JP2003033642A - Apparatus for supplying powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder supplying apparatus by which powder can be supplied to a granulating apparatus quantitatively without being affected by the pressure change in the granulating apparatus and outdoor air unnecessary to the granulating apparatus can be prevented from flowing in. SOLUTION: This powder supplying apparatus 1 is provided with a powder storing hopper 10, a supply pipe 18 which is arranged in the lower part of the hopper 10 and has a powder supplying port 20 to be opened to a granular substance treating apparatus being the granulating apparatus, a screw 17 arranged in the pipe 18 and a plug 19 which consists of a covering part 21 for opening or closing the port 20 and a plug shaft 22 and is arranged so that the plug 19 is moved freely between the port 20-closed position and the port 20-opened position to allow the powder to be supplied. The supply of the powder is controlled by opening or closing the part 21 and the supplied powder can be treated continuously in the granular substance treating apparatus without detaching the apparatus 1. A purge air supplying port 23 is arranged on the part 21 for jetting the compressed air so that the powder to be discharged from the port 20 is dispersed by the compressed air from the port 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder supply device for supplying powder as a raw material or a coating material to a powder or granular material processing device such as a granulation coating device.

[0002]

2. Description of the Related Art Conventionally, in a so-called powder coating granulation process in which a powder is supplied to core particles in a granulating device to obtain a granulated product, when powder is supplied, rotary powder feeding such as a screw feeder is performed. The powder supply device using the means is widely used. In such a rotary motion type powder feeder,
The powder is stored in a hopper, cut out by a screw feeder arranged in the lower part of the hopper, and is appropriately supplied to a powdery or granular material processing apparatus according to a processing step.

[0003]

However, in such a conventional powder feeding device, the powder feeding port provided at the end of the screw feeder faces the inside of the granulating device and is open at all times. Since it is installed in
There were the following problems. First of all, since the powder supply port is always open in the granulating apparatus, there is a problem in that the powder supply amount is likely to fluctuate under the influence of pressure fluctuations in the apparatus and the quantitativeness cannot be maintained. It was For example, in a fluidized bed granulator, the inside of the apparatus is in a negative pressure state and it constantly fluctuates. Therefore, when the powder supply device is attached to the fluidized bed granulation device, the supply amount changes depending on the magnitude of the negative pressure, which causes a problem that the powder cannot be stably supplied.

Secondly, in the case where the inside of the fluidized bed apparatus has a negative pressure as in the above-mentioned fluidized bed apparatus, even if an attempt is made to stop the powder supply during the granulation process, the powder is drawn in by the negative pressure, There was a problem that the supply amount was inaccurate. In this case, if only the necessary amount for one batch is stored in the hopper, no further powder supply is performed and the supply amount is not inaccurate. However, if all of the powder in the hopper or screw feeder is supplied, it becomes a cavity communicating with the inside of the device, and this causes a problem that outside air flows in from there. The inside of the granulating device is required to be closed from the viewpoint of preventing cross contamination, and such inflow of outside air is not preferable in terms of product quality.

For this reason, as a countermeasure, it is possible to put more powder than necessary into the hopper and seal the outside air inflow path with residual powder to prevent contamination. However, in the case of a powder having good fluidity, it is sucked into the apparatus one after another even though the screw feeder is stopped as described above, and in that case, the quantitativeness of powder supply cannot be secured. In addition, the negative pressure in the device may cause the powder in the hopper to be completely sucked, and eventually the inflow of outside air may not be prevented.

Therefore, in the conventional powder coating granulation process, the powder supply device is attached to and detached from the granulation device at the time of switching between the powder supply process and the drying process in order to maintain a fixed amount of supply and a closed system. Here, as an example of the granulation process, first, the raw material is put into the granulating apparatus, and then warmed up until the raw material reaches a predetermined temperature (for example, 40 ° C.). At this time, the hole of the powder supply device mounting portion is closed by a lid for sealing it. Next, after stopping the granulating device, the lid is removed and the powder supplying device is set in the granulating device. Then, spraying or the like is performed while supplying the powder to perform the powder coating granulation process.
After that, when a predetermined amount of powder is supplied, the apparatus is temporarily stopped, the powder supply apparatus is removed, and the mounting hole is sealed with a lid.
Furthermore, if necessary, protective coating or the like is performed, and the granulation processing step is completed.

However, in this process, it is necessary to remove the powder supply device during the processing, and thus it is always necessary to manually perform the work. In other words, in connection with the second problem, human work is indispensable in the conventional powder coating granulation process, and unmanned processing and automation cannot be performed. For this reason, there has been a problem that the number of manufacturing steps is increased, which hinders cost reduction.

Further, as a third problem, in the powder feeder using the screw feeder, the powder agglomerated by the screw becomes an agglomerate and drops into the granulator, which is not dispersed and agglomerate is generated. There was also a problem that caused. For example, in the case of a highly cohesive substance such as corn starch, the effect is large, and the aggregates of the powder that are aggregated are ejected from the powder supply port, and the aggregates are not loosened in the granulator and the aggregates are formed. There was a problem of forming.

