JP5772016B2 - Powder supply apparatus and powder supply method - Google Patents

Description

  The present invention relates to a powder supply apparatus and a powder supply method for supplying powder.

  Conventionally, the technique of the powder supply apparatus which supplies powder is well-known (for example, patent document 1).

  In the conventional powder supply apparatus, in order to cut out powder in a fixed amount, the powder is controlled by volume by a grinding method and controlled so as to supply a fixed amount of powder.

  As shown in FIG. 8, a conventional powder supply apparatus 1000 of a scraping method has a housing portion 1100 and a shutter 1200. When the conventional powder supply apparatus 1000 supplies the powder 1300 in the container 1100 into the powder container 1400, the shutter 1200 is positioned between the container 1100 and the powder container 1400 (supply stop position). The supply of the powder 1300 is started by moving the shutter 1), and the supply of the powder 1300 is stopped by moving the shutter 1200 to the supply stop position.

  However, when the shutter 1200 is present at the supply stop position, a clearance between the shutter 1200 and the accommodating portion 1100 has occurred. And the said clearance was larger than the powder powder diameter. As a result, powder leakage occurred when the shutter 1200 was worn.

  In addition, since the conventional powder supply apparatus 1000 manages the supply amount of the powder 1300 by volume, the weight variation of the powder 1300 supplied into the powder container 1400 may increase. Thereby, for example, when the powder (metal magnetic particles) 1300 supplied into the powder container 1400 is press-molded to produce a powder magnetic body (a component obtained by compacting a magnetic material), the powder is produced. There was a case where the quality of the powder magnetic material varied greatly.

JP-A 63-66020

  The present invention provides a powder supply apparatus and a powder supply method capable of suppressing powder leakage and reducing the variation in weight of the powder supplied into the powder container.

ただし、前記［数１］に関して、
ｔ₀は、前記孔部の開放が開始される時間を示し、
ｔ_w0は、前記孔部の開放後、前記重量計測部の計測値が増加し始める時間を示し、
ｔ₁は、前記孔部の開放量が前記一定の大きさに保持されている期間の開始時間を示し、
ｔ₂は、前記孔部の開放量が前記一定の大きさに保持されている期間の終了時間を示し、
ｔ_w2およびｔ_w3は、ｔ_w1＜ｔ_w2＜ｔ_w3＜ｔ₂＋ｔ_L、の範囲内の時間であり、
ω（ｔ_w2）は、時間ｔ_w2のときの前記重量計測部の計測値を示し、
ω（ｔ_w3）は、時間ｔ_w3のときの前記重量計測部の計測値を示す。

ただし、前記［数２］において、
ｔ ₄ は、前記孔部の開放が開始される時間を示し、
ｔ _w4 は、前記孔部の開放後、前記重量計測部の計測値が増加し始める時間を示し、
ｔ ₅ は、前記孔部の開放量が前記一定の大きさに保持されている期間の開始時間を示し、
ｔ ₆ は、前記孔部の開放量が前記一定の大きさに保持されている期間の終了時間を示し、
ｘ（ｔ）は、前記孔部の開放量を示し、
Ｓは、ｘ（ｔ）の時間積分を示し、
ΔＳは、単位時間あたりのＳの変化量を示し、
Δωは、単位時間あたりの前記重量計測部の計測値の変化量を示し、
ｔ _wa は、ｔ _w5 ＜ｔ _wa ＜ｔ ₆ 、の範囲内の時間であり、
β（ｔ _wa ）は、時間ｔ _wa のときのβの値を示し、
Ｓ（ｔ _wa ）は、時間ｔ ₄ からｔ _wa の範囲でｘ（ｔ）を時間積分したときの値を示し、
ω _f は、前記粉体の供給が開始されるときの前記重量計測部の計測値を示し、
ω（ｔ _wa ）は、時間ｔ _wa のときの前記重量計測部の計測値を示す。 The powder supply apparatus according to claim 1,
A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
When the powder is supplied into the powder container by the control unit, the amount of the suspended powder is stable when the flow rate of the powder falling by its own weight from the hole after the hole is opened is stabilized. Calculated based on the flow velocity of the powder at the time, or the time integration of the opening amount of the hole while the flow rate of the powder falling by its own weight from the hole is stable, and at that time It is calculated based on the difference from the measured value of the weight measuring unit.
Moreover, the powder supply apparatus according to claim 2 comprises:
A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
When the powder is supplied into the powder container by the control unit, the amount of the suspended powder is stable when the flow rate of the powder falling by its own weight from the hole after the hole is opened is stabilized. It is calculated based on the flow rate of the powder when being.
Moreover, the powder supply apparatus according to claim 3 is:
A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
The floating powder quantity, in the case where the powder by the control unit is supplied to the powder in the container, after opening of the hole, the flow rate of the powder to be free-fall before Kiana unit stable It is calculated based on the difference between the time integration of the opening amount of the hole during the period and the measured value of the weight measuring unit at that time.
Moreover, the powder supply apparatus according to claim 4 comprises:
A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closes by weight, the target weight is I corrected value der in accordance with a predetermined floating amount of powder, with the values shown in the following [Equation 1], the floating powder quantity, the control When the powder is supplied into the powder container by the part, the flow rate of the powder when the flow rate fluctuation of the powder falling by its own weight from the hole is stable after the opening of the hole Ru is calculated as a value in the following Expression 1 on the basis of,
Or
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder, and is a value represented by the following [Equation 2]. In the case where the powder is supplied into the powder container by the above, after the opening of the hole, the opening amount of the hole while the flow rate of the powder falling by its own weight from the hole is stable. The powder supply apparatus calculated so that it may become the value shown in the following [Equation 2] based on the difference of time integration and the measured value of the said weight measurement part at that time.

