WO2016194669A1

WO2016194669A1 - Method for discharging residue in powder processing devices and system for discharging residue in powder processing devices

Info

Publication number: WO2016194669A1
Application number: PCT/JP2016/065126
Authority: WO
Inventors: 久継高島; 章二酒井
Original assignee: 株式会社奈良機械製作所
Priority date: 2015-06-03
Filing date: 2016-05-23
Publication date: 2016-12-08
Also published as: JPWO2016194669A1; JP6215509B2

Abstract

Provided is a method to discharge power remaining inside a casing of a powder processing device. The present invention is a method for discharging residue in a powder processing device that comprises a casing, a supply port provided on top at one end of the casing, and a discharge port provided on the bottom at the other end of the casing and that moves powder in the casing toward the discharge port by the powder being pushed by powder introduced from the supply port, wherein the method comprises a powder introduction stop step to stop the introduction of powder from the supply port after the powder processing completes, and a sublimable solid particle introduction step to introduce sublimable solid particles that sublimate at normal temperature and pressure from the supply port.

Description

Residue discharging method of powder processing apparatus and residue discharging system of powder processing apparatus

The present invention relates to a method for discharging a residue from a powder processing apparatus.

Conventionally, like patent document 1, the powder processing apparatus which processes in a casing for the purpose of drying etc. is proposed.
In the powder processing apparatus, the powder in the casing is sequentially moved toward the discharge port and discharged by the pushing force of the powder input from the supply port.

JP 2004-150641 A

However, when the supply of the powder from the supply port is stopped after the processing, the extrusion effect is reduced, and there is a problem that the powder remains in the casing.
As shown in FIGS. 7 and 8, the powder remains at least in the gap between the inner peripheral surface of the casing 1 and the outermost peripheral raceway surface of the scraping plate 16 of the rotating body 15. Although it depends on the physical properties of the powder, the powder having a larger angle of repose (evaluation method on the fluidity of the powder) remains in a mountain shape between the adjacent rotary bodies 15.
Specifically, after the supply of the powder is stopped, the effective volume of the casing 1 is 15 even if the rotating body 15 is rotated for a long time or the powder having good fluidity such as the powder of synthetic resin. In the case of powder having poor fluidity such as wheat flour, 30% or more of the effective volume of the casing 1 remains.
The powder that remains in this way depends on the type, structure, and size of the powder processing device, but the inspection port and cover are removed. The powder that was discharged and was not removed was washed off with water, and then the inspection port and cover that were removed were attached, and the inside of the device was dried to prepare for the next treatment.
As a result, there is a problem that not only the productivity is poor due to the time required for the next treatment, but also a large amount of waste is generated and a large-scale wastewater treatment device is required.

Therefore, an object of the present invention is to provide a method and a discharge system for discharging powder remaining in the casing after the powder processing is completed in the powder processing apparatus.

A residue discharge method according to the present invention includes a casing, a supply port provided at an upper portion of one end portion of the casing, and a discharge port provided at a lower portion of the other end portion of the casing. Is a residue discharge method in a powder processing apparatus in which the powder in the casing is pushed toward the discharge port and moves toward the discharge port. A powder charging stop step for stopping charging, and a sublimable solid particle charging step for charging sublimable solid particles that sublime at room temperature and normal pressure from the supply port after the powder charging stop step.

The powder remaining in the casing can be pushed out and discharged by sublimable solid particles.

The sublimable solid particles exfoliate the adhered powder in the casing by volume expansion during sublimation, and then the sublimable solid particles are naturally discharged together with the powder from the casing, so that the residual powder in the casing is discharged. In addition, a cleaning effect in the casing can be obtained. Since the sublimable solid particles and powder discharged are vaporized at room temperature and normal pressure, the sublimable solid particles do not need to be separated from the residual powder, and the residual powder can be used as a processed product as it is.