The object of the present invention is to supply a fixed amount of powder without being affected by the pressure change in the granulating apparatus, and to start and stop the powder supply at an arbitrary timing.
Moreover, it is an object of the present invention to provide a powder supply device capable of preventing unnecessary inflow of outside air into the granulating device.

[0010]

The powder supply device of the present invention comprises a container for storing powder and a powder supply port which is attached to the lower part of the container and which is opened in the device for receiving powder supply. What is claimed is: 1. A powder supply device comprising: a powder supply pipe; and a screw member arranged in the powder supply pipe for supplying the powder in the container to the powder supply port. It is characterized in that a lid that can open and close the powder supply port is provided at the end of the body feeding pipe.

According to the present invention, since the powder supply to the powder / grain processing apparatus can be controlled by opening / closing the lid, the powder processing steps such as mixing-powder coating granulation-drying can be performed without removing the apparatus. Can be performed continuously. For this reason,
It becomes possible to eliminate the manual work, to make the processing unmanned and to automate it, and to reduce the manufacturing cost. Also,
Since the powder supply device is not removed, it is possible to prevent outside air and dust from flowing into the powder / grain processing device as the device is removed.

Further, even if the internal pressure of the apparatus fluctuates during the powder supply, it is less affected by the action of the lid, so that the quantitativeness of the powder supply can be ensured, and after the powder supply is completed, the excess powder is processed into the granular material. Since it is not drawn into the device, the required amount of powder can be accurately supplied, and the product quality can be improved. In addition, the external air flowing into the powdery or granular material processing apparatus before or after the powder supply is also shut off.

Further, in the powder supply device, the lid body is disposed so as to be drivable along the axial direction of the powder supply pipe, and the powder supply port is closed to close the powder supply port. ,
The powder supply port may be opened so as to be movable between a powder supply permission position where the powder supply is permitted. In this case, the lid may be provided so that the distance from the powder supply port closed position to the powder supply allowable position can be set arbitrarily. It is also possible to provide the lid so as to be able to stop at any position between the powder supply port closed position and the powder supply allowable position. Further, the lid body may be provided with a drive shaft which is disposed in the screw member so as to be movable along the axial direction.

On the other hand, in the powder supply device, a purge air supply port for supplying compressed air to the powder may be provided in the lid. As a result, the powder discharged from the powder supply port receives the compressed air jetted from the purge air supply port and is dispersed, so that it is possible to prevent the powder from becoming a nodule and dropping into the granulating device. Also, with purge air,
The powder adhering to the lid and the powder supply port can be blown off, and the powder can be prevented from being caught when the lid is closed.

In this case, the purge air supply port is formed on the side surface of the lid body, and a hollow drive shaft mounted on the lid body and movably disposed in the screw member along the axial direction is formed therein. Compressed air may be supplied through the compressed air.
Thus, the purge air can be jetted from the lid without installing a special pipe.

Further, the device that receives the powder supply from the powder supply device may be a powder or granular material processing device in which the internal pressure of the device is substantially a negative pressure. In the powder feeding device, even if the internal pressure of the device becomes negative, the quantitative effect of the powder feeding can be ensured by the action of the lid, and the excess powder is not drawn into the powder / grain processing device even after the powder feeding is completed. . It is also possible to prevent outside air from flowing into the powdery or granular material processing apparatus before or after the powder is supplied.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a perspective view showing the outer appearance of a powder supply device according to an embodiment of the present invention, and FIG.
It is explanatory drawing which shows the state which attached the powder supply apparatus of this to the centrifugal tumbling granulation coating apparatus. Here, first,
After explaining the outline of the device based on FIG. 2, the internal configuration and operation of the device will be described based on the drawings after FIG.

The powder feeding apparatus 1 of FIG. 1 comprises a device main body 3 in which a motor, a control circuit and the like are contained in a stainless steel casing 2,
The powder supply unit 4 is detachably attached to the apparatus main body 3 and can be replaced appropriately according to the powder supply amount.
Further, as shown in FIG. 2, the powder supply device 1 is directly attached to, for example, a centrifugal tumbling granulation coating device (hereinafter abbreviated as GX device) 5, and the powder is supplied to a processing container 6 of the GX device 5. It is designed to supply. The powder supply device 1 is connected to the GX device 5 while being placed on the installation table 7, and the powder supply device 1 is installed on the installation table 7 horizontally at the bottom of the housing 2. The adjuster pad 8 is attached.

The GX device 5 is a powdery or granular material processing device capable of performing the processes from granulation to drying by one unit based on the operation on the control panel 9, like the device of Japanese Patent Laid-Open No. 2001-54729. is there. The powder supply device 1 is capable of quantitatively supplying powder to the GX device 5 at an arbitrary timing without removing the device, as described later. Further, by using the powder supply device 1, it is possible to continuously carry out the processing such as powder coating granulation without disturbing the granulation process in the GX device 5.

