JPH11180564A - Table feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a powder from being adhered to a storage tank wall without using a stirring blade by providing a discharge opening for discharging the powder onto a rotating table on the storage tank, situating the discharge port with a space upward to the rotating table, and setting the diameter of the rotating table larger than the diameter of the discharge opening. SOLUTION: The lower end of a body part 10 regulates a discharge opening 18 for discharging a powder onto a rotating table 6. A bottom wall 12 is fixed onto a support frame. A rotating shaft 20 is rotatably supported by the support frame, and the upper end part of the rotating shaft 20 is situated so as to be protruded into a casing 8 through the bottom wall 12. The rotating table 6 is connected to the upper end part of the rotating shaft 20. The bottom wall 12 is situated in the lower side of the rotating table 6 so as to be relatively rotatable. The rotating shaft 20 is connected to an electric motor which is a drive source through a power transmitting mechanism such as sprocket, chain, reduction gear or the like. The diameter of the rotating table 6 is set larger than the diameter of the discharge opening 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table feeder which is a powder feeder for feeding powder continuously and quantitatively using a rotary table.

[0002]

2. Description of the Related Art As typical examples of a table feeder for supplying powder continuously and quantitatively using a rotary table, there are a so-called mass type table feeder and a scraper type table feeder. The scraper type table feeder includes an annular groove type and an annular grooveless type. Among them, the mass-type table feeder includes a powder storage tank and a rotary table rotatably disposed in the storage tank, as disclosed in Japanese Patent Publication No. 4-53778, for example. A plurality of measuring chambers having an upper opening for receiving the powder and a lower opening for discharging the powder are formed at an outer periphery of the rotary table at intervals in a circumferential direction. Each of the weighing chambers is separated from one another by circumferentially spaced and respective radially extending partitions. The powder storage tank has a bottom wall, which is disposed below the rotary table and has a powder discharge port formed in an outer peripheral portion thereof. At the upper portion of the outer peripheral portion of the rotary table at the portion where the discharge port is located, that is, at the upper portion of the measuring chamber, a powder cut-off cover is provided so as to cover the upper portion. Each of the weighing chambers formed on the outer periphery of the rotary table has an upper opening opened in a powder receiving area (introduction area) where no sliding cover exists when the rotary table is rotated in a predetermined direction. The lower opening is closed by the bottom wall. Further, in the powder discharge area (discharge area) where the discharge port of the bottom wall is present, the upper opening is closed by the frayed cover and the lower opening is opened to the discharge port. A stirring blade is further disposed in the storage tank above the rotary table.

When the powder is stored in the storage tank and the rotary table is rotated in a predetermined direction by the electric motor, each measuring chamber is moved through the powder receiving area and the powder discharging area. The stirring blade is also driven to rotate in the direction opposite to the rotation direction of the rotary table by the electric motor, and the powder in the storage tank is stirred. In the powder receiving area, the upper opening of the measuring chamber is opened and the lower opening is closed by the bottom wall, so that the powder in the storage tank is introduced into the measuring chamber through the upper opening. Further, in the powder discharge area, the upper opening is closed by the sliding cover and the lower opening is opened to the discharge port, so that the powder measured in the measuring chamber is discharged to the discharge port through the lower opening.

A scraper type table feeder (annular groove type) is, for example, disclosed in Japanese Patent Application Laid-Open No. Hei 7-109032, in which a powder storage tank and a rotary table rotatably disposed in the storage tank are provided. And The turntable includes a main body having a circular outer peripheral edge, a step wall hanging down from the outer peripheral edge, and an annular portion extending radially outward from the step wall. The storage tank has a peripheral wall surrounding the outer peripheral edge of the annular portion. An annular powder conveying groove is formed by the step wall and the annular portion of the rotary table and the inner peripheral surface of the peripheral wall of the storage tank. A discharge port for powder is formed in a portion of the peripheral wall that forms a part of the powder conveying groove. A powder cut-off cover is provided so as to cover an upper portion of the powder conveying groove at a portion where the discharge port exists. A discharge scraper for guiding the powder filled in the powder conveying groove toward the discharge port is provided so as to protrude into the powder conveying groove. A stirring blade is further disposed in the storage tank above the rotary table.

