JP2919826B1 - Screw press for concentration - Google Patents

Abstract

The present invention provides a screw press for concentration capable of uniformly concentrating a raw material, preventing scattering of the raw material, and easily adjusting the setting of the concentration pressure. SOLUTION: A screw 5 is provided in a cylindrical casing 1.
And pressurize while feeding the raw material from the inlet side of one end of the casing to the outlet side of the other end of the casing to discharge water from the liquid outlet 4 formed in the outer periphery of the casing 1 and to concentrate from the outlet side of the casing 1 In the screw press for concentrating the raw material, a retaining chamber 3 connected to the other end of the casing 1 and an outlet 12 provided in the retaining chamber 3 are provided.
And a scraping rotor 14 that rotates in the retention chamber 3 and feeds the concentrated raw material toward the discharge port 12, and an opening / closing valve 15 that opens and closes the opening of the discharge port 12 in an adjustable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a screw press for concentration. More specifically, the present invention relates to a screw press used for concentrating water-containing raw materials in various industrial fields such as food, chemicals, and paper pulp, or for concentrating sludge discharged from a manufacturing process.

[0002]

2. Description of the Related Art As a conventional screw press for concentration,
JP-A-6-5792, JP-A-6-48989, and JP-A-8-10989. In all of these screw presses for concentration, a screw is rotated in a cylindrical casing, and the screw is formed by winding a spiral blade around a tapered screw body. Screw barrel is tapered like a small screw cylinder diameter of the casing inlet side, since the large screw cylinder diameter of the casing outlet side, the volume of material in the casing passes is smaller as the direction from the casing inlet side to the outlet side Has become. For this reason, the raw material supplied to the inlet side of the casing is continuously pressed against the inner wall of the casing while being sent to the outlet side of the casing as the screw rotates. As described above, by the pressurization, the moisture contained in the raw material is separated, discharged from a number of liquid outlets provided on the outer periphery of the casing, and the raw material is concentrated. Then, in order to adjust the degree of pressurization, an umbrella-shaped valve is configured to be pressed against the outlet side of the casing by a spring or the like.

[0003] The conventional pressure adjusting mechanism will be described in detail with reference to FIG. 51 is a casing, 52 is a screw,
It is composed of a screw drum 53 and blades 54. 5
Reference numeral 5 denotes a discharge port provided at the other end of the casing 51.
Also, an umbrella-shaped valve 5 is provided at the outlet end of the casing 51.
6 is pressed by a spring 57 or an air cylinder or a hydraulic cylinder to adjust the outlet gap of the raw material on the outlet side of the casing 51. Of course, when the outlet gap becomes smaller, the pressure applied in the casing 51 becomes larger, and when the outlet gap becomes larger, the casing 51 becomes smaller.
Pressure in the inside becomes small. The final pressurization is mainly performed in the concentration zone Z from the portion where the blade 54 has been cut to the umbrella valve 56.

[0004]

In the prior art, however, the umbrella-shaped valve 56 has a ring-shaped uniform gap with the outer periphery of the screw barrel 53, but the narrow enrichment zone Z
Therefore, there is a problem that the degree of compression of the raw material cannot be made constant and the concentration cannot be made constant. In addition, since the degree of compression is non-uniform in this way, there is a problem that water is pushed to the lower side of the degree of compression of the raw material and a water path is naturally formed, from which water scatters to the outside. Management is cumbersome. Further, there is a problem that it is difficult to adjust the compression pressure in the concentration zone Z to a target value by the set pressure of the spring 57 that presses the umbrella-shaped valve 56. Therefore, the type of raw materials and the water concentration change. In addition, there is a disadvantage that readjustment when the amount fluctuates is difficult and the operation rate is not good.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a screw press for concentrating which can make the concentration of the raw material uniform, prevent scattering of the raw material, and easily adjust the setting of the concentration pressure.