On the other hand, as shown in FIG. 1, the powder supply unit 4 of the powder supply device 1 is provided with a hopper 10 made of stainless steel as a container for storing powder. Hopper 10
The container is a U-shaped container having an open upper portion and a curved lower portion, and a flange portion 11 is formed around the container. The flange portion 11 is provided with a screw insertion hole (not shown), through which a mounting screw 12 provided on the device body 3 side is inserted, and a wing nut 13 is tightened to be fixed to the device body 3. In this case, the powder supply unit 4 is appropriately exchanged depending on the powder supply amount, but in the powder supply apparatus 1, the powder supply unit 4 can be easily disassembled by the wing nut 13.
It can be fixed. Further, inside the hopper 10, a scraper 14 for stirring powder is provided.

A screw holder 15 made of stainless steel is attached to the lower part of the hopper 10. The screw holder 15 is a cylindrical supply pipe (powder supply pipe) 1 that accommodates a flange portion 16 and a screw (screw member) 17.
8 and. Similar to the flange portion 11, the flange portion 16 is also provided with a screw insertion hole (not shown). Then, the screw holder 15 is fixed to the side surface of the hopper 10 by inserting the mounting screw 12 provided on the hopper 10 side therethrough and tightening the wing nut 13. The screw holder 15 can be attached and detached with the wing nut 1
3, the parts can be easily washed.

Inside the screw holder 15, a plug (cover) 19 is arranged coaxially with the screw 17. The plug 19 is composed of a lid portion 21 that fits into the powder supply port 20 that is opened at the end of the supply pipe 18, and a plug shaft (drive shaft) 22 that is fixed to the lid portion 21 and extends into the supply pipe 18. To be done. The plug 19 is provided so as to be movable in the axial direction and closes the powder supply port 20.
As described above, it can freely move between the position where it projects from the powder supply port 20 and allows the powder supply. A purge air supply port 23 that supplies compressed air is provided on the side surface of the lid portion 21.

On the other hand, an operation panel 24 is provided on the front surface of the apparatus main body 3. Various switches 25, a purge air pressure adjusting valve 26, various indicators 27, a purge air pressure gauge 28, an indicator controller 29, etc. are installed on the operation panel 24. In the powder supplying apparatus 1, the switch 25 is a main power switch 25 for turning on / off the powder supplying apparatus 1.
a, scraper ON / OFF switch 25b, screw ON / O
An FF switch 25c, a plug opening / closing switch 25d, and a purge air ON / OFF switch 25e are provided. Further, as the indicator light 27 showing the operation state of each part, a main power indicator light 27a, a scraper indicator light 27b, a screw indicator light 2
7c is provided. Further, as the instruction controller 29, a scraper rotation speed instruction controller 29a and a screw rotation speed instruction controller 29b are provided.

Next, the internal structure of the powder feeder 1 will be described. 3 and 4 are explanatory views showing the internal configuration of the powder supply apparatus of FIG. 1, FIG. 3 is a view of the apparatus from the back side in FIG. 1, and FIG. 4 is a view of the apparatus from the top side in FIG. 4 shows the configuration (corresponding to the plan view of FIG. 3). Figure 3
As shown in FIG. 3, inside the housing 2, a motor 31 for driving the scraper 14 and a motor 32 for driving the screw 17 are provided.
Is housed. Each of the motors 31 and 32 is fixed to a motor bracket 33 arranged inside the housing 2.

The rotating shaft 34 of the motor 31 is connected to a scraper drive shaft 37 composed of a coupling portion 35 and a scraper mounting portion 36. One end side of the coupling portion 35 is open, and the rotary shaft 34 is inserted therein. A key groove 38 is formed on the rotating shaft 34.
The rotary shaft 34 and the scraper drive shaft 37 are fixed by screwing a set screw (not shown) into the screw 8 through the screw hole 39. The scraper drive shaft 37 is supported by a bearing 40 mounted on the housing 2, and the scraper mounting portion 36 projects from the housing 2.

Here, the scraper 14 has a cylindrical base portion 4.
1 has a configuration in which mountain-shaped and square-shaped stirring blades 42 are provided above and below, and a pin 43 is attached to a base portion 41 so as to penetrate in a diameter direction. On the other hand, a pin groove 44 is formed in the scraper mounting portion 36 along the axial direction. Then, by inserting the pin 43 into the pin groove 44 and externally inserting the pin 43 into the scraper attaching portion 36, the scraper 14 is attached to the scraper drive shaft 37 while being prevented from rotating. When the hopper 10 is attached to the housing 2, the transparent resin plate 45 (for example, made of acrylic) for the viewing window attached to the hopper 10 prevents the scraper 14 from coming off in the axial direction.