When the powder is stored in the storage tank and the rotary table is rotated in a predetermined direction by the electric motor, the stirring blade is also driven to rotate in the same direction as the rotary table by the electric motor, so that the powder in the storage tank is removed. Allow to stir. By the rotation of the rotary table, the powder in the powder conveying groove is moved together with the rotary table. The powder moved together with the rotary table, the upper part of the powder transport groove is cut off by the wear cover at the upper part of the discharge port, and the powder in the powder transport groove is scraped out by the discharge scraper, It is rectified and discharged quantitatively from the discharge port.

Further, the scraper type table feeder (without annular groove) has a powder storage tank and a rotary table. The lower end of the storage tank is provided with a discharge opening for discharging the powder onto the rotary table. The discharge opening is spaced above the turntable. The diameter of the turntable is defined to be larger than the diameter of the discharge opening. The powder stored in the storage tank
Since there is no peripheral wall at the lower end of the storage tank, the angle of repose is stabilized on the rotary table. A scraper for scraping powder that is in a steady state at a repose angle on the rotary table is disposed so as to extend obliquely in the rotation direction of the rotary table and above the rotary table. The scraper is positioned as if it were inserted into the powder bed from the radial outside.

When the rotary table is rotated in a predetermined direction by the electric motor, the powder on the rotary table is scraped off continuously by a scraper to the outside in the radial direction of the rotary table, and is continuously supplied.

[0008]

In the above-mentioned mass-type table feeder, since the measuring chambers (mass) partitioned from each other are arranged on the outer periphery of the rotary table, the quantitativeness is particularly excellent. This has the advantage that the flushing in which the powder flows like water is prevented. On the other hand, the powder having a strong adhesiveness grows on the storage tank wall in the upper part of the measuring chamber and forms a roof on the upper part of the measuring chamber, so that there is a problem that the powder is not introduced into the measuring chamber. In order to prevent this drawback, a stirring blade is provided and rotated, but a large resistance from the powder layer acts as a load on the rotating stirring blade. According to the inventor's research,
Although the magnitude of the resistance acting on the stirring blades differs depending on the thickness and shape of the stirring blades, it has been found that the total power required to drive the rotary table to rotate is generally 以上 or more. That is, when the stirring blade is not provided, the power required to rotate the rotary table is reduced to 1/3 or less as compared with the case where the stirring blade is provided. Therefore, the presence of the stirring blade increases the cost of the table feeder and leads to excessive consumption of energy. Further, since the stirring blade is forcibly rotated in the powder layer, the powder is unnecessarily crushed or compacted to cause deterioration. If the powder is hard, the abrasion of the stirring blade increases, and the stirring blade may be damaged. Further, since the measuring chamber and the like, which are a part of the fixed quantity introduction / discharge means, are located in the powder layer of the storage tank, it is relatively difficult to inspect and maintain the measuring chamber and the like.

In the above-mentioned scraper type table feeder (annular groove type), a portion above the powder conveying groove is cut off at the upper part of the discharge port by a sliding cover, and the powder in the powder conveying groove is discharged. The scraper is scraped out and discharged quantitatively, and the rotary table does not have a partition as in the mass-type table feeder. The scraping amount (supply amount) can be easily changed by changing the amount of insertion into the table, and the quantitativeness is good even though it is not as good as the mass-type table feeder. On the other hand, since there is no partition as in the mass-type table feeder, flushing may occur depending on the properties of the powder. In addition, the powder with strong adhesiveness grows on the storage tank wall above the powder transport groove in the storage tank and forms a bridge above the powder transport groove, and the powder is introduced into the powder transport groove. Trouble occurs. In order to prevent this drawback, a stirring blade is provided, and as a result, there is a problem that a large power is required as in the above-mentioned mass type table feeder. Further, since the powder conveying groove and the like, which are a part of the fixed amount introduction and discharge means, are positioned in the powder layer of the storage tank, inspection and maintenance of the powder conveying groove and the like are relatively difficult.

In the scraper type table feeder (without annular groove), the scraping amount (supply amount) is changed by changing the amount of insertion of the scraper into the powder layer which is stable at a repose angle on the rotary table. Since there is no storage tank wall directly above the turntable, which can be easily changed, a stirring blade is provided to prevent the introduction of powder from being hindered by the growth of adhesion to the storage wall. It does not need to be installed. However, on the other hand, since there is no partition as in the mass-type table feeder, powder flashing may occur. The quantitative accuracy is inferior to the above-mentioned scraper-type table feeder (annular groove type),
It has drawbacks such as a variation in the supply amount.

