JPH1077113A - Powder mixing apparatus and method for producing mixed powder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder mixing apparatus and a method for producing a mixed powder capable of minimizing the start / stop of a powder mixing apparatus and enabling highly accurate adjustment of raw material supply at startup. . SOLUTION: A level sensor 21a detects an upper limit level of the amount of accumulated raw material in a main powder hopper 11, and outputs a detection signal. The level sensor 21b is connected to the main powder hopper 11
The lower limit of the accumulated amount of the raw material is detected, and a detection signal is output.
The level sensors 23a and 23b detect the accumulated amount of the filling hopper 18 and output a detection signal. Controller 30
Calculates the respective weights from the measured rotation speeds of the main powder feeder 12 and the additive feeder 14 and the weights of the main powder and the additives on the main powder feeder 12 and the additive feeder 14. The controller 30 compares the supplied weight with the weight set in the controller 30,
2. PID control of the feed weight of the additive feeder 14 at each rotation speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder mixing apparatus and a method for producing a mixed powder, and more particularly, to a powder mixing step in which a mixing ratio and a kind of a mixture change.

[0002]

2. Description of the Related Art In many cases, powder products such as heavy detergents are produced as a fixed amount of powder in a granulation process and then mixed with powder separately produced as an additive. You. The mixing of the powder is performed during the period from the granulation step to the storage in the storage tank. That is, the powder product mixed with the additive is temporarily stored in a storage tank such as a silo, and is withdrawn from the silo by an appropriate amount at the time of packaging and packaged. For this reason, a powder product in a packaging line is not always processed in a fixed amount as in a powder production line. Further, there are a plurality of types of products to be manufactured, and components and additives manufactured in the granulation process vary.

[0003]

By the way, it is easy to mix powder before storing it in a silo in a conventional powder mixing apparatus for producing a heavy detergent or the like. However, when storing powder products mixed with powders such as coloring particles in a silo and switching the type to another powder product,
The powder product before the switching is left in the silo and mixed into the product after the switching. For this reason, every time the product is switched, the powder product before switching remaining in the silo needs to be manually removed. This removal operation is one of the obstacles to labor saving in the powder product manufacturing process.

One solution to this problem is to mix the powder before the packaging line. However, if the mixing is simply performed, the mixing device cannot follow stop and restart operations due to a change in the flow rate of the powder in the packaging line. Also,
There is a problem that the supply of raw materials from the silo cannot be adjusted according to the required amount of the packaging line. The present invention has been made under such a background, and in a packaging process of a powder product in which a plurality of powders are mixed, the starting and stopping of a powder mixing device is minimized, and the accuracy of raw material supply at the time of starting is reduced. It is an object of the present invention to provide a powder mixing apparatus and a method for producing a mixed powder that can be adjusted at a high level.

[0005]

According to the present invention, there is provided a powder mixing apparatus, comprising: storage means for storing powder; transport means for transporting the powder from the storage means; A first accumulating means for accumulating the powder, a first control means for controlling the conveying means based on the accumulated amount of the powder in the first accumulating means, and A first supply unit for supplying a body, a second storage unit that stores the powder supplied by the supply unit downstream of the first storage unit, and another mixing unit that mixes with the powder. A third accumulating means for accumulating powder, a second supplying means for supplying the other powder from the third accumulating means, provided between the first and second accumulating means. Mixing means for mixing the obtained powder and the other powder, and the powder of the second accumulating means. The accumulated amount, characterized by comprising when and a second control means for controlling said mixing means and said first and second supply means.