A drive gear 47 is attached to the rotary shaft 46 of the motor 32.
Is attached. The drive gear 47 meshes with a driven gear 49 formed on the screw drive shaft 48.
The screw drive shaft 48 includes the housing 2 and the motor bracket 3.
It is supported by a bearing 50 attached to the No. 3, and a through hole 51 is formed in the central portion along the axial direction. A female screw portion 52 is provided on one end side (the left end side in FIG. 3) of the through hole 51.

On the other hand, one end of the screw 17 (see FIG.
A male screw portion 53 is provided on the right end side in FIG. FIG. 5 is an explanatory diagram showing the configuration of the screw 17.
The screw 17 is made of stainless steel, and as shown in FIG. 5, has a configuration in which a hollow shaft portion 54 is provided with a spiral rotary blade 55 (diameter of about 30 mm) in a protruding manner. A male screw portion 53 is formed at the right end in the figure, and the screw 17 is fixed to the screw drive shaft 48 by screwing the male screw portion 53 into the female screw portion 52. The screw 17 fixed to the screw drive shaft 48 penetrates the bottom of the hopper 10 and is rotatably accommodated in the supply pipe 18 of the screw holder 15 as shown in FIG.

A plug 19 is inserted into the shaft portion 54 of the screw 17, as shown in FIG. In this case, a dry metal 56 is attached to the end of the screw 17, and the plug 19 is supported by the dry metal 56 on the left end side so as to be slidable in the axial direction. Figure 6 shows plug 1
9 is an explanatory view showing the structure of FIG. 9, and FIG. 7 is a perspective view showing the structure in the vicinity of the powder supply port 20. The plug 19 is also made of stainless steel, and as shown in FIG. 6, a hollow pipe (outer diameter 6 mm.
The disk-shaped lid 21 is attached to the plug shaft 22 composed of an inner diameter of 4 mm).
It has a structure in which is fixed by welding. The side surface of the lid portion 21 is a tapered surface 57, and is fitted with a tapered surface 58 formed at the powder supply port 20 at the end of the supply pipe 18. Then, when the tapered surfaces 57 and 58 are fitted in contact with each other, the powder supply port 20 is closed by the lid portion 21, and the powder supply from the powder supply port 20 is cut off.

On the tapered surface 57, four purge air supply ports 23 are equally formed. An air supply passage 59 extends from the center of the lid portion 21 to the purge air supply port 23, and the air supply passage 59 opens into a through hole 60 in the center of the lid portion 21 as shown in FIG. 6. . The through hole 60 communicates with the hollow portion 61 of the plug shaft 22, and the hollow portion 61, the through hole 60, and the air supply passage 59 form a purge air supply passage, and the lid portion 21 does not require any special pipes. It is possible to eject the purge air from here. A plate 62 for closing the through hole 60 is welded and fixed to the side surface of the through hole 60 opposite to the side where the plug shaft 22 is fixed.

The plug shaft 22 penetrates the screw 17 and the screw drive shaft 48, and the right end thereof extends to the right of the screw drive shaft 48. As shown in FIG. 3, the right end portion of the plug shaft 22 is inserted into a synthetic resin plug bracket 64, and set collars 65 are provided on both sides thereof.
Is provided. A set bolt (not shown) is attached to the set collar 65, and it is fixed on the plug shaft 22 by tightening the set bolt. A communication hole 66 is provided on the right end side of the plug shaft 22 in the drawing, and communicates with an air supply port 67 in the plug bracket 64. Compressed air is supplied to the air supply port 67 via an air pipe 68 from a compressor (not shown) outside the apparatus. As a result, compressed air is supplied to the purge air supply port 23, and the purge air is jetted from the side of the lid 21. The right end of the plug shaft 22 is closed by an end cap 63.

The plug bracket 64 is used for the air cylinder 6
9 is connected to the piston rod 70. The air cylinder 69 is also driven by compressed air supplied from a compressor outside the device. When the piston rod 70 is projected to the left in FIG. 3, the plug bracket 64 moves and the plug 19 is driven. That is, the movement of the plug bracket 64 on the plug shaft 22 is restricted by the set collar 65, and the plug shaft 22 also moves to the left as the plug bracket 64 moves. As a result, the lid 21 moves to the left and separates from the powder supply port 20, and the powder supply port 20 is opened. A stroke adjusting portion 71 is provided on the other end side of the piston rod 70, and the amount of protrusion of the piston rod 70 can be changed by adjusting the position of the nut 72.

On the other hand, in the powder supplying apparatus 1, the powder supplying section 4 is exchanged as follows. Since the removal order is the reverse of the attachment order, only the attachment method of the powder supply unit 4 will be described. Here, first, the screw 17 is attached to the apparatus main body 3. That is, the screw 17 is inserted into the apparatus main body 3 and rotated in the clockwise direction,
3 is screwed into the female screw portion 52 of the screw drive shaft 48 to be fixed. Next, the scraper 14 is attached to the scraper drive shaft 3
Attach to 7. In this case, the pin 43 is aligned with the pin groove 44 while rotating the scraper 14, and the both are connected.

