KR101687171B1 - Overcoater for coating of particle surface - Google Patents

Abstract

The present invention relates to an overcoater to coat a coating agent on the surface of ceramic particles. According to the present invention, the overcoater comprises: a housing having an opening part in an upper surface; a rotary shaft vertically inserted into the opening part, and including a hollow lower rotary shaft and an upper rotary shaft inserted into a hallow of the lower rotary shaft to be rotated with the lower rotary shaft; a horizontal rotary unit supported from an inner wall of the housing and horizontally rotating the lower rotary shaft; a vibration unit supported from the inner wall of the housing, and connected to the upper rotary shaft to vertically vibrate the upper rotary shaft; a support bearing unit including a bearing to surround the rotary shaft, and a support fixed on an inner surface of the housing to support the bearing; and a rotary vessel installed at an upper end of the upper rotary shaft. Thus, since a vibration means to vibrate the rotary vessel into which tri-isotropic coated fuel (TRISO) particles and coating agent are inserted as well as a horizontal rotating means to horizontally rotate the rotary vessel are included, the particles are prevented from being aggregated with the coating agent, so uniform coating can be realized.

Description

[0001] OVERCOATER FOR COATING OF PARTICLE SURFACE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to overcoating equipment, and more particularly to overcoating equipment for coating a coating material on the surface of ceramic particles.

Nuclear power generation generates electricity using heat generated by nuclear fission of uranium. Uranium oxide is a nuclear fuel sintered body of a commercial nuclear power plant, which is put into a zirconium alloy cladding tube and sealed and welded to both ends to manufacture a fuel rod. However, the development of a new concept of nuclear fuel has been carried out globally in order to secure the soundness of the nuclear fuel test. In particular, tri-structural isotropic particles of compressed microcapsules (TRISO) have been developed in graphite matrices used as nuclear fuel for gas-cooled reactors, which are the fourth generation (Gen-IV). Recently, TRISO particles used as nuclear fuel for gas-cooled reactors have been studied for use in light-water reactors. SiC-based sintered bodies for accident resistance-resistant fuel fabrication under FCM (Fully Ceramic Micro-encapsulated) concept are representative. The SiC-based sintered body is a SiC-based fuel filled in a multi-sheathed TRISO particle composed of a Buffer PyC layer, an Inner-PyC layer, an SiC layer and an Outer-PyC layer and a SiC base, , There is at least 30 vol.% Of TRISO particles on the SiC matrix. When a large number of TRISO particles are filled in the SiC matrix and then sintered, each TRISO particle may experience cracking due to the stress around the TRISO particle due to the densification of the SiC matrix. In order to prevent cracking of the TRISO particles, researchers have been studying application of a coating agent or a buffer on the surface of the TRISO particles. The overcoated TRISO particles prevent cracking due to direct contact of the TRISO particles during the sintering of the SiC- , And overcoating equipment that can be uniformly distributed in SiC base was developed.

The over-coating equipment for the over-coating of TRISO particle surface was prepared and coated on the surface of TRISO particle. However, in the overcoating equipment manufactured in the previous study, the TRISO particle is rotated after rotating the slit drum, and the coating agent is uniformly applied to the TRISO particle through the automatic injector as a peripheral device. The overcoating method of the ceramic particles is such that the TRISO particles and the coating agent are coalesced together to form a lump, and as a result, it is impossible to uniformly overcoat the surface of the particles.

IAEA-TECDOC-1645 "High temperature gas cooled reactor fuels and materials" International atomic energy agency, vienna, 2010

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide an overcoater capable of uniformly coating a ceramic particle surface with a TRISO particle and a coating agent.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an overcoating machine comprising: a housing having an opening formed on an upper surface thereof; a lower shaft rotatably inserted into the opening; A horizontal rotating part supported by the inner wall of the housing and supported by the inner wall of the housing and horizontally rotating the lower rotating shaft; a vibration part connected to the upper rotating shaft to vibrate the upper rotating shaft up and down; A support bearing portion including a bearing surrounding the rotation shaft and a support member fixed to the inner surface of the housing and supporting the bearing; and a rotary container installed at an upper end of the upper rotation shaft.