According to a second aspect of the present invention, in the powder mixing apparatus of the first aspect, there are a plurality of the second accumulating means,
The invention according to claim 3, further comprising a unit that selectively switches the supply of the mixed powder by the mixing unit. And first detecting means for detecting the amount of the powder stored in the first storing means. According to a fourth aspect of the present invention, in the powder mixing device of the first aspect, the second control means includes a second detection means for detecting an accumulation amount of the powder inside the second accumulation means. It is characterized by doing. According to a fifth aspect of the present invention, in the powder mixing apparatus according to the first aspect, the second control unit determines a weight of the powder on the belt feeder serving as the supply unit and a weight of the belt feeder serving as the supply unit. The supply weight of the powder is calculated based on the number of rotations of the motor, and the supply weight of the powder is controlled. According to a sixth aspect of the present invention, in the powder mixing apparatus of the first aspect, the powder supplied from the first storage means by the supply means and the powder supplied from the third storage means by the second supply means. When mixing with other powder to be supplied, the supply amount of the other powder corresponding to the mixing ratio to the supply amount of the powder, the supply amount of the powder calculated by the second control means And a mixing ratio set in the second control means. According to a seventh aspect of the present invention, in the powder mixing device of the first aspect, the transporting means has a higher transporting ability of the powder than the supplying means. The invention according to claim 8, wherein in the method for producing a mixed powder, a mixing step of mixing one powder with another powder, and a first supply step of supplying the powder to the mixing step by the supply means. And a second supply step of supplying the other powder to the mixing step by the other second supply means, and mixing the powder and the other powder in the second accumulation means. The mixing step, the first supply step, and the second supply step are controlled based on the measured value of the accumulated amount of the powder. According to a ninth aspect of the present invention, in the method for producing a mixed powder according to the eighth aspect, the method further comprises the step of supplying the mixed powder to the plurality of second storage means. The supply of the mixed powder is continued using the switching means until all of the plurality of storage means reach the upper limit.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a powder mixing device according to one embodiment of the present invention. The drawer conveyor 4 is provided for sending out the main powder from the raw material silo 1. The drawer conveyor 5 is provided for sending out additives from the raw material silo 2. The mixing device 8a draws out the main powder from the raw material silo 1 and the additive of the raw material silo 2 and is supplied by the conveyors 4 and 5.

[0008] The drawer conveyor 6 is provided for sending out additives from the raw material silo 2. The drawer conveyor 7 is provided for sending out the main powder from the raw material silo 3. The raw material device 8b is provided with a conveyer 6 for extracting the additive from the raw material silo 2 and the main powder from the raw silo 3.
And 7.

Next, the configuration of the mixing devices 8a and 8b will be described. The mixing devices 8a and 8b have a similar configuration. FIG. 2 is a block diagram showing a configuration of the mixing devices 8a and 8b of FIG. 1 according to one embodiment of the present invention. FIG.
Will be described for the mixing device 8a. The main powder hopper 11 uses the drawer conveyor 4 or 7 in FIG.
Supplied from The additive hopper 13 is moved by the drawer conveyor 5 or 6 in FIG.
Is supplied with additives.

The main powder hopper 11 is provided with a main powder feeder 12 for supplying a main powder raw material. The additive hopper 13 is provided with an additive feeder 14 for supplying the additive. Filling belt conveyor 1
Reference numeral 5 is provided for mixing and conveying the raw materials supplied from the main powder feeders 12 and 14 on a belt. Filling hoppers 17 and 18 are provided to accumulate raw materials from the filling belt conveyor 15.
The switching device 16 is provided to selectively select which of the filling hoppers 17 and 18 the raw material from the filling belt conveyor 15 is to be supplied to.

The level sensor 21a is connected to the main powder hopper 1
Detects the upper limit level of the accumulated amount of one raw material and outputs a detection signal. The level sensor 21b detects the lower limit level of the accumulated amount of the raw material in the main powder hopper 11, and outputs a detection signal. Similarly, the level sensors 22a and 22b detect the accumulated amount of the additive in the filling hopper 17 and output a detection signal.
The level sensors 23a and 23b detect the accumulated amount of the filling hopper 18 and output a detection signal.

The controller 30 supplies the respective supply weights based on the measured rotation speeds of the main powder feeder 12 and the additive feeder 14 and the weights of the main powder and the additives on the main powder feeder 12 and the additive feeder 14. Is calculated. The controller 30 compares the calculated supply weight with the supply weight set in the controller 30, and controls the supply weight of the main powder feeder 12 and the additive feeder 14 by PID according to the number of rotations of each.

Next, the operation of the above embodiment will be described with reference to FIG. 2 and the flowchart of FIG. When the packaging process is started, the operation of the mixing device is started to supply the powdered raw material in which the main powder and the additive are mixed to the packaging process. In step S1, the level sensor 22b checks the accumulated amount of the powder raw material inside the filling hopper 17. If the accumulated amount of the powder raw material inside the filling hopper 17 is at the lower level, the process proceeds to step S2. If the accumulated amount of the powder material in the filling hopper 17 is not at the lower level, the process proceeds to step S3. The level sensor 23b checks whether or not the accumulated amount of the powder raw material inside the filling hopper 18 is at a lower level.

