JPH0449549Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an apparatus for continuously supplying powder in a set amount, and more particularly to an apparatus for quantitatively supplying powder with good airtightness.

[Prior art]

BACKGROUND OF THE INVENTION Rotary powder quantitative supply devices have been used to continuously and accurately supply powders and fine particles (hereinafter referred to as powders) such as cement and grain flour in a set amount. This device has a measuring chamber arranged between a powder introduction section connected to a powder storage section such as a hopper provided at the top and a powder discharge section at the bottom, and a measuring chamber between the powder introduction section and the measurement chamber. An upper rotary disk is provided, and a lower rotary disk is installed between the measuring chamber and the powder discharge disk. The upper and lower rotary disks are synchronously rotated at a constant speed set by a separately provided drive source, and powder is periodically passed from the powder introduction section to the measuring chamber through openings provided in each. Powder is fed in a fixed amount continuously from the measuring chamber to the powder discharging section and repeatedly measured using a so-called measuring mass. In addition, this measuring chamber is often made into multiple measuring chambers arranged radially by dividing the cylinder body with a radial partition wall.
The upper rotary disk, the cylindrical body, and the lower rotary disk are arranged coaxially in order, and as the upper rotary disk rotates, powder is sequentially filled into each measuring chamber through its opening, and is angularly shifted from the opening. The metered powder is sequentially discharged to the powder discharge section through the opening of the lower rotary disk which is rotated synchronously and has an opening. The amount of powder discharged per given time, that is, the amount of powder supplied, is proportional to the rotational speed of the upper and lower rotary disks that rotate synchronously.

[Problem that the invention attempts to solve]

Such a conventional powder quantitative supply device includes upper and lower rotary disks that rotate while forming sliding surfaces between the upper and lower portions of a fixed measuring chamber, respectively.
Furthermore, another sliding surface is formed between the opposite surface of the upper rotating disk and the powder introduction part, and these three sliding surfaces form a rotating seal to prevent powder from leaking to the outside. Ta.

However, it is very difficult to simultaneously process and assemble these three sliding surfaces with high precision and with a predetermined contact pressure. For this reason, it was unavoidable to repeat the trial-and-error process of assembling the parts and then disassembling them again if they did not work well and re-aligning them. Furthermore, as the equipment is manufactured using a large amount of man-hours, the sliding surfaces wear out and the airtightness deteriorates over time, making it necessary to disassemble and repair the equipment after a certain period of time. It was hot.

[Means for solving problems]

The present invention solves the problems of conventional powder quantitative supply devices, and provides a device that is easy to manufacture, provides high airtightness, and can maintain airtightness without disassembling and repairing for a long time. This is the purpose.

The powder quantitative supply device of the present invention has a plurality of metering units formed by partitioning a cylindrical body radially through an opening of an upper rotary disk through which powder is introduced from a powder introduction part and rotates at a predetermined speed. The chamber is sequentially filled and weighed, and the measured powder in the measuring chamber is sequentially discharged to a powder discharge section through an opening or a notch in a lower rotary disk that rotates in synchronization with the upper rotary disk. The powder quantitative supply device is configured to provide an elastic force for applying an elastic force in the axial direction to the upper rotary disk and the lower rotary disk, respectively, so that at least the upper rotary disk and the measuring chamber, and the rigid bodies of the measuring chamber and the lower rotary disk are pressed against each other to form a rotary seal.

According to a particularly preferred embodiment of the present invention, the driving force from the drive source for rotating the upper rotary disk is transmitted to the outer circumference of the upper rotary disk, and A disc is coaxially coupled to the upper rotary disc by a rotating shaft with the cylindrical body in between, whereby the lower rotary disc is rotated in synchronization with the upper rotary disc, and the cylindrical body is coupled to the upper rotary disc by a rotating shaft. It is configured to be coaxially supported by the rotating shaft via the rotating shaft.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a partial cross-sectional side view of an embodiment of the powder quantitative supply device of the present invention, and FIG. 2 is an exploded perspective view of the main parts of the device shown in FIG.