Preferably, the upper rotary shaft is variable in the vertical direction with respect to the lower rotary shaft.

The stepping motor is preferably composed of a first stepping motor and a second stepping motor, and the power transmitting part includes a stepping motor and a stepping motor, The first stepping motor and the second stepping motor are arranged such that the lower rotation axis is alternately arranged in the opposite direction to the first rotation transmitting part and the second rotation transmitting part that receives the power from the second stepping motor. .

Further, the vibrating portion includes vibration generating means for generating vibration and transmitting the vibration to the upper rotary shaft to vary the upper rotary shaft in the vertical direction, and return means for returning the upper rotary shaft, which is vertically variable due to the vibration generating means, back to its original position.

Wherein the vibration generating means comprises a vibration generating source for generating vibration in the vertical direction, a vibration spring for receiving vibration from the vibration generating source, a thrust bearing for receiving the vibration from the vibration spring and varying in the vertical direction, And a rotary diaphragm that is integrally coupled to the upper rotary shaft and rotates in contact with the thrust bearing to transmit the vibration of the thrust bearing.

In this case, the vibration source includes a vibration motor fixedly installed on the inner wall of the housing, an eccentric rotor eccentrically rotated by the vibration motor, and a hollow circular plate. The eccentric rotor contacts the bottom surface, And a first oscillation transmitting plate for transmitting the oscillation of the eccentric rotor to the oscillating spring.

Or the vibration generating source is a hollow circular plate rotated integrally with the upper rotary shaft, the circular plate cam having contact projections formed on the upper surface thereof, and a hollow circular plate into which the upper rotary shaft is inserted into the hollow, And a second vibration transmitting plate fixedly connected.

According to the overcoater of the present invention, not only horizontal rotating means for horizontally rotating the rotary container into which the TRISO particles and the coating agent are injected but also vibration means for vertically vibrating are provided to prevent the particles and the coating agent from aggregating with each other, There is an effect that the coating can be made.

1 is a photograph of a coater according to the present invention,
2 is a perspective view of a coater according to the present invention,
3 is a plan view of the coater according to the present invention,
4 is a front sectional view of the first embodiment of the coater according to the present invention,
5 is a front sectional view of a second embodiment of the coater according to the present invention,

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

There are two embodiments of the vibration generating means in the structure of the overcoat according to the present invention.

Therefore, in the following description, two embodiments of the vibration generating means of the overcoat according to the present invention will be described in order. However, the description of the redundant configuration in the two embodiments can be omitted in the second embodiment.

Hereinafter, a first embodiment of the present invention will be described.

As shown in FIG. 4, the first embodiment of the present invention includes a housing 100 in which an opening is formed on an upper surface thereof, a cavity 100 vertically inserted into the opening and having a hollow lower rotation axis 220, And the upper rotation shaft 210 inserted into the upper rotation shaft 220 and rotated together with the lower rotation shaft 220. The upper rotation shaft 210 includes a rotation shaft 200 installed to be vertically variable with respect to the lower rotation shaft 220, A horizontal rotating part 400 supported from the inner wall of the housing 100 and horizontally rotating the lower rotating shaft 220; A support bearing part 500 formed of a bearing surrounding the rotating shaft 200 and a support fixed to the inner surface of the housing 100 to support the bearing, To be installed in (600).

In this case, the upper rotary shaft 210 is vertically variable with respect to the lower rotary shaft 220.

The upper rotary shaft 210 is vertically moved with respect to the lower rotary shaft 220 while being rotated together with the lower rotary shaft 220 so that the upper rotary shaft 210 receives the rotary force when the upper rotary shaft 210 is inserted into the hollow of the lower rotary shaft 220 Concave-convex coupling can be achieved.

