JP2000001224A - Powder and grain throw-in device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent scattering of powder and grain to peripheral environment without collecting the powder and grain with a dust collector as much as possible when air of a throwing part is smoothly discharged (air is replaced the powder and grain) in the case where the powder and grain is thrown in the throwing part. SOLUTION: In a powder and grain throw-in device 10, an air replacement port is formed in a throwing port cover 36 provided on a powder and grain throwing path 12 which is connected to a powder and grain supplying container 11, and a bag filter 62 is provided on the air replacement port. Furthermore, the outside of the bag filter 62 is covered with a dust collection hood 67 connected to a dust collector, and a clearance for accepting an outside air is provided between the dust collecting hood 67 and the bag filter 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transferring powders, granules, powders, granules, powders and the like (hereinafter collectively referred to as powders) from a powder and granules supply section such as a container or a hopper. The present invention relates to a granular material charging device for charging (loading and transferring) into a granular material charging section which is a closed space such as a container, a carton, and a bag.

[0002]

2. Description of the Related Art Conventionally, as a powder and granular material feeding device, a patent 2660
As described in Japanese Patent Publication No. 305, an inlet cover provided in a powder-particle supply passage connected to a powder-particle supply unit (container) is connected to the powder-particle input unit (container), and the powder-particle supply unit is connected to the supply port cover. Is opened by a valve opening / closing device so that the granules in the granule supply section can be fed from the granule introduction path to the granule introduction section.

[0003] In this conventional technique, the space between the powder-particle input passage and the powder-particle input section is closed by an input port cover, thereby preventing generation of dust around the powder-particle input section.

[0004]

However, the prior art has the following problems. When the space between the powder-particle input passage and the powder-particle input section is closed by the input port cover, the discharge of air in the input section when the powder is injected into the powder-particle input section (the powder and the air). Replace with)
Is not carried out smoothly, which impairs the smooth introduction of the granular material.

[0005] In the case where the supply valve moves up and down in parallel with the supply port of the powder supply section to open and close the supply port, the pulsation of air accompanying the opening and closing of the valve causes the powder supply path to be opened. As a result, the negative pressure and the pressurization are repeatedly applied to the granular material input section, and the granular material input section may be deformed or damaged.

[0006] In Japanese Utility Model Laid-Open No. 1-111628, a dust collecting device is connected to a sealed powder material feeding path (chute) extending from a powder material supply part (silo) to a powder material charging part (lorry vehicle). Then, the dust collection device surely discharges (replaces) air required when the granular material is charged into the granular material charging section. However, in Japanese Utility Model Laid-Open Publication No. 1-111628, a part of the granular material to be charged into the granular material charging section is always sucked toward the dust collecting device, resulting in loss of the granular material. This loss of the granules is a fatal problem in terms of production cost, especially in high value-added granules such as medicines and foods.

[0007] In Japanese Utility Model Registration No. 2541569, a dust collection pipe is connected to a closed powder material feeding path (chute) extending from a powder material supplying part (hopper) to a powder material charging part (tank). The dust collection pipe is connected to the side of the powder supply unit, and the collected powder is finally collected in the powder supply unit. However, in the actual registration No. 2541569, part of the granules once discharged from the granule supply section is not fed into the granule input section, but is moved from the dust collection pipe to the side of the granule supply section. It is a configuration that circulates and returns, and in order to avoid blending of the granular material in the granular material supply unit, only one type of granular material can be handled. Therefore, in the case of handling various kinds of granules or high value-added granules such as medicines and foods that require thorough management of quality, weight, etc. for each production lot, such an apparatus is used. Cannot be adopted.

An object of the present invention is to smoothly discharge air (replacement of powder and granules) from the charging section when the powder and granules are charged into the charging section. An object of the present invention is to prevent dust from scattering to the surrounding environment while minimizing dust collection by a dust collector.

[0009]

According to the first aspect of the present invention, an inlet cover provided in a granular material supply path connected to a granular material supply unit is directly or indirectly connected to the granular material charging unit. Connected, the input valve of the powder supply unit is opened by a valve opening / closing device, and the powder in the powder supply unit can be supplied to the powder input unit from the powder input path in the powder input device. Forming an air displacement port in the inlet cover, providing a filter in the air displacement port, covering the outside of the filter with a dust collecting hood connected to a dust collecting device, and removing outside air between the dust collecting hood and the filter. An input gap is provided.

The term "directly or indirectly connecting the charging port cover to the granular material charging section" means that the charging port cover is directly connected to the granular material charging section without any intervening intermediate material, This means that the cover may be indirectly connected to the granular material charging section via an intermediate inclusion, for example, a cushion hopper, a charging chute, a bag sealing device, or the like.

According to a second aspect of the present invention, in the first aspect of the present invention, a static pressure gauge for detecting a static pressure in the dust collecting hood and a height of the dust collecting hood are adjusted. , A dust collecting hood height adjustment device that adjusts the gap between the dust collecting hood and the filter for taking in outside air, and a device that collects the static pressure in the dust collecting hood so that the static pressure in the dust collecting hood becomes a constant value based on the detection result of the static pressure gauge. And a control device for driving and controlling the dust hood height adjusting device.

According to a third aspect of the present invention, in the first or second aspect of the present invention, there is further provided a static pressure gauge for detecting a static pressure in the dust collecting hood, and a filter for collecting dust collected by the filter. It has a filter backwashing device that peels inward and a control device that activates the filter backwashing device when the detection result of the static pressure gauge is obtained and the static pressure in the dust collection hood becomes a certain value or less. It is to become.

The present invention described in claim 4 is the first to third aspects of the present invention.
In the present invention according to any one of the above, further, a level meter for detecting the granular material charging level of the granular material charging portion, a detection result of the level meter is obtained, and the charging level of the granular material charging portion is a full level. And a control device for controlling the drive of the valve opening / closing device so as to close the injection valve when the pressure reaches the threshold value.

The present invention described in claim 5 provides the invention according to claims 1-4.
In the present invention according to any one of the above, the supply valve can be opened and closed by vertically moving the supply valve in parallel with the supply port of the granular material supply section.

The present invention described in claim 6 provides the invention according to claims 1 to 5
In the present invention described in any one of the above, further, the filter has an aperture of 5 to 20 μm.