However, regarding the above [Equation 1],
t ₀ indicates the time when the opening of the hole starts,
t _w0 indicates the time when the measured value of the weight measuring unit starts to increase after the opening of the hole,
t ₁ indicates a start time of a period in which the opening amount of the hole is held at the constant size;
t ₂ represents the end time of the period during which the opening amount of the hole is held in the predetermined size,
t _w2 and t _w3 are times within the range of t _w1 <t _w2 <t _w3 <t ₂ + t _L ,
ω (t _w2 ) represents the measurement value of the weight measurement unit at time t _w2 ,
ω (t _w3 ) indicates a measurement value of the weight measurement unit at time t _w3 .

However, in [Formula 2],
t ₄ indicates the time when the opening of the hole starts,
t _w4 indicates the time when the measurement value of the weight measurement unit starts to increase after the opening of the hole,
t ₅ represents the start time of a period in which the opening amount of the hole is held at the constant size;
t ₆ indicates the end time of the period during which the opening amount of the hole is held in the predetermined size,
x (t) represents the opening amount of the hole,
S represents the time integral of x (t),
ΔS represents the amount of change in S per unit time,
Δω indicates the amount of change in the measurement value of the weight measurement unit per unit time,
t _wa is a time in the range of t _w5 <t _wa <t ₆ ,
β (t _wa ) indicates the value of β at time t _wa ,
S (t _wa ) represents a value when x (t) is integrated over time in the range of time t ₄ to t _wa ;
ω _f indicates the measurement value of the weight measurement unit when the supply of the powder is started,
ω (t _wa ) indicates the measurement value of the weight measurement unit at time t _wa .

ただし、前記［数１］に関して、
ｔ₀は、前記孔部の開放が開始される時間を示し、
ｔ_w0は、前記孔部の開放後、前記重量計測部の計測値が増加し始める時間を示し、
ｔ₁は、前記孔部の開放量が前記一定の大きさに保持されている期間の開始時間を示し、
ｔ₂は、前記孔部の開放量が前記一定の大きさに保持されている期間の終了時間を示し、
ｔ_w2およびｔ_w3は、ｔ_w1＜ｔ_w2＜ｔ_w3＜ｔ₂＋ｔ_L、の範囲内の時間であり、
ω（ｔ_w2）は、時間ｔ_w2のときの前記重量計測部の計測値を示し、
ω（ｔ_w3）は、時間ｔ_w3のときの前記重量計測部の計測値を示す。 In the powder supply apparatus according to claim 5 ,
Before Symbol floating powder quantity and the valve closes weight becomes the value shown in Expression 1 below.

However, regarding the above [Equation 1],
t ₀ indicates the time when the opening of the hole starts,
t _w0 indicates the time when the measured value of the weight measuring unit starts to increase after the opening of the hole,
t ₁ indicates a start time of a period in which the opening amount of the hole is held at the constant size;
t ₂ represents the end time of the period during which the opening amount of the hole is held in the predetermined size,
t _w2 and t _w3 are times within the range of t _w1 <t _w2 <t _w3 <t ₂ + t _L ,
ω (t _w2 ) represents the measurement value of the weight measurement unit at time t _w2 ,
ω (t _w3 ) indicates a measurement value of the weight measurement unit at time t _w3 .

ただし、前記［数２］において、
ｔ₄は、前記孔部の開放が開始される時間を示し、
ｔ_w4は、前記孔部の開放後、前記重量計測部の計測値が増加し始める時間を示し、
ｔ₅は、前記孔部の開放量が前記一定の大きさに保持されている期間の開始時間を示し、
ｔ₆は、前記孔部の開放量が前記一定の大きさに保持されている期間の終了時間を示し、
ｘ（ｔ）は、前記孔部の開放量を示し、
Ｓは、ｘ（ｔ）の時間積分を示し、
ΔＳは、単位時間あたりのＳの変化量を示し、
Δωは、単位時間あたりの前記重量計測部の計測値の変化量を示し、
ｔ_waは、ｔ_w5＜ｔ_wa＜ｔ₆、の範囲内の時間であり、
β（ｔ_wa）は、時間ｔ_waのときのβの値を示し、
Ｓ（ｔ_wa）は、時間ｔ₄からｔ_waの範囲でｘ（ｔ）を時間積分したときの値を示し、
ω_fは、前記粉体の供給が開始されるときの前記重量計測部の計測値を示し、
ω（ｔ_wa）は、時間ｔ_waのときの前記重量計測部の計測値を示す。 In the powder supply apparatus according to claim 6 ,
Before Symbol floating powder quantity and the valve closing weight, the values shown in Equation 2 below.