Although not shown in detail, protrusions and protrusions and protrusions can be formed on the outer circumferential surface of the upper rotary shaft 210 and the inner circumferential surface of the lower rotary shaft 220 so that the upper rotary shaft 210 and the lower rotary shaft 220 can be assembled with each other.

The upper rotary shaft 210 may be vertically varied on the inner peripheral surface of the lower rotary shaft 220 in a piston manner.

It is preferable that the horizontal rotation part 400 is provided with two as shown in FIG.

One of them is referred to as a first stepping motor 410 and a first power transmitting part 420 and the other is referred to as a second stepping motor 450 And the second power transmission portion 460. [

The first stepping motor 410 and the second stepping motor 450 each drive the rotating shaft 200 in only one direction and the first stepping motor 410 and the second stepping motor 420 are rotated in opposite directions And drives the rotating shaft.

Therefore, it is possible to drive the rotating shaft more quickly and accurately by providing the two stepping motors that drive the rotating shaft only in one direction as compared with when only one stepping motor is provided.

And more preferably, the rotational axes of the two stepping motors 410 and 450 may be orthogonal. When the axes of the two stepping motors 410 and 450 are orthogonal as shown in FIG. 3,

The first stepping motor 410 rotates the lower rotation axis only in the clockwise direction and the second stepping motor 450 rotates the lower rotation axis only in the counterclockwise direction so that one stepping motor alternately rotates in a short time .

In this case, a gear box for transmitting the rotation axis motion of the first and second stepping motors 410 and 450 is built in the first power transmission portion 420 and the second power transmission portion 460, And a ball screw for transmitting the ball screw to the lower rotation shaft (not shown).

When the rotational force is transmitted to the lower rotary shaft by the ball screw, a worm gear may be built in the lower rotary shaft (not shown).

When the lower rotary shaft is rotated by the combination of the ball screw and the worm gear, more precise speed control becomes possible.

Next, the vibration generating means 310 and the return means 350 in the overcoat according to the present invention will be described.

4, the vibration generating means 310 vibrates the rotary container 600 with the vibration motor 311 and the return means 350 vibrates the rotary container 600 with the vibration motor 311 When the upper rotating shaft 210 is vertically variable due to the vibration, the upper rotating shaft 210 returns to its original position.

4, the vibration generating means 310 includes a vibration motor 311, an eccentric rotor 313 for converting the rotation of the rotary shaft of the vibration motor 311 into vertical vibration and an eccentric rotor 313, A vibration spring 335 which is vertically variable due to the first vibration transmission plate 314 and a vibration spring 335 which is vertically variable along with the vibration spring 335. The first vibration transmission plate 314, A first spherical bearing 318 for supporting the first thrust bearing 316 to be variable and a rotary diaphragm 337 for receiving the vertical vibration from the first thrust bearing 336. The first thrust bearing 316,

Only the rotary diaphragm 337 is rotated in the configuration of the vibration generating means 310 and the upper and lower vibrations are transmitted to the rotary diaphragm 337 without being rotated.

Here, the first spherical bearing 318 supports the first thrust bearing 316 so as to be vertically variable. The spherical bearing is also referred to as a tapered bearing and acts to support the shaft while ensuring a variable outside the rotational direction of the rotating shaft passing through the inner peripheral surface of the bearing.

In this case, means for setting the interval between the first oscillation transmitting plate 314 and the first thrust bearing 316 so that the length of the oscillating spring 315 can be adjusted can be provided.

The returning means 350 includes a returning circular plate 351 which is inserted into the center of the upper rotating shaft 210 and rotated integrally with the upper rotating shaft 210 and a returning plate 351 which is disposed above the returning circular plate 351 to apply a pressure to the returning circular plate 351 A return spring 355 disposed on the second thrust bearing 352 to apply pressure to the second thrust bearing 352 and a return spring 355 disposed on the second thrust bearing 352 to fix the return spring 355, (358).