[0016]

According to the first aspect of the present invention, the following operations are provided. Since there is a gap for taking in outside air between the filter and the dust collecting hood that covers the filter, the closed space of the granule charging section and the outside air communicate with each other through the filter, and the granules are charged. The discharge (replacement) of the air in the charging section when the charging section is charged into the section can be smoothly performed, and the granular material can be smoothly charged. Also, even if the pulsation of air accompanying the opening and closing of the valve is added to the closed space of the granular material charging section via the granular material charging path,
There is no sudden large negative pressure or pressure acting on the closed space of the charging section, and no deformation or breakage occurs in the charging section.

Dust in the powder input section and the powder input path is collected by a dust collector, stopped by the filter by the filter, and only a small amount of dust passing through the filter is transferred from the dust collecting hood to the dust collector. , The loss of powder and granules is small, and there are cases where various kinds of powders are handled or when it is necessary to thoroughly control each production lot. Can be adopted effectively. At the same time, scattering of the granules into the surrounding environment is prevented. In addition, the present device does not force the dust to be collected by the dust collecting device, and the capability of the dust collecting device may be small. In addition, it is not necessary to suck all the dust generated by the dust collection duct hose as in the past, the flow of dust through the duct hose is extremely low, there is no abrasion or blockage of the duct hose, and maintenance is extremely easy. It is.

According to the second aspect of the present invention, the following operations are provided. Since the gap for taking in outside air between the filter and the dust collecting hood that covers the filter, that is, the height of the dust collecting hood is adjusted so that the static pressure in the dust collecting hood becomes a constant value, the powder and granular materials are charged. The sealed space of the part does not become large negative pressure or pressurized state.

When the filter is slightly clogged, the dust collecting hood rises to increase the amount of outside air sucked, the suction force acting on the filter is adjusted, and the filter does not clog up rapidly. . That is, although the air in the powder-particle input section is exhausted (replaced) for the input of the powder, the amount of the exhaust is not made excessive and the filter is prevented from being clogged earlier.

According to the third aspect of the present invention, the following operations are provided. When the static pressure in the dust collecting hood becomes equal to or less than a certain value, the filter backwashing device is operated, and the collected dust of the filter is separated toward the inside of the filter, so that clogging can be eliminated. Even by this operation, the granular material can be effectively collected.

According to the present invention, there is provided the following operation. When the enclosed space of the granular material charging section is filled with the granular material, the level meter detects the granular material and closes the charging valve. Therefore, if a weighing device is provided in the powder supply unit or the powder input unit to control the amount of powder input, this level meter may be used as a safety device in the event of a failure of the weighing device or an excessive input. It functions as a prevention device. When a weighing device is not provided, this level meter functions as a device for detecting the completion of charging of the granular material.

According to the present invention, the following effects are obtained. The charging valve opens and closes the supply port of the granular material supply unit by moving vertically in parallel with the supply port.

According to the sixth aspect of the present invention, the following operations are provided. By setting the opening of the filter to 5 to 20 μm, it is possible to reduce the collection rate, reduce the weight, and reduce the cost, without making the filter fine as in a normal dust collector.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing a granular material charging device according to a first embodiment, FIG. 2 is a schematic diagram showing a charging valve, FIG. 3 is a schematic diagram showing a weighing device, and FIG. FIG. 5 is a schematic diagram showing the device, FIG. 5 is a schematic diagram showing a dust collecting hood and a bag filter,
FIG. 6 is a schematic diagram showing a dust collecting hood height adjusting device, FIG. 7 is a schematic diagram showing a bag filter backwashing device, FIG. 8 is a schematic diagram showing a control device, and FIG. FIG. 10 is a schematic view showing a dust-collecting hood and a bag filter, and FIG. 12 is a schematic view showing a dust-collecting hood and a bag filter. FIG. 13 is a schematic diagram showing a filter backwashing device, and FIG. 14 is a schematic diagram showing a control device.

(First Embodiment) (FIGS. 1 to 8) As shown in FIG. 1, a powder material feeding device 10 is provided in a powder material feeding path 12 connected to a powder material supply container 11, as will be described later. The injecting port cover 36 to be connected is indirectly connected to the granular material charging bag 14, the charging valve 15 of the granular material supply container 11 is opened by the valve opening / closing device 16, and the granular material 1 in the container 11 is moved to the granular material charging path. The bag 12 can be put into the bag 14.

And, in the granular material input device 10,
The weight of the granular material 1 placed in the bag 14 is measured by the weighing device 17, and the granular material 1 having a set weight can be placed in the bag 14.

Hereinafter, the configuration of each part of the granular material charging device 10 will be described. (Powder / Particle Supply Container) (FIG. 2) As shown in FIG. 2, the powder / particle supply container 11 has a leg skirt 22 attached to the outer periphery of the lower part of the container main body 21, and the above-described supply port 21 </ b> A of the container main body 21. A charging valve 15 is provided. The charging valve 15 has a conical shape, and is capable of opening and closing the supply port 21A by vertically moving parallel to the supply port 21A in the granular material of the container 11.

(Powder / Particle Feeding Path) (FIG. 1) The powder / particle feeding apparatus 10 includes a support plate 32
Are provided at the upper four corners of the support plate 32.
The leg skirt 22 of the container 11 can be inserted and guided between the guide legs 33. Then, in a state where the leg skirt 22 of the container 11 is guided by the guide legs 33 and supported on the support plate 32, the container body 21
The powder material supply path 12 is located immediately below the supply port 21A.

The powder material supply path 12 includes an upper chute 34 connected to the support plate 32, a lower chute 35 connected to the upper chute 34, an input cover 36 connected to the lower chute 35, and an input cover 36. It has a cushion hopper 37 to be connected. The upper chute 34 and the lower chute 35 are, for example, a flange joint, and the lower chute 35
And the inlet cover 36 are, for example, welded joints, the inlet cover 3
The cushion hopper 6 and the cushion hopper 37 are joined by, for example, a clamp joint or a bolt nut joint (not shown). In the example shown in FIG. 5, the charging port cover 36 and the cushion hopper 37 are made of a sealing material 36A such as a silicone sponge adhered to the lower surface of the charging port cover 36, and a silicone rubber or the like inserted into the opening edge of the cushion hopper 37. Are connected via a close contact portion with the sealing material 37A.

The powder material feeding path 12 has a charging chute 39 connected to a cushion hopper 37 via a flexible joint 38, and the charging chute 39 is supported by the weighing device 17 via a support column 53 described later. It has become so.

