KR102718922B1 - Device for supplying powder with gravity type homogeneously and Apparatus for Erosion test using the same - Google Patents

Abstract

A powder supply device is provided that enables powder to be sprayed at a constant flow rate to evaluate the erosion resistance of a target specimen. The powder supply device is characterized by including a motor section having a built-in motor, a powder injection housing connected to an upper portion of the motor section and for injecting powder, a hopper cylinder having a container formed therein for containing the powder, a hopper cone cylinder having an end of the container extended to form a cone shape, and a mixing chamber forming body having a mixing chamber formed therein for mixing powder discharged by gravity according to the driving of the motor and flowing gas introduced and discharging the mixture.

Description

{Device for supplying powder with gravity type homogeneously and Apparatus for Erosion test using the same}

The present invention relates to a gravity-type homogeneous powder supply technology for supplying fine powder into an erosion test device, and more specifically, to a device that enables powder to be supplied homogeneously to a spray nozzle when powder is supplied by gravity through a V-shaped container (hopper) containing fine powder, and to an erosion test device using the same.

In the case of gas turbine engines for aircraft such as fighters and missiles, erosion occurs in major parts during operation due to foreign substances flowing in from the outside and foreign substances generated internally. This erosion phenomenon is related to a decrease in engine performance and the life of parts, so coating or surface reinforcement treatment is performed to secure erosion resistance.

In order to verify the erosion resistance of the product with the coating or surface reinforcement treatment, an erosion resistance test is performed using a specimen of the relevant part. At this time, the powder required for the test must be supplied uniformly to the target specimen so that the appropriate erosion resistance performance of the coating part can be determined through evaluation.

However, the V-shaped container (hopper) used in the erosion test device usually has a constant cone angle and supplies powder to the mixing chamber by gravity. However, if the inner angle becomes large, the powder moves downward from the center due to the funnel flow, and the powder is not supplied uniformly into the mixing chamber, so the flow rate of the erosion powder sprayed onto the test specimen through the spray nozzle becomes uneven.

In the case of erosion test evaluation, the amount of erosion powder supplied per hour (hereinafter referred to as flow rate) sprayed on the test specimen must be constant so that the erosion performance factor between each evaluation specimen can be derived and compared, and therefore improvement is necessary.

1. Republic of Korea Publication Patent No. 10-2020-0111613

The purpose of the present invention is to provide a powder supply device capable of spraying powder at a constant flow rate to evaluate the erosion resistance of a target specimen, and an erosion test device using the powder supply device, in order to solve the problems according to the above background technology.

In addition, another purpose of the present invention is to provide a gravity-type homogeneous powder supply device capable of supplying a constant flow rate through a spray nozzle pipe and an erosion test device using the same.

In order to achieve the task presented above, the present invention provides a powder supply device that enables powder to be sprayed at a constant flow rate to evaluate the erosion resistance performance of a target specimen.

The above powder supply device,

Motor section in which the motor is built-in;

A powder injection housing connected to the upper part of the above motor section and for injecting powder;

A hopper cylinder having a container formed therein for containing the powder;

A hopper cone cylinder formed into a cone shape by extending the end of the above container;

It is characterized by including a mixing chamber forming body in which a mixing chamber is formed to mix powder discharged by gravity and flowing gas and discharge the mixture according to the driving of the above motor.

In addition, the motor section is characterized by including a gear box that rotates according to driving of the motor; and a support unit that supports the motor and the gear box.

In addition, the support unit is characterized by including: a support unit housing; a coupling unit installed in the support unit housing and connecting one end of the rotary rod; and a support bearing that holds the rotation axis of the rotary rod for powder stirring.

In addition, the other end of the rotating rod is characterized in that it is connected and assembled to a powder rotating body that mixes powder by rotating.

In addition, the powder rotation body is characterized by including: a single axis; and a plurality of wings coupled to the single axis at a certain angle and having a certain spacing from each other.

Additionally, each of the plurality of wings is characterized by having a half shape of an inverted pentagon.

In addition, it is characterized in that the above-mentioned angle is 45° or less.

In addition, the hopper cone cylinder is characterized in that a funnel-shaped insertion groove corresponding to the lower portion of the powder rotation body is formed.