Therefore, even if the upper rotary shaft 210 is vertically vibrated due to the vibration generating means 310, the vibration can be recovered at every moment when the vibration occurs in the home position without being separated.

In the present invention, since vibration is not directly transmitted to the rotary shaft 200 by using springs in both the vibration generating means 310 and the returning means 350, a certain degree of vibration damping action occurs, So that the mechanical stability is maintained.

Meanwhile, as shown in FIG. 4, a support bearing part 500 for supporting the lower rotation shaft may be provided.

The support bearing portion 500 may include a first oil-less bearing 510 that surrounds the lower rotation shaft and a fixed support 520 that supports the first oil-less bearing 510.

The fixed support 520 is integrally formed and fixed to the inner surface of the housing 100.

In addition, since the oilless bearing is used for the support of the lower rotary shaft 220, the mechanical integrity of the rotary shaft can be maintained even in the case of difficulty in lubricating the rotary shaft.

4, a second oil-less bearing 530 and a variable support 540 may be additionally provided on the first oil-less bearing 510 and the fixed support 520. As shown in FIG.

The second oil-less bearing 530 and the variable support 540 are connected to the fixed support 520 and the variable support 540 only by the support springs 550. The variable support 540 is connected to the housing body 110 It is variable and can be placed independently.

The possibility of permanent eccentric deformation of the supporting means for supporting the lower rotary shaft 220 due to the variable support rods 540 being varied can be reduced.

Although not shown here, an additional elastic body is interposed between the variable support 540 and the inner surface of the housing 100 so that the variable support 540 can move from the inner surface of the housing 100

The lower eccentricity of the lower rotary shaft 220 can be more thoroughly prevented.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

Since the second embodiment of the present invention is the second embodiment relating to the vibration generating means, the remaining configuration except for the vibration generating means is the same as that of the first embodiment.

Therefore, the description of the overlapping configuration will be omitted.

5, the vibration generating means 310 of the second embodiment of the present invention includes a disk cam 331 rotated integrally with the upper rotation shaft 210, A vibration spring 335 provided on the upper portion of the second vibration transmitting plate 334 and an upper end of the vibration spring 335 connected to the lower surface of the second vibration transmitting plate 334,

A first thrust bearing 336 that receives the force, and a rotary diaphragm 337.

In the second embodiment shown in FIG. 5, the disc cam 331 is used, so that no additional driving source is required unlike the first embodiment.

In other words, in the first embodiment shown in FIG. 4, the vibration motor 311 is separately provided to generate vibration. In the second embodiment shown in FIG. 5, the rotation of the upper rotary shaft 210, which is rotated by the rotation of the lower rotary shaft 220, Is used to generate vibration.

5, the second vibration transmitting plate 334, which is disposed above the disc cam 331, is inclined to one side so that the second vibration transmitting plate 334 is inclined 2 vibration of the vibration transmitting plate 334 is periodically brought into contact with the curvature of the upper portion of the disk cam 331,

At this time, the vibration spring 335 connecting the upper surface of the second vibration transmitting plate 334 and the lower surface of the first thrust bearing 336 is not uniform in length as shown in FIG. Further, the elastic moduli of the respective vibration springs 335 may be different from each other.

By varying the elastic modulus between the respective vibration springs 335, the inclined angle of the second vibration transmission plate 334 can be more reliably maintained.

However, also in this case, setting means for adjusting the interval between the second vibration transmitting plate 334 and the first thrust bearing 336 may be provided (not shown).