However, in [Formula 2],
t ₄ indicates the time when the opening of the hole starts,
t _w4 indicates the time when the measurement value of the weight measurement unit starts to increase after the opening of the hole,
t ₅ represents the start time of a period in which the opening amount of the hole is held at the constant size;
t ₆ indicates the end time of the period during which the opening amount of the hole is held in the predetermined size,
x (t) represents the opening amount of the hole,
S represents the time integral of x (t),
ΔS represents the amount of change in S per unit time,
Δω indicates the amount of change in the measurement value of the weight measurement unit per unit time,
t _wa is a time in the range of t _w5 <t _wa <t ₆ ,
β (t _wa ) indicates the value of β at time t _wa ,
S (t _wa ) represents a value when x (t) is integrated over time in the range of time t ₄ to t _wa ;
ω _f indicates the measurement value of the weight measurement unit when the supply of the powder is started,
ω (t _wa ) indicates the measurement value of the weight measurement unit at time t _wa .

In the powder supply apparatus according to claim 7 ,
The control part opens the hole part by the valve part, maintains the opening amount of the hole part at a constant size, and further closes the hole part as one cycle. By repeating, the powder is supplied into the powder container,
The target weight and the valve closing weight are set for each of the plurality of cycles.

In the powder supply apparatus according to claim 8 ,
The control unit stores an error between the measurement value of the weight measurement unit and the target weight at the completion of the plurality of cycles, and corrects the valve closing weight based on the stored error.

In the powder supply apparatus according to claim 9 ,
The opening amount of the hole portion when the opening amount of the hole portion is held at a constant size by the valve portion can be adjusted step by step for each of the plurality of cycles.

The powder supply method according to claim 10 ,
A powder supply method for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit ,
The valve portion is moved upward and comes into contact with the peripheral edge portion of the hole portion, thereby eliminating the gap between the hole portion and closing the hole portion, and moving downward and between the hole portion. By using a powder supply device that opens the hole by generating a gap ,
The control unit causes the valve unit to open the hole, holds the opening of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole in the valve when the weight reaches a predetermined valve closing weight;
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
When the powder is supplied into the powder container by the control unit, the amount of the suspended powder is stable when the flow rate of the powder falling by its own weight from the hole after the hole is opened is stabilized. Calculated based on the flow velocity of the powder at the time, or the time integration of the opening amount of the hole while the flow rate of the powder falling by its own weight from the hole is stable, and at that time It is calculated based on the difference from the measured value of the weight measuring unit.

  According to the present invention, powder leakage can be suppressed and weight variation of the supplied powder can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the powder supply apparatus which is one Embodiment of the powder supply apparatus which concerns on this invention. The diagram showing the 1st line, the 2nd line, and the 3rd line. The diagram showing the 1st line, the 2nd line, and the 3rd line. The figure which represented the flowchart when correct | amending valve closing weight in case a control part repeats a cycle in multiple times. The solid line is a diagram showing a line when the valve closing weight of the first cycle is configured as ω _1old, and the dashed line is a diagram showing a line when the valve closing weight of the first cycle is configured as ω ₁ . . The block diagram which represents the state of the valve | bulb part when a control part repeats a cycle in multiple times and comprises the opening amount of a hole part small in steps for every said several cycle. FIG. 6 is a diagram showing a line when the control unit repeats a cycle a plurality of times and configures the opening amount of the hole portion to be small step by step for each of the plurality of cycles. The block diagram showing the conventional powder supply apparatus.

  Below, the powder supply apparatus 100 which is one Embodiment of the powder supply apparatus which concerns on this invention is demonstrated with reference to drawings.

Powder supplying device 100 is a device for supplying a powder 1 of a given target weight omega _d in the powder container 2.
The powder 1 is, for example, metal magnetic particles used for manufacturing a dust magnetic body (a component obtained by compacting a magnetic material). In the powder magnetic body, powder (metal magnetic particles) 1 is supplied into a powder container 2, and the powder 1 supplied into the powder container 2 is supplied into a mold and press-molded. Manufactured by.
The target weight ω _d is appropriately determined according to the type of product manufactured using the powder 1.

  As shown in FIG. 1, the powder supply apparatus 100 includes a storage unit 11, a valve unit (rod unit 12 and actuator 13), a weight measurement unit 14, and a control unit 15.