The present invention has been made on the basis of the above-mentioned facts, and the main purpose of the present invention is to prevent the growth of powder adhesion to the storage tank wall without using a stirring blade, and to achieve quantitative analysis. And to provide an improved table feeder which can easily perform inspection and maintenance of the quantitative introduction and discharge means.

[0012]

According to the present invention, there is provided a powder storage tank, and a rotary table rotatably disposed in the storage tank, wherein an outer peripheral portion of the rotary table and a bottom of the storage tank are provided. In the meantime, in a table feeder provided with a fixed amount introduction and discharge means capable of introducing and discharging a fixed amount of powder, the storage tank has a discharge opening for discharging the powder on the rotary table. A table feeder, wherein the discharge opening is positioned above the turntable at a distance above the turntable, the diameter of the turntable being defined to be larger than the diameter of the discharge opening.

In the above invention, since the wall of the storage tank does not exist directly above the rotary table, the problem that the introduction of the powder is prevented by the growth of the adhesion to the storage tank wall is reliably prevented. You. Therefore, there is no need to provide a stirring blade for stirring the powder. As a result, a large power for rotating the stirring blade is not required, so that the total power required for rotating the rotary table is one third or less as compared with the case where the stirring blade is provided. Thus, significant cost reduction and energy saving are achieved. Further, since the powder is not unnecessarily crushed or compacted, the powder does not deteriorate. Furthermore, even if the powder is hard, there is no problem such as wear or breakage of the stirring blade. In the above invention, in addition to the configuration in which the fixed amount introduction and discharge means capable of introducing and discharging the fixed amount of powder is disposed between the outer peripheral portion of the turntable and the bottom of the storage tank, Since there is no storage tank wall directly above, the powder discharged from the discharge opening of the storage tank, which is in a stable state with the angle of repose corresponding to the properties of the powder on the turntable, rotates. The table is moved radially outward of the rotary table by rotation of the table, and is introduced into the constant-quantity introduction / discharge means and discharged at a constant rate. As a result, good quantitative discharge is reliably achieved. Further, in the above invention, the discharge opening of the storage tank is positioned above the rotary table at an interval, and the diameter of the rotary table is defined to be larger than the diameter of the discharge opening. Is positioned radially outward from the powder layer immediately below, so that inspection and maintenance of the quantitative introduction / discharge means are easy. In the above-mentioned invention, a desired table feeder can be easily obtained by appropriately selecting the quantitative introduction / discharge means, which is extremely useful in practical use.

According to the present invention, there is further provided a powder storage tank, and a rotary table rotatably disposed in the storage tank. A plurality of measuring chambers having a lower opening for discharging the powder are formed in the circumferential direction, and the storage tank is disposed below the rotary table and has a bottom wall formed with a discharge port for the powder formed on the outer peripheral portion. A powder cover is disposed so as to cover an upper portion of the outer peripheral portion of the rotary table at a portion where the discharge port is present, and each of the measuring chambers is configured such that the rotary table rotates in a predetermined direction. The upper opening is opened and the lower opening is closed by the bottom wall in the powder receiving area where the wear cover does not exist, and the upper opening is closed in the powder discharging area where the discharge port exists. Blocked by the frayed cover In a table feeder in which the lower opening is open to the discharge port, the storage tank has a discharge opening for discharging powder onto the rotary table, and the discharge openings are spaced upward from the rotary table. And wherein the diameter of the turntable is defined to be greater than the diameter of the discharge opening.

In the above invention, since the wall of the storage tank does not exist directly above the rotary table, the problem that the introduction of powder is prevented by the growth of the adhesion to the storage tank wall is reliably prevented. You. Therefore, there is no need to provide a stirring blade for stirring the powder. As a result, a large power for rotating the stirring blade is not required, so that the total power required for rotating the rotary table is one third or less as compared with the case where the stirring blade is provided. Thus, significant cost reduction and energy saving are achieved. Further, since the powder is not unnecessarily crushed or compacted, the powder does not deteriorate. Furthermore, even if the powder is hard, there is no problem such as wear or breakage of the stirring blade. In the above invention, since the measuring chambers partitioned from each other are provided on the outer peripheral portion of the rotary table, the quantitativeness is particularly excellent, and further, the flushing of the powder is reliably prevented. In the above invention, the discharge opening of the storage tank is further positioned at an interval above the rotary table,
The diameter of the rotary table is defined to be larger than the diameter of the discharge opening, so that the weighing chamber, etc., which is a part of the quantitative introduction / discharge means, is positioned radially outward from the powder layer immediately below the discharge opening of the storage tank. Inspection and maintenance of the weighing chamber, the sliding cover, etc., which are a part of the fixed quantity introduction / discharge means, are easy.

