JPH06339603A - Self-washing high performance inclined screen - Google Patents

Abstract

PURPOSE:To increase remarkably solid-liq. separating ability in comparison with the conventional inclined screen wherein only removal of clogging is performed by means of a rotating brush by providing a liq. collecting room with an air-tight structure except a screen part on the lower side of a screen and making this collecting room perform suction and ejection through the screen. CONSTITUTION:In an automatic high performance inclined screen 1, when a pressure increasing and decreasing means 8 is operated, a liq. collecting room 4 with an airtight structure repeats alternately pressure increasing and decreasing and, when pressure is increased, air in the room is evacuated through the screen 1 and, when suction is performed, outer air is sucked through the screen. As a result, when a solid-liq. mixture is flown down on the screen face, on every suction work, the liq. in the mixture is forcibly squeezed to the collecting room 4 through the screen 1 and, on every ejecting work, air is blown out through the screen 1 and adhered substance on the screen 1 is extruded and, as a result, the screen performs high performance separation of the solid and the liq. while it is automatically washed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-washing type high-performance inclined screen. More specifically, the present invention relates to a tilted screen that prevents clogging of the screen by suctioning and discharging air through the screen and enhances the solid-liquid separation effect by forced liquid removal.

[0002]

2. Description of the Related Art Conventionally, an inclined screen in which a solid-liquid mixture is made to flow down on a screen surface arranged at a predetermined inclination angle to separate a liquid that passes through the screen and a solid that does not pass through it does not consume power. It is popular because it is an economical one that can perform solid-liquid separation. However, since there is a problem that the screen is clogged by the adhered matter and the ability is gradually lowered, a rotary brush 28 is provided on the back of the wedge wire screen 27 as shown in FIGS.
Reciprocating means (illustration omitted) while rotating 8 by a shaft 29
A system of reciprocating the screen 27 to wipe off the deposit on the screen 27 is commercially available.

As described above, the rotary brush that wipes off the deposits on the screen does not cause deterioration of the performance due to the clogging of the screen, but the liquid is drained through the screen only by the action of gravity. However, there is a problem that it is slow and high-performance processing cannot be expected.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the present situation, in which suction / discharge through a screen is performed by a pressure increasing / decreasing means to remove deposits on the screen at the time of discharge and to mix at the time of suction. The purpose of the present invention is to provide an inclined screen in which the ability of solid-liquid separation is greatly enhanced by forcibly squeezing the liquid in the body.

[0005]

The present invention provides a tilted screen in which a solid-liquid mixture is caused to flow down a screen arranged at a predetermined tilt angle to separate a liquid that passes through the screen and a solid that does not pass through the screen. A liquid collection chamber with an airtight structure is provided under the screen except for the screen part.
The problem is solved by a configuration in which this collection chamber is provided with a pressure increasing / decreasing means for performing suction and discharge through the screen.

More specifically, the screen is arranged on the frame at an inclination angle of 20 to 50 degrees, preferably about 30 degrees, and the solid-liquid mixture is made to flow downward from the upper side of the surface thereof. The action of gravity and the suction action of the pressure increasing / decreasing means, which will be described later, allow the liquid to pass through the screen so that the solid and the liquid are efficiently separated. This screen has a wedge as shown in FIGS. 2 and 3. Wire type,
A mesh type, a perforated plate type, or the like, which is not shown in the drawing, is selected and used according to the object to be processed and the processing condition.

Further, if the above-mentioned screen is divided into two lengths and a pivot is provided at the center of each of the screens, and the pivot is rotatably attached to the frame, the upper part of the screen and the lower part of the screen are rotated in a correlated manner. Dynamically adjust and change the screen surface composed of both to flat, mountain type, valley type,
Since the flow rate of the solid-liquid mixture can be variously changed, it becomes possible to adjust the state and the capacity of the solid-liquid separation.

The chamber for collecting the liquid that has passed through the screen has an airtight structure except for the portion facing the screen.
If the pressure increasing / decreasing means to be described later is provided inside or connected to the outside by piping and the pressure increasing / depressurizing means is used to increase and decrease the pressure in the room, discharge is performed through a screen during pressure increase and Since the liquid is sucked through the screen, the solid and the liquid can be separated with a high capacity by the forced liquid removal while automatically cleaning the screen.

The pressure increasing / decreasing means provided in the liquid collecting chamber divides the chamber into two chambers or three chambers or more by one or more partition walls according to the volume, and a diaphragm is attached to the partition wall. Then, when this diaphragm is reciprocated by reciprocating means such as an eccentric wheel, a crank, a cylinder, etc., pressure increase and pressure decrease are alternately generated in the chambers located on both sides thereof,
As described above, suction and discharge can be performed through the screen.