Preferably, the powder processing apparatus has a dam plate for damming the powder moving toward the discharge port in the casing, and an opening for discharging the powder in the casing at a lower portion of the dam plate, The opening is in a closed state during powder processing, and the opening is in an open state after the powder charging stop step and until the sublimable solid particle charging step. , Closed during the sublimable solid particle charging step.

Preferably, the heat exchanger further includes a shaft that is pivotally mounted on the casing and on which a plurality of rotating bodies are arranged, the rotating body is hollow, a heat exchange medium passes through the inside, and the powder inside the casing is heated or cooled. The powder charging stop step and the sublimable solid particle charging step are performed in a state where the heat exchange medium is continuously supplied to the rotating body via the shaft.

More preferably, the shaft is formed of a metal having a body-centered cubic lattice.

Also preferably, the sublimable solid particles are dry ice particles.

By controlling the opening of the opening in the powder charging stop step and sublimable solid charging step after powder processing, the powder in the casing is discharged, the sublimable solid particles remaining after the powder discharge, and the post-sublimation This gas can be effectively discharged from the casing.

The residue discharge system according to the present invention includes a casing, a shaft that is pivotally mounted on the casing and on which a plurality of rotating bodies are disposed, a supply port provided at an upper portion of one end of the casing, and the other of the casing. A powder processing device that has a discharge port provided at the lower part of the end, processes the powder charged from the supply port in the casing, and discharges the powder from the discharge port; and sublimates at room temperature and normal pressure The powder processing apparatus is configured to move the powder in the casing toward the discharge port by the pushing force of the powder input from the supply port. The sublimable solid particles are introduced from the inlet.

Preferably, the sublimable solid particles are dry ice particles having an average particle size of 3 to 10 mm.

More preferably, the dry ice particles have a cylindrical shape having a cross-sectional diameter of 5 mm or less and a length of 20 mm or less.

As described above, according to the present invention, in a powder processing apparatus, a method of efficiently discharging powder remaining in a casing in a short time using the plug flow property (also referred to as piston flow property) of powder. And discharge system can be provided.

It is a partially broken whole block diagram of the powder processing apparatus in this embodiment. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 2 is a sectional view taken along line BB in FIG. It is sectional drawing which shows the circumference | surroundings of a discharge plate, and shows the state by which the discharge plate was closed. It is sectional drawing which shows the circumference | surroundings of a discharge plate, and shows the state by which the discharge plate was opened. It is a perspective view of the dry ice particle used in this embodiment. In the prior art, a powder having poor fluidity remains in the powder processing apparatus. The prior art shows a state in which powder having good fluidity remains in the powder processing apparatus.

Hereinafter, this embodiment will be described with reference to the drawings.

The residue discharge system of the powder processing apparatus including the stirring-type drying apparatus in the present embodiment includes a casing 1, a first support base 2a, a second support base 2b, a jacket 3, a heat exchange medium distribution pipe 4, and a heat exchange medium discharge. Pipe 5, hollow shaft 6, front bearing 7, rear bearing 8, gear 9, sprocket 10, first rotary joint 11a, second rotary joint 11b, heat exchange medium supply pipe 12, heat exchange medium discharge pipe 14 , Rotating body 15, scraping plate 16, cover 17, supply port 18, powder distribution pipe 19, quantitative supply device 20, weir plate (overflow gate) 21, discharge plate (underflow gate) 22, discharge port 23, fastening Tool 24, discharge plate opening / closing shaft 25, front carrier gas inlet 26, rear carrier gas inlet 27, carrier gas outlet 28, exhaust pipe 29, powder separator 30, exhaust Blower 31, dry ice particle buffer tank 32, dry ice particle supply pipe 33, first shaft support (support) 34, second shaft support (support) 35, bearing 36, handle 37, rotary valve 38, heat exchange medium A circulation path 39 and a notch (opening) 40 are provided (see FIGS. 1 to 6).

