suction port 20a. Consequently, particles in the groove 18a are sucked and fed through a duct 43 to a measuring region. With such arrangement, stable feeding can be achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a particle supply device that continuously supplies particles;
In particular, the present invention relates to a particle supply device whose supply amount can be easily controlled.

[Prior art]

BACKGROUND OF THE INVENTION Conventionally, in engine durability and strength tests, particle supply devices are used, for example, to continuously blow granular particles onto a predetermined part of an engine to test its strength.

For example, as shown in FIG. 5, such a particle supply device includes a screw feeder 2 provided at the lower part of a pumper 1 to which particles are supplied, and a motor 3 to feed the screw feeder 2.
There is also a screw feeder-type feeding device that drives the hopper and supplies high-pressure air to its outlet via a duct 4 to continuously supply particles to a predetermined area, and a rotating feeder at the bottom of the hopper 5 as shown in Fig. 6. A disk 6 is provided, particles are placed on this disk and rotated, and a rotary roller 7 is provided in the middle of the rotation.
A feeding device using a table feeder method is known in which the particles are scraped off with a scraper 8 and then fed after making the thickness of the particles on the disk constant.

[Problem that the invention seeks to solve]

However, with such conventional particle supply devices, it is difficult to stably and accurately control the particle supply rate. That is, according to the first method using a screw feeder, even when the motor 3 is stopped, particles are released from the tip of the screw feeder 2 for a certain period of time, and even when the motor 3 is driven again, the particles transported by the feeder are There is a problem that it takes a certain amount of time to reach the tip, and if the particle supply rate is low, the particles cannot be stably supplied. Furthermore, it has been difficult to control the particle supply rate to correspond accurately to the rotational speed of the motor.

Further, according to the second table feeder method described above, there is no problem when the particle size is less than several tens of micrometers, but when feeding particles larger than that, there is a risk that the particles will be crushed by the roller 7 in FIG. However, there was a problem in that it was difficult to make the thickness of the particles constant on the disk.

The present invention has been made in view of the problems of conventional particle supply devices, and is capable of continuously and stably supplying particles at an arbitrary supply rate, and in addition, it is possible to reduce the supply rate to a low value. The technical problem is to be able to arbitrarily set up to 100%, and to supply even granular particles without pulverizing them.

[Means for solving problems]

The present invention is a particle supply device that continuously supplies particles, and as shown in FIGS. A hopper and an annular body which is rotatably mounted along an axis tilted at a predetermined angle from the vertical direction, and whose lower part is buried in the particles of the chamber and whose upper part is exposed from the particle surface. A feeder ring having an annular groove on its upper surface, a motor for rotating the feeder ring, a speed control means for controlling particle supply speed by changing the rotational speed of the motor, and an upper groove exposed from the particle surface of the feeder ring. The apparatus is characterized in that it includes a suction means that includes a duct having suction holes arranged opposite to the feeder ring, and suction means for suctioning particles conveyed along the grooves of the feeder ring.

[Effect]

According to the present invention having such characteristics, a feeder ring tilted at a certain angle from the vertical direction is rotatably held in the chamber, and its lower part is buried in the particles of the chamber and its upper part is exposed from the particle surface. ing. Since a groove is formed on the upper surface of the feeder ring, when the feeder ring is rotated, the particles are loaded in the annular groove, so that the particles can be transported by the feeder ring. A suction hole of a suction duct is provided opposite to the upper surface of the feeder ring at a position exposed from the particle surface, and the particles to be transported are sucked by the suction means and supplied to a predetermined area. The rotational speed of the motor can be arbitrarily set by a speed control means.

[Explanation of Examples]

(Configuration of Example) FIG. 1 is a block diagram showing the overall structure of a particle supply device according to an example of the present invention. The particle supply device according to the present invention has a cylindrical chamber 11 that holds particles, and a hopper 12 that supplies particles is attached to the upper part of the chamber 11.

