JPS5914257B2 - Pulp sorting vibrating screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention was provided for the purpose of improving the sorting function of a vibrating screen used for rough pulp sorting.

Generally, vibrating screens are used for the purpose of rough sorting after pulper processing.

As shown in Figure 1, the principle is that pulp slurry is supplied from one end of the screen plate 1 which is subjected to slight vibrations, and foreign matter that does not pass through the screen plate 1, especially plastic pieces, wood pieces, cloth, paper pieces, etc. The lightweight foreign matter is rejikutoi to the other end forward by the vibration action, the coarsely sorted pulp that has passed through the screen plate 1 is received by the screen butt 2 provided below the screen plate 1, and the overflow liquid is collected from the outlet 3. In this way, rough sorting is attempted.

However, sand and stones that cannot be captured by screen plate 1
Foreign matter with a high weight ratio (hereinafter referred to as heavy foreign matter) such as ceramic pieces is deposited at the bottom of the screen batt 2 and gradually accumulates.

For this reason, it is necessary to periodically stop the operation and remove these substances, resulting in deterioration of operating efficiency and work burden.

As mentioned above, when pulp slurry is applied to a vibrating screen for rough sorting, the above-mentioned heavy foreign matter that passes through the screen plate and settles to the bottom of the screen vat can be effectively collected and removed at any time. The present invention is characterized in that the screen bat of the known vibrating screen is attached with the means for collecting the heavy foreign matter.

Embodiments of the present invention are shown from FIG. 2 onwards.

In the figure, 4 is the screen plate, and 5 is a screen bat placed below the screen plate. (not shown)
The structure is such that slight vibrations are applied at .

The inner bottom of the screen bat 5 located below the screen plate 1 is formed into an inclined bottom surface (first inclined bottom surface) 7 as shown in the drawing, and a bottom tray 8 is connected to the lower part of the first inclined bottom surface 7.

The bottom tray 8 is provided with a head difference from the lower part of the first inclined bottom surface 7, and its inner bottom is similarly formed into an inclined bottom surface (second inclined bottom surface) 9, and a foreign matter reservoir is formed at the lower level of the second inclined bottom surface 9. 10 in a row.

The foreign matter reservoir 10 is located outside the screen batt 5, and a foreign matter removal port 11 is provided at the same position.

In one embodiment, the foreign matter removal port 11 is opened above the liquid level of the foreign matter reservoir, as shown in FIGS. 3 and 4.

FIG. 5 shows a case where a foreign matter scraping device 12 consisting of a combination of a cylinder 13 and a link mechanism 14 is attached to the foreign matter discharge port 11.

As another embodiment, the foreign matter removal port 11 is opened at the bottom below the liquid level of the foreign matter reservoir 10, and a pair of on-off valves 15, 16 are provided above and below the foreign material removal port 11, and the on-off valves 15, 1
6 is alternately opened and closed, thereby making it possible to intensively discharge only aged foreign matter into the foreign matter reservoir 10 while preventing pulp slurry from flowing out.

FIG. 3 shows a case in which the bottom tray 8 and its foreign matter reservoir 10 are installed in a direction perpendicular to the foreign object rejection direction of the screen plate 4, and FIG. 4 shows a case in which they are installed in a direction parallel to the same foreign object rejection direction. show.

According to the present invention, while the screen plate 4 rejects lightweight foreign matters, the screen plate 4
The heavy foreign matter that cannot be captured by the bottom tray 8 is caused to settle on the first inclined bottom surface 7 and guided into the bottom tray 8 according to the inclination, and the foreign matter collected in the bottom tray 8 is guided to the foreign matter reservoir 10 according to the inclination of the second inclined bottom surface 9. It can be guided within and concentratedly collected therein.

The foreign matter 17 collected in the foreign matter reservoir 10 can be effectively discharged from the foreign matter removal port 11 at any time.

As an example, a vibrating device may be attached to the bottom tray 8 in order to promote the foreign matter guiding effect of the first and first inclined bottom surfaces 7 and 9.

As mentioned above, by making the screen vat 5 have both the collection function of coarsely sorted pulp slurry and the function of collecting heavy foreign matter, the vibrating screen performs the foreign matter removal function of the screen plate 4 while the screen plate It is possible to intensively and continuously collect and eliminate heavy foreign objects that cannot be captured by the method 4 during operation.

Therefore, the ability to remove foreign substances by the vibrating screen is significantly improved, and pulp slurry that is as carefully selected as possible can be recovered, making it possible to simplify and reduce the burden on other subsequent sorting equipment, and improve pulp quality. .

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the principle structure of a conventional vibrating screen, Fig. 2 and subsequent figures show embodiments of the present invention, Fig. 2 is a sectional view of the same vibrating screen, and Figs. 3 and 4 are vibrating screens. FIG. 5 is a cross-sectional view of the screen bat that partially cuts through the bottom tray, showing an example in which a foreign matter scraping device is attached, and FIG. It is a sectional view of the same screen bat showing the other side of the same foreign matter discharge part. 4...Screen plate constituting the vibrating screen, 5...Screen bat, 7...
...First inclined bottom surface, 8...Bottom tray, 9
...Second inclined bottom surface, 10...Foreign matter reservoir,
11... Foreign matter removal port, 12... Foreign matter scraping device, 15, 16... Opening/closing valve.

Claims (1)

[Claims] 1. The inner bottom of the screen bat located under the screen plate is a first inclined bottom surface, a bottom tray is connected to the lower part of the first inclined bottom surface, and the inner bottom of the bottom tray is formed as a second inclined bottom surface. a bottom surface, and a foreign matter reservoir is connected to the lower part of the second inclined bottom surface,
A pulp sorting vibrating screen comprising a foreign matter removal port provided in the foreign matter reservoir. 2. A pulp sorting vibrating screen as set forth in item 1, characterized in that the foreign matter removal port is opened above the liquid level of the foreign matter reservoir. 3. A pulp sorting vibrating screen according to the invention described in item 1, characterized in that a foreign matter removal port is opened at the bottom below the liquid level of the foreign material reservoir, and a pair of on-off valves are provided in the removal port.