After that, the hopper 10 is attached to the apparatus main body 3 and fixed by the wing nut 13. After mounting the hopper 10, the plug 19 is inserted from the tip of the screw 17. At this time, a side door (not shown) on the back side of the apparatus main body 3 in FIG. 1 is opened, and two set collars 65 are inserted into the plug shaft 22 so as to sandwich the plug bracket 64, and tightening bolts are tightened. At this time, the opening of the plug 19, that is, the distance between the powder supply port 20 and the lid 21 is appropriately set according to the type of powder and the processing conditions, and then the set collar 65 is fixed.

By the way, in such a powder supply apparatus 1, the motors 31, 32, the air cylinder 69, etc. are controlled and driven by a control unit (not shown) arranged behind the operation panel 24. FIG. 8 shows the powder supply device 1
3 is an explanatory diagram showing the configurations of a motor control system and a pneumatic control system in FIG. Here, the motor control system 73 includes a circuit protector 75 (CP1) having a main power switch 25a.
AC 100V is supplied via the. The main power supply indicator light 27a is provided at the rear stage of the circuit protector 75,
When the main power switch 25a is turned on, it lights up.

In the subsequent stage of the circuit protector 75, circuit protectors 76a (CP2) and 76b are further provided.
Motor drivers 77a and 77b are provided through (CP3). Circuit protectors 76a, 76b
Each of them has a scraper ON / OFF switch 25b and a screw ON / OFF switch 25c. Also,
A scraper indicator light 27b and a screw indicator light 27c are provided in parallel with the motor drivers 77a and 77b. The motor drivers 77a and 77b themselves are driven by DC 24V from the power supply 78.

When the scraper ON / OFF switch 25b is turned on with the main power switch 25a turned on, the scraper indicator lamp 27b is turned on and the motor driver 77a drives the motor 31. At this time, the rotation speed of the motor 31 is the predetermined rotation speed (for example, 0 to 70) set by the scraper rotation speed instruction controller 29a.
It is controlled by the motor driver 77a so that the speed becomes (rpm). When the screw ON / OFF switch 25c is turned on with the main power switch 25a turned on,
The screw indicator light 27c is turned on, and the motor 32 is driven by the motor driver 77b. On this occasion,
The rotation speed of the motor 32 is the screw rotation speed indicating controller 2
Predetermined rotation speed set in 9b (for example, 0 to 136rp
m) is controlled by the motor driver 77b.

On the other hand, in the pneumatic control system 74, to the air cylinder 69 via the 5-way air valve (MAV1) 79,
Main air (compressed air) is supplied to the purge air supply port 23 through the two-way air valve (MAV2) 80. In this case, solenoid valves are used for both air valves 79 and 80, and they operate in conjunction with the plug opening / closing switch 25d and the purge air ON / OFF switch 25e. It should be noted that these switches 25d and 25e function only when the main power switch 25a is ON.

Speed controllers 81a and 81b (SP1 and SP2) are provided downstream of the five-way air valve 79, through which compressed air is supplied to the air cylinder 69. Further, a purge air pressure adjusting valve (NV1) 26 using a needle valve is arranged at the subsequent stage of the two-way air valve 80, through which compressed air is supplied to the air supply port 67 of the plug bracket 64. .
A purge air pressure gauge 28 (PG1) is provided between the valve 26 and the air supply port 67.

When the plug opening / closing switch 25d is turned on with the main power switch 25a turned on, 5
The one-way air valve 79 operates to shift to the left from the state of FIG. 8, and compressed air is supplied to the air cylinder 69 via the speed controller 81a. As a result, the piston rod 70 projects, the plug 19 separates from the powder supply port 20, and the powder supply port 20 is opened.
On the other hand, when the plug open / close switch 25d is turned off, 5
The one-way air valve 79 is in the state shown in FIG. 8, and compressed air is supplied to the air cylinder 69 via the speed controller 81b. As a result, the piston rod 70 retracts, the plug 19 fits into the powder supply port 20, and the powder supply port 20 is closed.

Further, when the purge air ON / OFF switch 25e is turned on with the main power switch 25a turned on, the two-way air valve 80 is operated to the communication side, and the purge air pressure adjusting valve 26 is used to operate the air cylinder. Compressed air is supplied to 69. At this time, the supply amount of purge air is
It is appropriately controlled by adjusting the opening degree of the valve 26.

Next, a powder coating granulation process using such a powder supply device 1 will be described. FIG. 9 is an explanatory view showing the operation of the plug 19 during the powder coating granulation process. FIG. 9A shows the plug closed state (the state where the lid 21 is at the powder supply port closed position C), and FIG. Shows the plug open state (the state where the lid portion 21 is at the powder supply allowable position O).