If the detection results of the level sensors 22b and 23b are not at the lower level in both the filling hoppers 17 and 18, the process returns from step S3 to step S1. That is, until the powdery raw materials are taken out from the filling hoppers 11 and 12 and the detection results of the level sensors 22b and 23b become lower levels, step codes S1 and S3 are used.
Is repeated. Here, the accumulation amount of the filling hopper 17 is detected by the level sensor 22b to be a lower level, and the process proceeds to step S2. At this time, filling hopper 1
7 generates a start signal.

In step S2, upon receiving the start signal of the filling hopper 17, the switching unit 16 sets the charging belt conveyor 1
Main hopper 11 and additive hopper 13 supplied at 5
Is set so that the mixed powder with the above is transported to the filling hopper 17. After this setting, the process proceeds to step 5.

In step S5, the filling belt conveyor 15 moves the main powder raw material supplied from the main powder feeder 12 and the additive feeder 1 by the start signal of the filling hopper 17.
Activated to mix the additives supplied in 4 and to transport the mixed powder. At the same time, the main powder feeder 12 and the additive feeder 14 are activated to supply the main powder raw material and the additive to the filling belt conveyor 15, respectively.

At this time, the additive feeder 14 is started at the previously stopped rotation number or at a previously set rotation number. The weight of the main powder raw material supplied by the main powder feeder 12 is measured on a belt scale. Further, the feeder rotation speed of the main powder feeder 12 is measured. The controller 30 converts the weight and the feeder rotation speed into a supply weight value, and compares it with the stored supply weight setting value. According to the comparison result, the controller 30
PID control based on the number of revolutions of the main powder feeder 12 is performed so that the weight of the powder raw material supplied from the main powder hopper 11 by the main powder feeder 12 becomes a set value.

After the supply amount of the main powder by the main powder feeder 12 is controlled, the supply amount of the additive of the additive feeder 14 started at the rotation speed at the previous stop is controlled by the controller corresponding to the supply amount of the main powder. 30. That is, the weight of the additive supplied by the additive feeder 14 is measured on a belt scale. Further additive feeder 14
Is the feeder rotation speed.

The controller 30 calculates the supply weight from the weight value of the powdery raw material on the feeder and the number of rotations of the feeder, and sets the supply amount of the additive corresponding to the weight of the main powder stored in the controller 30. Is compared to According to the comparison result, the controller 30 sets the additive hopper 13
The additive supplied by the additive feeder 14 from
PID control based on the number of rotations of the additive feeder 14 is performed so that the set value of the supply weight stored in the controller 30 is obtained.

The main powder of the main powder feeder 12 and the additive of the additive feeder 14 whose supply amount is controlled by the controller 30 are mixed and conveyed by the filling belt conveyor 15. The mixed powder of the main powder and the additive to be conveyed is supplied to the filling hopper 17 by the switch 16 as processed in step S2. The process proceeds to step S6 in a state where the mixed powder of the main powder and the additive is supplied.

In step S6, the level sensor 22a
Confirms whether the accumulation amount of the filling hopper 17 is at the upper level. Here, when the level sensor 22a detects that the accumulated amount of the mixed powder inside the filling hopper 17 to which the mixed powder of the main powder and the additive is supplied is not the upper level by the switch 16, the processing is performed. Proceed to step S8.

In step S8, the level sensor 23a
Confirms whether the accumulation amount of the filling hopper 18 is at the upper level. Here, when the level sensor 23a detects that the accumulated amount of the filling hopper 18 to which the mixed powder of the main powder and the additive is not supplied is not at the upper level, the process proceeds to step S10.

In step S10, the level sensor 22
b confirms whether the accumulation amount of the filling hopper 17 is at the lower level. Here, the level sensor 22b determines that the accumulated amount of the filling hopper 17 to which the mixed powder of the main powder and the additive is supplied by the switch 16 is not at the lower level.
, The process proceeds to step S12.

In step S12, the level sensor 23
b confirms whether the accumulation amount of the filling hopper 18 is at the lower level. Here, the filling hopper 18 to which the mixed powder of the main powder and the additive is not supplied by the switch 16
Level sensor 22 indicates that the accumulated amount of
If detected by b, the process proceeds to step S6, and the process from step 6 is repeated until a branch condition is detected.