FIG. 1 shows a portion where these members are present so that the structure around the rotating body 15 and the scraping plate 16 that cannot be seen from the outside, and the structure around the dam plate 21 and the discharge plate 22 can be seen. A part of the casing 1 is cut away to show the inner structure.

The casing 1 extends in a substantially horizontal direction, has a substantially U-shaped cross section, and forms a substantially W-shaped arc shape at the bottom. A jacket 3 forming an exchange medium circulation path 39 is provided.

The casing 1 is supported by a first support 2a and a second support 2b.
The first support 2a and the second support 2b support the casing 1 in a horizontal state or in a state where the first support 2a and the second support 2b are inclined so that the second support 2b side (discharge port 23 side) is lowered.
In this embodiment, the 1st support stand 2a side is made into the front part of an apparatus, and the 2nd support stand 2b side is made into the rear part of an apparatus.

The heat exchange medium distribution pipe 4 is provided at the front end of the jacket 3 for the inlet of the heat exchange medium passing through the heat exchange medium circulation path 39.

The heat exchange medium discharge pipe 5 is provided at the rear end of the jacket 3 for the outlet of the heat exchange medium passing through the heat exchange medium circulation path 39.

Inside the casing 1, two shafts 6 penetrate in parallel in the longitudinal direction and are held in a rotatable state by a bearing 7 provided at the front part of the casing 1 and a bearing 8 provided at the rear part (shaft rack) )

A gear 9 is provided at each front portion of the shaft 6, and both the gears 9 are meshed so as to rotate in opposite directions.

A sprocket 10 is provided on one side of the shaft 6 and connected to a motor (not shown) via a chain (not shown) hung on the sprocket 10.

The front end of each shaft 6 is connected to the heat exchange medium supply pipe 12 through the first rotary joint 11a.
The rear end of each shaft 6 is connected to the heat exchange medium discharge pipe 14 via the second rotary joint 11b.

Each of the shafts 6 is provided with a plurality of rotating bodies 15 at regular intervals.
In this embodiment, a hollow fan-shaped heat exchanger is used as the rotating body 15.

The rotating body 15 is formed in a wedge shape so that the front end in the rotation direction is narrow, and a scraping plate 16 is provided at a wide rear end. Then, two such rotating bodies 15 are arranged as a set, and the two rotating bodies 15 are arranged so as to have a point-symmetrical positional relationship around the shaft 6 as shown in FIG. Further, the two rotating bodies 15 are arranged so that the front end of one rotating body 15 faces the rear end of the other rotating body 15 and at a certain interval, that is, with a gap provided. .
The scraping plate 16 scrapes the powder in the same direction as the rotation direction.
The rotating body 15 provided on the shaft 6 is not limited to a hollow fan blade shape, and may be a hollow disk shape without a gap.
Further, the rotating body 15 may be arranged so that there are one or three or more gap portions.

As shown in FIG. 2, the two shafts 6 are preferably disposed in the casing 1 with their phases shifted so that the gap between the pair of rotating bodies 15 is shifted by approximately 90 degrees.
As shown in FIG. 2, the rotating body 15 is provided at the same position in the axial direction (arranged so that the front rotating body 15 and the rear rotating body 15 overlap each other when viewed from the axial direction). A configuration may be adopted in which rotating bodies 15 adjacent to each other in the front-rear direction (axial direction) on one axis are arranged in a spiral manner in the axial direction with a phase shifted by a constant angle.

The shaft 6 is provided with two communicating holes for each rotating body 15 so that the shaft 6 and the rotating body 15 communicate with each other.
Then, the heat exchange medium supplied to the heat exchange medium supply pipe 12 enters the shaft 6 via the first rotary joint 11a, and then enters the rotating body 15 via one communication hole, and passes through the other communication hole. To the shaft 6 and discharged from the heat exchange medium discharge pipe 14 via the second rotary joint 11b.
When the heat exchange medium passes, the shaft 6 and the rotating body 15 function as a heat exchanger that heats, dries, and cools the powder in the casing 1.