In FIG. 1, the powder introduction section 2 provided at the top of the powder quantitative supply device 1 has an upper opening communicating with the bottom opening of the hopper 3, and the powder in the hopper is transferred in the direction of the arrow. It is now possible to introduce it. The upper rotary disk 4 constituting the bottom of the powder introduction section 2 has a disk shape with a fan-shaped opening 5 (see Fig. 2), and its center is connected to a rotating shaft 6 so that it can rotate freely. It's summery. A sprocket 8 is attached to the outer periphery 7 of the upper rotary disk 4 by bolts 9, and a sprocket 11 and a chain 12 of an output shaft 10 of a drive source such as a low rotation speed motor, such as a geared motor, whose rotation speed can be arbitrarily adjusted. connected by. Next, the lower part of the rotating shaft 6 is rotatably supported by a cylindrical boss 14 via a bearing 13, and the inner circumferential surface of a cap-shaped support 15 engaged with the shaft 6 is connected to the upper part of the boss 14. It is stabilized by sliding on the outer circumferential surface. A sealing member 16 made of an elastic material such as rubber is attached to the tip of the support 15 to prevent powder from entering the bearing 13 from the outside. Further, a thrust bearing may be provided at the lower end of the shaft 6 if necessary.

On the other hand, the upper part of the rotating shaft 6 is extended into the powder introduction section 2, and a truncated conical end cap 18 is attached thereto by bolts 19 with a holed disc-shaped holding member 17 sandwiched between them. There is. This bolt 19
is screwed to the nut 21 via the end plate 20 at its lower end through a through hole in the rotating shaft 6, but it is also possible to lock it by screwing directly to the upper part of the rotating shaft 6. good. A scraper 23 is fixed onto the end cap 18 by a bolt 19 at the top and a bolt 22 at the inclined surface, and rotates together with the end cap 18 to form a bridge in the powder flowing down into the powder introduction section 2. to prevent it from happening.

A plurality of measuring chambers 24 are formed below the upper rotary disk 4. As shown in Fig. 2, eight measuring chambers 24 are provided, each of which has a cylindrical body 25 open at the top and bottom, divided radially into equal parts by partition plates 26. It can be increased or decreased accordingly. Further, an inner cylinder 27 is provided coaxially at the center of the cylinder body 25, and an annular groove 28 is carved at the top of the inner cylinder 27, which contacts the upper rotary disk 4. Further, a plurality of holes 29 are opened at the bottom of the annular groove 28 and penetrate through the inner cylinder 27 . The inside of the inner cylinder 27 is supported by the rotating shaft 6 via a bearing 30, whereby the measuring chamber 24 is isolated from the rotational force of the rotating shaft 6 and fixed to the main body of the powder quantitative supply device 1. It's stopped. The annular groove 28 and the hole 29 described above constitute a bypass passage for bypassing the powder entering the inside of the bearing 30 from the measuring chamber 24, and the lower surface of the upper rotary disk above the annular groove 28 and/or , a scraper such as a brush may be provided on the upper surface of the support body 31 directly below it (the function of the bypass passage will be described later).

Next, the shaft portion of the support 31 is coupled to the rotating shaft 6 below the measuring chamber 24, and a ball plunger (see FIG. 3) is inserted into a plurality of holes in a fan-shaped portion at the tip of the support (see FIG. A lower pressing means 32 is embedded therein, which includes a coil spring 46 and a steel ball 45 located at the tip thereof, and urges the steel ball 45 outward by the elastic force of the spring. A lower rotary disk 33 made of a fan-shaped rigid body is mounted with its lower surface in contact with the top of each ball plunger of the lower pressing means 32.
is due to the upward elastic force of the lower elastic means 32,
A part of the periphery of the upper surface thereof is brought into pressure contact with the periphery of the lower opening of the measuring chamber 24. A locking member 34 for holding the lower rotary disk 33 in a predetermined position is appropriately provided on the upper surface of the support body 31 at a position in contact with the outer and inner peripheral edges of the lower rotary disk 33 (see FIG. 2).

On the other hand, a ring-shaped mounting body 36 is provided near the lower end of the peripheral wall 35 of the powder introduction part 2, and a sealing member 37 made of a ring-shaped rigid body that can freely move up and down within the space of the annular groove at the lower end. is inserted. The sealing member 37 is biased downward by an upper elastic pressure means 38 consisting of a ball plunger embedded in vertical through-holes that are bored almost uniformly along the entire circumference of the mounting body 36. The lower surface is brought into pressure contact with the upper surface of the periphery of the upper rotary disk 4. Further, pressurized gas such as air is supplied from a pipe 40 into an annular groove 39 provided along the entire lower circumference of the seal member 37 through an introduction hole provided at at least one location in the seal member 37 . This pressurized gas is applied to the peripheral wall 3 by the sealing member 37.
5 and the upper rotary disk 4 more securely.