According to the present invention, there is further provided a powder storage tank, and a rotary table rotatably disposed in the storage tank, wherein the rotary table has a main body having a circular outer peripheral edge, and a rotary table. A step wall hanging down from the peripheral edge, and an annular portion extending radially outward from the step wall, the storage tank includes a peripheral wall surrounding an outer peripheral edge of the annular portion, and the step wall and the annular portion and the peripheral wall An annular powder conveying groove is formed by the inner peripheral surface, a powder discharge port is formed in a portion of the peripheral wall that forms a part of the powder conveying groove, and a powder cut-off cover is formed. It is disposed so as to cover the upper part of the powder conveying groove in the portion where the discharge port exists,
In a table feeder in which a discharge scraper for guiding the powder filled in the powder conveying groove toward the discharge port is disposed so as to protrude into the powder conveying groove, the storage tank includes A discharge opening for discharging the powder on the turntable, the discharge opening being positioned above the turntable at an interval, the diameter of the turntable being defined to be larger than the diameter of the discharge opening; , A table feeder is provided.

In the above invention, since the wall of the storage tank does not exist immediately above the rotary table, the occurrence of the problem that the introduction of the powder is prevented by the growth of the adhesion to the storage tank wall is reliably prevented. You. Therefore, there is no need to provide a stirring blade for stirring the powder. As a result, a large power for rotating the stirring blade is not required, so that the total power required for rotating the rotary table is one third or less as compared with the case where the stirring blade is provided. Thus, significant cost reduction and energy saving are achieved. Further, since the powder is not unnecessarily crushed or compacted, the powder does not deteriorate. Furthermore, even if the powder is hard, there is no problem such as wear or breakage of the stirring blade. In the above invention, the upper part of the powder conveying groove is cut off by the scuffing cover at the upper part of the discharge port, and the powder in the powder conveying groove is scraped out by the discharging scraper and discharged quantitatively. As a result, good quantification is ensured. The scraping amount (supply amount) can be easily changed by changing the insertion amount of the discharge scraper into the powder conveying groove. Further, in the above-mentioned invention, since there is no partition on the rotary table as in the mass-type table feeder, smooth discharge without pulsation is performed. In the above invention, further, the discharge opening of the storage tank is positioned above the turntable at an interval, and the diameter of the turntable is defined to be larger than the diameter of the discharge opening, and is therefore a part of the fixed amount discharge means. Since the powder transport groove is positioned radially outward from the powder layer immediately below the discharge opening of the storage tank, inspection and maintenance of the powder transport groove, a part of the fixed amount introduction and discharge means, and the sliding cover are easy. is there.

A filling scraper for guiding the powder discharged onto the rotary table from the discharge opening of the storage tank to each of the measuring chambers of the rotary table or the powder conveying groove is provided above the rotary table. It is preferable to be provided so that it may extend. In the above invention, when the rotary table is rotated, the powder that is stable at the angle of repose on the rotary table is continuously scraped off radially outward of the rotary table by the filling scraper, and each powder or powder in the measuring chamber is removed. It is guided to the body conveyance groove and is supplied continuously. Therefore, the powder on the rotary table is easily and reliably guided to each of the measuring chambers or the powder conveying groove, and the powder in the storage tank is smoothly and reliably discharged.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a table feeder constructed according to the present invention will be described below in detail with reference to the accompanying drawings.

First, an embodiment of a table feeder configured according to the present invention will be described with reference to FIG. 1 and FIG. The table feeder 2, only the main part of which is shown, includes a powder storage tank (hopper) 4 and a disk-shaped rotary table 6 rotatably disposed in the storage tank 4. The storage tank 4 includes a casing 8 disposed at the bottom thereof,
And a cylindrical main body 10 mounted on the casing 8. The casing 8 includes a disc-shaped bottom wall 12 and a bottom wall 1.
The peripheral wall 14 includes a cylindrical peripheral wall 14 extending upward from a peripheral edge portion thereof, and an annular flange portion 16 horizontally extending radially inward from an upper end of the peripheral wall 14. The lower end of the main body 10 is mounted at the center of the flange 16 of the casing 8. The lower end of the main body 10 defines a discharge opening 18 for discharging powder onto the turntable 6. The bottom wall 12 is fixed on a support frame (not shown). The rotating shaft 20 is rotatably supported by the support frame, and the upper end of the rotating shaft 20 is positioned so as to penetrate the bottom wall 12 and protrude into the casing 8. Between the rotating shaft 20 and the bottom wall 12, a sealing means 22 known per se is interposed.
The turntable 6 is connected to the upper end of the rotating shaft 20. The bottom wall 12 is positioned below the turntable 6 so as to be relatively rotatable. The rotating shaft 20 is connected to an electric motor as a driving source via a power transmission mechanism such as a sprocket, a chain, and a reduction gear (neither is shown).