First, in the system of FIG. 2, the raw material is put into the GX device 5 and warmed up until the raw material reaches a predetermined temperature. At this time, while the main power switch 25a of the powder supply device 1 is turned on, the plug opening / closing switch 25d
Is turned off. As a result, the powder supply port 20 opened in the processing container 6 is closed as shown in FIG. 9A, and the powder in the hopper 10 is not supplied into the GX device 5. Also, the inflow of outside air is blocked. Therefore, it is possible to maintain the closed system while stopping the powder supply without removing the powder supply device 1. At this time, turn on the scraper ON / OFF switch 25b,
It is desirable to stir the powder in the hopper 10.

After warming up, the plug open / close switch 25d is turned on to open the powder supply port 20 as shown in FIG. 9 (b). Also, screw ON with this
The / OFF switch 25c is turned on to supply the powder to the GX device 5. At this time, in the case of supplying powder having high cohesiveness, the purge air ON / OFF switch 25e is turned on to eject the purge air from the purge air supply port 23. As a result, even if the powder has a high cohesive property, the compressed air jetted from the purge air supply port 23 is received and dispersed in the vicinity of the powder supply port 20. Therefore, it is possible to prevent the agglomerated powder from becoming an agglomerate and dropping into the granulating device, and it is possible to suppress the agglomeration. At that time, in the apparatus, the purge air pressure adjusting valve 26 can appropriately adjust the supply amount of the purge air according to the type of powder to be supplied. Therefore, the optimum purge air can be supplied according to the properties of the powder, and the product quality can be made more stable.

On the other hand, while supplying powder to the GX device 5, G
When the pressure in the X device 5 fluctuates, the conventional powder feeding device cannot maintain the quantitativeness of the powder feeding due to its influence. On the other hand, in the powder supply device 1, the powder is supplied in the state where the lid 21 is arranged in front of the powder supply port 20, so that the lid 21 acts as a protective wall when discharging the powder, and the powder is discharged. The quantity is stabilized. That is, since the front surface of the powder supply port 20 is covered with the lid portion 21, the powder supply port 20 is hardly affected by fluctuations in the internal pressure, and the powder is not sucked out or pushed back excessively, and the powder supply is quantitative. Can be secured. Further, in this case, the opening degree of the plug 19, that is, the distance L in FIG. 9, can be appropriately changed depending on the mounting positions of the plug bracket 64 and the set collar 65 on the plug shaft 22 as described above. The optimum plug opening can be set according to

In this way, the powder coating and granulating process is performed by spraying while supplying the powder, and when a predetermined amount of the powder is supplied, the plug open / close switch 25d is turned off to close the powder supply port 20. . This allows the hopper 1
The powder in 0 is not supplied to the GX device 5 and the powder supply port 20 is closed even if the GX device 5 has a negative pressure.
It is also not drawn into the device 5. Therefore, it is possible to accurately supply the desired amount of powder necessary for the granulation process and improve the product quality. In addition, the inflow of outside air is blocked, and the closed system can be maintained even after the powder supply is completed without removing the powder supply device 1.

When the plug 19 is closed, the purge air ON / OFF switch 25e is turned on and the purge air is jetted from the purge air supply port 23. As a result, the lid 2
1 or powder adhering to the powder supply port 20, especially both tapered surfaces 5
The powder adhering to 7,58 is blown off by compressed air. Therefore, when the plug 19 is closed and the lid portion 21 is fitted into the powder supply port 20, it is possible to prevent the powder from being caught at the contact surface between the two and to ensure the hermeticity at the powder supply port 20. it can.

The series of operations can be automatically performed by programming. In that case,
A control CPU may be incorporated in the built-in controller, and an operation setting unit may be provided on the operation panel 24 to set the operation there. In addition, the control panel 9 of the GX device 5 and the controller are connected, and the entire system is integrated into a single system.
The powder supply device 1 may be generally controlled by the X device 5 side.

As described above, according to the powder supply apparatus 1, the steps of mixing-powder coating granulation-coating-drying and the like can be continuously performed without removing the apparatus, and the manual operation is performed. It becomes possible to omit the process and automate the process. That is, the human work which is indispensable in the conventional powder coating granulation process is not required, and for example, it becomes possible to perform an unmanned operation at night and to reduce the manufacturing cost. Also,
Since the powder supply device 1 is not removed, outside air and dust do not flow into the GX device 5 when the device is removed, so that product quality can be improved.

Further, even if the internal pressure of the apparatus fluctuates during the powder supply, it is less affected by the action of the lid portion 21.
It is possible to secure the quantitativeness of the powder supply, and since the excess powder is not drawn into the GX device 5 after the powder supply is completed, the required amount of powder can be accurately supplied and the product quality can be improved. Becomes Furthermore, the external air flowing into the GX device 5 before and after the powder supply is also shut off, and the granulation process can be performed while maintaining the closed system.

In addition, even if the powder has a high cohesiveness, it is dispersed in the vicinity of the powder supply port 20 by receiving the compressed air ejected from the purge air supply port 23, so that the agglomerated powder forms a nodule. It can be prevented from falling into the grain device. Also,
By the purge air, the powder adhering to the lid portion 21 and the powder supply port 20 can be blown away, the powder can be prevented from being caught when the plug 19 is closed, and the sealing property of the powder supply port 20 can be improved.