In the loop processing from step S6 to step S12, the filling hopper 18
The level sensor 23b detects that the accumulated amount of the filling hopper 18 is at the lower level. The controller 30 confirms the shortage of the mixed powder of the main powder and the additive in the filling hopper 18 based on the detection signal. Controller 30
Goes to the process of step S13 in order to preferentially supply the mixed powder of the main powder and the additive to the filling hopper 18.

In step S13, the controller 30 controls the switching unit 16 so that the mixed powder of the main powder and the additive supplied to the filling hopper 17 by the filling belt conveyor 15 is supplied to the filling hopper 18. . The accumulated amount of the mixed powder of the main powder and the additive in both the filling hopper 17 and the filling hopper 18 is controlled by the operation of the controller 30 in step S12 and step S13 so as not to be insufficient in the packaging process. After this operation, the process proceeds to step S6.

In step S6, the level sensor 22a of the filling hopper 17 checks whether the accumulated amount of the filling hopper 17 is at the upper level. Here, when the level sensor 22a detects that the accumulated amount of the filling hopper 17 to which the mixed powder of the main powder and the additive is supplied is not the upper level by the switch 16, the process proceeds to step S8.

In step S8, the level sensor 23a of the filling hopper 18 checks whether the accumulated amount of the filling hopper 18 is at the upper level. Here, the level sensor 23a detects that the accumulated amount of the filling hopper 18 to which the mixed powder of the main powder and the additive is supplied by the switch 16 is at the upper level. Since the accumulated amount of the mixed powder of the main powder and the additive in the filling hopper 18 exceeds the capacity of the filling hopper 18, the process of the controller 30 proceeds to step S9.

In step S9, the level sensor 22a
Confirms whether the accumulation amount of the filling hopper 17 is at the upper level. Here, the level sensor 22a detects that the accumulated amount of the filling hopper 17 to which the mixed powder of the main powder and the additive is not supplied by the switch 16 is not the upper level. It is confirmed that the filling hopper 17 has room to fill, and the process proceeds to step S11.

In step S11, the switch 16 stops the supply of the mixed powder of the main powder and the additive conveyed by the filling belt conveyor 15 to the filling hopper 18 and supplies the mixed powder to the filling hopper 17 by the controller 30. Is controlled. After this processing, the processing of the controller 30 proceeds to step S6.

In step S9, the switch 16
Accordingly, the level sensor 22a detects that the accumulated amount of the mixed powder of the main powder and the additive in the filling hopper 17 to which the mixed powder of the main powder and the additive is not supplied is at the upper level. It is confirmed by the controller 30 that the filling hopper 17 is filled with the mixed powder of the main powder and the additive having a specified value or more, and there is no room for newly filling. Here, the controller 30 confirms that the accumulated amount of the mixed powder of the main powder and the additive in the filling hopper 17 and the filling hopper 18 is equal to or more than a specified value. That is, it is confirmed by the controller 30 that the accumulated amount of the mixed powder in the packaging process is sufficient, and that the processing of the mixing process of the main powder and the additive is not necessary, and the controller 3
The process of 0 proceeds to step S14.

In step S14, in steps S6 and S7, the controller 30 detects that the mixing step of the main powder and the additive is not necessary, and stops the activation of the mixing device. That is, the operations of the filling belt conveyor 15, the main powder feeder 12, and the additive feeder 14 are stopped by the controller 30, and the supply of the mixed powder to the filling feeder 17 and the filling feeder 18 is as follows.
Stopped. After stopping the mixing device, the process of the controller 30 proceeds to Step S15.

In step S15, the controller 30
Confirms whether the packaging process has been completed. When the packaging process is completed, the function of the controller 30 is stopped. If not, the process proceeds to step S1, and the loop processing from step S1 to step S3 is repeated unless a change is detected. By such control, the start and stop of the main powder feeder 12 and the additive feeder 14 for performing powder mixing can be minimized, and stable and accurate powder mixing and supply can be performed regardless of the operation of the packaging process.

The supply of the main powder and the additives from the raw material silo 1 and the raw material silo 2 to the main powder hopper 11 and the additive hopper 13 is independent of the flowchart of FIG. That is, the main powder is supplied from the raw silo 1 to the main powder hopper 11 by the drawer 4. When the level sensor 21b detects that the accumulated amount of the powder in the main powder hopper 11 is at the lower level, the supply of the main powder to the main powder hopper 11 is started. When the level sensor 21a detects that the amount of accumulated powder in the main powder hopper 11 is at the upper level, the supply of the main powder to the main powder hopper 11 is stopped. Always the main powder hopper 1
The accumulation amount of the powder 1 is always controlled by the detection results of the level sensor 21a and the level sensor 21b.