The rotating table 6 has a circular wall 24 extending downward.
Are formed on the circular wall 24, and partition walls (partitions) 26 extending radially outward by a certain length are formed at intervals in the circumferential direction. Each of the circular wall 24 and the partition wall 26 cooperates with the inner peripheral surface of the peripheral wall 14 of the casing 8 and the upper surface of the bottom wall 12 which are relatively rotatably positioned so as to surround the radial outer side of each of the partition walls 26. Then, a plurality of measuring chambers 28 are formed on the outer periphery of the turntable 6 at intervals in the circumferential direction. Each of the weighing chambers 28 is circumferentially divided by a partition wall 26 and has a substantially rectangular shape when viewed from the axial direction of the turntable 6. The discharge opening 18 of the storage tank 4 is positioned above the rotary table 6 at a predetermined interval, and the diameter of the rotary table 6 (the diameter defined by each radial outside of the partition wall 26) is
It is defined larger than the diameter of the discharge opening 18. Each of the measuring chambers 28 has an upper opening 30 and a lower opening 32 on the upper and lower surfaces.
have. A single powder discharge port 34 is formed in the outer peripheral portion of the bottom wall 12. Discharge port 34 of bottom wall 12
A discharge pipe 36 for powder is mounted below the bottom.

At the upper portion of the outer peripheral portion of the turntable 6 at the portion where the discharge port 34 exists, that is, at the upper portion where the measuring chamber 28 exists, a powder cut-off cover 38 is disposed so as to cover the upper portion. I have. Peripheral wall 1 of casing 8
4 is provided with two scrapers 40 for filling (introducing) powder. The filling scraper 40 is a scraper for guiding (introducing) the powder discharged onto the turntable 6 from the discharge opening 18 of the storage tank 4 to each of the measuring chambers 28, and above the outer peripheral portion of the turntable 6. Are arranged to extend with a gap therebetween. The scraper 40 is positioned so as to cross diagonally with respect to the rotation direction of the turntable 6. The measuring chamber 28 and the discharge port 3 described above are used.
4. The wear cover 38, the filling scraper 40, and the like constitute a unit for introducing and discharging a fixed amount of powder.

Next, the operation of the table feeder 2 configured as described above will be described. The powder charged and stored in the main body 10 of the storage tank 4 is discharged from the discharge opening 18 onto the turntable 6. The powder discharged onto the turntable 6 has no surrounding wall at the lower end of the main body 10, and is stabilized on the turntable 6 at an angle of repose according to the properties of the powder. The scraper 40 is positioned as if it were inserted into the powder layer from the outside in the radial direction. When the rotary table 6 is rotated in the counterclockwise direction in FIG. 2 by the electric motor, each of the measuring chambers 28 formed on the outer peripheral portion of the rotary table 6 has a powder receiving area (introduction) where the sliding cover 38 does not exist. In the region, the upper opening 30 is opened and the lower opening 32 is closed by the bottom wall 12. The powder on the rotary table 6 is continuously scraped off radially outside the rotary table 6 by the scraper 40,
It is guided to each of the measuring chambers 28 and is supplied continuously. Therefore, the powder on the rotary table 6 is easily and reliably guided to each of the measuring chambers 28, and the powder in the main body 10 of the storage tank 4 is smoothly and reliably discharged. Further, in the powder discharge area (discharge area) where the discharge port 34 of the bottom wall 12 is present, the upper opening 30 is closed by the sliding cover 38, and the lower opening 32 is opened to the discharge port 34, and the powder in the measuring chamber 28 is opened. The body is discharged from the discharge port 34 into the discharge pipe 36 in a fixed amount while passing through the discharge port 34.

