JP4603800B2 - Spheronization processing equipment - Google Patents

Description

  The present invention relates to a spheronization processing apparatus for spheroidizing various types of processing target powder (hereinafter referred to as “thermoplastic particles”) including a developing toner used in a copying machine.

  For the purpose of improving various physical properties such as fluidity, dispersibility, and charging characteristics of thermoplastic particles such as developing toner, spheroidizing of thermoplastic particles has been conventionally performed.

  Conventionally, as a processing apparatus for spheroidizing thermoplastic particles, a processing apparatus for injecting thermoplastic particles into hot air injected from a hot air injection nozzle and melting the surface of the thermoplastic particles by contact with the hot air to form a sphere. It is known (see Patent Document 1).

In the spheroidizing apparatus described in Patent Document 1, an annular raw material supply head is provided concentrically at the lower end outlet of the hot air injection nozzle, and the thermoplastic particles supplied to the inside of the raw material supply head are supplied to the raw material supply head. The thermoplastic particles are sprayed from a plurality of spray nozzles provided on the inner periphery of the lower end of the nozzle toward the hot air sprayed from the hot air spray nozzle, and the thermoplastic particles are made spherical by contact with the hot air.
Japanese Patent Laid-Open No. 10-263380

  By the way, in the spheroidizing apparatus described in Patent Document 1, when the raw material supply head is in contact with the hot air jet nozzle, the raw material supply head becomes high temperature, and the thermoplastic particles melt in the raw material supply head. Therefore, the cooling air is taken in by forming a gap between the outer periphery of the hot air injection nozzle and the inner peripheral surface of the raw material supply head.

  For this reason, the temperature gradient of the hot air injected from the hot air injection nozzle is high in the outer peripheral portion, and the high temperature portion is a very limited narrow range in the central portion, and the thermoplasticity from the outer periphery of such hot air toward the central portion Due to the structure in which the particles are sprayed, the amount of thermoplastic particles reaching the high temperature range is small, and the thermoplastic particles that do not reach the high temperature range are cooled and solidified with insufficient heat treatment, resulting in a decrease in circularity and variations. There was an inconvenience.

  An object of the present invention is to improve the spheroidizing efficiency of a spheroidizing apparatus by effectively bringing thermoplastic particles into contact with a high temperature portion of hot air jetted from a hot air jet nozzle.

In order to solve the above problems, in the present invention, a reaction tank, a hot air injection nozzle that injects hot air downward from the upper part of the reaction tank, and an outlet portion of the hot air injection nozzle are arranged. , a raw material injection nozzle for injecting the thermoplastic particles toward the center of the hot air ejected from the hot air nozzle, a raw material injection nozzle by hot air flowing provided outside the hot air nozzle of the feed injector nozzle A heat insulation mechanism that prevents the temperature from rising above the melting point of the thermoplastic particles and a gap between the lower end outlet of the raw material injection nozzle and the thermoplastic particles injected from the raw material injection nozzle are diffused outward by collision. In this way, a configuration comprising a collision member that is distributed and supplied into the hot air jetted from the hot air jet nozzle is adopted.

  In the present invention, in order to prevent the thermoplastic particles from adhering to the inner surface of the reaction tank, an air intake port for cooling air is provided at the upper part of the reaction tank.

  Furthermore, in this invention, in order to further improve the spheroidizing efficiency of the thermoplastic particles, a configuration is adopted in which the outlet at the lower end of the raw material injection nozzle is positioned higher than the hot air outlet at the lower end of the hot air injection nozzle.

  In the spheroidizing apparatus according to the present invention, a heat insulation mechanism having a configuration in which a cooling jacket is formed around the outer periphery of the raw material injection nozzle and the cooling medium flows in one direction in the cooling jacket is adopted. be able to.

  Moreover, you may make it provide the heat insulating material layer which interrupts | blocks the heat conduction to the raw material injection nozzle as an heat insulation mechanism in the outer peripheral surface of a raw material injection nozzle.