Additionally, the gear box is characterized by utilizing a reduction gear to stir the powder without clumping.

In addition, the powder injection housing is characterized by including an injection housing body having a shape having an upper and lower step on the outer surface thereof and in which an injection hole is formed from the outer surface to the lower surface; and a cover made of an elastic material covering the outer surface thereof.

In addition, the container is formed inside a hopper cylinder housing forming an outer appearance of the hopper cylinder, and is characterized in that it extends to a lower part of the injection housing body.

In addition, the mixing chamber forming body is characterized in that a mixing chamber is formed inside the mixing chamber forming body to mix powder discharged from the hopper cone cylinder and a flowing gas flowing in from an air jet supply unit to create a mixture, and a powder discharge nozzle tube is installed in communication with the mixing chamber to discharge the mixture.

In addition, the shape variables of the mixing chamber are characterized by being based on the ratio of the inner diameter of the mixing chamber to the powder discharge nozzle tube and the length considering the growth of the turbulent mixing boundary layer of the air jet.

In addition, the powder discharge nozzle tube is characterized by including a nozzle holder; and a discharge nozzle fixed by the nozzle holder.

In addition, the gravity-type homogeneous powder supply device is characterized by including a cover part assembled to the lower part of the mixing chamber forming body.

At this time, the cover part is characterized by having a drain port formed therein to prevent powder from accumulating in the mixing chamber.

On the other hand, another embodiment of the present invention provides an erosion test device including: a gravity-type homogeneous powder supply device; a pressure sensor for detecting pressure for a portion of the gravity-type homogeneous powder supply device; a laser for detecting powder velocity from the gravity-type homogeneous powder supply device; and a fluidizing gas injection device for injecting a fluidizing gas into the gravity-type homogeneous powder supply device.

According to the present invention, it is possible to prevent unevenness in the erosion resistance of a target specimen that may occur due to variation in powder spraying time resulting from non-homogeneous powder supply.

FIG. 1 is a cross-sectional view of a gravity-type homogeneous powder supply device according to one embodiment of the present invention.
FIG. 2 is a bottom view, a cross-sectional view, and a plan view of the hopper cone cylinder illustrated in FIG. 1.
Figure 3 is a conceptual diagram of the powder rotation body illustrated in Figure 1.
Figure 4 is a perspective view of the mixing chamber forming body illustrated in Figure 1.
Figure 5a is a cross-sectional view of the mixing chamber forming body illustrated in Figure 4 taken along the II axis.
FIG. 5b is an example of the design shape and dimensions of a mixing chamber according to one embodiment of the present invention.
Figure 6 is a block diagram of an erosion test device using the gravity-type homogeneous powder supply device illustrated in Figure 1.
Figure 7 is a graph showing the results of an omnidirectional erosion test according to supply pressure using the erosion test device illustrated in Figure 6.
Figure 8 is a graph showing the average velocity distribution of the omnidirectional powder according to the PCV (Positive Crankcase Ventilation) supply pressure using the erosion test device illustrated in Figure 6.

The advantages and features of the present invention, and the methods for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and the embodiments are provided only to make the disclosure of the present invention complete and to fully inform a person having ordinary skill in the art to which the present invention belongs of the scope of the invention, and the present invention is defined only by the scope of the claims.

The sizes and relative sizes of components shown in the drawings may be exaggerated for clarity of illustration.

Throughout the specification, like reference numerals refer to like elements, and “and/or” includes each and every combination of one or more of the items mentioned.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless the context clearly dictates otherwise. As used herein, the terms “comprises” and/or “consists of” do not exclude the presence or addition of one or more other components, steps, operations, and/or elements.

Although the terms first, second, etc. are used to describe various components, it is to be understood that these components are not limited to these terms. These terms are used only to distinguish one component. Accordingly, it is to be understood that the first component mentioned below may also be the second component within the technical concept of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with a meaning that can be commonly understood by a person of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries shall not be ideally or excessively interpreted unless explicitly specifically defined.

Hereinafter, with reference to the attached drawings, a gravity-type homogeneous powder supply device and an erosion test device using the same according to one embodiment of the present invention will be described in detail.