[0052]

EXAMPLES Next, the results of experiments in which powder coating granulation was performed using such a powder supply device 1 will be described. In this experiment, the powder supply device 1 was attached to a centrifugal tumbling granulation coating device GX-20 manufactured by Freund Sangyo Co., Ltd., and powder coating granulation was performed. The powder supply method is a nodule dropping supply method in which the powder is dropped from the upper part of the rolling particle layer, and a dispersion of supplying powder from the upper part of the rolling particle layer while ejecting purge air from the purge air supply port 23 at the powder supply port 20. Two conditions of supply system were implemented.

The experimental formulation is as follows. Nuclear particles: Freund Industrial Co., Ltd. non-pareil NP-101 32
/ 42 800 g, powder: lactose (DMV350M) 8
00g (before use, sieved at 22M), spray liquid: 5%
HPC-L aqueous solution. The operating conditions are as follows. Spray gun: ATU-mini 1 piece Air pressure 0.1
MPa Air volume 16 L / min, rotor speed 300 →
400 → 500 rpm, slit air: 200 → 250
L / min 30 ° C, powder supply amount: 25 g / min
(Air pressure in dispersion supply system 0.1 MPa), static pressure in layer: -0.2 to -0.4 kPa, dry flow air / slit air: 500 L / min 70 ° C Product temperature 40
Finished at ° C.

Table 1 is a table showing the product recovery amount and the particle size distribution measurement result in the experiment conducted under the above conditions.
As can be seen from Table 1, in any of the methods, a high rate of product yield of about 95% was obtained. The particle size distribution was also sharp, confirming high practicality.

[0055]

[Table 1]

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the plug opening is set only in two cases of fully open and fully closed, but an intermediate stop position such as half open may be set stepwise. Alternatively, the stroke of the piston rod 70 may be detected using a position sensor, and the opening degree of the plug 19 may be set to an arbitrary value on the operation panel 24 from 0% to 100%.

Further, the plug opening may be appropriately controlled according to the physical properties of particles during the granulation process. For example, feedback control based on physical properties of granulation is possible, such as measuring the weight ratio and surface area ratio of the granulation product and increasing the plug opening so that the powder supply amount increases as the surface area increases. Is. In this case, the plug opening may be changed linearly or may be changed stepwise,
It is also possible to control it together with the screw rotation speed. It is also possible to perform feedback control so as to supply a fixed amount according to the change in the internal pressure of the device.

In addition, in the above-described embodiment, an example in which the screw member is provided with a spiral rotary blade projecting on the shaft is shown, but, for example, a coil spring without a shaft is spirally wound. It is also possible to use a screw member or the like. It is also possible to use the screw 17 and the plug 19 in a cantilevered manner. Needless to say, the various dimensions described above or in the drawings are merely examples, and the present invention is not limited to these dimensions.

[0059]

According to the powder supply device of the present invention, the powder supply port can be opened and closed at the end of the powder feed pipe provided with the powder supply port opening in the powder and granular material processing device. Since the lid is provided, it is possible to control the powder supply to the powder / grain processing apparatus by opening / closing the lid. Therefore, it becomes possible to continuously perform the powder processing steps such as mixing-powder coating granulation-drying without removing the device. For this reason, it is possible to omit manual work in powder coating granulation and the like, to perform unmanned processing and to automate the processing, and to reduce the manufacturing cost. Also,
Since the powder supply device is not removed during the processing, it is possible to prevent the outside air and dust from flowing into the powder and granular material processing device when the device is removed, and it is possible to improve the product quality. Become.

Further, even if the internal pressure of the apparatus fluctuates during the powder supply, it is less affected by the action of the lid, so that it is possible to ensure the quantitativeness of the powder supply, and the excess powder is processed into the granular material after the powder supply is completed. Since it is not drawn into the device, the required amount of powder can be accurately supplied, and the product quality can be improved. In addition, the outside air that flows into the powdery or granular material processing device is also shut off before or after the powder supply,
Granules can be processed while maintaining the closed system.

Further, by providing the lid with the purge air supply port, compressed air can be blown from the purge air supply port to the powder discharged from the powder supply port to disperse the powder in the vicinity of the powder supply port. Becomes Therefore, even if the powder has a high cohesive property, it is possible to prevent the powder from becoming a nodule and falling into the granulating device, and it is possible to suppress the generation of nodules. Further, the purge air (compressed air) can blow off the powder adhering to the lid and the powder supply port, prevent the powder from being caught when the lid is closed, and improve the sealing property of the powder supply port. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a powder supply device according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which the powder supply device of FIG. 1 is attached to a centrifugal tumbling granulation coating device.

3 is an explanatory diagram showing an internal configuration of the powder supply device of FIG. 1, showing a case where the device is viewed from the back side in FIG.