Furthermore, in this invention, in order to further increase the dispersion effect of the thermoplastic particles, an air injection passage extending in the axial direction along the outer periphery of the raw material injection nozzle is formed between the outer peripheral surface of the raw material injection nozzle and the heat insulating mechanism, The structure which injects air toward the upper surface of a collision member from the lower end opening of the air injection path is employ | adopted.

  In the present invention, in order to prevent the thermoplastic particles from adhering to and depositing on the lower surface of the collision member, a configuration in which an air film forming means for forming an air film is formed on the lower surface of the collision member is employed. .

  Here, the air film forming means may be configured to inject air from an air injection nozzle provided below the collision member toward the lower surface of the collision member, or an air supply in which the collision member is provided at the lower end portion. The cylinder is arranged on the axis of the raw material injection nozzle, and an air injection opening that opens at the center of the tapered surface formed on the lower surface of the collision member is provided at the lower end of the air supply cylinder. The air may be jetted.

  Alternatively, an air nozzle may be connected to the air injection port, and air may be injected along the tapered surface of the collision member from a plurality of air injection holes provided on the outer periphery of the lower end of the air nozzle.

  In the spheronization processing apparatus according to the present invention, in order to achieve a uniform temperature distribution in the circumferential direction of the hot air ejected from the hot air spray nozzle, the inner surface of the hot air spray nozzle is disposed between the outer peripheral surface of the heat insulation mechanism. A ring forming an annular hot air passage is attached.

  Further, in order to make the temperature distribution of the hot air uniform, a mesh is stretched between the inner peripheral surface of the hot air injection nozzle and the outer peripheral surface of the heat insulating mechanism.

  As described above, in the present invention, the hot air jetted from the hot air jet nozzle is at a high temperature at the center, and the thermoplastic particles are sprayed onto the high temperature portion. Can be brought into contact with each other, and a spheronization processing apparatus with high spheronization processing efficiency can be obtained.

  In addition, by providing a heat insulation mechanism that prevents the temperature inside the raw material injection nozzle from rising above the melting point of the thermoplastic particles due to contact with the hot air flowing in the hot air injection nozzle around the outer periphery of the raw material injection nozzle, It is possible to prevent the thermoplastic particles from being melted and fixed in the nozzle.

  Here, by providing an air inlet for cooling air at the top of the reaction tank, the thermoplastic particles that have been spheroidized by heat treatment by the cooling air flowing into the reaction tank from the air inlet can be quickly cooled. In addition, since the temperature rise on the inner surface of the reaction vessel can be suppressed, it is possible to prevent the thermoplastic particles from adhering to the inner surface of the reaction vessel.

  Further, when adopting a configuration in which the outlet of the lower end of the raw material injection nozzle is positioned above the hot air outlet of the lower end of the hot air injection nozzle, the thermoplastic particles injected from the raw material injection nozzle and hot air injected from the hot air injection nozzle While being able to make it contact immediately, since the time for which a thermoplastic particle flows in a high temperature part can be taken long, processing efficiency can be improved more.

  Here, as a heat insulating mechanism, when a configuration is adopted in which the refrigerant flows in a cooling jacket provided around the outer periphery of the raw material injection nozzle, it is possible to effectively prevent the temperature of the raw material injection nozzle from being increased by hot air. Can do.

  In addition, by providing a collision member at a distance from the lower end outlet of the raw material injection nozzle, thermoplastic particles can be dispersedly supplied into the hot air by collision with the collision member, and the spheroidization efficiency can be improved. Can do.

  When an air injection passage for injecting air toward the upper surface of the collision member is provided, the thermoplastic particles are more effectively dispersed by the reflected flow of the air injected onto the upper surface of the collision member. It can be improved further.

  In the spheroidizing apparatus provided with the collision member, by providing an air film forming means for forming an air film on the lower surface of the collision member, it is possible to prevent the thermoplastic particles from adhering to and depositing on the lower surface of the collision member. .