One embodiment of the present invention describes a device that prevents funnel flow by inserting a cone-shaped rotating center rod inside a V-shaped container (hopper) and can supply a constant flow rate through a spray nozzle pipe.

FIG. 1 is a cross-sectional view of a gravity-type homogeneous powder supply device (100) according to an embodiment of the present invention. Referring to FIG. 1, the gravity-type homogeneous powder supply device (100) may be configured to include a motor unit (110) having a built-in motor and driving a gear, a powder injection housing (120) connected to the upper portion of the motor unit (110), a hopper cylinder (130) in which a container (133) for holding powder is formed inside, a hopper cone cylinder (140) in which the end of the container (133) is extended to form a cone shape, a mixing chamber (151) for mixing and discharging powder discharged by gravity according to the driving of the gear and a flowing gas introduced through control.

The motor section (110) may be configured to include a motor (111), a gear box (112) that rotates according to the driving of the motor (111), a support unit (113) that supports the motor (111) and the gear box (112), etc. The support unit (113) is configured to include a support unit housing (113-1), a coupling unit (113-2) that is installed in the support unit housing (113-1) and connects a rotational rod (132), a support bearing (113-3) that holds the rotational axis of the rotational rod (132) for powder mixing, etc.

The gear box (112) can utilize a reduction gear so that the powder is stirred without clumping. Therefore, it is possible to perform a stirring motion through the motor (111) and the gear box (112).

The powder injection housing (120) is connected to the upper part of the motor unit (110) and may be composed of an injection housing body (121), a cover (122) covering the outer peripheral surface of the injection housing body (121), etc. The body (121) has a shape with an upper and lower step on the outer peripheral surface, and an injection hole (121-1) is formed on the lower surface from the outer side. Powder is injected into this injection hole (121-1). Of course, the cover (122) may be made of an elastic material.

A container (133) for holding powder is formed inside the hopper cylinder housing (131) that forms the exterior of the hopper cylinder (130). The container (133) is cylindrical, has a diameter of about 32 mm, and the lowest peak is about 0.7 mm. The total length of the container (133) is about 191.78 mm, and the length of only the cylindrical portion can be about 135.5 mm.

A rotating rod (132) is placed inside this container (133) so as to penetrate the central axis. Of course, the container (133) may extend to a portion of the lower part of the injection housing body (121).

One end of the rotary rod (132) is assembled to a coupling unit (113-2), and the other end is connected to a powder rotator (101) that rotates and mixes powder.

The powder rotor (101) may be configured to include a single axis (101-1), a plurality of blades (101-2-1, 101-2-2) that are coupled to the single axis (101-1) at a certain angle and have a certain spacing from each other.

Each of the above wings (101-2-1, 101-2-2) has a half shape of an inverted pentagon. Therefore, when composed of two or four, two of the wings will have an inverted pentagon shape.

For erosion tests requiring a constant powder supply rate within the specified range, a hopper with a frontal flow (Mass Flow) is suitable. Since the hopper cone angle increases and changes to a funnel flow, if the design value is less than 45°, a frontal flow can be expected regardless of the flow properties of the abrasive powder.

The cone angle of the powder hopper determines the flow pattern of the powder in the hopper together with the flow properties of the powder (the wall friction angle and the internal friction angle). Accordingly, the hopper is designed and selected with an internal angle of 45°, and the smaller the internal angle, the better the fluidity of the powder. However, in order to compensate for the problem that the length of the hopper cone increases significantly, a powder rotator (101) is inserted into the hopper to improve the fluidity of the powder and control the flow rate.

A funnel-shaped (i.e., conical) insertion groove (141) corresponding to the lower portion of the powder rotation body (101) is formed in the hopper cone cylinder (140).

At the lower end of the hopper cone cylinder (140), a mixing chamber forming body (150) in which a mixing chamber (151) is formed is connected to the flue. The mixing chamber forming body (150) is connected and assembled to the end of the hopper cone cylinder (140) and has a powder discharge nozzle pipe (160) that mixes powder discharged from the hopper cone cylinder (140) and a fluid gas flowing in from a fluid gas injection nozzle (180) to discharge the powder.