In the description of this embodiment, mixing of powders has been described. However, in practice, heavy detergents, light detergents, powder bleaching agents, and the like are conceivable. In addition, the present invention can be applied to a line in which another kind of powder is mixed with powder generally stored and supplied to the intermediate layer.

As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and a design change or the like may be made without departing from the gist of the present invention. The present invention is also included in the present invention. For example, the mixed powder conveyed by the filling belt conveyor 15 is
In the above, the supply is selectively switched to either one of the filling hoppers 17 and 18. However, the switching can be performed by the filling belt conveyor 15. That is, when the supply destination of the mixed powder is changed to the filling hoppers 17 and 18, the conveyance direction of the filling belt conveyor 15 is changed by changing the rotation direction of the driving device of the filling belt conveyor 15. In this case, it is not necessary to use the switch 16 for changing the supply destination of the powder raw material, and there is an effect that the configuration of the mixer is simplified.

In connection with the description of the claims, the present invention further includes the following claims. (Claim 10) The first detection means detects the accumulation level of the powder accumulated in the first accumulation means by a level sensor installed at at least two places of the first accumulation means. 4. The powder mixing device according to claim 3, wherein the mixing is performed. (Claim 11) The second detection means detects the accumulation level of the powder accumulated in the second accumulation means by a level sensor installed at at least two places of the second accumulation means. The powder mixing apparatus according to claim 4, wherein the mixing is performed. (Claim 12) The second control means adjusts the supply weight of the powder by the supply means by PID control based on the number of revolutions of a belt feeder as the supply means. A powder mixing apparatus as described in the above.

[0038]

As described above, according to the first aspect of the present invention, the storage means for storing the powder, the transfer means for transferring the powder from the storage means, and the transfer means for transferring the powder from the storage means. A first accumulating means for accumulating the powder, a first control means for controlling the conveying means based on the accumulated amount of the powder in the first accumulating means, and A first supply unit for supplying a body, a second storage unit that stores the powder supplied by the supply unit downstream of the first storage unit, and another mixing unit that mixes with the powder. A third accumulating means for accumulating powder, a second supplying means for supplying the other powder from the third accumulating means, provided between the first and second accumulating means. Mixing means for mixing the obtained powder and the other powder; and With the second control means for controlling the first and second supply means and the mixing means, according to the accumulation amount, according to the amount of the powder stored in the second and third accumulation means Since the supply of the powder can be adjusted, there is an effect that the start and stop of the mixing device can be minimized.

According to a second aspect of the present invention, in the powder mixing apparatus of the first aspect, there is provided a plurality of the second accumulating means, and means for selectively switching the supply of the mixed powder by the mixing means. Therefore, there is an effect of minimizing the start and stop of the apparatus in the process of packaging the mixed powder and improving the efficiency of the operation. The invention according to claim 3 is:
2. The powder mixing apparatus according to claim 1, wherein the first control means includes first detection means for detecting the amount of the powder stored in the first storage means. There is an effect that the accumulated amount of the powder accumulated inside can be constantly monitored. According to a fourth aspect of the present invention, in the powder mixing apparatus according to the first aspect, the second control means detects the accumulated amount of the powder in the second accumulation means. Since the means is provided, there is an effect that the accumulated amount of the powder accumulated in the second accumulation means can be constantly monitored. According to a fifth aspect of the present invention, in the powder mixing apparatus of the first aspect, the second control means includes a weight of the powder on a belt feeder serving as the supply means and a belt serving as the supply means. Based on the number of rotations of the motor of the feeder, the supply weight of the powder is calculated, and the supply weight of the powder is controlled, so that the effect of accurately supplying the amount of the powder supplied by the belt feeder is achieved. is there. The invention according to claim 6 is the same as the claim 1.
The powder mixing apparatus according to claim 1, wherein the powder supplied from the first storage unit by the supply unit is mixed with another powder supplied from another third storage unit by the second supply unit. In this case, the supply amount of the other powder corresponding to the mixing ratio with respect to the supply amount of the powder is set in the supply amount of the powder calculated by the second control unit and the second control unit. Since it is calculated from the determined mixing ratio, the supply of the required amount of the powder and the other powder corresponding to the mixing ratio can be controlled with high accuracy. According to a seventh aspect of the present invention, in the powder mixing apparatus according to the first aspect, since the conveying means has a higher conveying capacity of the powder than the supplying means, Since a sufficient amount is provided, the mixing device has an effect that stop and restart can be controlled to a small extent. The invention according to claim 8 is the same as the invention according to claim 1.
In the method for producing a mixed powder according to the aspect, a mixing step of mixing one powder with another powder, a first supply step of supplying the powder to the mixing step by the supply unit, and the other A second supply step of supplying the other second powder to the mixing step by a second supply means, and accumulating a mixed powder of the powder and the other powder in the second accumulation means. Since the mixing step, the first supply step and the second supply step are controlled by the measured value of the amount, the supply of the powder according to the amount of the powder stored in the second storage means can be adjusted. This has the effect of minimizing the start and stop of the mixing device and producing a mixed powder having a highly accurate mixing ratio. The invention according to claim 9 is
9. The method for producing a mixed powder according to claim 8, comprising the step of supplying the mixed powder to a plurality of storage means, and once the mixing and supply operation is started, all of the plurality of second storage means must be used. Since the supply of the mixed powder is continued by using the switching means until the upper limit is reached, the start and stop of the mixing line are suppressed to a minimum, and the generation of an inaccurate mixture of the mixing ratio which tends to occur at the start of mixing is minimized. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration using a mixing device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a mixing device according to one embodiment of the present invention.