  If a ring that forms a hot air path between the inner surface of the hot air injection nozzle and the outer peripheral surface of the heat insulation mechanism is attached, the flow of hot air is disturbed by the ring and the hot air is agitated. Since the temperature of the hot air can be made uniform, the entire thermoplastic particles blown into the hot air can be effectively spheroidized.

  Further, when a mesh is stretched between the inner peripheral surface of the hot air jet nozzle and the outer peripheral surface of the heat insulating mechanism, the temperature of the hot air is made uniform by the mesh, and the thermoplastic particles sprayed into the hot air in the same manner as described above. Can be effectively spheroidized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the reaction vessel 1 has a tapered shape having a smaller diameter as it reaches the lower portion, and a top plate 2 is provided on the upper side thereof. The top plate 2 has a first air intake 3 at the center and a second air intake 4 at the outer periphery.

  A hot air jet nozzle 5 is provided above the reaction tank 1. The hot air injection nozzle 5 is L-shaped, and the outlet 5a at the lower end is disposed on the same axis as the first air intake 3 so that hot air is injected into the reaction tank 1 from the outlet 5a. Yes.

  As shown in FIG. 2, the lower end portion of the raw material injection nozzle 6 is disposed inside the outlet portion of the hot air injection nozzle 5. The upper portion of the raw material injection nozzle 6 penetrates the bent portion of the hot air injection nozzle 5, the upper portion facing the outside is provided with a hopper portion 6a for storing thermoplastic particles, and the diffuser 7 is provided below the hopper portion 6a. ing. Further, an air injection nozzle 8 for injecting compressed air toward the diffuser 7 is provided in the hopper portion 6a, and when the compressed air is injected from the air injection nozzle 8 to the diffuser 7, the heat stored in the hopper portion 6a. The plastic particles are sucked into the raw material injection nozzle 6 and mixed with compressed air, and the solid-gas mixed fluid is injected from the lower end outlet 6b of the raw material injection nozzle 6 toward the center of hot air injected from the hot air injection nozzle 5. It has become so.

  A collision member 9 is provided below the material injection nozzle 6 to disperse the thermoplastic particles injected from the material injection nozzle 6 by collision. As shown in FIG. 3 (I), the collision member 9 is a disc-shaped member, but the shape of the collision member 9 is not limited to this. For example, it may be conical or frustoconical with a sharp upper end, or may be conical at the top and bottom as shown in FIG.

  A heat insulating mechanism 10 is provided outside the raw material injection nozzle 6 to prevent the temperature of the raw material injection nozzle 6 from rising above the melting point of the thermoplastic particles due to contact with hot air flowing through the hot air injection nozzle 5. The heat insulation mechanism 10 is provided with a cooling jacket 11 between an inner cylinder portion 10a provided outside the raw material injection nozzle 6 and an outer cylinder portion 10b provided outside thereof, and a refrigerant inlet 12 is provided below the cooling jacket 11; A refrigerant outlet 13 is provided in the upper part, and a refrigerant is supplied from the refrigerant inlet 12 into the cooling jacket 11 to cool the raw material injection nozzle 6, and the cooled refrigerant flows out of the refrigerant outlet 13.

  Here, a 50% aqueous solution of ethylene glycol at −15 ° C. is used as the refrigerant, but water or air may be used as the refrigerant.

  An air injection passage 30 is provided between the inner periphery of the inner cylinder portion 10 a of the heat insulating mechanism 10 and the outer periphery of the raw material injection nozzle 6. An air inlet 31 is provided in the upper part of the air injection passage 30, and the air supplied from the air inlet 31 into the air injection passage 30 flows downward in the air injection passage 30 and passes through the opening 32 at the lower end of the collision member 9. It is jetted toward the upper surface.

  The spheroidizing apparatus shown in the embodiment has the above-described structure, and in the spheroidizing process of thermoplastic particles, hot air is injected from the hot air injection nozzle 5 into the reaction tank 1 and from the air injection passage 30 to the collision member 9. In a cooling state in which air is injected and the refrigerant flows into the cooling jacket 11, a solid-gas mixed fluid of thermoplastic particles and compressed air is injected from the raw material injection nozzle 6.