In the present embodiment, the form in which two shafts 6 are provided has been described. However, the number of shafts 6 is not limited to two, and may be one or three or more.

A cover 17 is provided on the upper portion of the casing 1.

A treatment powder supply port 18 is provided at the front end of the cover 17.
The supply port 18 is connected to a powder quantitative supply device 20 via a powder distribution pipe 19.

At the rear part of the casing 1, a dam plate 21 is provided for retaining a certain amount of treated powder in the casing 1 (damming).
A part of the lower part of the dam plate 21 is cut out, and the cutout part (opening part) 40 is movable for discharging the powder in the casing 1 during natural discharge processing, which will be described later. A discharge plate 22 of the type is provided.

At the rear end of the casing 1 (downstream of the dam plate 21), the processed powder that has passed over the dam plate 21 and the powder discharged from the open opening 40 are discharged out of the casing 1. A discharge port 23 is provided.

The discharge plate 22 is fixed to the discharge plate opening / closing shaft 25 by a fastener 24 so as to be rotatable (see FIGS. 3 to 5).
The discharge plate opening / closing shaft 25 is supported by a first shaft support member 34, a second shaft support member 35, and a bearing 36, and a handle 37 is provided at the tip thereof.
In conjunction with the rotation of the handle 37, the discharge plate 22 rotates about the discharge plate opening / closing shaft 25 as a fulcrum, thereby opening and closing the opening 40.

A front carrier gas inlet 26 is provided at the front end of the cover 17, and a rear carrier gas inlet 27 is provided at the rear end of the cover 17.
The front carrier gas inlet 26 and the rear carrier gas inlet 27 are provided with carrier gas (air, non-volatile) for discharging volatile components (water vapor, organic solvent, etc.) evaporated from the treated powder in the casing 1 to the outside of the system. Active gas etc.) are introduced.

The carrier gas is discharged from a carrier gas discharge port 28 provided in the vicinity of the intermediate portion of the cover 17.
The carrier gas discharge port 28 is connected to an exhaust blower 31 via an exhaust pipe 29 and a powder separator 30 such as a cyclone.

The dry ice particle buffer tank 32 is provided upstream of the powder quantitative supply device 20. When the dry ice particles are discharged from the residual powder in the casing 1, the rotary ice 38, the dry ice particle supply pipe 33, The powder is supplied into the casing 1 via a powder quantitative supply device 20.

The dry ice particle buffer tank 32 is connected to a dry ice generator (not shown), and the dry ice particles produced by the dry ice generator are continuously supplied to the dry ice particle buffer tank 32. Alternatively, the purchased dry ice particles may be put into the dry ice particle buffer tank 32 all at once.

Next, a procedure (drying procedure) for drying powder using this stirring type drying apparatus will be described.

First, the operator supplies a heat exchange medium such as warm water, water vapor, and heat transfer oil heated to a predetermined temperature to the heat exchange medium circulation path 39 and the shaft 6.
When the heat exchange medium is water vapor, the water vapor supplied to the heat exchange medium circulation path 39 heats the casing 1, and then the water vapor becomes a condensate and is discharged from the heat exchange medium discharge pipe 5.
The steam supplied to the shaft 6 heats the shaft 6 and the rotator 15 and then becomes a condensate and is discharged from the heat exchange medium discharge pipe 14.

Next, the operator drives the motor to rotate the two shafts 6 at a constant rotational speed. At this time, the opening 40 is kept closed.

After the temperatures of the heat exchange medium circulation path 39 and the rotating body 15 become constant, the operator operates the powder quantitative supply device 20 to continuously supply the processed powder into the casing 1.