In order to spray erosion particles from the hopper cone cylinder (130) at a constant speed, a mixing chamber (151) is provided to mix the fluid gas and powder and discharge them as a constant mixture. The main shape variables of the mixing chamber (151) are the ratio of the inner diameter of the mixing chamber (151) to the powder discharge nozzle tube (160) and the length considering the growth of the turbulent mixing boundary layer of the air jet.

Additionally, the ejection performance of the mixing chamber (151) depends on the pressure level of the transported air.

Through this, a test can be performed by spraying erosion particles at a desired flow rate, and when the flow rate changes according to the test standard, the desired speed and/or flow rate can be controlled by adjusting the speed and gas pressure of the powder rotation body (101) in the hopper cylinder (130).

Referring to FIG. 1, the air jet supply unit (180) may be composed of an air tube (181) and an air nozzle (182) that is connected to the air tube (181) to adjust the ejection strength of the flowing gas.

The end of this air nozzle (182) is connected to the mixing chamber (151). The powder discharge nozzle tube (160) is connected to the end of the mixing chamber (151). In detail, the powder discharge nozzle tube (160) may be composed of a nozzle holder (161) and a discharge nozzle (162) fixed by the nozzle holder (161).

The discharge nozzle (162) may be in the shape of a straight pipe.

A cover part (170) is assembled to the lower part of the mixing chamber forming body (150). The cover part (170) is configured with a drain port (172) for discharging powder to the outside and a cover housing (171). In other words, the accumulation of powder in the mixing chamber (151) can be prevented through the drain port (172).

The components shown in Fig. 1, namely, a motor unit (110), a powder injection housing (120), a hopper cylinder (130), a hopper cone cylinder (140), a mixing chamber forming body (151), and a cover unit (170), can generally be assembled together by a bolting method. Of course, adhesives may be used partially. In addition, metal is mainly used as the material, but non-metals, engineering plastics, etc. may also be used.

The hopper cylinder (130) and the hopper cone cylinder (140) are combined to form a powder hopper. The powder supply flow rate can be calculated according to the powder hopper cone angle and outlet diameter, and this is expressed in a table as follows.

The appropriate hopper outlet diameter that satisfies the powder supply flow rate of ASTM G76 based on the basic design value of the hopper cone angle, 30°, is as follows.

Outlet Diameter (mm) Powder Feed Rate (g/s) ASTM G76 Allowable Supply Flow Rate 0.50 0.02519904 At least 0.025 g/s 0.56 0.03330494 Titration 0.033 g/s 0.61 0.04109787 Up to 0.041 g/s

FIG. 2 is a bottom view (210), a cross-sectional view (220), and a plan view (230) of the hopper cone cylinder (140) illustrated in FIG. 1. Referring to FIG. 2, a small circular hole (201) is formed at the upper end of the hopper cone cylinder (140), and a large circular hole (202) is formed at the lower end. That is, a cone-shaped (conical) insertion groove (141) is formed. Accordingly, a funnel-shaped insertion groove (141) corresponding to the lower end of the powder rotation body (101) is formed.

As shown in the cross-sectional view (220), this insertion groove (141) may become wider in the longitudinal direction from the left side and may have a triangular shape.

FIG. 3 is a conceptual diagram of the powder rotator (101) illustrated in FIG. 1. Referring to FIG. 3, it is a side view of the powder rotator (101) composed of four wings (101-2-1 to 101-2-3, 101-2-4). Of course, the fourth wing (101-2-4) is located at the rear and is not illustrated. In addition, a plug (310) may be configured to be detachably assembled. Screw threads may be formed on the outer surface of the plug (310).

FIG. 4 is a perspective view (410, 420) of the mixing chamber forming body (150) illustrated in FIG. 1. Referring to FIG. 4, a first communication hole (401) for communication with the end of the container (133) is formed on the upper surface, and a second communication hole (402) is formed on the lower surface. The diameter of the first communication hole (401) is about 0.7 mm, and the second communication hole (402) is communicated with the drain port (172) of the cover part (170), and an insertion hole (403) into which a nozzle holder (160) is inserted is formed on the side, and an insertion hole into which an air nozzle (182) is inserted is formed on the opposite side.