The lower pressing means 32 for the lower rotary disk and the upper pressing means 38 for the upper rotary disk described above are not limited to ball plungers, but may also be formed of elastic materials such as plate springs and rubber plates that generate a biasing force. good. Further, the upper pressing means 38 may be one that presses the peripheral wall 35 itself downward. In that case, the lower end periphery of the peripheral wall 35 becomes a seal member 37, which is pressed against the upper surface of the upper rotary disk 4 to form a rotary seal. do. It is clear that the lower end can then be supplied with pressurized gas as described above. on the other hand,
In the lower rotary disk 33, it and the support body 31 are integrated, and the lower pressing means 3 provided between the two is integrated.
2 may be omitted, and instead, a pressing means for biasing the entire integrated lower rotary disk upward may be provided.

The aforementioned lower rotary disk 33 is rotated together with the support body 31 by the rotary shaft 6, that is, rotated in synchronization with the upper rotary disk 4. The lower rotary disk 33 and the tip of the support supporting it are fan-shaped, and the area thereof is large enough to at least close the lower opening of the measuring chamber 24 during powder metering. The portion of the lower elastic pressure means 32 other than the fan-shaped portion corresponds to an opening for discharging powder from the measuring chamber 24. The location corresponding to this opening in FIG. 1 is numbered 40. The lower rotary disk 33 is not limited to such a fan-shaped shape, but may be semicircular or circular like the upper rotary disk 4, and a portion thereof may be provided with, for example, a fan-shaped opening. In that case, the shape of the lower support body 31 is also the same as that of the lower rotary disk 33. However, it is most preferable to form the lower rotary disk 33 into a fan shape, thereby minimizing the sliding resistance and reducing the driving force of the device. At the same time, the amount of powder that enters the sliding contact portion can be reduced. That is, if it were a circular plate, the sliding surface would be wider and powder would enter there, causing various problems, but this fan-shaped embodiment can prevent such problems. Next, the positions of the introduction opening 5 of the upper rotary disk 4 and the opening of the lower rotary disk 33 must not be aligned in the axial direction, so that when filling the powder into the measuring chamber 24 from the opening 5. The opening must be at an angle away from the measuring chamber, and the lower opening of the measuring chamber must be closed by the non-opening part of the lower rotary disk 33, and conversely, the powder must be discharged from the opening. Inside, there must be no opening 5 above the metering chamber. Therefore, the normal introduction opening 5 and the discharge opening are offset relative to each other by an angle equal to at least one metering chamber. When setting up multiple measuring rooms,
It is also possible to use two or more measuring chambers at the same time for parallel measurement, and in such a case, a plurality of introduction openings 5 and discharge openings are also provided, but in that case, the relative relationship between the two Setting the position can be considered in the same way as described above.

A powder discharge section 41 is provided below the lower rotary disk 33 (and the support body 31). The discharge section 41 includes a cylindrical peripheral wall 42 having flanges on the upper and lower sides, and four partition plates 43 that support the boss 14 (see FIG. 2).
The bottom part is a pipe 4 that leads to the powder supply destination.
It is connected to 4.

[Effect]

Next, the operation of the apparatus shown in FIG. 1 will be explained. The powder in the hopper 3 falls under its own weight into the powder introducing section 2 as shown by the arrow, and always fills the inside of the introducing section 2. A drive source (not shown) is started and its rotational speed is set according to the amount of powder to be supplied per unit time. The rotation of the drive source is transmitted from the sprocket 11 of the output shaft 10 to the sprocket 8 via the chain 12, rotating the upper and lower rotary disks 4, and the driving force is transmitted via the rotary shaft 6 to the support 31 and fixed thereto. The lower rotary disk 33 that has been rotated is rotated.

Powder is filled into the measuring chamber 24 from the powder introduction part 2 during a period when the upper rotary disk 4 rotates and its opening 5 overlaps with the upper opening of any one measuring chamber 24. The lower opening is closed at least during that time by the lower rotary disk 33. When the powder measurement in the measurement chamber is completed in this way, the opening 5 of the upper rotary disk 4 is rotated to the next adjacent measurement chamber 24 to start measurement. At this time, the lower opening of the measuring chamber is similarly closed by the lower rotary disk 33. On the other hand, at that point, the lower opening of the measuring chamber 24 whose measurement has been completed is aligned with the discharge opening of the lower rotary disk 33, and the weighed powder flows from the opening to the powder discharge section 41 below as indicated by the arrow. It is discharged like this. In this way, the measuring chambers 24 arranged in parallel around the rotary shaft 6 are used to sequentially and endlessly measure the powder, and the powder is discharged in the set amount, that is, supplied to the destination. On the other hand, the rotation of the rotating shaft 6 also rotates the scraper 23 provided in the powder introduction section 2, thereby preventing the formation of bridges in the powder.