The treated powder supplied into the casing 1 is pressed by the powder supplied from the quantitative supply device 20, that is, the treated powder supplied later, the pressure due to the filling height at the supply port 18, and as required. The gap between the pair of rotating bodies 15 while receiving a thrust in a direction parallel to the shaft 6 (rear direction) due to the inclination of the casing 1 provided and the rotation of the shaft 6 and maintaining a certain degree of fullness. The inside of the casing 1 gradually moves to the side of the dam plate 21 through the portion and the gap between the inner peripheral surface of the casing 1 and the rotating body 15.

In the process of moving in the casing 1, the powder is stirred by the rotation of the rotating body 15 and heated by the rotating body 15 and the casing 1.

When the powder charged at the start of operation, that is, the pre-filled powder reaches the end of the casing 1, that is, the end, it is blocked by the dam plate 21, so that the powder layer in the casing 1 gradually increases.
When the height of the powder layer exceeds the upper end of the dam plate 21, the powder is discharged from the upper end of the dam plate 21 through the discharge port 23.

Volatile components evaporated from the powder heated by the rotator 15 or the casing 1 are supplied from the front carrier gas inlet 26 and the rear carrier gas inlet 27 and pass through the powder upper layer of the casing 1. The exhaust gas is discharged from the carrier gas outlet 28 through the exhaust pipe 29, the powder separator 30, and the exhaust blower 31.
The fine powder discharged along with the carrier gas is separated from the carrier gas by the powder separator 30 and collected.

Next, a method for discharging the residue after drying the treated powder will be described.

First, powder is discharged without using dry ice particles (natural discharge).
The operator stops supplying powder to the quantitative supply device 20 or supplying powder from the quantitative supply device 20, and after continuing the drying process for a while, rotates the discharge plate opening / closing shaft 25 using the handle 37. Then, the opening 40 is opened (powder charging stop step).

The powder in the casing 1 is subjected to thrust in a direction parallel to the shaft 6 (rear direction) due to the pressure depending on the filling height, the inclination of the casing 1 provided as necessary, the rotation of the shaft 6 and the like, and continues. The casing 1 moves toward the opening 40 and is discharged from the opening 40 through the discharge port 23 to the outside of the apparatus.
However, all the powder in the casing 1 cannot be discharged and varies depending on the physical properties of the treated powder, but in the case of a powder with poor fluidity, the powder shown in FIG. Even in the case of a body, as shown in FIG. 8, the gap between the inner peripheral surface of the casing 1 and the outermost track surface of the scraping plate 16 of the rotating body 15, or the rotating body 15 adjacent to the rotating body 15 in the front-rear direction. In between, powder remains.

Next, dry powder is discharged using dry ice particles.

When the powder discharged from the discharge port 23 is reduced by the natural discharge process described above, the operator rotates the discharge plate opening / closing shaft 25 using the handle 37 and closes the opening 40 again. At this time, in order to protect the casing 1, the shaft 6 and the rotary joint 11, it is preferable that the supply of the heat exchange medium is continued during the powder charging stop step and the dry ice charging step described later.

If the supply of the heat exchange medium is stopped at both steps, the casing 1 and the shaft 6 are cooled by dry ice particles, and the casing 1 and the shaft 6 are made of body-centered cubic lattice such as carbon steel (atomic atoms at the center and apex of the cube). If the heat exchange medium is stopped during both steps, the sliding of the shaft 6 and the rotary joint 11 may occur. The main reason is that there is a risk that the sliding portion of the rotary joint 11 is damaged because the shaft 6 rotates in a state where the moving surface is dry.

If priority is given to suppressing the sublimation amount of the supplied dry ice particles, that is, the use amount of the dry ice particles, the worker can close the jacket 3, the shaft 6 and the rotating body when the opening 40 is closed. The supply of the heat exchange medium to 15 may be stopped. In that case, when the heat exchange medium remaining in the heat exchange medium circulation path 39, the shaft 6 and the rotating body 15 is cooled by dry ice and solidifies (becomes ice), the volume expansion causes the jacket 3 and In order to prevent the casing 1, the shaft 6 and the rotating body 15 from being deformed or damaged, it is desirable that the outlets of the heat exchange medium discharge pipes 5 and 14 be opened. Further, in order to prevent the sliding portion of the rotary joint 11 from being damaged, this operation (the operation of discharging the residue by stopping the supply of the heat exchange medium to the rotary joint 11 during the dry ice charging step) is performed. ) Is preferably performed in a short time.