The accommodating part 11 has a bottomed container shape, and an accommodating space in which the powder 1 can be accommodated is formed. At the bottom (lower part) of the storage part 11, there is a hole 11 a that allows communication between the storage space and the outside of the storage part 11 and allows the powder 1 in the storage space to flow out of the storage part 11. Is formed.
The hole 11 a of the housing part 11 is arranged above the powder container 2.

The valve portion is a device for cutting out the powder 1, and is a device capable of opening and closing the hole 11a of the storage portion 11.
The valve portion has a rod portion 12 and an actuator 13.

The rod part 12 has a bar shape extending vertically. At the lower end of the rod portion 12, a tapered portion 12 a is formed that increases in diameter as it goes downward.
The rod portion 12 is inserted through the housing space of the housing portion 11 in the vertical direction, and a lower end portion of the rod portion 12 projects outward from the housing portion 11 through the hole portion 11a. In the taper portion 12a at the lower end of the rod portion 12, the lower dimension is configured to be larger than the dimension of the hole 11a, and the upper dimension is configured to be smaller than the dimension of the hole 11a.

  The actuator (cylinder, motor, etc.) 13 is connected to the rod portion 12, and is configured to be able to move the rod portion 12 up and down.

When the rod portion 12 is moved upward by the actuator 13 and the taper portion 12a comes into contact with the peripheral edge portion of the hole portion 11a, the gap between the hole portion 11a and the taper portion 12a disappears, and the hole portion 11a is closed. Thereby, the powder 1 in the accommodation space is blocked from falling by its own weight through the hole 11a.
Further, when the rod portion 12 is moved downward by the actuator 13 from the state where the hole portion 11a is closed by the taper portion 12a, a gap is generated between the hole portion 11a and the taper portion 12a. (A part of the hole 11a) is opened. As a result, the powder 1 in the accommodation space falls by its own weight through the hole 11a (specifically, the gap between the inner peripheral surface of the hole 11a and the outer peripheral surface of the tapered portion 12a), and the powder 1 To be supplied.
Further, as described above, the tapered portion 12a increases in diameter as it goes downward. Accordingly, the actuator 13 moves the position of the rod portion 12 upward, so that the size of the gap between the hole portion 11a and the tapered portion 12a (the opening amount of the hole portion 11a) is reduced, and the position of the rod portion 12 is changed. By moving downward, the opening amount of the hole 11a is increased.
From the hole 11a, the powder 1 having a weight corresponding to the opening amount of the hole 11a flows out (self-weight drop).

  The weight measurement unit (electronic balance or the like) 14 has the powder container 2 mounted thereon, and measures the weight of the powder 1 supplied into the powder container 2.

  The control unit 15 includes a calculation unit (CPU), a storage unit (HDD, semiconductor memory, etc.), and can be configured by a computer.

The control unit 15 is connected to the actuator 13.
The control unit 15 transmits the closing signal to the actuator 13 to move the rod unit 12 upward by the actuator 13. In addition, the control unit 15 transmits the open signal to the actuator 13 to move the rod unit 12 downward by the actuator 13.
The control unit 15 can change the opening amount of the hole portion 11a by transmitting the closing signal / opening signal to the actuator 13 and changing the position of the rod portion in the vertical direction. The outflow amount of the powder 1 from the hole 11a is changed.
Moreover, when the control part 15 moves the rod part 12 up and down by the actuator 13, it can change the moving speed of the rod part 12, and can change the opening-and-closing speed of the hole part 11a.

  The control unit 15 is connected to the weight measurement unit 14 and can receive information on the weight of the powder 1 in the powder container 2 from the weight measurement unit 14.

  The control unit 15 opens the closed hole portion 11a by the valve portion (the rod portion 12 and the actuator 13), holds the opening amount of the hole portion 11a at a constant size, and further opens the open state. The cycle until the hole 11a is closed by the valve is one cycle, and the cycle is repeated twice to supply the powder 1 into the powder container 2. In addition, the control unit 15 starts the second cycle after a predetermined time has elapsed after the completion of the first cycle.

In the first cycle, a large amount of powder 1 is supplied. In the first cycle, the target weight is set to the target weight ω _d1 . Further, in the first cycle, the opening amount of the hole portion 11a (valve opening amount) is larger than that of the second cycle, and the opening / closing speed of the hole portion 11a is set high (high-speed powder supply). This is because a large amount of powder 1 is supplied into the powder container 2 in a short time.

In the first cycle, the control unit 15, the valve unit is opened (the rod portion 12 and the actuator 13) by holes 11a, and to hold the opening amount of the aperture 11a at a constant magnitude x _1, further weight When the weight of the powder 1 in the powder container 2 received from the measurement unit 14 reaches a predetermined valve closing weight ω ₁ , the hole 11 a is closed by the valve unit, whereby the powder 1 is removed from the powder container 2. Supply in.