When the upper rotary disk 4 is rotating, the upper surface of its outer circumferential portion slides in pressure contact with the lower surface of the ring-shaped seal member 37 which is pressed downward by the upper pressure means 38, so that the upper rotary disk 4 is rotated. It rotates while being pressed and slid onto the periphery of the cylindrical body 25 of the lower measuring chamber 24. In this way, an airtight rotary seal is formed between the peripheral wall 35 and the upper rotary disk 4, and between the upper rotary disk 4 and the measuring chamber 24, and leakage of powder from between them is prevented. Furthermore, as described above, the pressurized gas supplied into the annular groove 39 at the bottom of the seal member 37 prevents the powder from leaking from the lower end of the peripheral wall 35 to the outside along the upper surface of the outer peripheral part of the upper rotary disk 4. Effectively prevent.

Similarly, the lower rotary disk 33 also has a lower pressing means 3.
2 and rotates while being pressed against the periphery of the lower opening of the measuring chamber 24, an airtight rotary seal is formed between the measuring chamber 24 and the lower rotary disk 33, and powder leakage between them is prevented. is prevented. When filling the measuring chamber 24 with powder and discharging the powder from there,
The pressure within the metering chamber 24 becomes non-uniform due to the movement of the powder, and pressure differences occur particularly in the vertical direction. Therefore, a pressure difference occurs between the lower surface of the upper rotary disk 4 and the sliding surface of the inner cylinder 27, and between the sliding surface of the inner cylinder 27 and the upper surface of the lower rotary disk 33, and the powder in the measuring chamber 24 moves along these sliding surfaces. and enters in the direction of the bearing 30. However, as described above, the powder that has entered flows into the bypass passage with low flow resistance formed by the annular groove 28 and hole 29, and is prevented from entering the bearing 30. When a scraper is provided on the lower surface of the upper rotary disk, the powder on the annular groove 28 can be introduced into the hole 29 more quickly. Similarly, if a scraper is provided on the upper surface of the support 31, the powder that has fallen from the hole 29 can be more efficiently discharged to the opening.

Such a powder supply device is used as shown in FIG. 4, for example. That is, a large number of type hoppers 5
The powder quantitative supply device 52 is located at the lower end of the container 1. Then, the blending ratios of various powders are input into a computer (not shown), and the rotational speed of a motor (not shown) of the supply device is controlled by an inverter. First, each type of powder is conveyed to the hopper 51 by the carry-in conveyor 48, and the slide gate 49 at an appropriate position is opened, and the bifurcated switching damper 50 is appropriately switched to transfer the powder to one of the type hoppers 51. supply. In this embodiment, up to eight types of powder can be stored in each hopper. Usually, the bifurcated partition damper 53 is located on the side of the passage that directly supplies the mixing screw conveyor. And unloading hopper 5
6 and the hopper scale 57, and further to the bulking conveyor via the bifurcated switching damper 53, or directly packed into bags 59.

In this way, various types of powder are discharged from the apparatus in cut-out amounts almost in accordance with the instructions from the computer. Next, at regular intervals, the bifurcated switching damper 53 is switched and supplied to the automatic test-piercing device 54, and the error between the planned partition amount and the actual partition amount is output. This information is then fed back to the computer, and the rotational speed of the motor of each powder quantitative supply device is adjusted by the inverter described above to bring it closer to the planned value. The feature of this type of compounding device is that each type of powder is continuously fed into the mixing screw conveyor 55 in an amount according to the compounding ratio from each type of hopper, so that it is possible to achieve a very uniform compounding even without a special stirring device. is obtained. Furthermore, the entire device becomes compact and the mixing ratio can be changed as desired.

[Effect of idea]

The powder quantitative supply device of the present invention provides a sealing member made of a rigid body between the peripheral wall of the powder introduction part and the upper rotary disk, and elastically presses the sealing member and the lower rotary disk made of the rigid body into the measuring chamber. between the peripheral wall and the upper rotary disk,
By configuring separate rotary seals between the measuring chamber and the lower rotary disk, not only is manufacturing easy and eliminates the need for a trial-and-error sliding process, but the wear of the sliding surfaces due to use is also automatically prevented. This has effectively eliminated the need for disassembly and repair due to wear and tear. Furthermore, since the rotary seal is always formed with a constant contact pressure, fluctuations in airtightness can be significantly improved.