Next, the operator operates the rotary valve 38 to put the dry ice particles in the dry ice particle buffer tank 32 into the fixed amount supply device 20 through the dry ice particle supply pipe 33, and the fixed amount supply device. 20 is activated (dry ice charging step). At this time, the operator confirms in advance that no powder remains in the quantitative supply device 20.

The dry ice particles charged into the fixed amount supply device 20 are supplied into the casing 1 from the supply port 18 through the powder distribution pipe 19.

The dry ice particles previously supplied into the casing 1 were provided as required by the pushing force by the dry ice particles introduced later, the pressure at the filling height at the supply port 18, and the like, as with the powder. Due to the inclination of the casing 1, the rotation of the shaft 6, etc., the thrust in the direction parallel to the shaft 6 (rear direction) is received, and the inside of the casing 1 gradually moves toward the weir plate 21.

The powder that has been widely dispersed and remained on the inner peripheral surface (bottom surface) of the casing 1 is pushed by the dry ice particles and gradually gathers on the side of the dam plate 21.

In addition, when the powder adheres to the surface of the casing 1, the shaft 6, and the rotating body 15, the adhered powder peels off from the respective surfaces due to the volume expansion during the sublimation of the dry ice particles in contact with the powder. And it moves to the weir plate 21 side with dry ice particles.

Subsequently, by supplying dry ice particles, the powder layer and the dry ice particle layer gradually increase.

At this time, the plug flow property (also referred to as piston flow property) of the powder is maintained due to the partitioning effect of the rotating body 15, and the mixing of the treated powder that has entered first and the dry ice particles that have entered later is as much as possible. It can be suppressed.

When the height of the powder layer exceeds the upper end of the dam plate 21, only the powder is first discharged from the upper end of the dam plate 21 to the discharge port 23.

When the dry ice particles are continuously charged, most of the powder that is pushed out by the dry ice particles and remains in the casing 1 is discharged.

The percentage of dry ice particles mixed in the powder discharged over time increases, then the ratio of powder to dry ice particles is reversed, and finally, most of them become dry ice particles.

In addition, even if dry ice particles are mixed in the discharged powder, the dry ice particles easily sublimate even at room temperature, so that only the treated powder can be recovered simply by leaving it as it is. Therefore, it is not necessary to provide a separate process for separating the powder and the dry ice particles.

Next, the operator stops the supply of dry ice particles to the quantitative supply device 20 or the operation of the quantitative supply device 20. If the supply of the heat exchange medium to the jacket 3, the shaft 6, and the rotating body 15 is stopped in the dry ice charging step, the supply of the heat exchange medium is resumed to promote sublimation of the dry ice particles. Is preferred.

The dry ice particles remaining in the casing 1 are sublimated and become carbon dioxide, and are discharged out of the system through the exhaust pipe 29 from the carrier gas discharge port 28 by the suction port 23 and the suction force of the exhaust blower 31. The

Finally, after confirming that the total amount of dry ice particles has been sublimated, the operator stops the supply of the heat exchange medium to the heat exchange medium circulation path 39 and the shaft 6 and also stops the rotation of the two shafts 6.

Thereafter, the operator turns the handle 37 to open the opening 40, so that carbon dioxide heavier than air can be effectively discharged from the casing 1 through the opening 40.
Similarly to the above, carbon dioxide can also be exhausted through the exhaust pipe 29.

In the present embodiment, the powder remaining in the casing 1 can be pushed out and discharged by dry ice particles.