  When thermoplastic particles are injected from the raw material injection nozzle 6, the thermoplastic particles collide with the collision member 9. Since the thermoplastic particles are dispersed in the hot air by the collision and the air jetted from the air jet passage 30 toward the upper surface of the collision member 9, the thermoplastic particles come into effective contact with the hot air. In addition, the hot air is hot at the center, and the thermoplastic particles are jetted in the high temperature region, so the thermoplastic particles effectively come into contact with the hot air, and the contact melts the surface and makes it spherical. Is done.

  During the spheronization treatment as described above, cooling air flows into the reaction tank 1 from the first air intake port 3 and the second air intake port 4, and the thermoplastic particles that have been spheroidized by the cooling air are undissolved. Cools quickly.

  Further, the inner surface of the reaction tank 1 is cooled by the cooling air flowing from the second air intake 4. For this reason, the spheroidized thermoplastic particles are discharged from the lower outlet of the reaction tank 1 without adhering to the inner surface of the reaction tank 1.

  As described above, the thermoplastic particles injected from the raw material injection nozzle 6 are brought into a high temperature region at the center of the hot air by the collision with the collision member 9 and the air injected from the air injection passage 30 toward the upper surface of the collision member 9. Since the dispersion is supplied, the hot air and the thermoplastic particles can be brought into contact with each other very effectively, and the spheroidizing treatment of the thermoplastic particles can be performed efficiently.

  In addition, since the coolant is caused to flow through the cooling jacket 11 during the spherical processing of the thermoplastic particles, it is possible to prevent the temperature of the raw material injection nozzle 6 from rising above the melting point of the thermoplastic particles due to contact with hot air. It is possible to prevent the thermoplastic particles from melting and adhering to and depositing on the inner surface of the raw material injection nozzle 6.

  As shown in FIG. 3I, if a tapered surface 6c is provided on the outer periphery of the lower surface of the raw material injection nozzle 6, it is possible to prevent the vortex from being generated at the lower end of the raw material injection nozzle 6. It is possible to prevent the thermoplastic particles from adhering to the lower surface of the injection nozzle 6 to melt and accumulate.

  Further, when a throttle 6d is provided at the lower part of the raw material injection nozzle 6, the solid-gas mixed fluid of thermoplastic particles and compressed air is rapidly accelerated by the throttle 6d, and the dispersion force acts on the thermoplastic particles by the shear force of the air flow. Therefore, it is possible to prevent the particles from adhering and aggregating.

3 (I) and (II), the outlet 5a at the lower end of the hot air injection nozzle 5 and the outlet 6b at the lower end of the raw material injection nozzle 6 are held at substantially the same height . As shown in III), when the outlet 6b at the lower end of the raw material injection nozzle 6 is positioned above the outlet 5a at the lower end of the hot air injection nozzle 5 by a dimension H, the thermoplastic particles injected from the raw material injection nozzle 6 are hot air. Since the thermoplastic particles can be brought into contact with each other immediately and the thermoplastic particles can flow for a long time in the high temperature region of the hot air, the thermoplastic particles can be spheroidized more effectively.

  4 and 5 show another example of the heat insulating mechanism 10 that prevents the temperature of the raw material injection nozzle 6 from rising. In the heat insulation mechanism 10 shown in FIG. 4, a cylindrical first chamber 14 is provided outside the raw material injection nozzle 6, and a second chamber 15 communicating with the first chamber 14 at the lower portion is provided outside the first chamber 14. A refrigerant inlet 16 is provided at the upper part of 14, and the refrigerant supplied from the refrigerant inlet 16 to the first chamber 14 flows downward and flows into the lower part of the second chamber 15, and the second chamber 15 flows upward. It is made to flow out from the refrigerant outlet 17 provided in the upper part of the second chamber 15.

  In the heat insulating mechanism 10, since the two heat insulating layers are formed by the refrigerant in the first chamber 14 and the refrigerant in the second chamber 15, the temperature rise of the raw material injection nozzle 6 due to hot air is more effectively prevented. be able to.