In addition, when the lower rotary disk is not circular but has a fan-shaped shape large enough to close the lower opening of at least one measuring chamber during measurement, the contact area between the measuring chamber and the lower rotary disk Since it is possible to reduce the amount of wear, the sliding resistance can be reduced and the amount of wear can also be reduced.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the powder quantitative supply device of the present invention, and is a partial cross-sectional view of the device viewed from the side.
The figure is an exploded perspective view of the main parts of the device shown in FIG. 1, FIG. 3 is a longitudinal cross-sectional view showing an example of the lower pressing means 32 of the device of the present invention, and FIG. 4 is a view of the device in use. An explanatory diagram showing an example. 1... Powder quantitative supply device, 2... Powder introduction part,
3... Hopper, 4... Upper rotary disk, 5... Opening, 6... Rotating shaft, 7... Outer periphery, 8, 11...
Sprocket, 9, 19, 22... Bolt, 10
...Output shaft, 12...Chain, 13,30...Bearing, 14...Boss, 15,31...Support, 1
6, 37... Seal member, 17... Pressing member, 1
8... End cap, 20... End plate, 21... Nut, 23... Scraper, 24
... Measuring chamber, 25 ... Cylindrical body, 26, 43 ... Partition plate, 27 ... Inner cylinder, 28, 39 ... Annular groove, 29
... hole, 32 ... lower pressure means, 33 ... lower rotary disk, 34 ... locking member, 35, 42 ... peripheral wall,
36... Attachment body, 38... Upper compression means, 40,
44...Piping, 41...Powder discharge section, 45...Rigid ball, 46...Coil spring, 47...Spring holder, 4
8...Conveyor conveyor, 49...Slide gate,
50...Two-pronged switching damper, 51...Type-specific hopper, 52...Powder constant supply device, 53...
Two-pronged switching damper, 54... automatic trial penetration device,
55...Mixing screw conveyor, 56...
...Unloading hopper, 57...Hopper scale, 5
8...Breaking conveyor, 59...Bag.

Claims (1)

[Claims for Utility Model Registration] (1) Powder introduced from the powder introduction part 2 is formed by dividing the cylinder 25 radially from the opening 5 of the upper rotary disk 4 which rotates at a predetermined speed. The lower rotary disk 3 rotates in synchronization with the upper rotary disk 4, and the measuring chamber 24 is sequentially filled and weighed.
In the powder quantitative supply device, the measured powder in the measuring chamber 24 is sequentially discharged from the opening or notch 3 to the powder discharge section 41, and the peripheral wall 35 of the powder introduction section 2 A seal member 37 made of a rigid body is provided between the upper rotary disk 4 and the upper rotary disk 4, an upper pressing means 38 is provided for pressing the end face of the seal member 37 against the upper rotary disk 4, and an upper surface of the lower rotary disk 33 made of a rigid body is connected to the measuring chamber 24. A powder quantitative supply characterized in that a lower pressure means 32 is provided for applying pressure to the powder, thereby forming rotary seals between the peripheral wall 35 and the upper rotary disk 4 and between the measuring chamber 24 and the lower rotary disk 33. Device. (2) The driving force for rotating the upper rotary disk 4 is transmitted from the drive source to the outer peripheral portion 7 of the upper rotary disk 4, and the lower rotary disk 33 is arranged with the cylinder body 25 in between. is coaxially connected to the upper rotary disk 4 by a rotating shaft 6, whereby the lower rotary disk 33 is rotated in synchronization with the upper rotary disk 4,
The device according to claim 1, wherein the cylinder body 25 is coaxially supported by the rotating shaft 6 via a bearing 30. (3) A utility model registration request in which the lower rotary disk 33 is formed in a fan shape centered on the rotating shaft 6, and the area of the fan shape is at least large enough to close the lower opening of the measuring chamber 24 during powder measurement. The device according to item 2 of the scope of the invention. (4) The apparatus according to claim 2 or 3 of the utility model registration claim, in which a bypass passage is provided in parallel to the bearing 30 to bypass the powder entering the inside of the bearing 30 from the measuring chamber 24. .