Hereinafter, the valve closing weight ω ₁ will be described with reference to the first line 16 and the third line 18 of FIG.

2 and 3, the first line 16, the second line 17, and the third line 18 are represented.
The first line 16 is a line indicating the relationship between the time t and the opening amount x (valve opening amount x) of the hole portion 11a when the hole portion 11a is opened and closed by the control unit 15 in the first cycle. .
The second line 17 is a line indicating the relationship between the time t and the opening amount x (valve opening amount x) of the hole portion 11a when the hole portion 11a is opened and closed by the control unit 15 in the second cycle. . The description of the second cycle will be described later.
The third line 18 is a line indicating the relationship between the time t and the measured value ω of the weight measuring unit 14 when the hole 11a is opened / closed as shown in the first line 16 and the second line 17. .

The valve closing weight ω ₁ is a value obtained by correcting the target weight ω _{d1 according} to a predetermined suspended powder amount ω _a1 .
As shown in the first line 16 and the third line 18 in FIG. 2, the suspended powder amount ω _a1 falls under its own weight from the hole 11 a when the powder 1 is supplied into the powder container 2 by the control unit 15. Is the estimated weight of the powder 1 existing (floating) between the hole 11a and the powder container 2 when the flow fluctuation of the powder 1 is stable, and after opening the hole 11a, It is calculated based on the flow rate α of the powder 1 when the flow rate fluctuation of the powder 1 falling by its own weight from the hole 11a is stable.
The suspended powder amount ω _a1 and the valve closing weight ω ₁ are specifically the values shown in the following [Equation 1].

However, regarding the above [Equation 1],
t ₀ indicates the time when opening of the hole 11a is started,
t _w0 indicates the time when the measured value of the weight measuring unit 14 starts to increase after the hole 11a is opened,
t ₁ indicates the start time of a period in which the opening amount of the hole 11a is held at the constant size x ₁ ;
t ₂ represents the end time of the period during which the opening amount of the hole 11a is held in the predetermined size x _1,
t _w2 and t _w3 are times within the range of t _w1 <t _w2 <t _w3 <t ₂ + t _L , that is, a time during which the flow rate fluctuation of the powder 1 falling by its own weight from the hole 11a is stable. Yes,
ω (t _w2 ) indicates the measurement value of the weight measurement unit 14 at time t _w2 ,
ω (t _w3 ) indicates a measurement value of the weight measurement unit 14 at time t _w3 .

As described above, the flow rate of the powder 1 falling by its own weight from the hole 11a is measured in real time, and the flow rate α of the powder 1 when the flow rate fluctuation of the powder 1 is stable after the opening of the hole 11a is obtained. The detection delay amount (floating powder amount ω _a1 ) of the weight measuring unit 14 is estimated, and the timing for closing the hole portion 11a is configured earlier by that amount ((valve closing weight ω ₁ ) = (target weight ω _d1 ) − (Floating powder amount ω _a1 )). As a result, the powder supply apparatus 100 can reduce the variation in the weight with respect to the target weight ω _{d1 with} respect to the powder 1 supplied into the powder container 2, and can supply the powder 1 with high accuracy. Become.
In addition, the powder supply device 100 determines the timing for closing the hole 11 a with the weight of the powder 1 supplied into the powder container 2. Thereby, it is possible to reduce the weight variation of the powder 1 supplied into the powder container 2.
In addition, the powder supply apparatus 100 is not a wear-off system like the conventional powder supply apparatus 1000, but a system for managing the supply amount of the powder 1 by controlling the opening / closing of the hole 11a of the storage unit 11. Therefore, it is possible to suppress powder leakage.

In the second cycle, a smaller amount of powder 1 is supplied than in the first cycle. In the second cycle, the target weight is set to the target weight ω _d2 (= ω _d ). In the second cycle, the opening amount of the hole 11a is smaller than that in the first cycle, and the opening / closing speed of the hole 11a is low (high-precision powder supply). This is to prevent the powder 1 from dropping due to the impact of the high-speed operation of the rod portion 12 and to supply the powder 1 into the powder container 2 with high accuracy.

In the second cycle, the control unit 15 opens the hole 11a by the valve unit (the rod unit 12 and the actuator 13) after a predetermined time has elapsed after completing the supply of the powder 1 in the first cycle, and the hole The opening amount of the part 11a is held at a constant size x ₂ (x ₂ <x ₁ ), and the weight of the powder 1 in the powder container 2 received from the weight measuring unit 14 is a predetermined valve closing weight ω _2. At this time, the hole 11a is closed by the valve portion to supply the powder 1 into the powder container 2.

Hereinafter, the valve closing weight ω ₂ will be described with reference to the second line (x = x (t)) 17 and the third line 18 of FIG.