(Valve Opening / Closing Device) (FIG. 2) The valve opening / closing device 16 is mounted inside the upper part of the upper chute 34 via a stay 41 (FIG. 2). The valve opening / closing device 16 includes a conical operating portion 43 attached to a piston rod of a cylinder device (not shown) disposed inside the bellows portion 42.
It is attached. The valve opening / closing device 16 opens the supply valve 15 by the upward movement operation of the operating portion 43 by the cylinder device, and drops and supplies the granular material 1 to the granular material introduction path 12. The valve opening / closing device 16 moves the operating portion 43 up and down to prevent blockage during the supply of the granular material 1 so as to prevent the closing of the charging valve 1.
5 is moved up and down. The valve opening / closing device 16 operates the closing valve 1 by moving the operating unit 43 downward by the cylinder device.
5 is closed to stop the supply of the granular material 1.

(Weighing device) (FIGS. 3 and 4) The granular material charging device 10 has a weighing device 17 such as a load cell or an electronic balance, and conveys the granular material charging bag 14 as shown in FIG. A portion of the conveyor 51 (guide bar 52) located in the powder material input area is used as a weighing surface of the weighing device 17,
The weight of the granular material 1 put in the bag 14 by the gain-in-weight method can be measured.

Then, the powder material input device 10 includes the weighing device 1
A column 53 is set up on the side of 7, and a bag sealing device 54 is provided on the column 53. The bag sealing device 54 is provided with a pair of front and rear pressing devices 56 on a support fitting 55 attached to a support column 53, and a silicone sponge adhered to a sealing material mounting frame 57 provided on, for example, a piston rod of a cylinder device constituting the pressing device 56. The opening of the granular material charging bag 14 is sandwiched between the outer surfaces of the discharge ports 39A of the charging chute 39 by a sealing material 58 such as the above. At this time, the sealing material 5 of the bag sealing device 54
As shown in FIG. 4, the input chute 3 is elastically deformed so as to be in close contact with the outer surface of the discharge port 39A of the input chute 39 with the opening of the bag 14 interposed therebetween, and the input chute 3 is almost completely sealed.
9 can be inserted.

Incidentally, of the powder material feeding path 12, those above the cushion hopper 37 are supported by the support plate 32, and the charging chute 39, the column 53, and the bag sealing device 54 are provided.
Weight is not transmitted to the side of the cushion hopper 37 due to the presence of the flexible joint 38, but is all applied to the weighing device 17.

(Bag Filter and Dust Collection Hood) (FIG. 5) As shown in FIG. 5, the powder material input device 10 forms an air replacement port 61 in the input port cover 36 of the powder material input path 12, and the air A bag filter 6 corresponding to the filter of the present invention is provided in the replacement port 61.
2 is fixed by a filter clamp 63. When selecting the bag filter 62 having an appropriate air permeability in consideration of the particle size distribution of the granular material to be handled, the granular material charging device 10 seals the granular material charging path 12 and the granular material charging bag 14. Dust in the space is collected, and most of the dust is retained in the bag 14 by the bag filter 62, and only a small amount of dust that has passed through the bag filter 62 is transferred from the dust collection hood 67, which will be described later, to the dust collection device 6.
Only at the side of No. 4 there is little loss of powder. Specifically, it is preferable to use a bag filter having a mesh size of 5 to 20 μm.

Further, as shown in FIG. 5, the powder material feeding device 10 includes a duct hose 65 connected to a dust collecting device 64.
To the dust collecting hood 67 by a hose clamp 66,
The outside of the bag filter 62 is covered with the dust collecting hood 67,
Further, a gap H for taking in outside air is provided between the dust collecting hood 67 and the bag filter 62.

(Dust Collection Hood Height Adjustment Apparatus) (FIG. 6) As shown in FIG.
By adjusting the height of the static pressure gauge 68 for detecting the static pressure in the inside 7 and the height of the dust collecting hood 67, the dust collecting hood height for adjusting the gap H for taking in the outside air between the dust collecting hood 67 and the bag filter 62 is adjusted. The dust collecting hood height adjusting device 69 can be driven and controlled such that the static pressure in the dust collecting hood 67 becomes a constant value. The dust collecting hood height adjusting device 69 is configured by an electric or pneumatic cylinder device (not shown) supported by the input port cover 36, and attaches the elevating element 70 attached to the piston rod of the cylinder device to the dust collecting hood 67. In addition, the lift 70 is moved up and down along a height adjustment guide 71 supported by the inlet cover 36, so that the height of the dust collection hood 67 can be adjusted. In FIG. 6, 68
A is a static pressure detection tube.

(Filter Backwashing Apparatus) (FIG. 7) As shown in FIG. 7, the granular material charging apparatus 10 is provided with a filter backwashing apparatus 72 for separating dust collected by the bag filter 62 toward the inside of the bag filter 62. have. The filter backwashing device 72 is configured by attaching a plurality of cleaning nozzles 73 that blow compressed air instantaneously to a dust collecting hood 67 around the bag filter 62, and the static pressure in the dust collecting hood 67 has a constant value. When the following occurs, the bag filter 62 is backwashed.

(Control Device) (FIG. 8) The control device 74 of the powder material feeding device 10 is constituted by a PLC (programmable controller), a solenoid valve, a pneumatic device, and the like. Is transferred, the injection valve 15 (valve opening / closing device 16), the bag sealing device 5
4. The driving of the dust collecting device 64, the dust collecting hood height adjusting device 69 and the bag filter backwashing device 72 is controlled as follows.

(A) Normal operation mode (1) The operator sets the bag 14 into the conveyor 51 above the weighing device 17 and turns on the operation button of the bag sealing device 54 provided in the control device 74. I do.

(2) The control device 74 operates (closes) the bag sealing device 54 in response to the ON operation signal of the bag sealing device 54 and starts suction by the dust collecting device 64.

(3) Subsequently, the control device 74 opens the charging valve 15 by the valve opening / closing device 16 and starts charging the powder 1 from the powder supply container 11 to the powder charging bag 14. In this case, the control device 74 controls opening and closing of the charging valve 15 by the valve opening / closing device 16 and driving control of the dust collecting device 64 in a charging operation mode described later.

(4) The controller 74 obtains the detection result of the weighing device 17 and closes the charging valve 15 by the valve opening / closing device 16 when the charging of the set weight of the granular material 1 is completed in the bag 14.

(5) A predetermined period of time (for example, 5 to 5 minutes) after the powder 1 of the set weight is completely charged into the powder granule charging bag 14 until the floating dust is eliminated in the powder granule charging path 12 and the bag 14. 10 seconds) with a timer, and then the bag sealing device 5
4 is opened and the bag 14 is released. At this time, all the dust in the bag 14 has settled, and no dust is generated.

