阅读说明：本技术 粉体的分级装置和分级系统 (Powder classifying device and classifying system ) 是由 谢花一成 岸田好雄 三岛刚 于 2018-05-30 设计创作，主要内容包括：本发明提供一种对粉煤灰之类的粉体进行简易分级的分级装置和分级系统。分级装置具有：原粉放出部(6),其将原粉与气体一起放出；以及吸入部(4),其在与所述原粉放出部(6)间隔开的位置与所述原粉放出部(6)相对配置,吸入所述原粉和所述气体的一部分,所述原粉放出部(6)具有：收纳部(2),其具有使所述原粉和所述气体回旋的回旋部(61),在内部收纳所述原粉放出部(6)和所述吸入部(4)并包围外周；以及放出用输送管,其具有将所述收纳部(2)的下方的所述原粉与所述气体一起取入的取入口,并将从该取入口取入到所述原粉放出部(6)的所述原粉和所述气体送出。(The invention provides a classification device and a classification system for simply classifying powder such as fly ash. The classification device has: a raw powder discharging unit (6) that discharges raw powder together with gas; and a suction unit (4) which is disposed opposite to the raw powder discharge unit (6) at a position spaced apart from the raw powder discharge unit (6) and sucks the raw powder and a part of the gas, wherein the raw powder discharge unit (6) includes: a housing section (2) having a swirling section (61) for swirling the raw powder and the gas, housing the raw powder discharge section (6) and the suction section (4) therein, and surrounding the outer periphery thereof; and a delivery pipe for delivering the raw powder and the gas, which has an inlet for taking in the raw powder below the storage unit (2) together with the gas, and which delivers the raw powder and the gas taken in from the inlet to the raw powder delivery unit (6).)

1. A grading apparatus having:

a raw powder supply pipe for carrying and transporting raw powder in an air flow;

a raw powder discharging unit connected to an upper portion of the raw powder supply pipe for the treatment, and configured to discharge the raw powder together with a gas from an upper surface of the opening;

a suction unit that is disposed opposite to an upper surface of the opening of the raw powder discharge unit at a position spaced apart from the raw powder discharge unit, and sucks the raw powder and a part of the gas from a lower surface of the opening; and

a housing part which houses the raw powder discharging part and the suction part inside, surrounds the outer periphery, and accumulates the raw powder during or after classification,

the raw powder discharging part is configured to have a swirling part having a fixed blade inclined in a circumferential direction inside, the raw powder supplied from the raw powder supply pipe in the process is swirled together with the gas by the swirling part, and the raw powder and the gas are radially discharged from an upper surface of the opening in a swirling state,

the suction portion is configured to suck the raw powder that travels while being discharged radially from an upper surface of the opening of the raw powder discharge portion and whirling.

2. The classifying device according to claim 1, wherein the classifying device is configured such that a central axis of the raw powder discharging portion coincides with a central axis of the suction portion.

3. The classifying device according to claim 1 or 2, wherein a distance changing means is provided for changing a distance by fixing the suction portion by changing a relative position with respect to the raw powder discharging portion.

4. A grading system having:

a raw powder bin storing raw powder;

the grading device of claim 1 or 2 or 3;

a raw powder conveying mechanism that conveys the raw powder from the raw powder bin to the classifying device together with gas via a raw powder supply pipe;

a fine powder discharge pipe connected to the suction part of the classifying device; and

and a bag filter for filtering and collecting the fine powder from the gas containing the fine powder discharged from the classifying device through the fine powder discharge pipe.

Technical Field

The present invention relates to a powder classifying device and a classifying system.

Background

Conventionally, a classifying device for classifying a powder into particles having a size according to the application has been proposed.

As one of such classifying devices, a classifier that performs classification by using centrifugal force generated by rotation of a classifying rotor has been proposed (see patent document 1). The classifier is configured such that the introduction direction of the classifying air is opposite to the conventional direction with respect to the rotation direction of the classifying rotor. This makes it possible to obtain a large separating force by applying a rapid change in the flow direction to the inlet of the rotating blade of the classifying rotor, and to perform classification with higher accuracy at a smaller number of revolutions.

Further, a classifier has been proposed which classifies a component supplied to the outer side of a classifying rotor by guiding the powder to the inner side of the classifying rotor based on the relationship between a centrifugal force and a centripetal force (see patent document 2). The classifier is characterized in that each rotating blade of the classifying rotor is arranged in a state of being inclined with respect to the supporting member so that one supporting member side is closer to the rotating direction than the other supporting member side. This can improve the separation performance without increasing the rotational speed of the classifying rotor.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2001-353473

Patent document 2: japanese patent laid-open No. 2005-342556

Disclosure of Invention

Problems to be solved by the invention

However, in the classifier using the classifying rotor, in order to ensure the classifying performance, mechanical strength and driving power for rotating the classifying roller at a certain number of revolutions are required.

The present invention has been made in view of the above problems, and an object thereof is to provide a classifying device and a classifying system for classifying powder with high accuracy by a simple configuration.

Means for solving the problems

The classification device of the present invention is characterized by comprising: a raw powder supply pipe for carrying and transporting raw powder in an air flow; a raw powder discharging unit connected to an upper portion of the raw powder supply pipe for the treatment, and configured to discharge the raw powder together with a gas from an upper surface of the opening; a suction unit that is disposed opposite to an upper surface of the opening of the raw powder discharge unit at a position spaced apart from the raw powder discharge unit, and sucks the raw powder and a part of the gas from a lower surface of the opening; and a housing portion that houses the raw powder discharging portion and the suction portion therein and surrounds an outer periphery thereof, and deposits the raw powder during classification or after classification processing, wherein the raw powder discharging portion has a swirling portion having a fixed blade inclined in a circumferential direction therein, the raw powder supplied from the raw powder supply pipe during processing is swirled together with the gas by the swirling portion, and discharged radially from an upper surface of the opening in a swirling state, and the suction portion is configured to suck the raw powder that travels while being swirled while being discharged radially from the upper surface of the opening of the raw powder discharging portion.

Effects of the invention

According to the present invention, a classification device and a classification system for classifying powder with high accuracy by a simple configuration can be provided.

Drawings

Fig. 1 is an explanatory diagram showing a configuration of a hierarchical system.

Fig. 2 is an explanatory diagram schematically showing the structure of the classifying device.

Fig. 3 is an explanatory view for explaining a structure in the vicinity of the raw powder discharging portion of the classifying device.

Fig. 4 is an explanatory view for explaining the operation at the time of raw powder supply and at the time of pulverization and classification.

Fig. 5 is an explanatory view schematically showing a classification in crushing classification in a case where the position of the suction portion is changed.

Detailed Description

An embodiment of the present invention will be described below with reference to the drawings.