[0010]

The function of the self-washing type high-performance inclined screen according to the present invention is as follows.
When the pressure increasing / decreasing means is operated, the air-tight liquid collection chamber alternately repeats pressure increase and pressure decrease, so that the air in the room is discharged through the screen when the pressure is increased, and the outside air is sucked through the screen when the pressure is increased. Therefore, if the solid-liquid mixture is made to flow down on the screen surface, the liquid in the mixture is forcibly squeezed through the screen into the collection chamber each time the suction operation is performed, and the air is blown out through the screen each time the discharge operation is performed. Since the deposits are removed, the screen is capable of separating solids and liquids with high capacity while performing self-cleaning action.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a self-cleaning type high-performance inclined screen according to the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional side view of an embodiment using a fixed screen. FIG. 2 is an explanatory diagram of a state in which liquid is forcibly drained by a suction operation through the above screen. FIG. 3 is an explanatory view of a state in which the screen is cleared of clogging by a discharging operation through the screen. FIG. 4 is a vertical sectional side view of an embodiment in which the screen is divided and the angle is variable. FIG. 5 is an enlarged plan view of a part of the above-mentioned screen in which the attached state of the screen is omitted and a part thereof is longitudinally cut.

In the embodiment shown in FIG. 1, reference numeral 1 is a screen, which is of a wedge-wai type as shown in FIGS. 2 and 3, and is attached to the upper side of a frame 3 installed on a base 2 at an inclination angle of about 30 degrees. A liquid collection chamber 4 having an airtight structure other than the portion facing the screen 1 is provided on the lower side thereof, and a liquid discharge port 5 is provided below the liquid collection chamber 4, and the inside of the collection chamber 4 has a partition wall in the middle. Dispose 6 and divide into room a and room b,
Further, a rectifying box 7 is provided on the starting end side of the screen 1 for uniformly distributing the solid-liquid mixture on the screen 1.

Reference numeral 8 is a diaphragm as a means for increasing and decreasing the pressure of the collection chamber 4, which is attached to a window portion provided on the partition wall 6, and a mounting plate 10 is attached to the diaphragm 8 by a contact plate 9.
Is fixed to the reciprocating shaft 12 which is movably inserted into a bearing 11 supported by the collecting chamber 4, and one end of the reciprocating shaft 12 is connected to an eccentric ring described later. It is projected to the outside of the collection chamber 4.

An eccentric ring 13 is connected to one end of the reciprocating shaft 12 protruding to the outside of the collecting chamber 4 and reciprocates the same, and is fixed to a rotary shaft 15 supported by a bearing 14 mounted on the base 2. Then, a pulley 16 also serving as a flywheel is fixed to one end of the rotary shaft 15, and when the rotation of the motor 18 is transmitted to the pulley 16 by a belt or chain 17, the eccentric wheel 13 converts the rotary motion into a reciprocating motion. This is transmitted to the reciprocating shaft 12, and the diaphragm 7 is reciprocated by the shaft 12 to alternately increase and decrease the pressure in the chambers a and b of the collecting chamber 4.

In the inclined screen shown in the above embodiment, when the eccentric wheel 13 is rotated by the motor 18, the eccentric wheel 13 is rotated.
Converts the rotary motion into reciprocating motion and transmits it to the reciprocating shaft 12, and causes the diaphragm 7 to reciprocate to cause pressure increase and pressure decrease alternately in the chamber A and the chamber B of the liquid collecting chamber 4, and thus to the screen 1. When the solid-liquid mixture is made to flow down from the flow straightening box 7, the liquid therein is forcibly squeezed into the collecting chamber 4 during suction, and the deposits on the screen 1 are blown off at the time of discharge, without clogging the screen 1. It was confirmed that solid and liquid can be separated efficiently.

The screen of the embodiment shown in FIGS. 4 and 5 is divided into a screen upper part 1a and a screen lower part 1b from the middle as shown in FIG.
9 are attached to the outsides of the side plates 19, and the pivots 20 aligned with the centers of the screen upper portion 1a and the screen lower portion 1b are projected as shown in FIG. As shown in FIG. 4, arc-shaped seal plates 22 are attached to the upper and lower sides of the screen upper portion 1a and the screen lower portion 1b, and these seal plates 22 are attached to the frame 3. The elastic plate 23 is brought into contact with the elastic plate 23, and an elastic plate 24 made of rubber or the like is sandwiched between the side plate 19 and the frame 3 so that they can be water-tightly coupled.

As described above, the screen upper portion 1a
The lower part 1b of the screen and the lower part 1b of the screen are rotated around the pivot 20 while the airtightness of the liquid collection chamber 4 is maintained, and the respective inclination angles are adjusted as desired. When the screw 26 that engages with is tightened, the inclined surface formed by the screen upper portion 1a and the screen lower portion 1b becomes flat,
It can be converted into three types such as middle high and middle low. In this case, in the configuration of the middle high slope, there is a gap as shown in FIG. 4 at the joint between the screen upper portion 1a and the screen lower portion 1b. Is filled with a gap filling material so that the solid-liquid mixture flows smoothly without disturbance.