As is apparent from the above description, in the table feeder 2, since the wall of the storage tank 4 does not exist directly above the rotary table 6, the introduction of powder is prevented by the growth of the adhesion to the storage tank wall. Is reliably prevented from occurring. Therefore, there is no need to provide a stirring blade for stirring the powder. As a result, a large power for rotating the stirring blade is not required, so that the total power required for rotating the rotary table is one third or less as compared with the case where the stirring blade is provided. Thus, significant cost reduction and energy saving are achieved. Further, since the powder is not unnecessarily crushed or compacted, the powder does not deteriorate. Furthermore, even if the powder is hard, there is no problem such as wear or breakage of the stirring blade.
Further, since the weighing chambers 28 partitioned from each other are provided on the outer peripheral portion of the turntable 6, the quantitativeness is particularly excellent, and further, the flushing of the powder is reliably prevented. Furthermore, storage tank 4
The discharge opening 18 of the rotary table 6 is positioned at an interval above the rotary table 6, and the diameter of the rotary table 6 is
8, the metering chamber 28, etc., which is a part of the quantitative introduction and discharge means, is positioned radially outward from the powder layer immediately below the discharge opening 18 of the storage tank 4, so that the quantitative introduction Measuring chamber 2 which is part of the discharging means
8. Inspection and maintenance of the wear cover 38, the filling scraper 40 and the like are easy.

Next, another embodiment of the table feeder constructed according to the present invention will be described with reference to FIGS. In FIGS. 3 and 4, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description will be omitted. Table feeder 50, only the main part of which is shown
Has a powder storage tank 4 and a disk-shaped rotary table 52 rotatably disposed in the storage tank 4. Storage tank 4
The casing 8 includes a casing 8 disposed at the bottom thereof, and a cylindrical main body 10 mounted on the casing 8. The casing 8 includes a disk-shaped bottom wall 54, a cylindrical peripheral wall 56 extending upward from the peripheral edge of the bottom wall 54, and an annular flange portion 16 extending horizontally inward in the radial direction from the upper end of the peripheral wall 14. ing. The lower end of the main body 10 is mounted at the center of the flange 16 of the casing 8. The lower end of the main body 10 has a discharge opening 1 for discharging powder onto the turntable 6.
8 is specified. The bottom wall 12 is fixed on a support frame (not shown). This support frame has a rotating shaft 20.
Are rotatably supported, and the upper end of the rotating shaft 20 is
2 and projecting into the casing 8. Between the rotating shaft 20 and the bottom wall 12, a sealing means 22 known per se is interposed. Rotary table 6
Is connected to the upper end of the rotating shaft 20. The bottom wall 5
Reference numeral 4 is positioned below the turntable 52 so as to be relatively rotatable. The rotating shaft 20 is connected to an electric motor as a driving source via a power transmission mechanism such as a sprocket, a chain, and a reduction gear (neither is shown).

The rotary table 52 has a main body portion 58 having a circular outer peripheral edge, a step wall 60 hanging down from the outer peripheral edge of the main body portion 58, and an annular shape extending radially outward from the step wall 60 horizontally by a predetermined length. And a portion 62. Casing 8
Is positioned so as to be relatively rotatable so as to surround the outer peripheral edge of the annular portion 62 of the turntable 52. Storage tank 4
The bottom wall 54 is positioned below the turntable 52 so as to be relatively rotatable. An annular powder conveying groove 64 is formed on the outer peripheral portion of the rotary table 52 by the step wall 60 and the annular portion 62 of the rotary table 52 and the inner peripheral surface of the peripheral wall 56 of the storage tank 4. A powder discharge port 65 is formed in a portion of the peripheral wall 56 that forms a part of the powder conveying groove 62. Peripheral wall 56
Frames 66 are arranged on both sides of the discharge port 65 in the circumferential direction. Each of the frames 66 extends radially outward from the peripheral wall 56, and a discharge pipe 68 is provided below each of the frames 66. The discharge pipe 68 is the discharge port 6
5 is connected. An upper portion of an outer peripheral portion of the rotary table 52 at a portion of the peripheral wall 56 where the discharge port 65 is present;
Therefore, a powder cutting cover 70 is provided above the powder conveying groove 64 so as to cover the upper portion. A portion of the trivial cover 70 is also arranged to cover the upper surface of each of the frames 66 and extends radially outward of the peripheral wall 56 of the storage tank 4. On the peripheral wall 56 of the casing 8, two powder filling scrapers 40 are disposed.