The valve closing weight ω ₂ is a value obtained by correcting the target weight ω _{d2 according} to a predetermined suspended powder amount ω _a2 .
The amount of suspended powder ω _a2 falls by its own weight from the hole 11a when the powder 1 is supplied into the powder container 2 by the control unit 15 as shown in the second line 17 and the third line 18 of FIG. The estimated weight of the powder 1 existing (floating) between the hole 11a and the powder container 2 when the flow rate of the powder 1 to be stabilized is stable. It is calculated based on the difference between the time integral of the opening amount x of the hole 11a while the flow rate of the powder 1 falling by its own weight from the portion 11a is stable and the measured value of the weight measuring unit 14 at that time.
The amount of suspended powder ω _a2 and the valve closing weight ω ₂ are specifically the values shown in the following [Equation 2].

However, in the above [Equation 3],
t ₄ indicates the time opening of the hole 11a is started,
_tw4 indicates the time when the measured value of the weight measuring unit 14 starts to increase after the hole 11a is opened,
t ₅ indicates the start time of the period during which the opening amount of the hole 11a is held in the predetermined size x _2,
t ₆ indicates the end time of the period during which the opening amount of the hole 11a is held in the predetermined size x _2,
x (t) represents the opening amount (valve opening amount) of the hole 11a,
S represents the time integral of x (t),
ΔS represents the amount of change in S per unit time,
Δω represents the amount of change in the measurement value ω of the weight measurement unit 14 per unit time,
t _wa is a time within a range of t _w5 <t _wa <t ₆ , that is, a time during which the flow rate of the powder 1 falling by its own weight from the hole 11a is stable,
β (t _wa ) indicates the value of β at time t _wa ,
S (t _wa ) represents a value when x (t) is integrated over time in the range of time t ₄ to t _wa ;
ω _f1 is a measured value of the weight measuring unit 14 between the time (t ₃ + t _L ) and (t _w4 ) shown in FIG. 3, and when the supply of the powder 1 is started (the second cycle is started). The measured value of the weight measuring unit 14 when the first cycle is completed, that is, the measured value of the weight measuring unit 14 when the first cycle is completed,
ω (t _wa ) indicates a measurement value of the weight measurement unit 14 at time t _wa .

As described above, the flow rate of the powder 1 that falls by its own weight from the hole 11a is measured in real time, and after the hole 11a is opened, the time for the opening amount of the hole 11a while the flow rate of the powder 1 is stable. The detection delay amount (floating powder amount ω _a2 ) of the weight measurement unit 14 is estimated from the relationship between the integration and the measured value of the weight measurement unit 14 at that time, and the timing for closing the hole 11a is configured earlier by that amount. ((Valve closing weight ω ₂ ) = (target weight ω _d2 ) − (floating powder amount ω _a2 )). As a result, the powder supply apparatus 100 can reduce the variation in weight with respect to the target weight ω _{d2 with} respect to the powder 1 supplied into the powder container 2, and can supply the powder 1 with high accuracy. Become.
In addition, the powder supply device 100 determines the timing for closing the hole 11 a with the weight of the powder 1 supplied into the powder container 2. Thereby, it is possible to reduce the weight variation of the powder 1 supplied into the powder container 2.
In addition, the powder supply apparatus 100 is not a wear-off system like the conventional powder supply apparatus 1000, but a system for managing the supply amount of the powder 1 by controlling the opening / closing of the hole 11a of the storage unit 11. Therefore, it is possible to suppress powder leakage.

  In this embodiment, the control unit 15 opens the hole 11a by the valve unit, maintains the opening amount of the hole 11a at a constant size, and further closes the hole 11a twice. Although it is configured to repeat, the cycle may be configured to be completed once, or may be configured to be repeated a plurality of times (two or more times). In this case, the target weight and the valve closing weight are set for each cycle. Further, the valve closing weight is calculated based on the above [Equation 1] or [Equation 2].

As shown in FIG. 4, when the control unit 15 repeats the cycle a plurality of times (i times), the control unit 15 performs the weight measurement unit 14 at the completion of the plurality of cycles (when the i-th cycle is completed). An error (difference and / or ratio) between the measured value ω _fiold and the target weight ω _di is stored, and the valve closing weight ω _iold is corrected based on the stored error (using the difference / ratio). May be. Specifically, the corrected valve closing weight ω _i is a value shown in the following [Equation 3].

  However, with respect to [Formula 3], the correction coefficient k is an arbitrary constant.

As described above, the control unit 15 _corrects the valve closing weight from ω _iold to ω _i based on the error between the measured value ω _fiold of the weight measuring unit 14 and the target weight ω _di , thereby supplying the next powder 1. From time (at the time of cutting), the timing for closing the hole 11a is changed when the measured value of the weight measuring unit 14 becomes the valve closing weight ω _i . Thereby, with respect to the powder 1 supplied into the powder container 2, it is possible to reduce the weight variation with respect to the target weight ω _di , and it is possible to supply the powder 1 with high accuracy.
In addition, the control unit 15 performs the above-described correction of the valve closing weight every time, so that the difference between the measured value of the weight measuring unit 14 and the target weight ω _di at the completion of a plurality of cycles (when the i-th cycle is completed) is obtained. It becomes possible to shrink, and it becomes possible to supply the powder 1 more accurately.

