JPH07133028A - Quantitaive transferring device for grain - Google Patents

Abstract

PURPOSE:To enable grains to be transferred quantitatively by dropping the grains in a hopper into an pipe by their own weight, so as to discharge them through an outer pipe through a process of operating an actuator and lowering a scraper together with an inner pipe while rotating them at the specific speed. CONSTITUTION:An inner pipe 31 is inserted in the axial direction from the lower part of a sealing-system hopper 11 wherein a grain input port 14 is provided on the upper part, and the upper end extended in the hopper 11, and the intermediate part and the lower end are taken out to the lower part of the hopper 11. A scraper 41 is attached to the upper end of the inner pipe 31, and this inner pipe 31 is raised and lowered by being rotated by an actuator 51 connected to the intermediate part at the specific speed, and the lower end of this inner pipe 31 is inserted into the outer pipe 21. The clearance between the hopper 11 and the inner pipe 31 is sealed by a seat means 61. And the grains are dropped into the inner part 31 by rotating and lowering the inner pipe 31 and the scraper 41, so as to be discharged through the outer pipe 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quantitative transfer device for powder particles. In the industry of foods, pharmaceuticals, new materials, etc. that handle powders and granules, the powders and granules are quantitatively supplied or pulverized, dried, granulated, mixed, molded, reacted, packaged, etc. Discharging is done. TECHNICAL FIELD The present invention relates to a quantitative transfer device for powder and granules capable of continuously and quantitatively supplying or discharging the powder and granules.

[0002]

2. Description of the Related Art Conventionally, a rotary feeder, a table feeder, a belt feeder, a screw feeder and the like have been used as a quantitative transfer device for powder and granular material. However, these conventional devices have a drawback in that their quantitativeness is poor due to their structure.

[0003] Therefore, conventionally, as a quantitative transfer device for powders and granules, the powders and granules are fluidized in a closed container, and the powders and granules are discharged from a discharge pipe mounted in the height of the fluidized bed through a throttle valve. A device which is constructed so as to be discharged is proposed (Japanese Patent Laid-Open No. 63-267613). However, in this conventional device,
There are drawbacks in that the granular material causes a crosslinking phenomenon at the throttle valve portion to prevent the fixed amount discharge, and the granular material is often clogged at the throttle valve portion.

Conventionally, as a quantitative transfer device for powder and granular materials,
By blowing a gas from the upper end opening of the air feeding pipe while lowering the air feeding pipe provided in the housing pipe at a constant speed, the upper end opening of the storing pipe together with the gas in which the granular material loaded in the housing pipe is blown It has been proposed to discharge it from the above (JP-A-4-334538). However, in the case of this conventional device, it is necessary to blow a considerable amount of gas into the storage pipe in order to raise the powdery particles while floating in the storage pipe and to discharge the powdery substance from the upper end opening of the storage pipe. Even if the diameter of the storage pipe is increased and a large amount of powdery or granular material is stored in the storage pipe at one time, it is necessary to blow a huge amount of gas corresponding to the diameter of the storage pipe into the storage pipe. Inevitably, the diameter of the air supply pipe will increase accordingly, and the amount of powder that can be stored originally only between the storage pipe and the air supply pipe will not increase so much as a result. There is also a limit to enlarging the diameter of the pipe and storing a large amount of powdery particles in the storage pipe at one time,
Therefore, there is a disadvantage in that the powder cannot be quantitatively transferred continuously for a long time.

[0005]

The problem to be solved by the present invention is that the conventional quantitative transfer device is inferior in its quantitative property, particularly continuous quantitative property, or the powdery or granular material is continuously maintained for a long time. It is impossible to transfer quantitatively.

[0006]

DISCLOSURE OF THE INVENTION The present invention, however, has a closed system hopper having an inner peripheral surface formed in a flat circular shape, and a hopper which is inserted from the lower portion of the hopper in the axial direction thereof, and the upper end portion of which is the hopper. Inside pipe, the middle part and the lower end part of which are taken out to the lower part of the hopper, the scraper attached to the upper end part of the inner pipe, and the scraper attached to the middle part of the inner pipe. An actuator for rotating the inner pipe while rotating it at a constant speed, an outer pipe connected to the lower end of the inner pipe for accommodating the lower end, and a sealing means for sealing between the hopper and the inner pipe. The present invention relates to a fixed-quantity transfer device for powder and granules, which is characterized by comprising.

In the present invention, the quantitative transfer device is provided with a closed system hopper having an inner peripheral surface formed in a flat circular shape. An inner pipe is inserted in the axial direction from the lower part of the hopper.

The upper end of the inner pipe is taken out to the inside of the hopper, and the middle part and the lower end of the inner pipe are taken to the lower part of the hopper. A scraper is attached to the upper end of the inner pipe, and an actuator for moving the inner pipe up and down while rotating the inner pipe at a constant speed is attached to the middle part of the inner pipe. An outer pipe for housing the lower end is connected to the.

The actuator comprises a rotating machine for rotating the inner pipe and an elevating machine for raising and lowering the inner pipe. As the rotating machine, a commercially available geared motor having a cylindrical rotating shaft can be used. As the elevator, a commercially available LM system K series manufactured by THK can be used. Such an elevator generally has a drive motor, a ball screw connected to the drive motor, and an elevating member screwed onto the ball screw and engaged with the guide rail. In the present invention, the middle portion of the inner pipe is attached to the tubular rotary shaft of the geared motor,
The geared motor is attached to an elevating member of an elevator, and the inner pipe is rotated while being rotated at a constant speed by the rotation of the geared motor and the rotation of the drive motor of the elevator.