FIG. 4 is an explanatory diagram showing an internal configuration of the powder supply apparatus of FIG. 1, showing the configuration when viewed from the upper surface side in FIG.

5 is an explanatory diagram showing a configuration of a screw used in the powder supply device of FIG. 1. FIG.

FIG. 6 is an explanatory diagram showing a configuration of a plug used in the powder supply apparatus of FIG.

FIG. 7 is a perspective view showing a configuration near a powder supply port.

8 is an explanatory diagram showing a configuration of a motor control system and a pneumatic control system in the powder supply apparatus of FIG.

FIG. 9 is an explanatory view showing the operation of the plug during the powder coating granulation process, where (a) shows the plug closed state and (b) shows the plug closed state.
Indicates the plug open state.

[Explanation of symbols]

1 Powder feeder 2 housing 3 device body 4 Powder supply section 5 Centrifugal rolling granulator (device that receives powder supply) 6 processing vessels 7 installation stand 8 Adjuster pad 9 control panel 10 hoppers (containers for storing powder) 11 Flange 12 mounting screws 13 Wing nut 14 Screw holder 15 scrapers 16 Flange 17 screw (screw member) 18 Supply pipe (powder supply pipe) 19 plug (lid) 20 Powder supply port 21 Lid 22 Plug shaft (drive shaft) 23 Purge air supply port 24 Operation panel 25 switch 25a Main power switch 25b scraper ON / OFF switch 25c screw ON / OFF switch 25d plug open / close switch 25e Purge air ON / OFF switch 26 Purge air pressure adjustment valve 27 indicator light 27a Main power indicator 27b scraper indicator light 27c screw indicator light 28 Purge air pressure gauge 29 Indicator controller 29a Scraper rotation speed instruction controller 29b Screw rotation speed indicating controller 31 motor 32 motor 33 Motor bracket 34 rotation axis 35 Coupling part 36 scraper mounting part 37 scraper drive shaft 38 keyway 39 screw holes 40 bearing 41 base 42 Stirrer 43 pin 44 pin groove 45 Transparent resin plate 46 rotation axis 47 drive gear 48 screw drive shaft 49 Driven gear 50 bearings 51 through hole 52 Female thread 53 Male thread 54 Shaft 55 rotating blades 56 dry metal 57 Tapered surface 58 Tapered surface 59 Air supply passage 60 through holes 61 Hollow part 62 plates 63 End cap 64 plug bracket 65 set colors 66 communication hole 67 Air supply port 68 Air piping 69 Air cylinder 70 Piston rod 71 Stroke adjustment section 72 nuts 73 Motor control system 74 Pneumatic control system 75 Circuit protector 76a, 76b Circuit protector 77a, 77b Motor driver 78 Power 79 5-way air valve 80 2-way air valve 81a, 81b Speed controller C Powder supply port closed position O Powder supply allowable position L plug opening

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigemi Isobe             2-14-2 Takadanobaba, Shinjuku-ku, Tokyo             Within Reint Sangyo Co. F-term (reference) 4F042 CB05 CB11 CB19 EC08                 4G068 AA02 AB22 AC11 AD33 AF01

Claims (8)

[Claims] 1. A container for storing powder, a powder feed pipe provided with a powder feed port which is attached to a lower part of the container and opens in a device for receiving powder feed, and the inside of the powder feed pipe. And a screw member for feeding the powder in the container to the powder supply port, the powder feeding device being provided at an end of the powder feeding pipe. A powder supply device characterized by having a lid capable of opening and closing a mouth. 2. The powder supply device according to claim 1,
The lid body is driven along the axial direction of the powder feed pipe, and a powder supply port closing position for closing the powder supply port,
A powder supply apparatus, which is movably arranged between a powder supply allowing position where the powder supply port is opened and the powder is allowed to be supplied. 3. The powder supply device according to claim 2,
The powder supply device, wherein the lid is provided so that a distance from the powder supply port closed position to the powder supply allowable position can be arbitrarily set. 4. The powder supply apparatus according to claim 2,
The powder supply device, wherein the lid is provided so as to be stopped at an arbitrary position between the powder supply port closed position and the powder supply allowable position. 5. The powder supply device according to claim 1, wherein the lid has a drive shaft that is movably arranged in the screw member along an axial direction. A powder supply device characterized by the above. 6. The powder supply device according to claim 1, wherein the lid has a purge air supply port for supplying compressed air to the powder. Body feeding device. 7. The powder supply device according to claim 6,
The purge air supply port is opened on the side surface of the lid body, and compressed air is supplied through a hollow drive shaft that is attached to the lid body and is movably arranged in the screw member along the axial direction. A powder supply device characterized by the above. 8. The powder supply apparatus according to claim 1, wherein the apparatus for receiving the powder supply is a powdery or granular material processing apparatus in which the internal pressure of the apparatus is substantially a negative pressure. A powder supply device characterized by the above.