In the above embodiment, the screen upper part 1
a and the lower part of the screen 1b, the liquid collecting chamber 4 is formed by the joining part of both screens 1a and 1b and the three partition walls 6a, 6b and 6c located at the centers of the respective lengths. The partition wall 6a is divided into four rooms, room b, room c, and room d.
And 6c, diaphragms 8 are attached, and these diaphragms 8 are fixed to a reciprocating shaft 12 inserted into a bearing 11 supported by the frame 3 by a mounting cylinder 10 of a contact plate 9, and an eccentric ring 13 is attached.
When the reciprocating movement is carried out by means of, the chambers a and c and the chambers b and d of the accommodation chamber 4 alternately generate pressure increase and pressure decrease.

In the inclined screen shown in the above embodiment, when the screen upper portion 1a and the screen lower portion 1b are rotated so as to have the same inclination angle with respect to the horizontal plane, the screen upper portion 1a and the screen lower portion 1b are shown in FIG. Since a series of flat inclined surfaces are formed as shown by the solid line, the flow velocity of the solid-liquid mixture over the entire length of the screen becomes constant, but the upper screen 1a and the lower screen 1b are rotated as shown by arrows in FIG. When moved, the upper screen portion 1a and the lower screen portion 1b form a medium-high inclined surface as shown by the alternate long and short dash line in FIG. 4, so that the flow velocity of the solid-liquid mixture is slow in the upper screen portion 1a and high in the lower screen portion 1b. When the screen upper portion 1a and the screen lower portion 1b are rotated in the opposite direction of the arrow in FIG. 4, the screen upper portion 1a and the screen upper portion 1a are rotated. Since the lower part 1b constitutes a medium-low slope as shown by the chain double-dashed line in FIG. 4, the flow velocity of the solid-liquid mixture changes so that it is faster in the upper part 1a of the screen and slower in the lower part 1b of the screen. Thus, the flow state of the solid-liquid mixture can be arbitrarily set according to the processing raw material and the dewatering condition, and even if the inclination angles of the screen upper portion 1a and the screen lower portion 1b are changed in this way, the seal Board 22
Since the liquid collecting chamber 4 is completely kept airtight by the action of the elastic receiving member 23 and the function of increasing / decreasing the pressure of the collecting chamber 4 by the diaphragm 8 of the increasing / decreasing pressure means is not deteriorated, suction and discharge through the screen 1 in this embodiment as well. It was confirmed that solid-liquid separation can be performed with high efficiency while washing the screen 1 by itself.

[0021]

As described above, the self-cleaning type high-performance inclined screen according to the present invention causes the screen to be sucked and discharged by the pressure increasing / decreasing means to remove the clogging by the self-cleaning of the screen and to remove the clogging from the mixture. Since the liquid is forcibly squeezed out, the solid-liquid separation ability can be greatly increased as compared with the conventional inclined screen in which only the clogging is removed by the rotating brush.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of an embodiment using a fixed screen of a self-cleaning type high-performance inclined screen according to the present invention.

FIG. 2 is an explanatory diagram of a state in which forced liquid removal is performed by a suction operation through the above screen.

FIG. 3 is an explanatory diagram of a state in which clogging is removed by a discharging operation through the screen of the above.

FIG. 4 is a vertical sectional side view in which a part of an embodiment in which a screen is divided into two and an angle is changed is omitted.

FIG. 5 is an enlarged plan view of a part of the above screen, in which the attached state of the screen is partly omitted and partly shown in a vertical section.

FIG. 6 is a partial vertical cross-sectional side view showing a conventional state in which the wedge wire screen is clogged with a rotating brush.

FIG. 7 is a partial cross-sectional plan view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 screen 4 liquid collection chamber 8 pressure increasing / decreasing means 1a, 1b screen divided into two 13 axis

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B01D 29/96 29/01 8925-4D B01D 29/04

Claims (2)

[Claims] 1. A tilted screen in which a solid-liquid mixture is made to flow down a screen arranged at a predetermined tilt angle to separate a liquid that passes through the screen and a solid that does not pass through the screen, except the screen portion below the screen. Is a self-cleaning efficacy gradient screen, which is provided with an airtight liquid collecting chamber, and is provided with a pressure increasing / decreasing means for performing suction and discharge through the screen. 2. The screen according to claim 1 is divided into two parts, and the screen surface can be deformed into a flat shape, a mountain shape, and a valley shape by rotating about a pivot provided around each of them. Self-cleaning high-performance tilting screen.