  In the heat insulation mechanism 10 shown in FIG. 5, a cooling cylinder 18 is provided outside the raw material injection nozzle 6, and the inside of the cooling cylinder 18 is partitioned into a supply chamber 20 and a cooling chamber 21 by a partition plate 19. A plurality of conduits 22 whose upper portions communicate with the supply chamber 20 are provided at intervals in the circumferential direction. A refrigerant inlet 23 is provided in the supply chamber 20, and the refrigerant supplied from the refrigerant inlet 23 into the supply chamber 20 is conduitd. The refrigerant flows downward in the interior 22, and the refrigerant flowing into the lower part of the cooling chamber 21 from the lower end of each conduit 22 flows upward and flows out from the refrigerant outlet 24 provided in the upper part of the cooling chamber 21.

  The heat insulation mechanism 10 can also effectively prevent the raw material injection nozzle 6 from being heated by hot air.

  FIG. 6 shows another embodiment of the spheronization processing apparatus according to the present invention. This embodiment is different from the spheroidizing apparatus of the embodiment shown in FIG. 2 in that an air film forming means 40 for forming an air film is provided on the lower surface of the collision member 9.

  For this reason, the same components as those in the spheroidizing apparatus shown in FIG.

  Here, the air film forming means 40 is provided with an air injection nozzle 41 below the collision member 9, and injects air from the air injection nozzle 41 toward the lower surface of the collision member 9, and air is applied to the lower surface of the collision member 9. A film is formed.

  By forming an air film on the lower surface of the collision member 9 as described above, it is possible to prevent the thermoplastic particles that have been spheroidized by melting the surface from adhering to and depositing on the lower surface of the collision member 9. .

  7 and 8 show another example of the air film forming means 40 that forms an air film on the lower surface of the collision member 9. In this example, an air supply cylinder 42 is provided on the axial center in the raw material injection nozzle 6, an air header 43 is connected to an upper end portion located in the hopper portion 6 a of the air supply cylinder 42, and the lower end of the raw material injection nozzle 6. A trumpet-shaped collision member 9 having upper and lower tapered surfaces 9a and 9b is provided at the lower end portion located below the upper end of the air supply tube 42, and the large-diameter air injection port 42a provided at the lower end of the air supply cylinder 42 9 is opened at the center of the lower taper surface 9b, and the air supplied from the air header 43 to the air supply cylinder 42 is sprayed outwardly from the air injection port 42a, along the lower taper surface 9b of the collision member 9. An air film is formed.

  Also in the example shown in FIGS. 7 and 8, it is possible to prevent the thermoplastic particles subjected to the spheroidizing treatment from adhering to and depositing on the lower tapered surface 9 b of the collision member 9.

  7 and 8, since the air header 43 is provided in the hopper portion 6a, it is difficult to provide the air injection nozzle 8 shown in FIG. 2 in the hopper portion 6a.

  Therefore, an annular groove 7a is provided on the outer periphery of the diffuser 7 and a plurality of injection holes 7b that communicate with the annular groove 7a and open at the lower surface of the diffuser 7. The material injection nozzle 6 has an annular groove 7a on the outer periphery thereof. A communicating air inlet 7c is formed, and high-pressure air supplied from the air inlet 7c to the annular groove 7a is injected into the raw material injection nozzle 6 from the plurality of injection holes 7b to give a suction force in the diffuser 7, The thermoplastic particles in the hopper portion 6a are sucked into the raw material injection nozzle 6 by the suction force and injected from the opening at the lower end.

  Since the other configuration is the same as the spheronization processing apparatus shown in FIG.

  FIG. 9 shows still another example of the air film forming means 40. This example is different from the air film forming means 40 shown in FIG. 8 in that a mesh 44 is stretched at the lower end of the trumpet-shaped collision member 9.

  As described above, by stretching the mesh 44 at the lower end of the collision member 9, the pressure in the space 44a formed between the mesh 44 and the lower tapered surface 9b of the collision member 9 is made uniform. Since the air in the space 44a is uniformly ejected from the entire mesh 44, it is possible to more effectively prevent the thermoplastic particles that have been spheroidized from adhering and depositing on the lower surface of the collision member 9.