An ejection scraper 72 is provided below the slotting cover 70. The discharge scraper 72 is
A scraper for guiding the powder filled in the powder conveying groove 64 toward the discharge port 65;
It is arranged to protrude inside. The scraper 70
The base end is pivotally supported by a shaft 74, and in the present embodiment, the position shown by the dotted line in FIG.
It is actuated to a fully open position in contact with zero, a half open position and a fully closed position (not shown). The shaft 74 is the wear cover 70
Is rotatably supported by a portion of the peripheral wall 56 extending outward in the radial direction, and the scraper 72 is fixed to a shaft 74. The upper end of the shaft 74 projects upward from the sliding cover 70, and one end of a link 75 is fixed to the projecting portion of the shaft 74. The other end of the link 75 is connected to the piston rod of the air cylinder 76 so as to be relatively rotatable. Since the shaft 74 is turned by the reciprocation of the piston rod, the scraper 70 is operated by the air cylinder 76 as described above. As the air cylinder 76, a known three-position operation air cylinder is used. The construction and operation itself in the vicinity of the discharge scraper 72, the air cylinder 76, the sliding cover 70, and the discharge port 65 do not constitute a novel feature of the present invention. For example, see the above-mentioned JP-A-7-109032. Since the disclosed one can be used preferably, further description is omitted. The above-described powder conveying groove 64, the discharge port 65, the discharge scraper 72, the scissor cover 70, the filling scraper 40, and the like constitute a fixed amount introduction / discharge unit.

Next, the operation of the table feeder 50 configured as described above will be described. The powder charged and stored in the main body 10 of the storage tank 4 is discharged onto the turntable 52 from the discharge opening 18. Since the peripheral wall of the powder discharged on the turntable 52 is eliminated at the lower end of the main body 10, the powder is stabilized on the turntable 52 at an angle of repose according to the properties of the powder. The scraper 40 is positioned as if it were inserted into the powder layer from the outside in the radial direction.
In the illustrated embodiment, the discharge scraper 72 is positioned at the fully open position by the air cylinder 76. When the rotary table 6 is rotated in the counterclockwise direction in FIG. 4 by the electric motor, the powder on the rotary table 52 is continuously scraped off radially outside of the rotary table 52 by the scraper 40, and the powder conveying grooves 64. And continuously supplied. Therefore, the powder on the rotary table 52 is easily and reliably guided to the powder conveying groove 64, and the powder in the main body 10 of the storage tank 4 is smoothly and reliably discharged. The powder in the powder conveying groove 64 is also moved together with the rotary table 52. The powder moved together with the rotary table 52 has its upper part above the powder conveying groove 64 cut off by the triturating cover 70 above the discharge port 65, and the powder in the powder conveying groove 64 is discharged by a discharging scraper. It is scraped out by the nozzle 72, rectified, and quantitatively continuously discharged from the discharge port 65 into the discharge pipe 68.

As is apparent from the above description, in the table feeder 50, since the wall of the storage tank 2 does not exist directly above the rotary table 52, the introduction of powder is prevented by the growth of the adhesion to the storage tank wall. Is reliably prevented from occurring. Therefore, there is no need to provide a stirring blade for stirring the powder. As a result, a large power for rotating the stirring blade is not required, so that the total power required for rotating the rotary table is one third or less as compared with the case where the stirring blade is provided. Thus, significant cost reduction and energy saving are achieved. Further, since the powder is not unnecessarily crushed or compacted, the powder does not deteriorate. Furthermore, even if the powder is hard, there is no problem such as wear or breakage of the stirring blade. In addition, in the upper part of the discharge port 65, the sliding cover 7
0, the portion above the powder conveying groove 64 is worn off, and the powder in the powder conveying groove 64 is discharged by the scraper 7 for discharging.
2 and is discharged quantitatively continuously, so that a good quantitative property is secured. Further, the scraping amount (supply amount) can be easily changed by changing the insertion amount of the discharge scraper 72 into the powder conveying groove 64, that is, the opening degree. In addition, since there is no partition on the rotary table 52 as in the mass-type table feeder, smooth discharge without pulsation is performed. Further, the discharge opening 18 of the storage tank 4 is
, The diameter of the turntable 52 is defined to be larger than the diameter of the discharge opening 18, so that the powder conveying groove 64, which is a part of the fixed amount introduction and discharge means, is located immediately below the discharge opening 18. Is positioned radially outward from the powder layer of the above, so that inspection and maintenance of the powder conveying groove 64, a parting cover 70, the filling scraper 40, the discharging scraper 72, etc., which are a part of the quantitative introduction and discharge means, are easy. It is.

