JP2003053269A - Classifier for fine particle of crushed sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a classifier for fine particles of crushed sand capable of reducing the economic liability of the device and improving the operating efficiency by adding a sieving function which mainly aims at the removal of fine particles, etc., contained in crushed sand and at the same time, can remove oversize materials. SOLUTION: In this classifier for fine particles of crushed sand, a sieve net 80, which is a netlike body separated from a classifying surface 3, is attached to the tip part of the lowest receiving plate 32 so as to be arranged in a crushed sand discharge chamber 8, and a crushed sand taking-out port 9 is divided into an undersize material taking-out port 91 formed under the sieve net and an oversize material taking-out port 92 formed ahead of and under the sieve net.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a classifier used in a dry sand making facility, which is capable of using crushed sand crushed by a crusher as concrete crushed sand specified in JIS standard for concrete aggregate. The present invention relates to a crushed sand fine powder classifier capable of removing fragile portions, impurities and the like (hereinafter referred to as fine powder).

[0002]

2. Description of the Related Art Today, it becomes increasingly difficult to collect natural sand such as mountain sand and sea sand, and demand for crushed sand as an aggregate to replace natural sand is increasing. Dry sand making equipment requires excessive capital investment such as a crusher, a sorter, a classifier, a dust collecting equipment, a transportation equipment, an electric power equipment for driving the machine and an operation panel. In addition, since wet-type sand making equipment requires additional sewage treatment equipment, it has an adverse effect on the spread of crushed sand. In particular, in order to use crushed sand as an aggregate for concrete, it is at least necessary to meet the crushed sand particle size specified by the JIS standard and the washing test conditions.
Crushed sand producers are required to produce crushed sand with even better properties.

The applicant of the present invention has studied the simplification and rationalization of the equipment of a crushed sand fine powder classifier, and has filed Japanese Patent Application No. 2000-32393.
No. 3 and Japanese Patent Application No. 2000-323935 have already proposed a new crushed sand fine powder classifier.

[0004]

In the invention of Japanese Patent Application No. 2000-323933 as a prior art, when the raw material crushed sand moves from the top to the bottom on the classification surface by the vibration of the vibration exciter, each receiving plate Air is blown into the classification chamber through the air inflow path formed between them. Then, the fine powder and the like blown into the classification chamber in this way is collected together with the air from the exhaust port to a dust collector such as a bag filter, and collected and collected. It is designed to be dropped from the crushed sand extraction port.

By the way, in a general dry sand making facility, a crusher is provided after the crusher to screen out oversize. After that, it passes through a classifier to remove fine powder, but if the oversize is relatively small and the total amount is not large, it is uneconomical to install separate sieving and classifying equipment. There are many things. In this regard, the above-mentioned prior art crushed sand fine powder classifier,
It mainly had a classification function for removing fine powder contained in crushed sand, and did not have a sieving function for the purpose of removing oversize.

[0006] The present invention has been made in view of the above points. The main purpose of the present invention is to remove fine powder and the like contained in crushed sand, instead of separately providing facilities of a sieving machine and a classifier,
At the same time, it is an object of the present invention to provide a crushed sand fine powder classifier capable of reducing the economic burden on equipment and improving work efficiency by adding a sieving function capable of removing oversize.

[0007]

In order to solve the above-mentioned problems, the crushed sand fine powder classifier (Claim 1) of the present invention comprises a vibrating means for vibrating a main body elastically supported by a spring and an inside of the main body. A plurality of receiving plates are arranged in a staircase, and the classification surface is formed so as to move the crushed sand from the upper level to the lower level, and one end of the main body for supplying the raw crushed sand to the upper end of the classification surface. The crushed sand input port formed in, and the crushed sand discharge chamber formed at the other end of the main body so as to take out the classified crushed sand from the lower end of the classification surface, and the main body formed so as to open below this crushed sand discharge chamber. Crushed sand outlet, a classification chamber formed on the upper side of the classification surface, an exhaust port formed on the main body so as to open above the classification chamber, an air inflow chamber formed on the lower surface side of the classification surface, An empty space formed in the main body to open into this air inflow chamber. An intake port, a net-like member extending from the tip of each of the receiving plates in the moving direction of the crushed sand, and a space between the receiving plates so that the air-inflow chamber opens below the net-like member and communicates with the classification chamber. In the crushed sand fine powder classifier equipped with the air inflow path formed in the above, the sieving which is a reticulated body different from the classification surface is provided at the tip of the bottom receiving plate so that it is placed in the crushed sand discharge chamber. The mesh is installed so as to be horizontal or downwardly inclined, and the crushed sand extraction port is an undersize extraction port formed in the lower part of the sieving mesh and an oversize extraction port formed in the lower front part of the sieving mesh. The structure is divided into.