5 are the same except for the vibration generating means, the detailed description thereof will be omitted.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

100: housing 110: body
120: Support frame 200:
210: upper rotating shaft 220: lower rotating shaft
310: Vibration generating means 311: Vibration motor
313: eccentric rotor 314: first oscillation transmitting plate
315: Vibration spring 316: First thrust bearing
317: Rotating diaphragm 318: First spherical bearing
330: Vibration generating means 331:
334: second vibration transmission plate 335: vibration spring
336: first thrust bearing 337: rotary diaphragm
338: first spherical bearing 350: return means
351: Returning disc 352: Second thrust bearing
355: return spring 357: second spherical bearing
358: Fixed frame 400: Horizontal rotating part
410: first stepping motor 420: first power transmitting portion
450: second stepping motor 460: second power transmission portion
500: Support bearing part 510: First oil free bearing
520: fixed support 530: second oil-less bearing
540: variable support 550: support spring
600: Rotating container 610: Rotating container body
620: cover

Claims (9)

A housing having an opening formed on an upper surface thereof;
A lower rotary shaft inserted in the opening portion and having a hollow lower rotation axis and an upper rotary shaft inserted in the hollow of the lower rotary shaft and rotated together with the lower rotary shaft, wherein the upper rotary shaft is rotatable about a rotation axis and;
A horizontal rotation part supported from the inner wall of the housing and rotating the lower rotation axis horizontally;
A vibrating part supported from the inner wall of the housing and connected to the upper rotating shaft to vibrate the upper rotating shaft up and down;
A supporting bearing part comprising a bearing surrounding the rotating shaft, and a support fixed to the inner surface of the housing to support the bearing; And
And a rotary container installed at an upper end of the upper rotary shaft. delete The method according to claim 1,
Wherein the horizontal rotating portion comprises a stepping motor and a power transmitting portion for horizontally rotating the rotating shaft by the power of the stepping motor. The method of claim 3,
Wherein the stepping motor comprises a first stepping motor and a second stepping motor, the power transmission part includes a first power transmission part receiving power from the first stepping motor and a second power transmission part receiving power from the second stepping motor, Wherein the first stepping motor and the second stepping motor alternately rotate the lower rotation shaft in opposite directions to each other. The method according to claim 1,
The vibrating portion is composed of a vibration generating means for generating vibration and transmitting the vibration to the upper rotary shaft to vary the upper rotary shaft in the vertical direction and a returning means for returning the upper rotary shaft, which is vertically variable due to the vibration generating means, Lt; / RTI > 6. The method of claim 5,
The vibration generating means includes a vibration generating source for generating vibration in the vertical direction, a vibration spring for receiving vibration from the vibration generating source, a first thrust bearing for receiving vibration from the vibration spring and varying in the vertical direction, And a rotary diaphragm that is integrally coupled to the upper rotary shaft and rotates to contact the first thrust bearing to receive the vibration of the first thrust bearing. The method according to claim 6,
The vibration source includes a vibration motor secured to the inner wall of the housing, an eccentric rotor eccentrically rotated by the vibration motor, and a hollow circular plate. The bottom of the vibration generator is vertically variable by being in contact with the eccentric rotor, And a first oscillation transmitting plate for transmitting the oscillation of the eccentric rotor to the oscillating spring. The method according to claim 6,
Wherein the vibration source is a hollow circular plate rotated integrally with the upper rotary shaft, the circular plate cam having a contact protrusion formed on its upper surface, a hollow circular plate into which the upper rotary shaft is inserted into the hollow, and a lower end of the vibration spring is fixed And a second vibration transmitting plate connected to the second vibration transmitting plate. 6. The method of claim 5,
Wherein the returning means includes a returning plate as a hollow disc, the upper rotating shaft being inserted into the hollow and rotating integrally with the upper rotating shaft, a second thrust bearing arranged on the returning disc to support the rotation of the returning disc, A second spherical bearing fixedly supported by a frame extending from an inner surface of the housing to support the first thrust bearing and a return spring for applying pressure to the upper surface of the second thrust bearing and extending from the inner surface of the housing, Wherein the upper frame comprises a fixed frame fixedly connected to the upper frame.

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