In the above embodiment, the filling scraper 40 is provided, but the properties of the powder, the gap between the discharge opening 18 of the storage tank 4 and the rotary table 6 (or 52), and the rotation of the discharge opening 18 The filling scraper 40 can be omitted depending on the degree of difference in diameter from the table 6 (or 52).

[0031]

According to the table feeder of the present invention, the growth of powder adhesion to the storage tank wall can be reliably prevented without using a stirring blade, and excellent quantitativeness is ensured. Further, inspection and maintenance of the fixed quantity introduction / discharge means can be easily performed. The fact that excellent quantitative performance is ensured even without the use of stirring blades means that excellent quantitative supply of powder can be achieved while achieving significant cost reductions and energy savings. The invention is extremely useful in practice.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a table feeder configured according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a main part of another embodiment of the table feeder configured according to the present invention.

FIG. 4 is a sectional view taken along the line BB of FIG. 3;

[Explanation of symbols]

 2, 50 Table feeder 4 Storage tank 6, 52 Rotary table 8 Casing 12, 54 Bottom wall 14 Peripheral wall 18 Discharge opening 28 Measuring chamber 30 Upper opening 32 Lower opening 34, 65 Discharge port 38, 70 Ground cover 40 Scraper for filling 64 Powder Conveyance groove 72 Discharge scraper 76 Air cylinder

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[Procedure amendment]

[Submission date] February 19, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

Claims (4)

[Claims] 1. A storage tank for powder, and a rotary table rotatably disposed in the storage tank, wherein powder is introduced between an outer peripheral portion of the rotary table and a bottom of the storage tank. In a table feeder provided with a fixed-quantity introduction / discharge means capable of constant-quantity discharge, the storage tank has a discharge opening for discharging powder on the rotary table, and the discharge opening is provided with respect to the rotary table. A table feeder, which is positioned at an upper distance, wherein a diameter of the rotary table is defined to be larger than a diameter of the discharge opening. 2. A storage tank for powder, and a rotary table rotatably disposed in the storage tank, an upper opening for receiving the powder and discharging the powder at an outer peripheral portion of the rotary table. A plurality of measuring chambers having a lower opening are formed in a circumferential direction, the storage tank includes a bottom wall which is arranged below the rotary table and a discharge port of the powder is formed on an outer peripheral portion, and a A slicing cover is disposed so as to cover an upper portion of the outer peripheral portion of the rotary table in a portion where the discharge port is present, and each of the measuring chambers is configured to perform the slicing when the rotary table is rotated in a predetermined direction. The upper opening is opened and the lower opening is closed by the bottom wall in the powder receiving area where no cover exists, and the upper opening is closed by the sliding cover in the powder discharging area where the discharge port is present. And the lower opening is In a table feeder opened to an outlet, the storage tank has a discharge opening for discharging powder onto the rotary table, and the discharge opening is positioned at an interval above the rotary table, Wherein the diameter of the table feeder is defined to be larger than the diameter of the discharge opening. 3. A storage tank for storing powder, a rotary table rotatably disposed in the storage tank, wherein the rotary table has a main body having a circular outer peripheral edge, and a step hanging down from the outer peripheral edge. A wall, and an annular portion extending radially outward from the step wall, the storage tank includes a peripheral wall surrounding an outer peripheral edge of the annular portion, and the stepped wall and the annular portion and an inner peripheral surface of the peripheral wall define An annular powder conveying groove is formed, a powder discharge port is formed in a portion of the peripheral wall that forms a part of the powder conveying groove, and a powder cut-off cover has the discharge port. A discharge scraper disposed to cover the upper portion of the powder conveying groove at the portion and guiding the powder filled in the powder conveying groove toward the discharge port is provided in the powder conveying groove. In a table feeder arranged to protrude, the storage tank discharges powder onto the rotary table. A discharge opening, the discharge opening being spaced above the rotary table, the diameter of the rotary table being defined to be larger than the diameter of the discharge opening. feeder. 4. A filling scraper for guiding powder discharged onto the rotary table from the discharge opening of the storage tank to each of the weighing chambers of the rotary table or the powder conveying groove is provided. Is arranged to extend above,
The table feeder according to claim 2 or 3.