In the crushed sand fine powder classifier of the present invention, the baffle plate is divided into a plurality of classifying chambers so that the baffle plate is directed vertically downward from the upper surface of the main body and does not come into contact with crushed sand moving on the classifying surface. Is provided vertically, and an exhaust port is formed in each classification small chamber (claim 2).

Further, in the crushed sand fine powder classifier of the present invention, the boundary between the classification chamber and the crushed sand discharge chamber is directed vertically downward from the upper surface of the main body so that it does not come into contact with the crushed sand moving on the classification surface. There is a mode (claim 3) in which the baffle plate is vertically installed.

Further, in the crushed sand fine powder classifier of the present invention, the classifying chamber is divided into a plurality of classifying small chambers in a range that does not come into contact with the crushed sand moving on the classifying surface from the upper surface of the main body substantially vertically downward. A baffle plate is installed vertically, and an exhaust port is formed in each classifying chamber, and at the boundary between the classifying chamber and the crushed sand discharge chamber, the crushed sand moves on the classification surface from the upper surface of the main body to a position almost vertically downward. There is a mode (claim 4) in which the baffle plate is vertically installed within a range in which the baffle plate does not come into contact with.

Further, in the crushed sand fine powder classifier of the present invention, there is a mode in which the lower end of the baffle plate is bent toward the crushed sand inlet side in a range from vertical to substantially horizontal (claim 5).

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. The specific configuration of the present invention is not limited to the following embodiments.

FIG. 1 is a sectional view of a crushed sand fine powder classifier which is a first embodiment of the present invention. In the figure, 1 is a main body,
It is formed in a box body having an inclined space formed therein, and is elastically supported by a spring (not shown). A vibrator 2 as a vibrating unit is connected to the lower surface of the main body 1. The vibration exciter 2 is attached so that the vibration direction B thereof is inclined in the moving direction of the crushed sand (the direction of arrow A) so as to pass through substantially the center of gravity of the main body 1 and the vibration exciter 2.

Inside the main body 1, a plurality of receiving plates 30 are arranged in a step-like manner so that the crushed sand is moved from the top to the bottom (in the direction of arrow A) by the vibration of the vibrator 2. The classified surface 3 is formed.

A classification chamber 4 is formed on the upper surface side of the classification surface 3 and an air inflow chamber 5 is formed on the back surface side of the classification surface 3 so that the air inflow chamber 5 communicates with the classification chamber 4. An air inflow passage 31 is formed between the receiving plates 30, 30. A net-like body 32 is provided at the tip of each receiving plate 30 so as to extend in the moving direction of the crushed sand.
Are formed so as to open below the mesh body 32.

Further, a crushed sand input port 60 is formed at the upper end of the main body 1, and the raw material crushed sand S1 charged from the crushed sand input port 60 is supplied to the upper end of the classification surface 3 via the guide plate 61. It is like this.

An air intake 70 is formed on the upper end surface of the main body 1 so as to open into the air inflow chamber 5. An airflow direction adjusting plate 71 is provided above the air intake 70, and the direction of the air flowing into the air inflow chamber 5 can be adjusted by the airflow direction adjusting plate 71.

The classifying chamber 4 is divided into a plurality (two in the embodiment) of classifying small chambers 4a, 4a so that the classifying chamber 4 is divided into a plurality of classifying chambers 4 from the upper surface of the main body 1 substantially vertically downward. The first baffle plate 40 is vertically installed in such a range that it does not come into contact with the crushed sand moving above. Two classification chambers 4a partitioned by the first baffle plate 40,
Exhaust ports 41, 41 are formed in the upper surface 4a of the main body 1 respectively. In the present invention,
The classification chamber 4 may be divided into two or more classification small chambers by a plurality of baffle plates.