The solid line in FIG. 5 shows the case where the control unit 15 repeats the cycle twice (i = 2), and the first cycle and the second cycle are performed with the valve closing weight of the first cycle being ω _1old. A line indicating the relationship between the time t, the valve opening amount x, and the measured value ω of the weight measuring unit 14 is shown.
5 indicates that the valve closing weight of the first cycle is _changed from ω _1old to ω ₁ based on the error between the measured value of the weight measuring unit 14 and the target weight when the control unit 15 completes the second cycle. Correction is made (see [Formula 3] above), and the valve closing weight of the first cycle is set to ω _1, and the time t, the valve opening amount x, and the weight measuring unit 14 when the first cycle and the second cycle are performed. Represents a line indicating the relationship with the measured value ω.

  Also, as shown in FIGS. 6 and 7, the control unit 15 opens the hole when the valve unit holds the opening amount x of the hole 11a at a constant size when the cycle is repeated a plurality of times. The amount x may be adjusted stepwise for each of the plurality of cycles, and the opening amount x of the hole may be reduced as the number of cycles increases. As described above, the powder 1 has a large weight variation but can supply the powder 1 at a high speed (the opening amount x of the hole 11a is large), and the powder 1 is supplied at a low speed but the powder 1 has a weight variation. The powder 1 can be supplied with high accuracy in a short time by combining with a method that is small and can supply the powder 1 with high accuracy (opening amount x small of the hole 11a).

DESCRIPTION OF SYMBOLS 1 Powder 2 Powder container 11 Storage part 11a Hole part 12 Rod part 12a Tapered part 13 Actuator 14 Weight measuring part 15 Control part 16 1st line 17 2nd line 18 3rd line 100 Powder supply apparatus

Claims (10)

A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
When the powder is supplied into the powder container by the control unit, the amount of the suspended powder is stable when the flow rate of the powder falling by its own weight from the hole after the hole is opened is stabilized. Calculated based on the flow velocity of the powder at the time, or the time integration of the opening amount of the hole while the flow rate of the powder falling by its own weight from the hole is stable, and at that time The powder supply apparatus calculated based on the difference with the measured value of the said weight measurement part. A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
When the powder is supplied into the powder container by the control unit, the amount of the suspended powder is stable when the flow rate of the powder falling by its own weight from the hole after the hole is opened is stabilized. powder supplying device which is calculated based on the flow rate of the powder when being. A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
The floating powder quantity, in the case where the powder by the control unit is supplied to the powder in the container, after opening of the hole, the flow rate of the powder to be free-fall before Kiana unit stable The powder supply apparatus calculated based on the difference between the time integration of the opening amount of the hole during the period and the measured value of the weight measurement unit at that time. A powder supply device for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit,
The valve portion is moved upward and comes into contact with the peripheral portion of the hole portion, thereby eliminating the gap between the valve portion and closing the hole portion, and being moved downward and between the hole portion. By generating a gap, the hole is opened,
The control unit opens the hole by the valve unit, holds the opening amount of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole by the valve when the weight reaches a predetermined valve closing weight,
The valve closes by weight, the target weight is I corrected value der in accordance with a predetermined floating amount of powder, with the values shown in the following [Equation 1], the floating powder quantity, the control When the powder is supplied into the powder container by the part, the flow rate of the powder when the flow rate fluctuation of the powder falling by its own weight from the hole is stable after the opening of the hole Ru is calculated as a value in the following Expression 1 on the basis of,
Or
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder, and is a value represented by the following [Equation 2]. In the case where the powder is supplied into the powder container by the above, after the opening of the hole, the opening amount of the hole while the flow rate of the powder falling by its own weight from the hole is stable. The powder supply apparatus calculated so that it may become the value shown in the following [Equation 2] based on the difference of time integration and the measured value of the said weight measurement part at that time.

However, regarding the above [Equation 1],
t ₀ indicates the time when the opening of the hole starts,
t _w0 indicates the time when the measured value of the weight measuring unit starts to increase after the opening of the hole,
t ₁ indicates a start time of a period in which the opening amount of the hole is held at the constant size;
t ₂ represents the end time of the period during which the opening amount of the hole is held in the predetermined size,
t _w2 and t _w3 are times within the range of t _w1 <t _w2 <t _w3 <t ₂ + t _L ,
ω (t _w2 ) represents the measurement value of the weight measurement unit at time t _w2 ,
ω (t _w3 ) indicates a measurement value of the weight measurement unit at time t _w3 .