(6) The bag 14 is carried out to the next step by the conveyor 51.

(B) The closing operation mode control device 74
In (3) of the normal operation mode (A), the opening / closing of the charging valve 15 by the valve opening / closing device 16 and the drive control of the dust collecting device 64 are performed as follows.

(1) Large-volume charging mode The measured weight of the granular material charged into the bag 14, which is the detection result of the weighing device 17, is a predetermined switching value (for example, 80 to 90% of the set weight).
The intermittent supply (for example, intermittent supply with 2 seconds open and 4 seconds closed) in which the input valve 15 is opened intermittently (relatively long open time) until the pressure reaches The valve opening / closing device 16 is controlled so as to perform the supply, and the dust collecting device 64 is controlled so as to collect the dust in the powder material charging passage 12.

(2) Small-quantity feeding mode After the detection result of the weighing device 17 reaches the above-mentioned switching value,
From intermittent supply in which the injection valve 15 is opened intermittently with a shorter opening time than before reaching the switching value (for example, intermittent supply in 0.5 seconds, closed in 5 seconds) or continuous supply in which the injection valve 15 is continuously opened. The valve opening / closing device 16 is controlled so as to perform intermittent supply that is switched to open intermittently (for example, intermittent supply for 0.5 second opening and 6 second closing), and also stops dust collection in the powder material charging passage 12. The dust collector 64 is controlled.
That is, in the small-amount feeding mode, the dust collecting force of the dust collecting device 64 causes a measurement error of several tens g to several hundreds g, so that the dust collection is stopped. Also at this time, the bag filter 62 prevents the generation of dust to the outside.

That is, in the small-quantity feeding mode, the controller 74
Is a start time (for example, at least 3 to 5 seconds) that takes into account the stabilization time of the weighing device 17 after the short-time opening of the charging valve 15 to perform the small-volume charging operation and determine whether the next small-volume charging operation is necessary.
Only the closing valve 15 is closed and the apparatus stands by. After the standby, it is determined from the detection result of the weighing device 17 whether or not the set weight has been reached. If the set weight has not been reached, the input valve 15 is opened once more for a short time to perform a small-quantity input operation, and the apparatus stands by again. In this way, until the detection result of the weighing device 17 reaches the set weight, the small amount charging operation for intermittently opening and closing the charging valve 15 is repeated (intermittent supply).

In the small-volume feeding mode, the controller 74
, The opening time of the charging valve 15 in the intermittent supply after reaching the above-mentioned switching value is gradually shortened as the measured weight of the weighing device 17 approaches the set weight.

In the small-quantity feeding mode, the controller 74
In addition, the closing time of the charging valve 15 in the intermittent supply after the switching value is reached is set longer than before the switching value is reached.
The closing time of 5 is zero). That is, in the small-amount supply mode, the closing time of the supply valve 15 in the intermittent supply after reaching the above-described switching value is lengthened, and the supplied granular material in the granular material supply path 12 finishes falling. To do. If this time is 3 to 10 seconds, most of the suspended particles will settle, so this time may be practical.
This improves weighing accuracy.

(C) Dust collection hood height adjustment mode The controller 74 obtains the detection result of the static pressure gauge 68 and adjusts the dust collection hood height so that the static pressure in the dust collection hood 67 becomes a constant value. The drive of the device 69 is controlled to adjust the outside air intake gap H between the dust collecting hood 67 and the bag filter 62.

(D) Bag filter backwash mode The controller 74 detects the detection result of the static pressure gauge 68 even if the height of the dust collecting hood 67 is adjusted by the dust collecting hood height adjusting device 69 due to the clogging of the bag filter 62. When the static pressure in the dust collecting hood 67 becomes equal to or lower than a predetermined value, such as when the static pressure does not rise to a predetermined static pressure, the bag filter backwashing device 72 is operated, and compressed air is discharged from the nozzle 73 to the outside of the bag filter 62 by a predetermined amount. Spraying the bag filter 62 for a time (for example, 1 to 2 seconds) causes the collected dust of the bag filter 62 to be peeled toward the inside of the bag filter 62, thereby eliminating the clogging of the bag filter 62.

When the bag filter 62 is backwashed, the charging valve 15 is raised (opened) by the valve opening / closing device 16 so that the bag 14 and the like are not pressurized, so that the powder material feeding passage 12 and the bag 14 are moved. It is preferable to synchronize when there is a tendency that the pressure inside the powdered material input system is negative (the outside air flows into the powdered material input system via the bag filter 62).

Therefore, the powder and granular material feeding apparatus 10 of the present embodiment is
According to this, the following effects are obtained. Since there is a gap H for taking in outside air between the bag filter 62 and the dust collecting hood 67 that covers the bag filter 62, a state is established in which the closed space of the bag 14 is communicated with the outside air through the bag filter 62. When the granules are charged into the powder bag 14, the air in the charging bag 14 is smoothly discharged (replaced), and the powder particles can be smoothly charged. Further, even if the pulsation of air accompanying the opening and closing of the valve 15 is applied to the closed space of the powder bag 14 through the powder inlet path 12, a large negative pressure or pressure is suddenly applied to the closed space of the bag 14. No pressure is applied, and the input bag 14 is not deformed or damaged.

Dust in the powder bag 14 or the powder passage 12 is collected by a dust collector 64 and is filtered by a bag filter 62.
The small dust that has been stopped by the charging bag 14 and passed through the bag filter 62 is removed from the dust collecting hood 67 by the dust collecting device 6.
4 and the loss of powder is small, and high value-added powders such as medicines and foods occur when handling various kinds of powders or when it is necessary to thoroughly control each production lot. Can be adopted effectively. At the same time, scattering of the granules into the surrounding environment is prevented. In addition, the present device does not force the dust to be collected by the dust collecting device, and the capability of the dust collecting device may be small. Further, it is not necessary to suck all the dust generated by the dust collection duct hose 65 as in the conventional case, and the flow of the dust passing through the duct hose 65 is extremely low. Is extremely easy.

The bag filter 62 and the dust collecting hood 67 that covers the bag filter 62 so that the static pressure in the dust collecting hood 67 becomes constant.
Is adjusted, that is, the height of the dust collecting hood 67 is adjusted, so that the closed space of the bag 14 is not subjected to a large negative pressure or pressurized state.