Further, a crushed sand discharge chamber 8 is formed at the lower end of the main body 1, and the classification surface 3 is provided at the tip of the lowermost receiving plate 32 so as to be arranged in the crushed sand discharge chamber 8. Another mesh-like body, a sieving net 80, is attached so as to have a downward slope (may be horizontal). In addition, this sieving net 80 is
It extends from the lowermost receiving plate 32 and is attached to a sieve frame 82 supported by guide rollers 81.
A crushed sand outlet 9 is formed below the crushed sand discharge chamber 8. The crushed sand outlet 9 is an undersize outlet 91 formed at a lower portion of the sieving net 80 and the end of the sieving net 80. It is partitioned into an oversize outlet 92 formed in the lower portion. Therefore, the classified crushed sand that has moved on the classification surface 3 is transferred from the lower end portion of the classification surface 3 onto the sieving net 80, and the sieving net 80 causes the crushed sand to have an undersize smaller than the predetermined mesh size. And the oversized crushed sand are sieved, and the undersized crushed sand S2 is sieved 8
After passing through 0, the oversized crushed sand S3 is taken out from the lower undersize outlet 91, moves over the sieving net 80, and is taken out from the former oversize outlet 92.

At the boundary between the crushed sand discharge chamber 8 and the classification chamber 4, a second baffle is provided in a range from the upper surface of the main body 1 to a position right below the crushed sand, which does not come into contact with the crushed sand moving on the classification surface 3. The plate 85 is vertically installed.

At the lower ends of the first baffle plate 40 and the second baffle plate 85, bent portions 42, 86 bent at an angle of about 45 ° toward the crushed sand inlet 60 are formed.

Next, the operation of this crushed sand fine powder classifier will be described. The raw material crushed sand S1 charged from the crushed sand charging port 60 is supplied to the upper end portion of the classification surface 3 via the guide plate 61, and is moved from the top to the bottom on the classification surface 3 by the vibration of the vibrator 2.

When moving on the classification surface 3, each receiving plate 3
Since the net-like body 32 is provided extending from the tip end of 0 in the moving direction of the crushed sand, the crushed sand moving on the classification surface 3 is continuously moved from the receiving plate 30 onto the net-like body 32, and It can be evenly dispersed while being loosened on the plate 30 and the mesh 32. Then, air is supplied from the air intake port 70 into the air inflow chamber 5 by the blower, and this air is blown out into the classification chamber 4 through the air inflow passage 31 formed between the receiving plates 30 and 30. At this time, the air inflow path 3
Since 1 is opened below the mesh body 32 and communicates with the classification chamber 4, the air blown out from the air inflow path 31 is blown toward the inside of the classification chamber 4 from below the mesh body 32. In this way, since air is blown from below against the crushed sand dispersed on the mesh body 32, the fine powder and the like contained in the crushed sand can be efficiently blown off in the classification chamber 4, resulting in high efficiency. Can classify.

In this case, since there is a step between the air inflow passages 31 formed between the receiving plates 30 and 30, the airflows flowing into the classification chamber 4 from there are slightly different. These interfere with each other, and as a result, turbulence occurs in the airflow, leading to a reduction in classification efficiency. There is also a problem that the larger the volume of the classification chamber is, the more the diffusion turbulence of the air flow itself is increased, and the pressure loss of the dust collector for suction and the blower for air supply is increased.

To solve the above problem, when the first baffle plate 40 is provided in the classification chamber 4 as in this embodiment,
You can limit the number of interfering airflows,
Since the classifying chamber 4 can be partitioned into a plurality of classifying small chambers 4a, 4a by the first baffle plate 40, diffusion turbulence of the air flow can be prevented, which allows efficient air circulation and improves classification efficiency. To do. In addition, each classification small room 4
Since the exhaust port 41 is formed for each a, the exhaust port 41
It is relatively easy to adjust the air flow rate for each unit, which is advantageous for the actual construction and adjustment of equipment.