As the scraper, a plate-like piece or a curved piece whose lower end surface is inclined upward can be used, but the elevation angle of the lower end surface is smaller than the repose angle of the powder or granules loaded in the hopper. It is preferable that the tip of the lower end surface extends to a position close to the inner peripheral surface of the hopper.

The scraper is for scraping the powder particles loaded in the hopper to the axial portion, and thus to the drop opening of the internal pipe arranged at the axial portion, by rotating the scraper together with the internal pipe. belongs to. A baffle is preferably attached to the upper end of the inner pipe above the scraper. This is because the powder or granules newly introduced into the hopper are uniformly dispersed in the hopper by rotating the baffle together with the inner pipe.

The hopper and the inner pipe are usually sealed immediately below the hopper, and preferably the outer pipe and the inner pipe are also usually sealed at the upper end of the outer pipe.

[0013]

Operation: The actuator is operated to lower the scraper together with the inner pipe while rotating the scraper at a constant speed. The powders and granules loaded in the hopper are sequentially scraped by the upper end drop opening of the inner pipe while falling in the inner pipe by its own weight,
It is discharged through the outer pipe. The transfer amount of the granular material can be controlled by adjusting the operation of the actuator, that is, by adjusting the rotation speed and the descending speed of the inner pipe and the scraper.

According to the present invention, since there is no throttle valve, the granular material does not cause a bridging phenomenon or clogging in the throttle valve portion. Therefore, the granular material can be continuously quantitatively transferred. Further, since the powder or granules in the hopper are dropped by its own weight, it is not necessary to blow gas into the hopper, and the hopper can be set to an arbitrary size. Therefore, the hopper can be loaded with a large amount of powder or granules at once. The powder and granules can be continuously quantitatively transferred for a long time.

[0015]

1 is a vertical sectional view schematically showing an embodiment of the present invention. The hopper 11 is composed of a main body 12 and a lid 13 attached to the main body 12, and the inner peripheral surfaces of the main body 12 and the lid 13 are formed in a plane circular shape having the same central axis,
The lid 13 has an opening 14 for the powder A.
An inner pipe 31 is inserted from the lower portion of the main body 12 in the axial direction of the hopper 11, an upper end portion of the inner pipe 31 is taken out into the hopper 11, and an intermediate portion and a lower end portion of the inner pipe 31 are in the hopper 11. Has been taken out to the bottom of.

At the upper end portion of the inner pipe 31, the lower end surface is inclined upward at an elevation angle smaller than the repose angle of the granular material A, and the tip end of the lower end surface is close to the inner peripheral surface of the hopper 11. A plate-shaped scraper 41 extending up to is attached to the scraper 41, and a conical baffle 42 is attached to the upper portion of the scraper 41, and a drop port 32 is opened in the attachment portion of the scraper 41.

An actuator 51 is attached to the middle portion of the inner pipe 31. The actuator 51 includes a geared motor 54 for rotating the inner pipe 31 and an elevator for raising and lowering the inner pipe 31. The elevator includes a DC servo motor 52, a ball screw (not shown) connected to the DC servo motor 52, and an elevator member 53 screwed to the ball screw and engaged with a guide rail (not shown). The middle portion of the inner pipe 31 is attached to the tubular rotation shaft of the geared motor 54, and the geared motor 54 is attached to the elevating member 53 of the elevator. The outer pipe 21 that accommodates the lower end is connected to the lower end of the inner pipe 31.

A space between the hopper 11 and the inner pipe 31 is sealed by a sealing means 61 immediately below the hopper 11, and a space between the outer pipe 21 and the inner pipe 31 is similarly sealed at the upper end of the outer pipe 21. Has been done. The sealing means 61 is of a known type, and has a cylindrical bearing attached to the inner peripheral surface of a short pipe vertically extending from the hopper 11 and the inner pipe 31 attached to the inner peripheral surface of the bearing. And a plurality of O-rings that are in sliding contact with the outer periphery of the.

Although not shown, a small amount of gas can be blown into the hopper so that not only its own weight but also the blown gas can be entrained and dropped, and a jacket through which a heat medium can flow through the hopper. It is possible to heat or cool the powder or granular material by surrounding it, and it is also possible to receive the hopper by, for example, a load cell and control the operation of the actuator by changing its weight.

[0020]

As is apparent from the above, the present invention described above has an effect that powder particles can be continuously quantitatively transferred, and that the powder particles can be continuously quantitatively transferred for a long time. Moreover, there is an effect that the maintenance including the cleaning is easy.

[Brief description of drawings]

FIG. 1 is a vertical sectional view schematically showing an embodiment of the present invention.

[Explanation of symbols]

11 ... Hopper, 21 ... Outer pipe, 31 ...
Inner pipe, 41 ... scraper, 42 ... baffle, 51 ... actuator, 61 ... sealing means

Claims (2)

[Claims] 1. A closed system hopper having an inner peripheral surface formed in a plane circular shape, and an axially inserted hopper from a lower portion of the hopper, an upper end portion of which is taken out into the hopper.
Rotate the inner pipe whose middle and lower ends are taken out to the lower part of the hopper, the scraper attached to the upper end of the inner pipe, and the inner pipe attached to the middle part of the inner pipe at a constant speed. And an outer pipe connected to the lower end of the inner pipe for accommodating the lower end, and a sealing means for sealing between the hopper and the inner pipe. Quantitative transfer device for powder and granular material. 2. The quantitative transfer device for powdery particles according to claim 1, wherein a baffle is attached to the upper end of the inner pipe above the scraper.