FIG. 5A is a cross-sectional view of the mixing chamber forming body (151) illustrated in FIG. 4 taken along the I-I axis. Referring to FIG. 5A, the mixing chamber (151) is formed in the center, and a third communicating hole (501) for inserting and connecting an air nozzle (182) is formed on the left. The conical portion of the mixing chamber (151) is approximately 30°. The portion other than the conical portion has a diameter of approximately 5.0 mm. The third communicating hole (501) may be formed to be slightly larger than approximately 1.0 mm. That is, the diameter of the air nozzle (182) is approximately 1.0 mm.

FIG. 5b is an example of the design shape and dimensions of a mixing room according to one embodiment of the present invention. Referring to FIG. 5b, detailed examination of the design shape of the mixing room is as follows.

· The outlet diameter of the powder hopper can be set to 0.7 mm depending on the basic design of the hopper and the results of the powder supply test.

· The inside diameter of the nozzle tube downstream of the mixing chamber is 1.5 mm according to ASTM G76.

· The inside diameter of the air tube must be smaller than the inside diameter of the nozzle tube downstream of the mixing chamber (1.5 mm), and the inside diameter that complies with the air flow rate recommended by ASTM G76 (1.3 L/s, 140 kPa, 28°C or less) is 0.8 mm. However, due to the manufacturing limitations of the air tube, it can be selected as 1.0 mm.

· The diameter of the mixing chamber should be at least three times the inner diameter of the nozzle tube, considering the air flow rate suitable for pneumatic conveying, and can be designed and selected as 5.0 mm. To accelerate the flow between the nozzle tubes from a mixing chamber diameter that is at least three times larger, a conical nozzle is applied, and its inner angle can be selected as 30° considering the flow flow.

· The length of the mixing chamber can be selected as 12.0 mm considering the growth of the turbulent mixing boundary layer of the air jet.

· Examples of mixing room shape dimensions are as follows:

Hopper outlet diameter Air tube inside diameter Nozzle tube inside diameter Mixing chamber inner diameter Mixing room length d _pwd (mm) d _air (mm) d _jet (mm) d _mix (mm) l _mix (mm) 0.7 1.0 1.5 5.0 mm 12.0

FIG. 6 is a block diagram of an erosion test device (600) using a gravity-type homogeneous powder supply device (100) illustrated in FIG. 1. Referring to FIG. 6, in order to conduct an erosion test using a gravity-type homogeneous powder supply device (100), the device may be configured to include a pressure sensor (610) for measuring a supply pressure for the gravity-type homogeneous powder supply device (100), a laser (620) for detecting a powder speed from the gravity-type homogeneous powder supply device (100), an ultra-high-speed camera (630) for photographing a powder ejection state, a fluidizing gas injection device (640) for injecting a fluidizing gas into the gravity-type homogeneous powder supply device (100), etc.

The size of the erosion powder is about 50 μm, and the direction and state of particle movement can be confirmed through an ultra-high-speed camera (630). In addition, the speed can be measured through information reflected from the alumina particles through a laser (620). In detail, a particle velocity measurement method uses a measurement method that analyzes images captured at high speed by irradiating a high-power pulse laser (620) on the particle area. Since this particle velocity measurement method is widely known, further explanation will be omitted.

The pressure determines the flow rate that is sprayed from the nozzle of the air jet (pneumatic air supply pipe) through the mixing chamber together with the final powder from the spray nozzle, so pressure control is performed through flow rate control. For this purpose, a pressure sensor (610) is configured.

The fluid gas injection device (640) may be configured to include an air compressor (641) that supplies air, a regulator that controls the strength of the supplied air, a first valve (643) that turns the air supply on or off, a second valve (644) that discharges the air supply, an additional solenoid valve (645), a PCV (Pressure Control Valve) valve (646), etc.

The pressure inside the gravity type homogeneous powder supply device (100) is controlled by controlling the flowing gas supplied to the gravity type homogeneous powder supply device (100) through the solenoid valve (645) and the PCV valve (646). In other words, the PCV (Pressure Control Valve) value is set through a test, and the solenoid valve (645) turns the air supply on/off at the start/end.

Based on Fig. 6, the erosion test conditions were set as follows.