Further, since the second baffle plate 85 is also provided at the boundary between the classification chamber 4 and the crushed sand discharge chamber 8, the air flow does not go to the crushed sand discharge chamber 8 but bounces off at the second baffle plate 85 and the exhaust port 41 Head to. Furthermore, once the airflow bounces off the second baffle plate 85, even if a slightly larger particle of crushed sand is mixed in the airflow, the particle contacts the second baffle plate 85 and falls onto the classification surface 3. As a result, the particles can be prevented from reaching the exhaust port 41, and the classification efficiency can be further improved.

Further, the first baffle plate 40 and the second baffle plate 40
Since the lower end of the baffle plate 85 is close to the classification surface 3 to the extent that it does not interfere with the movement of the crushed sand, it is possible to restrict the inflow of air from a portion other than the air inflow path, such as the crushed sand outlet 9. The airflow is adjusted so that it enters from the air inflow path 31 and exits from the exhaust port 41 in a state close to the ideal. This has the effect that the air entering from the air inflow passage 31 more effectively diffuses the crushed sand and scatters fine powder into the air.

The first baffle plate 40 and the second baffle plate 40
Since the bent portions 42 and 86 are formed at the lower end of the baffle plate 85, a smoother airflow can be formed and turbulence can be further prevented.

The fine powder S4 blown into the classifying chamber 4 as described above is collected together with air from the exhaust port 41 to a dust collector (not shown) such as a bag filter to be collected and collected. Also, the classified crushed sand from which fine powder etc. have been removed is
From the lower end of the classification surface 3 is transferred onto the sieving net 80,
The sieving net 80 screens crushed sand of undersize and oversize crushed sand smaller than a predetermined mesh size, and the undersize crushed sand S2 passes through the sieving net 80 and is taken out from an undersize outlet 91 below. Then, the oversized crushed sand S3 moves on the sieving net 80 and is taken out from the oversize unloading port 92 of the other side, whereby the oversized crushed sand S3 is prevented from being mixed into the crushed sand having a predetermined mesh size or less. Can be prevented.

[0030]

As described above, in the crushed sand fine powder classifier of the present invention, the crushed sand is evenly dispersed while being unraveled on the receiving plate and the mesh body, and then blown out from the air inflow path. Air can be blown into the classification chamber from below the mesh. In this way, to blow air from below against the crushed sand dispersed on the mesh,
The fine powder contained in the crushed sand can be efficiently blown out in the classification chamber, and the classification can be performed with high efficiency.

Further, since a sieving net, which is a reticulated body different from the classification surface, is attached to the tip of the bottom receiving plate (Claim 1), removal of fine powder contained in the crushed sand is mainly performed. Although it is a purpose, it becomes a crushed sand fine powder classifier with a sieving function that can remove oversize at the same time, which greatly reduces the equipment cost compared to the case where the sieving machine and classifier equipment are provided separately. The burden can be reduced and the work efficiency can be improved.

Further, since the baffle plate is vertically installed so as to divide the classification chamber into a plurality of classification small chambers (Claim 2), the number of interfering airflows can be limited, and the diffusion turbulence of the airflows can be limited. Can be prevented, which enables efficient air circulation and improves classification efficiency. Further, since the exhaust port is formed for each classifying small chamber, it becomes relatively easy to adjust the air flow rate for each exhaust port, which is advantageous for the actual construction and adjustment of the equipment.

Further, since a baffle plate is also provided at the boundary between the classification chamber and the crushed sand discharge chamber (claim 3), the air flow bounces off the baffle plate, and fine powder and the like can be guided to the exhaust port. Even if a little larger particles of crushed sand are mixed in, the particles can be dropped to the classification surface by the baffle plate, suppressing the particles from reaching the exhaust port and further improving the classification efficiency. be able to.

Further, since the lower end of the baffle plate is near the classification surface to the extent that it does not interfere with the movement of the crushed sand, it is possible to restrict the inflow of air from a portion other than the air inflow path such as the crushed sand outlet. The airflow can be rectified so that it enters from the air inflow path and exits from the exhaust port in a state close to ideal, which effectively diffuses the crushed sand with the air entering from the air inflow path to generate fine powder. Can be scattered in the air.

