JPH056499Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is applicable to the manufacturing fields of food, chemicals, feed, etc., where the surrounding environment is A weighing machine that is used under conditions where dust is generated.More specifically, it is a weighing machine that has a powder supply port above the scale that supplies powder and granules into a measuring container on the scale. This invention relates to a dust collector in a certain weighing machine for powder and granular materials.

[Conventional technology]

Conventionally, in the dust collector of this type of powder weighing machine, the suction port of the dust collection duct faces a location near the powder supply port and the weighing device, or the powder A dust-proof cover was provided to cover the body supply port and the measuring instrument, and the suction port of the dust collection duct was connected to this dust-proof cover (I cannot provide any literature).

[Problem that the invention attempts to solve]

However, in the former case, when the suction force of the suction port of the dust collection duct is strengthened, not only the dust generated around the powder supply port and the measuring instrument but also the dust falling from the powder supply port is supplied. Some of the powder particles may also be sucked in, and
There was a problem in which the airflow acting on the measuring device had a negative effect on measuring accuracy. Conversely, if the suction force from the dust collection duct suction port is weakened,
There was a problem in that the dust collection effect at locations other than the vicinity of the suction port was extremely reduced.

In addition, in the case of the conventional latter method, although it is possible to efficiently suction the dust generated around the powder supply port and the measuring instrument, it is also possible to efficiently suck out the dust generated around the powder supply port and the measuring instrument. Since the weighing container must be taken out, it is difficult to handle it, and furthermore, lumps of dust that have grown on the inner surface of the dustproof cover may unexpectedly fall into the weighing container and cause the product to be weighed. There was a problem that made it useless.

The purpose of this invention is to make it possible to easily perform various settings in the weighing section and take out the weighing container, while also reducing the dust generated around the weighing instrument and the powder supply port to improve measurement accuracy and powder particles. The purpose is to enable efficient removal without adversely affecting the body's fall supply.

[Means for solving problems]

The dust collecting device in the weighing machine for powder and granular material according to the present invention is arranged such that the measuring instrument and the powder and granular material are supplied to one of a floor section on which the weighing instrument is placed and a ceiling section vertically opposed to the floor section. It is characterized by forming a substantially annular outlet that blows out airflow surrounding the mouth, and on the other hand, forming a suction port that sucks the airflow blown out from the outlet. Yes, and its effects and effects are as follows.

[Effect]

The airflow blown out from the annular outlet formed in the ceiling or floor flows around the powder supply port and the measuring instrument, and is sucked into the suction port formed in the floor or ceiling. be done. At this time, the dust generated as the powder and granular material falls and is supplied from the powder supply port into the measuring container rides on the flow of airflow that flows around the generation location, and moves from the suction port to a predetermined location along with the airflow. is removed by suction.

[Effect of idea]

Therefore, the dust generated as the powder and granules are dropped into the measuring container from the powder supply port is isolated from the outside by the airflow layer around the place where the dust is generated, and
Since the dust is suctioned and removed from the suction port along with the airflow, the dust does not spread to the outside or is very small, and furthermore, the airflow surrounds the measuring device and the powder supply port. The influence of the air current on the measuring device is reduced, and it is possible to satisfactorily suppress the intake of part of the powder and granular material that is dropped and supplied from the granular material supply port. Therefore, it is possible to efficiently remove the dust generated during the falling supply of powder and granular material without adversely affecting the measurement accuracy and the falling supply of powder and granular material.

Furthermore, by stopping or weakening the airflow from the air outlet, various settings in the measuring section and taking out of the measuring container can be carried out freely without being obstructed by other objects, compared to conventional methods. While achieving high dust collection efficiency, we were able to perform various tasks related to weighing efficiently and easily.

〔Example〕

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

The weighing machine shown in FIG.
A granular material supply port 3a of a hopper 3 is disposed therein to drop and supply granular material.

In the dust collector equipped with this weighing machine, an airflow blowing duct 5 connected to a blower 4 is arranged in the ceiling located directly above the powder supply port 3a of the weighing machine 1 and the hopper 3. At the same time, a dust collection duct 7 is provided with a mounting surface a for the measuring instrument 1 on the floor and is connected to a dust collector 6 having a well-known structure.
It is configured by arranging.

On the lower surface of the airflow blowing duct 5, there is an annular blowout port 8 that blows out airflow surrounding the measuring device 1 and the powder supply port 3a, and a small amount of An auxiliary air outlet 9a is provided to blow out the airflow downward.

This auxiliary air outlet 9a is composed of a group of small holes in the porous plate 9.

Further, a partition plate 12 is provided inside the airflow blowing duct 5 to partition a first airflow supply path 10 to the airflow outlet 8 and a second airflow supply path 11 to the porous plate 9. At the same time, a honeycomb 13, which is an example of an airflow rectifying member, is provided on the back side of the air outlet 8.

The air outlet 8 is provided on the upper surface of the dust collection duct 7.
An annular suction port 14 that sucks the airflow blown from the granular material supply port 3a, the measuring container 2, and the measuring device 1 and flowing down through the outer peripheral portions of the powder supply port 3a, the measuring container 2, and the measuring device 1; A cylindrical windshield plate 15 that protrudes and covers the periphery of the windshield 1 is provided.