- Nozzle inner diameter: 1.5mm ± 0.075mm (within 10% of diameter)

- Distance between nozzle and specimen: 10±1mm

- Experimental gas: Dry Air (If using compressed air containing moisture, specify the dew point at -50℃)

- Erosion particle: 50μm Al ₂ O ₃ Angular type

The particle size distribution is as follows.

Distribution map particle size note 100% 20 ~ 83μm 50% thicker than 48μm 50% 42 ~ 57μm

- Erosion particle velocity

The particle velocity measured at the specimen location should be 30±2 m/s. At this time, the gas flow rate is 0.13 L/s, and the approximate gas pressure is 140 kPa, but this value may vary depending on the test device.

- To obtain the steady state value, the test time is approximately 600 seconds. However, if the erosion depth is not deeper than 1 mm, the test may be performed for more than 600 seconds.

- Erosion angle: 90 ± 2˚

- Experimental temperature: Room temperature (18 to 28℃)

- The particle supply rate should be 0.033 ± 0.008 g/s. This corresponds to a particle flux (supply rate per unit area) of 2 mg/mm2.sec at the specimen surface (standard conditions).

The erosion test process is as follows:

1) Adjust the test device before mounting the specimen to set the particle velocity and particle flow rate. The particle flow rate is determined by measuring the amount of particles captured per measurement time period.

2) The weight of the prepared specimen is measured to ± 0.01 mg by polishing the coating surface.

3) The specimen is fixed to the holder at a 90˚ ± 2˚ angle at a distance of 10 mm from the nozzle axis, and an erosion test is performed for a specified time period (time accuracy is within the range of 5 s), after which the specimen is removed and the weight loss is measured.

4) Determine the minimum of 4 points for the total accumulated time for the test 3) above, measure the weight, and display the weight loss per hour on a graph. (Caution) When remounting the specimen, be very careful to remount it in the same position.

- Remove the specimen and measure its weight at 2, 4, 6, 8, and 10 minutes based on 600 seconds (10 minutes).

- For Type 1020 Steel, 2, 4, 8 and 16 minutes are appropriate.

- Steady State erosion results appear after 1 to 2 minutes and may vary depending on the material.

5) Steady State erosion rate is determined by the slope of the weight loss graph per hour.

- The average erosion value is the erosion rate divided by the abrasive flow rate divided by the specimen density. This can be expressed as a mathematical formula as follows:

Here, the unit is mm3/g.

6) After a series of tests are completed, the feed rate and particle velocity must be measured (usually every 10 experiments).

Figure 7 is a graph showing the results of an omnidirectional erosion test according to the supply pressure using the erosion test device illustrated in Figure 6. Referring to Figure 7, the results of the omnidirectional erosion test according to the supply pressure confirmed that the flow rate increased as the PCV supply pressure increased.

Fig. 8 is a graph showing the average velocity distribution of the omnidirectional powder according to the PCV (Positive Crankcase Ventilation) supply pressure using the erosion test device illustrated in Fig. 6. Referring to Fig. 8, it was confirmed that the average velocity increases linearly in proportion to the PCV supply pressure.

100: Gravity homogeneous powder feeding device 101: Powder mixer
110: Motor section 111: Motor
112: Gear box 120: Powder injection housing
130: Hopper cylinder 133: Container
140: Hopper Cone Cylinder
150: Mixing chamber forming body 151: Mixing chamber
160: Powder discharge nozzle tube 170: Cover part
180: Air jet supply section
600: Erosion test device
610: Pressure sensor 620: Laser
640: Fluid gas injection device

Claims (16)