When the bag filter 62 is slightly clogged, the dust collecting hood 67 rises to increase the amount of outside air sucked, the suction force acting on the bag filter 62 is adjusted, and the bag filter 62 is clogged. Does not progress rapidly. That is, although the air in the bag 14 is exhausted (replaced) for the introduction of the granules, the amount of the exhaust is not made excessive and the clogging of the bag filter 62 is accelerated. To avoid.

When the static pressure in the dust collecting hood 67 becomes equal to or less than a predetermined value, the bag filter backwashing device 72 is operated, and the collected dust of the bag filter 62 is separated toward the inside of the bag filter 62, and the bag filter 62 is clogged. Can be eliminated. Even by this operation, the granular material can be effectively collected.

The charging valve 15 is used for supplying the granular material supply container 1.
The supply port 21A is opened and closed by moving up and down with respect to one supply port 21A.

The opening of the bag filter 62 is set to 5 to 20 μm.
By doing so, it is possible to reduce the collection rate, to reduce the weight, and to reduce the cost, without using a fine dust collector as in a normal dust collector.

Further, according to the method for charging a granular material of the present embodiment, the following effects are obtained. Until the measured weight of the granular material reaches the switching value, in the large-volume charging mode, the charging valve 15 is opened intermittently with a relatively long opening time or continuously opened to increase the charging speed. The dust in the granule charging path 12 is collected, and the air in the granule charging bag 14 is exhausted.
4 facilitates replacement of the air and the granular material, and facilitates the charging of the granular material, and as a result, shortens the charging time.

After the measured weight of the powder or granule has reached the switching value, the charging valve 15 is intermittently opened in a relatively short opening time to improve the weighing accuracy in the small-volume charging mode. The collection of dust in the charging path 12 is stopped to prevent the deterioration of the measurement accuracy due to the floating of the granular material due to the dust collection force, thereby improving the measurement accuracy.

Since the opening time of the charging valve 15 in the intermittent supply after the measured weight of the granular material reaches the switching value is gradually shortened as the measured weight approaches the set weight, the charging amount per unit time is initially reduced. In many cases, as the weight approaches the set weight, the amount per unit time is reduced, so that the measuring accuracy is improved and the time required for charging the granules can be shortened as a whole.

Since the closing time of the charging valve in the intermittent supply after the measured weight of the granular material reaches the switching value is longer than before the switching value is reached, the granular material in the granular material charging path 12 is always The weight of the granular material can be measured in a state where it has been dropped (settled) on the granular material charging bag 14, and the measuring accuracy is improved.

(Second Embodiment) (FIG. 9) As shown in FIG. 9, the powder material input device 10 of the second embodiment is substantially different from the powder material input device 10 of the first embodiment. As a method for measuring the weight of the granular material 1 charged into the granular material charging bag 14, a loss-in-weight method has been adopted.

That is, the granular material feeding device 10 of the second embodiment
In the following, the support plate 32 and the gantry 31 of the granular material input path 12 on which the leg skirt 22 of the granular material supply container 11 is mounted are mounted.
In between, a weighing device 81 similar to the weighing device 17 is provided, a flexible joint 82 is provided between the upper chute 34 connected to the support plate 32 and the inlet cover 36, and the weight of the member below the inlet cover 36 is reduced. Is not applied to the flexible joint 82 by supporting it on the side of the gantry 31 (therefore, it is not applied to the weighing device 81).

A cushion hopper 37 is connected to the charging port cover 36, a charging chute 39 is connected to the cushion hopper 37, and the discharge port 3 of the charging chute 39 is connected to the cushion hopper 37.
The point that the opening of the charging bag 14 is attached to 9A in a sealed state by the bag sealing device 54 is the same as in the first embodiment. Further, the configuration and operation of the other parts are not different from those of the first embodiment, and the same reference numerals are used and the description is omitted.

(Third Embodiment) (FIGS. 10 to 14) As shown in FIG. 10, a powder material feeding device 110 is connected to a powder material supply container 11 similar to that in the first embodiment. An inlet cover 136 described later provided in the body introduction path 112 is directly connected to the granular material introduction container 114, and the introduction valve 15 of the granular material supply container 11 is opened by the valve opening / closing device 116, and the particles in the container 11 are opened. The body 1 can be charged into the container 114 from the powdery material charging path 112. In this embodiment, the same container as the granular material supply container 11 is used as the granular material supply container 114.

Then, in the granular material feeding device 110, the weight of the granular material 1 charged into the container 114 is measured by the weighing device 117, and the set weight of the granular material 1 is transferred to the container 11.
4 can be used.

Hereinafter, the configuration of each part of the granular material charging device 110 will be described. (Powder / Particle Injection Path) (FIGS. 10, 11, and 12) The powder / particles introduction apparatus 110 supports the support plate 132 on the gantry 131 via the weighing device 117, and the support plate 13
2 are provided with guide legs 133 at the upper four corners.
The leg skirt 22 of the container 11 can be inserted between 33 and guided. Then, in a state where the leg skirt 22 of the container 11 is guided by the guide legs 133 and supported on the support plate 132, the powder material introduction path 112 is located immediately below the supply port 21A of the container body 21. I have.

The powder material input passage 112 is provided on the support plate 13.
2 and the upper chute 134 connected to the upper chute 13
4 has an inlet cover 136 connected via a flexible joint 135. For example, the upper chute 134 and the flexible joint 135 are flange-joined, and the flexible joint 135 and the inlet cover 136 are clamp-joined using, for example, a hose clamp 137 (FIG. 11).

At this time, as shown in FIG.
A cover elevating cylinder 138 is supported at a lower portion of the opening 136. The cover elevating cylinders 138 are arranged in pairs at symmetric positions on both sides of the inlet cover 136, and the inlet cover 136 is attached to and detached from the opening of the inlet container 114. The opening of the charging port cover 136 and the charging container 114 is formed by a sealing material 136A such as a silicone sponge adhered to the lower surface of the charging port cover 136 and a sealing material 114A such as silicon rubber inserted into the opening of the charging container 114. They are connected via a contact portion.