Further, in the dust collection duct 7, an annular flow path 17 having a substantially dogleg shape in cross section is formed for making the airflow sucked from the suction port 14 merge into the collecting flow path 16. , the annular flow path 17
A honeycomb 18 is provided with a length extending to the bent portion of the honeycomb.

This honeycomb 18 is for suppressing the short-circuit flow of the suction airflow so that a substantially equal suction force acts on the entire suction port 14.

Furthermore, the amount of air taken in per unit time by the suction port 14 is configured to be larger than the amount of air blown out per unit time from the outlet 8.

In the dust collector configured as described above,
When the blower 4 and dust collector 6 are driven, the airflow generated by the blower 4 flows into the airflow blowing duct 5.
The air is blown out from the air outlet 8 through the first air flow supply passage 10 . This blown airflow flows downward surrounding the powder supply port 3a of the hopper 3, the measuring container 2, and the measuring instrument 1, and then is sucked from the suction port 14 of the dust collection duct 7, It is led to the dust collector 6 through the annular flow path 17 and the collecting flow path 16.

At this time, from the powder supply port 3a to the measuring container 2,
The dust generated as the powder and granular material is dropped into the interior moves along with the airflow flowing around the area where the dust is generated, and is sucked together with the airflow from the suction port 14. It is separated from the airflow and collected using a dust removal filter.

Further, a part of the airflow generated by the blower 4 is transferred to the second airflow supply passage 11 of the airflow blowing duct 5.
A small amount of air is blown out from the group of auxiliary air outlets 9a of the porous plate 9 through the air. This small amount of airflow causes
It is possible to prevent dust from adhering to and growing on the ceiling. Further, this small amount of airflow that is blown out flows along with the dust in the direction of being pulled by the surrounding airflow, and is eventually sucked in from the suction port 14 by riding on the surrounding airflow.

Further, a windshield plate 1 provided on the outer periphery of the measuring instrument 1
5 makes it possible to suppress the adverse effect on the measuring instrument 1 due to the curling up of the airflow at the floor portion.

In addition, the airflow at the sensing part of the measuring instrument 1 generated as the airflow is blown out from the airflow outlet 8 is 0.5m/
It is preferable to set the distance between the air outlet 8 and the sensing part of the measuring instrument 1 so that the distance is less than or equal to s.

Next, another example will be described.

In the above-mentioned embodiment, a honeycomb 13 for airflow rectification was provided on the back side of the air outlet 8, and the airflow was blown out with the airflow directed directly below. However, as shown in FIG. When a narrow airflow blowing duct 5 is disposed directly above the supply port 3a, the airflow supply passage 10 to the blowout port 8 is formed in a conical shape, and the airflow is directed outward and diagonally downward. It is preferable to configure it so that it blows out towards the front.

In addition, as shown in Fig. 3, there is an air outlet 8 on the floor.
In addition, the suction port 14 may be formed in the ceiling.

Further, in the above-described embodiment, a honeycomb is used as the air flow regulating member 13, but other air flow regulating members such as punched metal may be used.

Furthermore, the structures of the ceiling and floor sections on which the air outlet 8 and the suction port 14 are provided can be modified in various ways.

Furthermore, in the above-described embodiment, the air outlet 8 is formed in an annular shape, but a group of small holes or long holes such as arcuate or rectangular holes may be arranged in an annular shape. In short, the air outlet 8 may have any shape as long as it is substantially annular.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing an embodiment of a dust collector in a powder weighing machine according to the present invention, and FIGS. 2 and 3 are overall schematic diagrams showing different embodiments. be. 1... Measuring machine, 2... Measuring container, 3a... Powder supply port, 8... Air outlet, 9a... Auxiliary air outlet,
13...Air flow rectification member, 14...Suction port, 15...
...Windshield board.

Claims (1)

[Claims for Utility Model Registration] 1. Powder supply port 3 above the measuring instrument 1 for supplying powder and granular material by dropping it into the measuring container 2 on the measuring instrument 1.
A is a dust collection device for a weighing machine for powder and granular materials, in which the measuring device 1 is disposed on one of a floor section on which the measuring instrument 1 is placed and a ceiling section facing vertically opposite thereto. A substantially annular air outlet 8 for blowing out an air flow is formed surrounding the measuring device 1 and the powder supply port 3a, and on the other hand,
A dust collecting device for a weighing machine for powder and granular materials, which is formed with a suction port 14 for sucking the airflow blown out from the blowout port 8. 2. The dust collector for a powder or granular material weighing machine according to claim 1, wherein the floor portion is provided with a windshield plate 15 that covers the periphery of the measuring instrument 1. 3. The metering method for powder and granular material according to claim 1, wherein the amount of air taken in per unit time by the suction port 14 is larger than the amount of air blown out per unit time from the outlet 8. Dust collector in machine. 4. The dust collection device for a powder weighing machine according to claim 1, wherein the air outlet 8 is provided with an airflow rectifying member 13. 5. The utility model registration according to claim 1, wherein the ceiling portion is provided with an annular air outlet 8 and an auxiliary air outlet 9a that blows out a small amount of airflow in the central part surrounded by the air outlet 8. Dust collector for powder weighing machines.