The chamber 11 is fixed at a predetermined angle θ, for example, 25° from the vertical direction. Homper 12 is chamber 1
Particles are continuously supplied into the chamber. Hopper 1
As shown in a partially cutaway perspective view in FIG. 2, a supply duct 13 is attached to the lower end of the supply duct 13, which has a cut end 13a that protrudes into the chamber 11 and is inclined so that its lower surface is horizontal when the chamber 11 is tilted. It is being The particle surface within the chamber 11 is determined by the position of this cut 13a. Now, at the top of the chamber 11 is the motor 14.
and a speed reduction mechanism 15 are fixed. A feeder ring 18 rotatably held by a bearing 17 provided in the chamber 11 is attached to the rotating shaft 16 of the deceleration mechanism 15.
is installed. The feeder ring 18 has an annular structure connected to the rotating shaft 16 by cross-shaped spokes 19, and has an annular groove 18a on its upper surface, as shown in an enlarged cross-sectional view in FIG. and chamber
Feeder ring 18 because 11 itself is tilted at a predetermined angle
is also inclined by an angle θ from the vertical direction, and as shown in the figure, the lower part is buried in the particles supplied from the popper, and the upper part is exposed from the particle surface.

Here, the particles to be supplied have a particle size distribution center of which, for example, has a major axis of 0, 8*yaφ, a minor axis of 0, and a particle of 4*yaφ (
If the particles are particles of the first group), it is preferable that the groove width d of the groove 18a provided on the upper surface of the feeder ring 18 shown in FIG. If the particles to be fed in the same manner are particles (second group of particles) whose center of particle diameter distribution has a major axis of 2 mm and a minor axis of 11 mm, it is preferable that the groove width of the feeder ring 18 is d and 2 mm. In the following description, the feeder rings with groove widths d of 111 and 211 are assumed to be 184 and 18-2, respectively.

Now, a suction duct 20 having a suction hole 20a at a position facing the groove 18a of the feeder ring 18 is provided at the uppermost part of the feeder ring 18 exposed from the particle surface. The suction duct 20 is for sucking particles into the ejector 21, and an optical sensor 22 for optically detecting the number of particles passing through the suction duct is provided in the middle of the suction duct. The output of the optical sensor 22 is sent to a counter 23 that counts the number of particles passing through.
is given to.

Now, the high pressure source 30 has a valve 31. It is applied to a solenoid valve 33 via a check valve 32. The solenoid valve 33 is an operating section 34
It is a valve that is electrically opened and closed by the operation of 35, and has a flow meter 35 on its output side. The ejector 21 is connected via a throttle valve 36 and a duct 37. The high pressure air on the output side of the flow meter 35 is also passed through the duct 38 to the bias relay 3.
Also given to 9. Bias relay 39 is ejector 2
The pressure P on the output side is set to be the pressure obtained by adding a predetermined bias pressure k (for example, 0.1 kg/cnl) to the atmospheric pressure P on the input side of 1. The chamber 11 is connected to the output side of the pressure reducing valve via a check valve 40 and a duct 41. The operating section 34 controls the opening and closing of the electromagnetic valve 33 and sets the rotational speed of the motor, and its output is also given to the speed control section 42 . The speed control unit 42 is a speed control means that controls the rotational speed of the motor 14 to a set value. Now, ejector 21
A duct 43 is provided in which the air containing particles sucked from the chamber 11 by the high pressure obtained through the throttle valve 36 is pumped to the measurement area. In this example, the object to be measured is made to collide with the impeller of the turbocharger of the engine. That is, in a turbocharged engine, the impeller 45 is rotated by supplying the exhaust gas obtained from the combustor 44 to the impeller 45. The particle supply device according to this embodiment tests the strength of the impeller by colliding a predetermined amount of particles with the impeller 45.

In this embodiment, the suction duct 20. Ejector 21° high pressure a30 and bias relay 39 and duct 1-37.3
8.41 constitutes a suction means for suctioning particles from the chamber 11.

(Operation of this embodiment) Next, the operation of this embodiment will be explained. First, the pressure of the high pressure source 30 is set to a high pressure, for example, 4 kg/c+l! As above,
The valve 31 and the electromagnetic valve 33 are opened, and the outflow flow rate is set to a predetermined value using the throttle valve 36. At the same time, the setting unit 34 sets the rotational speed of the motor 14 to a predetermined value. Then, the speed controller 42 causes the motor 14 to rotate at a predetermined speed 1, and the speed reduction mechanism 15 decelerates the speed, causing the feeder ring 18 to also rotate. As described above, the lower part of the feeder ring 18 is buried in the particle group, and the upper part is exposed from the particle surface and open to the air.