  FIG. 10 shows another example of the air film forming means 40. In this example, an air nozzle 45 is mounted in an air injection port 42 a provided at the lower end of the air supply cylinder 42, and an air injection hole 46 for injecting air along the lower tapered surface 9 b of the collision member 9 is provided in the air nozzle 45. ing. Here, the air injection hole 46 includes an axial vertical hole 46a communicating with the air supply cylinder 42 and a plurality of horizontal holes 46b communicating with the vertical hole 46a. The supplied air is jetted from each of the plurality of lateral holes 46 b to form an air film on the lower tapered surface 9 b of the collision member 9.

  Here, as shown in FIGS. 11 (I) and (II), the horizontal holes 46b may extend radially around the vertical holes 46a, or as shown in FIG. 11 (III). Further, it may extend in the outer peripheral tangential direction of the vertical hole 46a.

  In the example shown in FIG. 11 (II), a small-diameter hole 46c that opens at the lower surface of the air nozzle 45 is provided at the lower end of the vertical hole 46a, and air is jetted from the small-diameter hole 46c downward to the air nozzle 45. ing.

  In the spheroidizing apparatus shown in FIG. 2, since the hot air injection nozzle 5 is L-shaped, the flow velocity of the hot air flowing in the hot air injection nozzle 5 is fast on the large diameter side of the bent portion 5b and slow on the small diameter side. There is a slight difference in the temperature distribution in the circumferential direction of the hot air flowing out from the outlet 5a.

  At this time, there is a possibility that a uniform product cannot be obtained due to a slight difference in the spheroidizing speed of the thermoplastic particles injected into the high temperature region of the hot air and the thermoplastic particles injected into the low temperature region.

  In order to solve such a problem, it is preferable to make the temperature uniform in the circumferential direction of the hot air jetted from the outlet 5a of the hot air jet nozzle 5.

  Therefore, in FIG. 12, a ring 48 is attached to the inner periphery of the outlet portion of the hot air injection nozzle 5, and a hot air passage 49 is provided between the inner periphery of the ring 48 and the outer peripheral surface of the outer cylinder portion 10 b of the heat insulating mechanism 10.

  As described above, by attaching the ring 48 to the inner periphery of the outlet portion of the hot air injection nozzle 5, the hot air is disturbed and mixed on the inlet side of the ring 48 and mixed in the circumferential direction of the hot air flowing out from the outlet 5a. The temperature distribution can be made uniform.

  Further, in FIG. 13, a metal mesh 50 is attached between the inner peripheral surface of the outlet portion of the hot air injection nozzle 5 and the outer peripheral surface of the outer cylinder portion 10 b of the heat insulating mechanism 10.

  As described above, since the mesh 50 gives resistance to the flow of hot air by attaching the mesh 50, the hot air is disturbed on the inlet side of the mesh 50 and mixed on the outlet side of the mesh 50. The temperature distribution in the circumferential direction of the hot air flowing out from the air can be made uniform.

  Here, if a large-diameter ring 51 supported on the inner periphery of the hot air injection nozzle 5 and a small-diameter ring 52 supported on the outer periphery of the outer cylinder portion 10b are attached to the outer periphery of the mesh 50, the outer cylinder portion 10b is injected with hot air. Since it can hold | maintain coaxially with the exit part of the nozzle 5, the amount of hot air which flows out from the exit 5a can be equalize | homogenized.