(Valve Opening / Closing Device) (FIG. 10) The valve opening / closing device 116 is mounted inside the upper chute 134 via a stay 141. Like the valve opening / closing device 16 of the first embodiment, the valve opening / closing device 116 has a conical operating portion 143 attached to a piston rod of a cylinder device disposed inside a bellows portion (not shown). The valve opening / closing device 116 opens the supply valve 15 by the upward movement operation of the operating portion 143 by the cylinder device, and drops and supplies the granular material 1 to the granular material introduction path 112. Also,
The valve opening / closing device 116 moves the operating part 143 up and down during supply of the granular material 1 to prevent blockage, and
5 is moved up and down. And the valve opening / closing device 116
The supply valve 15 is closed by the lowering operation of the operating portion 143 by the cylinder device, and the supply of the granular material 1 is stopped.

(Weighing Device) (FIG. 10) The granule charging device 110 has a weighing device 117 such as a load cell or an electronic balance. The weight can be measured.

That is, in the granular material feeding device 110, as described above, the weighing device is provided between the support plate 132 and the gantry 131 of the granular material charging path 112 on which the leg skirt 22 of the granular material supply container 11 is mounted. 117 and the support plate 13
2 and the upper chute 134 and the inlet cover 13
6, a flexible joint 135 is provided so that the weight of the members below the inlet cover 136 is not applied to the flexible joint 135 by supporting it on the gantry 131 (therefore, the load is not applied to the weighing device 117).

(Level Meter) (FIG. 12) As shown in FIG. 12, the powder material input device 110 detects the input level of the powder material 1 input into the powder input container 114, and is a capacitance type. , Ultrasonic level meter 1
51 is provided on the inlet cover 136.

(Bag Filter and Dust Collection Hood) (FIG. 11) As shown in FIG. 11, the powder material input device 110 forms an air replacement port 161 in the input port cover 136 of the powder material input path 112, and A bag filter 162 is fixed to the replacement port 161 by a filter clamp 163. When selecting the bag filter 162 having an appropriate air permeability in consideration of the particle size distribution of the particles to be handled, the powder and particles input device 110 seals the powder and particles input passage 112 and the powder and particles input container 114. Dust in the space is collected, and most of the dust is retained in the container 114 by the bag filter 162, and only a small amount of dust passing through the bag filter 162 reaches the dust collection device 164 from a dust collection hood 167 described later. And the loss of the powder is small. Specifically, it is preferable to use a bag filter 162 having a mesh size of 5 to 20 μm.

As shown in FIG. 11, the dust charging device 110 is connected to a duct hose 165 connected to a dust collecting device 164 by a hose clamp 166 as shown in FIG.
7 and the dust collecting hood 167 is connected to the bag filter 16.
2 and a gap H for taking in outside air is provided between the dust collecting hood 167 and the bag filter 162.

(Dust Collection Hood Height Adjuster) (FIG. 12) As shown in FIG. 12, the granular material feeding device 110 includes a static pressure gauge 168 for detecting a static pressure in the dust collection hood 167, and a dust collection hood 167. By adjusting the height of the dust collecting hood 16
A dust collecting hood height adjusting device 169 that adjusts a gap H for taking in outside air between the dust collecting hood 7 and the bag filter 162, and adjusts the dust collecting hood height so that the static pressure in the dust collecting hood 167 becomes a constant value. The drive of the device 169 can be controlled. The dust collecting hood height adjusting device 169 is configured by an electric or pneumatic cylinder device (not shown) supported by the inlet cover 136, and the like.
Elevator 170 attached to piston rod of cylinder device
Is integrated with the dust collecting hood 167, and the elevating element 170 is moved up and down along a height adjusting guide 171 supported by the inlet cover 136, so that the height of the dust collecting hood 167 can be adjusted. In FIG. 12, 168A is a static pressure detection tube.

(Bag Filter Backwashing Apparatus) (FIG. 13) As shown in FIG. 13, the granular material feeding apparatus 110 is a bag filter backwashing for separating collected dust of the bag filter 162 toward the inside of the bag filter 162. It has a device 172. The bag filter backwashing device 172 is configured by attaching a plurality of cleaning nozzles 173 that blow compressed air instantaneously to a dust collecting hood 167 around the bag filter 162,
When the static pressure in the dust collecting hood 167 becomes equal to or less than a predetermined value, the bag filter 162 is backwashed.

(Control Device) (FIG. 14) The control device 174 of the powder and granular material feeding device 110 is constituted by a PLC (programmable controller), a solenoid valve, a pneumatic device, etc., and comprises a weighing device 117, a level gauge 151, and a static pressure gauge. 168
Is detected, the closing valve 15 (valve opening / closing device 116), the cover elevating cylinder 138, the dust collecting device 16
4. The drive of the dust collecting hood height adjusting device 169 and the bag filter backwashing device 172 is controlled as follows.

(A) Normal operation mode (1) The operator sets the granular material charging container 114 in the granular material charging device and turns on the operation button of the cover lifting cylinder 138 provided in the control device 174.

(2) The control device 174 responds to an ON operation signal of the cover lifting / lowering cylinder 138 so that the cover lifting / lowering cylinder 1
38 is operated to put the input port cover 136 into the input container 1
14 and the suction by the dust collecting device 164 is started.

(3) Subsequently, the control device 174 opens the charging valve 15 by the valve opening / closing device 116, and starts charging the granular material 1 from the granular material supply container 11 to the granular material charging container 114. In this case, the control device 174 operates the valve opening / closing device 116 in the closing operation mode described later.
The opening and closing of the input valve 15 and the drive control of the dust collecting device 164 are performed.

(4) The controller 174 obtains the detection result of the weighing device 117 and, when the charging of the set weight of the granular material 1 is completed in the container 114 or obtains the detection result of the level meter 151, When the charging level of the granular material 1 to 114 reaches the full level, the charging valve 15 is closed by the valve opening / closing device 116.

(5) A predetermined time (for example, 5 to 5 minutes) after the powder 1 of the set weight is completely charged into the powder / particle input container 114 until the floating dust in the powder / particle input passage 112 and the container 114 disappears. (10 seconds) is measured by a timer, and then the cover lifting cylinder 138 is operated to remove the charging port cover 136 from the opening of the charging container 114 and release the charging container 114. At this time, the container 114
The dust inside is settled and does not generate dust.

(B) Make-up operation mode The control device 174 controls the opening and closing of the make-up valve 15 by the valve opening / closing device 116 and the drive control of the dust collection device 164 in the above (A) of the normal operation mode (3) as follows. Perform

(1) Large-volume charging mode The measured weight of the granular material charged into the container 114, which is the detection result of the weighing device 117, is set to a predetermined switching value (for example,
Until it reaches 80% to 90%), the supply valve 15 is opened intermittently (relatively long opening time), intermittent supply (for example, intermittent supply for 2 seconds and 4 seconds closed) or the supply valve 15 is continuously In addition to controlling the valve opening / closing device 116 so as to perform continuous supply of the powder to be opened, the dust collecting device 164 is controlled so as to collect the dust in the powder material introduction passage 112.