FIG. 3 is a flowchart showing a flow of an operation of the mixing device according to the embodiment of the present invention.

[Explanation of symbols]

 1, 2, 3 Material silo 4, 5, 6, 7 Drawer conveyor 8a, 8b Mixing device 11 Main powder hopper 12 Main powder feeder 13 Additive hopper 14 Additive feeder 15 Filling belt conveyor 16 Switching device 17, 18 Filling hopper 21a , 21b Level sensor 22a, 22b Level sensor 23a, 23b Level sensor 30 Controller

Claims (9)

[Claims] A storage means for storing the powder; a transport means for transporting the powder from the storage means; a first storage means for storing the powder transported by the transport means; First control means for controlling the transport means according to the amount of the powder stored in one storage means; first supply means for supplying the powder from the first storage means; A second accumulating means for accumulating the powder supplied by a means downstream of the first accumulating means; a third accumulating means for accumulating another powder to be mixed with the powder; Second supply means for supplying the other powder from the storage means, and mixing the powder and the other powder provided between the first and second storage means Mixing means, the first and second supply means according to the amount of the powder stored in the second storage means And a second control means for controlling the mixing means. 2. A powder mixing apparatus according to claim 1, wherein there are a plurality of said second accumulation means, and a means for selectively switching the supply of the mixed powder by said mixing means is provided. 3. The powder mixing apparatus according to claim 1, wherein said first control means includes first detection means for detecting an amount of the powder stored in the first storage means. apparatus. 4. The powder mixing apparatus according to claim 1, wherein said second control means includes second detection means for detecting the amount of the powder stored in the second storage means. apparatus. 5. The second control means, based on a weight of the powder on a belt feeder serving as the supply means and a rotation speed of a motor of the belt feeder serving as the supply means,
The powder mixing apparatus according to claim 1, wherein the supply weight of the powder is calculated, and the supply weight of the powder is controlled. 6. When mixing the powder supplied by the supply means from the first storage means with another powder supplied by the second supply means from the third storage means, The supply amount of the other powder corresponding to the mixing ratio to the supply amount of the body, from the supply amount of the powder calculated in the second control means and the mixing ratio set in the second control means 2. The powder mixing device according to claim 1, wherein the value is obtained by calculation. 7. The powder mixing apparatus according to claim 1, wherein said conveying means has a higher conveying ability of said powder than said supplying means. 8. A mixing step of mixing one powder with another powder, a first supply step of supplying the powder to the mixing step by the supply unit, and the other supply unit by the other supply unit. A second supply step of supplying the powder to the mixing step, the mixing step, the second storage means by the measured value of the accumulated amount of the mixed powder of the powder and the other powder, the mixing step, A method for producing a mixed powder, comprising controlling a first supply step and a second supply step. 9. A process for supplying mixed powder to a plurality of second storage means, wherein once the mixing and supply operation is started, the switching means is always operated until all of the plurality of storage means reach the upper limit. The method for producing a mixed powder according to claim 8, wherein the supply of the mixed powder to be used is continued.