Longitudinal front view showing an embodiment of a spheronization processing apparatus according to the present invention Sectional drawing which expands and shows the part of the hot air injection nozzle of FIG. (I) thru | or (III) is sectional drawing which shows each example of supply of the thermoplastic particle with respect to hot air Sectional drawing which shows the other example of the heat insulation mechanism of a raw material injection nozzle Sectional drawing which shows the further another example of the heat insulation mechanism of a raw material injection nozzle Sectional drawing which shows the other example of the spheroidization processing apparatus based on this invention Longitudinal front view showing another example of the air film forming means of the spheroidizing apparatus according to the present invention Sectional drawing which expands and shows the attachment part of the collision member of FIG. Sectional drawing which shows the other example of the air film formation means of the spheroidization processing apparatus which concerns on this invention Sectional drawing which shows the further another example of the air film formation means of the spheroidization processing apparatus which concerns on this invention (I) thru | or (III) is sectional drawing which shows each example of the air nozzle shown in FIG. Sectional drawing which shows the other example of the spheroidization processing apparatus based on this invention Sectional drawing which shows the further another example of the spheroidization processing apparatus which concerns on this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reaction tank 3 1st air intake 4 2nd air intake 5 Hot-air injection nozzle 6 Raw material injection nozzle 9 Collision member 9a, 9b Tapered surface 10 Heat insulation mechanism 11 Cooling jacket 30 Air injection path 40 Air film formation means 41 Air injection nozzle 42 Air supply cylinder 42a Air injection port 45 Air nozzle 46 Air injection hole 48 Ring 49 Hot air channel 50 Mesh

Claims (11)

A reaction tank, a hot air injection nozzle that injects hot air downward from the upper part of the reaction tank, and an outlet portion of the hot air injection nozzle, and is directed to the center of the hot air injected from the hot air injection nozzle to prevent a raw material injection nozzle for injecting the thermoplastic particles, from the raw material injection nozzle by hot air flowing through the hot air nozzle provided outside of the raw material injection nozzle to the temperature rises above the melting point of the thermoplastic particles Te A heat insulation mechanism and a lower end outlet of the raw material injection nozzle are provided at intervals, and the thermoplastic particles injected from the raw material injection nozzle are diffused outward by collision and dispersed in the hot air injected from the hot air injection nozzle. A spheronization processing device comprising a collision member to be supplied . The spheroidizing apparatus according to claim 1, wherein an air intake port for cooling air is formed in a central portion of the top plate of the reaction tank and in the periphery thereof .   The spheroidizing apparatus according to claim 1 or 2, wherein an outlet at a lower end of the raw material injection nozzle is positioned above a hot air outlet at a lower end of the hot air injection nozzle.   The spheroidization according to any one of claims 1 to 3, wherein the heat insulating mechanism is configured to form a cooling jacket around the outer periphery of the raw material injection nozzle and to flow the cooling medium in one direction in the cooling jacket. Processing equipment. 5. The air injection passage according to claim 1, wherein a lower end is opened between the outer peripheral surface of the raw material injection nozzle and the heat insulation mechanism, and an air injection passage is provided for injecting air from the opening toward the upper surface of the collision member . 4. A spheronization processing apparatus according to 1. Sphering treatment device according to any one of claims 1 to 5 provided with the air film forming means for forming an air film on the lower surface of the collision member. The spheroidization processing apparatus according to claim 6 , wherein the air film forming means includes an air injection nozzle that injects air toward a lower surface of the collision member . The air film forming means has an air supply cylinder arranged on the axis of the raw material injection nozzle and provided with the collision member at the lower end, and the air injection port at the lower end of the air supply cylinder is provided on the lower surface of the collision member 7. The spheroidizing apparatus according to claim 6 , wherein the spheroidizing apparatus is configured to open at the center of the tapered surface formed in the air and to inject air from the air injection port along the tapered surface . The spheroidizing apparatus according to claim 8 , wherein an air nozzle is connected to the air injection port, and a plurality of air injection holes for injecting air along the tapered surface of the collision member are formed in the air nozzle . The spheronization processing apparatus according to any one of claims 1 to 9 , wherein a ring that forms an annular hot air passage between the outer peripheral surface of the heat insulating mechanism is attached to an inner peripheral surface of the outlet portion of the hot air injection nozzle . The spheronization processing apparatus according to any one of claims 1 to 9 , wherein a mesh is stretched between an inner peripheral surface at an outlet portion of the hot air injection nozzle and an outer peripheral surface of the heat insulating mechanism .

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