The dry ice particles peel off the powder adhering to the surface of the casing 1, the shaft 6, and the rotating body 15 by volume expansion during sublimation, and then the dry ice particles are naturally discharged together with the powder from the casing 1. Therefore, the inside of the casing 1 can be cleaned together with the discharge of the residual powder in the casing 1.

混合 Since the dry ice particles and powder mixture are sublimated at room temperature, the residual powder can be handled as a product.

In this way, the powder in the casing 1 is controlled by controlling the opening / closing of the discharge plate 22 (opening control of the opening) and the on / off control of the exhaust blower 31 in the powder charging stop step and the dry ice charging step after the drying process. Dry ice particles remaining after body discharge, powder discharge, and carbon dioxide after sublimation can be effectively discharged from the casing 1.

The dry ice particles used in this embodiment preferably have an average particle diameter of 3 to 10 mm, more preferably a cylindrical shape having a cross-sectional diameter of 5 mm or less and a length of 20 mm or less.

In the case of powdered dry ice having an average particle diameter of less than 3 mm, the sublimation is too fast and the sublimated dry ice powder and the dry ice powder and the residual powder (treated powder) are solidified. When the 6 is rotated, a large load is applied. On the other hand, in the case of dry ice particles having an average particle diameter larger than 10 mm, the residual powder enters the gaps between the dry ice particles, and the residual powder cannot be pushed out first, resulting in poor dischargeability. Further, since the dry ice particles sandwiched between the inner peripheral surface of the casing 1 and the outermost peripheral surface of the rotating body 15 are crushed, the burden on the rotating body 15 is increased.

In the present embodiment, as an example of discharging the powder remaining in the interior with dry ice particles, an embodiment in which dry ice particles are introduced into a grooved stirring and drying device has been described. Another powder processing apparatus having a structure in which powder is extruded and discharged may be used. Examples of these powder processing apparatuses are, without limitation, an agitating type mixing granulator (Agitating mixer and granulator) and a screw type feeder (Screw feeder).

Further, in the present embodiment, the structure in which the heat exchange medium for heat exchange passes inside the jacket 3 and the like has been described, but the sublimation of the dry ice particles is possible without a heating mechanism.

In the present embodiment, the form using dry ice particles as the sublimable solid particles that are granular and sublimate (phase transition from solid to gas) at room temperature and normal pressure has been described. However, other particulate sublimable substances may be used. The form to be used may be used.

Next, an experiment using the residue discharge method shown in this embodiment will be described.

Specifically, an effective volume in the casing 1 of 47 liters, an effective heat transfer area of the jacket 3 of 0.5 m ² , an effective heat transfer area of the rotating body 15 of 1.0 m ^2, a grooved stirring and drying device (Nara Machinery Co., Ltd.) Manufacture, trade name: paddle dryer, model: NPD-1.6W-1 / 2L), treated powder: ABS resin (Acrylonitrile Butadiene Styrene Copolymerized Synthetic Resin) particles with an average particle size of 0.5 mm : 3 mm × length: 10 mm column-shaped dry ice particles were used for the discharge experiment.

First, water vapor as a heat exchange medium is supplied to the heat exchange medium circulation path 39, the shaft 6 and the rotating body 15, and then the shaft 6 is rotated at a rotation speed of 30 min ^{−1 so} that the temperature in the casing 1 becomes 120 ° C. I waited for you.

Thereafter, ABS resin particles were quantitatively supplied into the casing 1 to perform a drying process.
After the introduction of the ABS resin particles was completed, the drying process was performed for a while and then the opening 40 was opened. The ABS resin particles were naturally discharged for about 15 minutes until the ABS resin particles became about 30% of the volume in the casing 1. .