Further, since the bent portions are formed at the lower ends of the first baffle plate and the second baffle plate (claim 5), a smoother air flow can be formed and turbulent flow can be prevented. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a crushed sand fine powder classifier that is a first embodiment of the present invention.

[Explanation of symbols]

1 body 2 shaker 3 classification plane 30 support plate 31 Air inflow path 32 support plate 32 mesh 4 classification room 4a Classroom 40 First Baffle Plate 41 Exhaust port 42 Bend 5 Air inflow chamber 60 Crushed sand input port 61 Guide plate 70 Air intake 71 Wind direction adjustment plate 8 Crushed sand discharge chamber 80 sieving mesh 81 Guide roller 82 sieve frame 85 Second Baffle Plate 86 Bend 9 Crushed sand outlet 91 Undersize outlet 92 Oversize outlet S1 raw material crushed sand S2 undersize crushed sand S3 Oversized crushed sand S4 fine powder, etc.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenichiro Dan             1 of 2246, Amaku, Asahi-cho, Takeo-shi, Saga               Nakayama Iron Works Co., Ltd. (72) Inventor Shinsuke Inoue             1 of 2246, Amaku, Asahi-cho, Takeo-shi, Saga               Nakayama Iron Works Co., Ltd. F-term (reference) 4D021 AA03 CA03 EB01 FA09 GA02                       GA13 GA17 GB01 GB02 HA01

Claims (5)

[Claims] 1. A vibrating means for vibrating a main body elastically supported by a spring, and a plurality of receiving plates arranged stepwise inside the main body so as to move crushed sand from an upper stage to a lower stage. The classified surface, the crushed sand inlet formed at one end of the main body to supply the raw crushed sand to the upper end of the classified surface, and the other end of the main body to take out the classified crushed sand from the lower end of the classified surface. The crushed sand discharge chamber formed on the main body, the crushed sand discharge port formed on the main body so as to open below the crushed sand discharge chamber, the classification chamber formed on the upper side of the classification surface, and the opening above the classification chamber. The exhaust port formed in the main body, the air inlet chamber formed on the lower surface side of the classification surface and the air intake port formed in the main body so as to open into the air inlet chamber, and from the tip of each receiving plate. Reticulate body extended in the moving direction of crushed sand In the crushed sand fine powder classifier, the crushed sand fine powder classifier is provided with an air inflow path formed between the receiving plates so as to open from the air inflow chamber to below the mesh and communicate with the classification chamber. As described above, a sieving net, which is a reticulated body different from the classification surface, is attached to the tip of the lowermost receiving plate so as to be horizontal or have a downward slope, and the crushed sand extraction port is a lower part of the sieving net. The crushed sand fine powder classifier is characterized in that it is divided into an undersize outlet formed in the above and an oversize outlet formed in the front lower portion of the sieving net. 2. The crushed sand fine powder classifier according to claim 1, wherein the classifying chamber is divided into a plurality of classifying small chambers so that it does not come into contact with the crushed sand moving on the classifying surface substantially vertically downward from the upper surface of the main body. A crushed sand fine powder classifier in which a baffle plate is hung vertically within the range and an exhaust port is formed in each class chamber. 3. The crushed sand fine powder classifier according to claim 1, wherein a boundary portion between the classification chamber and the crushed sand discharge chamber is positioned so that it does not come into contact with crushed sand moving on the classification surface substantially vertically downward from the upper surface of the main body. A crushed sand fine powder classifier with baffle plates installed vertically in the range. 4. The crushed sand fine powder classifier according to claim 1, wherein the classifying chamber is divided into a plurality of classifying small chambers so as not to come into contact with the crushed sand moving on the classifying surface substantially vertically downward from the upper surface of the main body. A baffle plate is vertically installed within the range, and an exhaust port is formed in each classifying chamber, and it moves on the classifying surface from the upper surface of the main body to a position almost vertically right below the boundary between the classifying chamber and the sand crushing chamber. The crushed sand fine powder classifier has a baffle plate installed to the extent that it does not come into contact with the crushed sand. 5. The crushed sand fine powder classifier according to claim 2, wherein a lower end of the baffle plate is bent in a range from a vertical direction to a crushed sand inlet side in a substantially horizontal direction. .