However, in [Formula 2],
t ₄ indicates the time when the opening of the hole starts,
t _w4 indicates the time when the measurement value of the weight measurement unit starts to increase after the opening of the hole,
t ₅ represents the start time of a period in which the opening amount of the hole is held at the constant size;
t ₆ indicates the end time of the period during which the opening amount of the hole is held in the predetermined size,
x (t) represents the opening amount of the hole,
S represents the time integral of x (t),
ΔS represents the amount of change in S per unit time,
Δω indicates the amount of change in the measurement value of the weight measurement unit per unit time,
t _wa is a time in the range of t _w5 <t _wa <t ₆ ,
β (t _wa ) indicates the value of β at time t _wa ,
S (t _wa ) represents a value when x (t) is integrated over time in the range of time t ₄ to t _wa ;
ω _f indicates the measurement value of the weight measurement unit when the supply of the powder is started,
ω (t _wa ) indicates the measurement value of the weight measurement unit at time t _wa . Before Symbol floating powder quantity and the valve closes weight becomes the value shown in the following [Equation 1], the powder supply device according to claim 2.

However, regarding the above [Equation 1],
t ₀ indicates the time when the opening of the hole starts,
t _w0 indicates the time when the measured value of the weight measuring unit starts to increase after the opening of the hole,
t ₁ indicates a start time of a period in which the opening amount of the hole is held at the constant size;
t ₂ represents the end time of the period during which the opening amount of the hole is held in the predetermined size,
t _w2 and t _w3 are times within the range of t _w1 <t _w2 <t _w3 <t ₂ + t _L ,
ω (t _w2 ) represents the measurement value of the weight measurement unit at time t _w2 ,
ω (t _w3 ) indicates a measurement value of the weight measurement unit at time t _w3 . Before Symbol floating powder quantity and the valve closes weight becomes the value shown in the following [Equation 2], the powder supply device according to claim 3.

However, in [Formula 2],
t ₄ indicates the time when the opening of the hole starts,
t _w4 indicates the time when the measurement value of the weight measurement unit starts to increase after the opening of the hole,
t ₅ represents the start time of a period in which the opening amount of the hole is held at the constant size;
t ₆ indicates the end time of the period during which the opening amount of the hole is held in the predetermined size,
x (t) represents the opening amount of the hole,
S represents the time integral of x (t),
ΔS represents the amount of change in S per unit time,
Δω indicates the amount of change in the measurement value of the weight measurement unit per unit time,
t _wa is a time in the range of t _w5 <t _wa <t ₆ ,
β (t _wa ) indicates the value of β at time t _wa ,
S (t _wa ) represents a value when x (t) is integrated over time in the range of time t ₄ to t _wa ;
ω _f indicates the measurement value of the weight measurement unit when the supply of the powder is started,
ω (t _wa ) indicates the measurement value of the weight measurement unit at time t _wa . The control part opens the hole part by the valve part, maintains the opening amount of the hole part at a constant size, and further closes the hole part as one cycle. By repeating, the powder is supplied into the powder container,
The powder supply apparatus according to any one of claims 1 to 6, wherein the target weight and the valve closing weight are set for each of the plurality of cycles.   The said control part memorize | stores the error of the measured value of the said weight measurement part and the said target weight at the time of completion of these cycles, and correct | amends the said valve closing weight based on the memorize | stored error. Powder supply equipment.   8. The control unit according to claim 7, wherein the opening amount of the hole portion when the opening amount of the hole portion is held at a constant size by the valve portion can be adjusted step by step for each of the plurality of cycles. Powder supply equipment. A powder supply method for supplying powder of a predetermined target weight into a powder container,
An accommodation space capable of accommodating the powder is formed, a hole portion through which the powder in the accommodation space can flow out is formed, and the hole portion is disposed above the powder container. A containment section;
The hole of the container can be opened / closed, and by opening the hole, the powder in the container space is dropped by its own weight from the hole and supplied into the powder container. A valve part that blocks the powder in the accommodation space from flowing out of the hole by closing
A weight measuring unit for measuring the weight of the powder in the powder container;
A control unit connected to the valve unit and the weight measurement unit ,
The valve portion is moved upward and comes into contact with the peripheral edge portion of the hole portion, thereby eliminating the gap between the hole portion and closing the hole portion, and moving downward and between the hole portion. By using a powder supply device that opens the hole by generating a gap ,
The control unit causes the valve unit to open the hole, holds the opening of the hole at a constant size, and further receives the powder in the powder container received from the weight measuring unit. Supplying the powder into the powder container by closing the hole in the valve when the weight reaches a predetermined valve closing weight;
The valve closing weight is a value obtained by correcting the target weight according to a predetermined amount of suspended powder,
When the powder is supplied into the powder container by the control unit, the amount of the suspended powder is stable when the flow rate of the powder falling by its own weight from the hole after the hole is opened is stabilized. Calculated based on the flow velocity of the powder at the time, or the time integration of the opening amount of the hole while the flow rate of the powder falling by its own weight from the hole is stable, and at that time The powder supply method calculated based on the difference with the measured value of the said weight measurement part.

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