A motor section (110) in which a motor (111) is built-in;
A powder injection housing (120) connected to the upper part of the above motor section (110) for injecting powder;
A hopper cylinder (130) having a container (133) formed therein for containing the powder;
A hopper cone cylinder (140) formed into a cone shape by extending the end of the above container (133); and
A mixing chamber forming body (150) in which a mixing chamber (151) is formed to mix powder discharged by gravity and flowing gas and discharge the mixture according to the driving of the above motor (111);
A gravity type homogeneous powder feeding device comprising:
In paragraph 1,
The above motor part (110)
A gear box (112) that rotates according to the driving of the above motor (111); and
A gravity-type homogeneous powder supply device characterized by including a support unit (113) supporting the above motor (111) and gear box (112).
In the second paragraph,
The above support unit (113) is
Support unit housing (113-1);
A coupling unit (113-2) installed in the above support unit housing (113-1) and connecting one end of the rotating rod (132); and
A gravity-type homogeneous powder supply device characterized by including a support bearing (113-3) that holds the rotation axis of the rotary rod (132) for powder mixing.
In the third paragraph,
A gravity-type homogeneous powder supply device characterized in that the other end of the above-mentioned rotating rod (132) is connected and assembled to a powder rotating body (101) that rotates and mixes powder.
In paragraph 4,
The above powder rotation body (101) is
Single axis (101-1); and
A gravity-type homogeneous powder supply device characterized by including a plurality of wings (101-2-1, 101-2-2) which are connected to the above-mentioned axis (101-1) at a certain angle and have a certain spacing from each other.
In paragraph 5,
A gravity-type homogeneous powder supply device, characterized in that each of the plurality of wings (101-2-1, 101-2-2) has a half-shape of an inverted pentagon.
In paragraph 5,
A gravity-type homogeneous powder supply device, characterized in that the above-mentioned constant angle is 45° or less.
In paragraph 5,
A gravity-type homogeneous powder supply device characterized in that a funnel-shaped insertion groove (141) corresponding to the lower portion of the powder rotation body (101) is formed in the above hopper cone cylinder (140).
In the second paragraph,
The above gear box (112) is a gravity-type homogeneous powder supply device characterized by utilizing a reduction gear so that the powder is stirred without clumping.
In paragraph 1,
The above powder injection housing (120) is
An injection housing body (121) having a shape with an upper and lower step on the outer surface and in which an injection hole (121-1) is formed from the outer surface to the lower surface; and
A gravity-type homogeneous powder supply device characterized by including a cover (122) made of an elastic material covering the outer peripheral surface.
In Article 10,
A gravity-type homogeneous powder supply device, characterized in that the container (133) is formed inside a hopper cylinder housing (131) forming the exterior of the hopper cylinder (130) and extends to a lower portion of the injection housing body (121).
In paragraph 1,
Inside the above mixing chamber forming body (150),
A gravity-type homogeneous powder supply device characterized in that a mixing chamber (151) is formed to mix powder discharged from the hopper cone cylinder (140) and a flowing gas flowing in from an air jet supply unit (180) to create a mixture, and a powder discharge nozzle tube (160) is installed in communication with the mixing chamber (151) to discharge the mixture.
In Article 12,
A gravity-type homogeneous powder supply device characterized in that the shape variables of the above mixing chamber (151) are based on the ratio of the internal diameter of the mixing chamber (151) to the powder discharge nozzle tube (160) and the length considering the growth of the turbulent mixing boundary layer of the air jet.
In Article 12,
The above powder discharge nozzle tube (160)
Nozzle holder (161); and
A gravity-type homogeneous powder supply device characterized by including a discharge nozzle (162) fixed by the nozzle holder (161).
In paragraph 1,
A gravity-type homogeneous powder supply device, comprising: a cover part (170) assembled to the lower part of the mixing chamber forming body (150); characterized in that a drain port (172) is formed in the cover part (170) to prevent powder from accumulating in the mixing chamber (151).
Gravity type homogeneous powder feeding device (100);
A pressure sensor (610) for detecting pressure in a section of the above gravity-type homogeneous powder supply device (100);
A laser (620) for detecting the powder speed from the above gravity type homogeneous powder supply device (100); and
It includes a fluidizing gas injection device (640) that injects fluidizing gas into the above gravity-type homogeneous powder supply device (100);
The above gravity type homogeneous powder supply device (100) is
A motor section (110) having a built-in motor and driving a gear;
A powder injection housing (120) connected to the upper part of the above motor section (110) for injecting powder;
A hopper cylinder (130) having a container (133) formed therein for containing the powder;
A hopper cone cylinder (140) formed into a cone shape by extending the end of the above container (133);
An erosion test device characterized by including a mixing chamber forming body (150) in which a mixing chamber (151) is formed to mix powder discharged by gravity and flowing gas introduced by driving the gear and discharge the mixture.