(2) Small amount feeding mode After the detection result of the weighing device 117 reaches the above-mentioned switching value,
From the intermittent supply in which the injection valve 15 is intermittently opened with an opening time shorter than before the switching value is reached (for example, the intermittent supply in which the input valve 15 is opened for 0.5 second and the closed in 5 seconds), The valve opening / closing device 116 is controlled so as to perform intermittent supply that is switched to open intermittently (for example, intermittent supply for 0.5 seconds and closed for 6 seconds), and also stops dust collection in the powder material introduction path 112. The dust collector 164 is controlled. In other words, in this small-amount feeding mode, the dust collection suction force by the dust collection device 164 causes a measurement error of several tens g to several hundred g, so that the dust collection is stopped. At this time, the bag filter 162 also prevents dust from being generated outside.

That is, in the small-quantity feeding mode, the controller 17
The start time (for example, at least 3 to 5) is determined by taking into account the stabilization time of the weighing device 117 after the short-time opening of the charging valve 15 to perform the small-volume charging operation once.
(Seconds), and closes the injection valve 15 and waits. After the standby, it is determined whether or not the weight has reached the set weight based on the detection result of the weighing device 117. If the weight has not been reached, the input valve 15 is opened once more for a short time to perform a small-quantity input operation and wait again. In this way, until the detection result of the weighing device 117 reaches the set weight, the small amount charging operation of intermittently opening and closing the charging valve 15 is repeated (intermittent supply).

In the small-volume feeding mode, the controller 174
, The opening time of the charging valve 15 in the intermittent supply after reaching the above-mentioned switching value is gradually shortened as the measured weight of the weighing device 117 approaches the set weight.

In the small-quantity feeding mode, the controller 17
4 indicates that the closing time of the supply valve 15 in the intermittent supply after reaching the above-mentioned switching value is shorter than before the arrival of the switching value (in the continuous supply before reaching the switching value, the closing time of the supply valve 15 is zero). )Lengthen. That is, in the small-amount supply mode, the closing time of the supply valve 15 in the intermittent supply after reaching the above-described switching value is lengthened, and the supplied particles in the supplied particles supply path 112 finish falling. To do. If this time is 3 to 10 seconds, most of the suspended particles will settle, so this time may be practical. This improves weighing accuracy.

(C) Dust collection hood height adjustment mode The controller 174 obtains the detection result of the static pressure gauge 168 and adjusts the dust collection hood height so that the static pressure in the dust collection hood 167 becomes a constant value. The device 169 is driven and controlled, and the dust collection hood 16 is controlled.
The outside air intake gap H between the bag 7 and the bag filter 162 is adjusted.

(D) Bag Filter Backwash Mode The control device 174 controls the bag filter 16 even if the height of the dust collection hood 167 is adjusted by the dust collection hood height adjustment device 169.
As in the case where the detection result of the static pressure gauge 168 does not rise to a predetermined static pressure due to the clogging of the second, the dust collecting hood 167
When the static pressure in the inside becomes equal to or lower than a predetermined value, the bag filter backwashing device 172 is operated, and the bag filter 16 is
The compressed air is blown to the outside of the bag filter 162 for a predetermined time (for example, 1 to 2 seconds), and the dust collected by the bag filter 162 is removed from the bag filter 1.
The bag filter 162 is peeled inward to eliminate clogging of the bag filter 162.

When the bag filter 162 is backwashed, the charging valve 15 is raised (opened) by the valve opening / closing device 116 so that the container 114 and the like are not pressurized. (The bag filter 162)
It is preferable to synchronize when outside air flows into the powder-particles input system via the system.

Accordingly, the powder and granular material feeding device 11 of the present embodiment
0 has the following effects. Since there is a gap H for taking in outside air between the bag filter 162 and the dust collecting hood 167 that covers the bag filter 162, the closed space of the powder and granular material charging container 114 communicates with outside air via the bag filter 162, When the granules are charged into the granular material charging container 114, the air in the charging container 114 is smoothly discharged (replaced), and the granular material can be smoothly charged. Further, even if the pulsation of air accompanying the opening and closing of the valve 15 is applied to the closed space of the powder container 114 via the powder inlet channel 112, a large negative pressure or pressure is suddenly applied to the closed space of the input container 114. No pressure is applied, and the input container 114 is not deformed or damaged.

The dust in the powder-particle input container 114 and the powder-particle input channel 112 is collected by the dust collector 164 and stopped by the input container 114 by the bag filter 162. However, there is only a small loss of powder and granules from the dust collecting hood 167 to the dust collecting device 164, and there are cases where many kinds of powders are handled or cases where it is necessary to thoroughly control each production lot. Etc. can be effectively adopted for powders having high added value. At the same time, scattering of the granules into the surrounding environment is prevented. In addition, the present device does not force the dust to be collected by the dust collecting device, and the capability of the dust collecting device may be small. Further, it is not necessary to suck all the dust generated by the dust collection duct hose 165 as in the related art, and the flow of the dust through the duct hose 165 is extremely low.
No wear and obstruction of 5 and maintenance is very easy.

The outside air intake gap between the bag filter 162 and the dust collecting hood 167 covering it, that is, the dust collecting hood 167 so that the static pressure in the dust collecting hood 167 becomes a constant value.
The height of the container is adjusted, so that the sealed space of the container 114 is not subjected to a large negative pressure or pressurized state.

When the bag filter 162 is slightly clogged, the dust collecting hood 167 rises to increase the amount of outside air sucked, the suction force acting on the bag filter 162 is adjusted, and the bag filter 162 is clogged. Does not progress rapidly. That is, although the air in the powder-particle input container 114 is exhausted (replaced) for the input of the powder, the amount of the exhaust is not made excessive, and the bag filter 16
Avoid premature clogging of 2.

When the static pressure in the dust collecting hood 167 becomes equal to or less than a predetermined value, the bag filter backwashing device 172 is operated, and the collected dust of the bag filter 162 is separated toward the inside of the bag filter 162 and clogged. Can be eliminated. Even by this operation, the granular material can be effectively collected.