Therefore, as the feeder ring 18 rotates, the particles are conveyed to the groove 18a almost in a line, as shown in FIG. Here, by controlling the throttle valve 36, the input section of the ejector 21 is controlled at the atmospheric pressure (
Atmospheric pressure slightly higher than approximately 1 kg/c+d), e.g. 1.
Assuming that the weight is 1 kg/c-, chamber 1
The pressure inside 1 is higher than that by the bias resistance value, that is, 1
．． It is controlled by the bias relay 39 to be 2 kg/cnl.

Therefore, the inside of the chamber 11 has a higher pressure than the inside of the ejector 21, and is suctioned through the suction hole 20a of the suction duct 20 provided opposite the upper end of the feeder ring 18. Then, high-pressure air is sent to the measurement area via the ejector 21 and the duct 43, so that particles can be supplied to the measurement area.

Now, this particle supply device is mounted substantially in a line on the groove of the feeder ring 18 and rotates. Therefore, by controlling the rotational speed of the motor 14, it is possible to precisely control the particle supply rate. FIG. 4 is a graph showing the increase in particle counts obtained from the counter 23 when the rotational speed of the motor is sequentially adjusted.
It is a table showing the rotational speed of the feeder ring 18 and the particle supply speed with respect to the dial values shown in the graph set in .

This table shows the rotational speed values of the feeder ring 18 corresponding to dial values 10 to 100, the case where the particles of the first group are used for the feeder ring 18-1 (condition I), and the case where the particles of the first group are used for the feeder ring 18-2, and the case where the particles of the first group are used for the feeder ring 18-2. The number of particles counted when two groups of particles are used (condition (■)) is shown.

As shown in the table, according to the present invention, the particle release rate can be controlled with almost no variation by changing the rotational speed of the feeder ring.

Also, unlike the conventional example, especially the particle supply device according to the first method, when the feeder ring is stopped, the supply of particles can be stopped immediately, and when the feeder ring is rotated again, the particles can be discharged with almost no time delay. Can be done.

It is therefore possible to control the particle feed rate very precisely. Furthermore, even if the particles in the chamber 11 decrease, they are automatically supplied from the pumper 12, so that the particle surface can always be maintained at the level of the opening 13a of the duct 13.

In this embodiment, the chamber itself is tilted, but it goes without saying that only the feeder ring inside the chamber can be tilted at a certain angle from the vertical direction. In addition, this embodiment shows a suction means in which a high pressure source is introduced to the ejector through a throttle valve and a suction duct is connected to the ejector, and particles are suctioned from the chamber by making the pressure inside the chamber higher than that of the ejector. However, it goes without saying that the suction means can be realized by various mechanisms that create negative pressure in the suction duct from inside the chamber.

Furthermore, although this embodiment describes a particle supply device used for testing the strength of a turbocharger, it goes without saying that the particle supply device according to the present invention can be applied to various other uses.

〔Effect of the invention〕

According to the present invention, the amount of particles supplied can be controlled based on the rotational speed of the feeder ring rotating inside the chamber. If the rotational speed is made sufficiently low, the amount of particles supplied becomes extremely small, and if the rotational speed is increased, the amount of particles supplied can be increased accordingly. Furthermore, since particles are supplied to the chamber from a hopper, particles can be stably supplied for a long period of time. By changing the width of the feeder ring groove in accordance with the particle size of the particles to be fed, the present device can be applied as is to particles of 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 effect that the supply of particles can be controlled without time delay is obtained.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram showing the overall configuration of a particle supply device according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view showing the detailed structure of the chamber of this embodiment, and FIG. FIG. 4 is a graph showing changes in the dial value and feeding speed of the particle feeding device according to this embodiment, and FIG. 5 is an example of a particle feeding device using a conventional screw feeder. FIG. 6 is a schematic diagram showing a conventional table feeder type particle supply device.

Claims (2)

[Claims] (1) A chamber that holds particles that have been charged up to a certain level, a hopper that supplies particles to the chamber, and a hopper that is rotatably mounted along an axis tilted at a predetermined angle from the vertical direction, with the bottom facing downward. An annular body buried in the particles of the chamber and disposed so that its upper part is exposed from the particle surface,
a feeder ring having an annular groove on its upper surface; a motor for rotating the feeder ring; a speed control means for controlling particle supply speed by changing the rotational speed of the motor; and a feeder ring exposed from the particle surface of the feeder ring. 1. A particle feeding device comprising: a duct having a suction hole arranged opposite to a groove in an upper part of the feeder ring, and a suction means for sucking particles conveyed along the groove of a feeder ring. (2) The particle supply device 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 supplied.