Thereafter, the opening 40 was closed, and dry ice particles were continuously charged at a supply rate of 90 kg / Hr so that the residence time in the casing 1 was 20 minutes, and the amount of ABS resin particles discharged every 2 minutes was measured. . The supply of dry ice particles was stopped and the dry ice particles were sublimated 30 minutes after the start of the introduction of the dry ice particles (1.5 times the residence time of the dry ice particles in the casing 1). Thereafter, the rotation of the shaft 6 was stopped, ABS resin particles remaining in the casing 1 were collected, and the amount thereof was measured.

As a result, the amount of ABS resin particles remaining in the casing 1 was an extremely small amount of 1% of the effective volume in the casing 1.

DESCRIPTION OF SYMBOLS 1

Casing

2a, 2b 1st support stand, 2nd support stand 3 Jacket 4 Heat exchange medium distribution pipe 5 Heat exchange medium discharge pipe 6 Shaft 7 Front bearing 8 Rear bearing 9 Gear 10

Sprocket

11a, 11b 1st rotary joint , Second rotary joint 12 heat exchange medium supply pipe 14 heat exchange medium discharge pipe 15 rotating body 16 scraping plate 17 cover 18 supply port 19 powder distribution pipe 20 quantitative supply device 21 weir plate (overflow gate)
22 Discharge plate (underflow gate)
23 Discharge port 24 Fastener 25 Discharge plate opening / closing shaft 26 Front carrier gas introduction port 27 Rear carrier gas introduction port 28 Carrier gas discharge port 29 Exhaust pipe 30 Powder separator 31 Exhaust blower 32 Dry ice particle buffer tank 33 Dry ice particle supply Tube 34 1st axis support (support)
35 Second shaft support (support)
36 Bearing 37 Handle 38 Rotary valve 39 Heat exchange medium circulation path 40 Notch (opening)

Claims

A powder having a casing, a supply port provided at an upper portion of one end portion of the casing, and a discharge port provided at a lower portion of the other end portion of the casing. A residue discharging method in a powder processing apparatus that is extruded and the powder in the casing moves toward the discharge port,
A powder charging stop step for stopping powder charging from the supply port after the powder processing ends;
A residue discharging method comprising: a sublimable solid particle charging step of charging sublimable solid particles that sublime at room temperature and normal pressure from the supply port after the powder charging stop step.
The powder processing apparatus has a dam plate for damming the powder moving toward the discharge port in the casing, and an opening for discharging the powder in the casing below the dam plate. And
The opening is closed during the powder processing;
The opening is opened after the powder charging stop step and until the sublimable solid particle charging step,
The residue discharge method according to claim 1, wherein the opening is closed during the sublimable solid particle charging step.
A shaft that is pivotally mounted on the casing and on which a plurality of rotating bodies are disposed;
The rotating body is hollow, a heat exchange medium passes therethrough, and functions as a heat exchanger that heats or cools the powder inside the casing,
2. The powder charging stop step and the sublimable solid particle charging step are performed in a state in which the heat exchange medium is continuously supplied to the rotating body via the shaft. Residue discharge method.
The residue discharging method according to claim 3, wherein the shaft is formed of a metal having a body-centered cubic lattice.
The residue discharging method according to claim 1, wherein the sublimable solid particles are dry ice particles.
A casing, a shaft pivotally mounted on the casing and provided with a plurality of rotating bodies, a supply port provided at an upper portion of one end portion of the casing, and a lower portion of the other end portion of the casing. A powder processing apparatus for processing the powder charged from the supply port in the casing and discharging the powder from the discharge port;
With sublimable solid particles that sublime at room temperature and normal pressure,
In the powder processing apparatus, the powder in the casing is moved toward the discharge port by the pushing force of the powder input from the supply port,
The residue discharge system of a powder processing apparatus, wherein the sublimable solid particles are charged from the charging port after the processing is completed.
The residue discharge system according to claim 6, wherein the sublimable solid particles are dry ice particles having an average particle diameter of 3 to 10 mm.
The residue discharge system according to claim 7, wherein the dry ice particles have a cylindrical shape having a cross-sectional diameter of 5 mm or less and a length of 20 mm or less.