When the granular material charging container 114 is filled with the granular material 1, the level meter 151 detects the granular material 1 and closes the charging valve 15. Therefore, the level meter 151 functions as a safety device in the event of a failure of the weighing device 117 or as an overload prevention device.

The charging valve 15 is a container 1 for supplying the granular material.
The supply port 121A is opened and closed by moving up and down in parallel with respect to one supply port 121A.

The opening of the bag filter 162 is set to 5 to 20 μm.
By setting it to m, it is possible to reduce the collection rate, reduce the weight, and reduce the cost, without making it as fine as in a normal dust collector.

Further, according to the method for charging a granular material of the present embodiment, the following effects are obtained. Until the measured weight of the granular material reaches the switching value, in the large-volume charging mode, the charging valve 15 is opened intermittently with a relatively long opening time or continuously opened to increase the charging speed. Dust is collected in the granule charging path 112 to discharge air from the granule charging container 114, so that the air in the granule charging container 114 is easily replaced with the granule, and the powder is smoothly charged. As a result, the injection time is shortened.

After the measured weight of the granular material has reached the switching value, the charging valve 15 is intermittently opened with a relatively short opening time in the small amount charging mode to improve the weighing accuracy. The collection of dust in the charging path 112 is stopped to prevent the measurement accuracy from being deteriorated due to the floating of the granular material due to the dust collection force, thereby improving the measurement accuracy.

Since the opening time of the charging valve 15 in the intermittent supply after the measured weight of the granular material reaches the switching value is gradually reduced as the measured weight approaches the set weight, the charging amount per unit time is initially reduced. In many cases, as the weight approaches the set weight, the amount per unit time is reduced, so that the measuring accuracy is improved and the time required for charging the granules can be shortened as a whole.

Since the closing time of the charging valve in the intermittent supply after the measured weight of the granular material reaches the switching value is longer than before the switching value is reached, the granular material in the granular material charging path 112 is always The weight of the granular material can be measured in a state where it has dropped (settled) into the granular material charging container 114, and the weighing accuracy is improved.

The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to the embodiments, and the design may be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, the charging valve used in the powder and granular material feeding apparatus of the present invention is not limited to the one that moves up and down in parallel with the supply port of the powder and granular material supply unit, and may be a gate valve or a butterfly valve. Further, the granular material supply unit is not limited to the granular material supply container, and may be, for example, a fixed hopper.

[0110]

As described above, according to the present invention, when the granular material is charged into the granular material charging portion, the air is discharged from the charging portion (replacement of the granular material with air) smoothly. On the occasion,
The dust can be prevented from being collected by the dust collecting device as much as possible, and the scattering of the powder to the surrounding environment can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a powder and granular material feeding device according to a first embodiment.

FIG. 2 is a schematic view showing a charging valve.

FIG. 3 is a schematic diagram showing a weighing device.

FIG. 4 is a schematic view showing a bag sealing device.

FIG. 5 is a schematic view showing a dust collecting hood and a bag filter.

FIG. 6 is a schematic diagram showing a dust collecting hood height adjusting device.

FIG. 7 is a schematic diagram showing a bag filter backwashing device.

FIG. 8 is a schematic diagram showing a control device.

FIG. 9 is a schematic diagram illustrating a powder-particles feeding device according to a second embodiment.

FIG. 10 is a schematic view showing a powder material input device according to a third embodiment.

FIG. 11 is a schematic diagram showing a dust collecting hood and a bag filter.

FIG. 12 is a schematic diagram showing a dust collecting hood height adjusting device.

FIG. 13 is a schematic view showing a bag filter backwashing device.

FIG. 14 is a schematic diagram showing a control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Granular material 10, 110 Granular material input apparatus 11 Granular material supply container (Granular material supply part) 12, 112 Granular material input path 14 Granular material input bag (Granular material input part) 114 Granular material Input container (particulate input unit) 15 Input valve 16, 116 Valve opening / closing device 17, 81, 117 Weighing device 21A Supply port 36, 136 Input port cover 61, 161 Air replacement port 62, 162 Bag filter (filter) 64, 164 Dust collecting device 67, 167 Dust collecting hood 68, 168 Static pressure gauge 69, 169 Dust collecting hood height adjusting device 72, 172 Bag filter backwashing device (filter backwashing device) 74, 174 Control device 151 Level meter

Continued on front page F term (reference) 3E018 AA04 AB01 AB03 BA05 BA06 BB02 CA03 CA10 DA02 DA04 DA10 3F011 BA02 BC06 3F076 AA08 CA01 DB17 FA01 GA01 3F078 AA08 BB07 BB09 BB27 EA07

Claims (6)

[Claims] 1. An inlet cover provided in a powder / particle supply passage connected to a powder / particle supply unit is directly or indirectly connected to the powder / particle supply unit, and a charging valve of the powder / particle supply unit is opened / closed. A powder and granule input device that can be opened by the device and can feed the powder in the powder and grain supply section from the powder and grain input path to the powder and grain input section, wherein an air replacement port is formed in the input port cover; A dust filter, wherein a filter is provided at the replacement port, the outside of the filter is covered with a dust collecting hood connected to the dust collecting device, and a gap for taking in outside air is provided between the dust collecting hood and the filter. Body injection device. 2. A dust collector for detecting a static pressure in the dust collecting hood, and a dust collecting device for adjusting a height of the dust collecting hood to adjust a gap for taking in outside air between the dust collecting hood and the filter. A hood height adjusting device, and a control device that drives and controls the dust collecting hood height adjusting device so as to obtain a detection result of the static pressure gauge and control a static pressure in the dust collecting hood to a constant value. Item 6. The powder material feeding device according to Item 1. 3. A static pressure gauge for detecting a static pressure in the dust collecting hood, a filter backwashing device for separating collected dust of the filter toward the inside of the filter, and a detection result of the static pressure gauge is obtained. 3. The powder and granular material feeding device according to claim 1, further comprising a control device for operating the filter backwashing device when the static pressure in the dust collecting hood becomes equal to or lower than a predetermined value. 4. A level meter for detecting a level of the granular material charged in the granular material charging section, and a charging valve when the level of the granular material charged section reaches a full level based on a detection result of the level meter. And a control device for controlling the drive of the valve opening / closing device so as to close the device. 5. The granular material according to claim 1, wherein the supply valve is capable of opening and closing the supply port by vertically moving the supply valve in parallel with the supply port of the granular material supply unit. Input device. 6. The apparatus for charging a granular material according to claim 1, wherein the opening of the filter is 5 to 20 μm.