[0006]

According to a first aspect of the present invention, there is provided a screw press for concentrating, wherein a screw is rotated in a cylindrical casing and pressurized while feeding a raw material from an inlet side at one end of the casing to an outlet side at the other end of the casing. In a concentration screw press for discharging water from a liquid outlet formed in the outer periphery of the casing and discharging concentrated raw material from an outlet side of the casing, a retention chamber connected to the other end of the casing is provided. A discharge port provided in the retention chamber, a scraping rotor that rotates in the retention chamber and feeds the concentrated raw material toward the discharge port, and an open / close valve that adjustably opens and closes the opening of the discharge port. And the outlet
Is provided on a side wall of the staying chamber, and
The rotor supports the screw with the vane type blade.
It is characterized by being attached to a shaft . Claim 2
The screw press for concentrating is characterized in that the opening / closing valve comprises a valve plate hingedly attached to an edge of the discharge port with a hinge, and an actuator for opening and closing the valve plate.

According to the first aspect of the present invention, the raw material sent to the outlet side by the screw temporarily stays in the holding chamber and is discharged outside by the scraping rotor. Since the retention chamber has a large volume in which the scraping rotor rotates and is mixed by the scraping rotor, the degree of pressurization of the concentrated raw material in the retention chamber and thus the degree of concentration can be made uniform. In addition, the concentrated raw material is uniformly pressurized, so that water does not collect in the low concentration portion, and since the concentrated raw material is surrounded by the retention chamber, it does not scatter outside. Further, since the discharge amount of the raw material can be adjusted in proportion to the adjustment of the opening degree of the opening / closing valve, the concentration pressure can be adjusted accurately. Therefore, the type and concentration of raw materials,
Even if the amount fluctuates, readjustment can be performed easily and quickly, and the operation rate is improved. And the scraping rotor is a vane type
The scraping efficiency to the discharge port provided on the side wall is good,
Blades are attached to the screw support shaft
Therefore, the structure is simple. According to the second aspect of the present invention, since the discharge port is opened and closed by the valve plate, the structure is simple, and the opening can be accurately adjusted and opened and closed by an appropriate actuator, so that automatic opening and closing control can be incorporated.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a principal part of a screw press for concentration according to an embodiment of the present invention, FIG. 2 is a perspective view of a principal part of the screw press, and FIG. 3 is a sectional view of the screw press.

First, a screw press for concentration according to the present embodiment (hereinafter simply referred to as a screw press) based on FIG.
Will be described. Reference numeral 1 denotes a cylindrical casing. The left side in the figure is the inlet side, and the right side in the figure is the outlet side. 1b is a flange for connecting a plurality of casing cylinders, 1
c is a reinforcing rib. A raw material inlet 2 is formed on the inlet side of the casing 1, and a substantially cylindrical retention chamber 3 is connected to the outlet side. A large number of liquid outlets 4 having a diameter of about 2 mm are provided on the outer periphery of the casing 1.
Perforated almost the entire length and all around (Note that
In FIG. 2, only a part of the liquid outlet holes 4 is shown, and others are omitted).

[0010] Inside the casing 1, a screw 5 is coaxially arranged. This screw 5
A screw-shaped blade 7 is wound around the outer surface of the screw body 6. The screw cylinder 6 is a tapered cylinder,
Screw diameter on the inlet side is small and screw on the outlet side
-The torso diameter is large. Therefore, the volume between the screw 5 and the inner surface of the casing 1 gradually decreases from the inlet side to the outlet side. Due to the gradual decrease in the volume, the raw material sent by the screw 5 is concentrated under pressure.
The water that has been pressurized and separated from the raw material is discharged from the liquid outlet 4. The screw 5 is supported by a support shaft 8, and both sides of the support shaft 8 are rotatably supported by bearings 9.

Next, the details around the staying chamber 3 will be described with reference to FIGS. The retention chamber 3 is a substantially cylindrical compartment,
An outlet 12 is formed in a part of the side wall 11, and a front end is formed on the front wall 1.
3 (the front wall 13 is not shown in FIG. 2). A vane type scraping rotor 14 is attached to a support shaft 8 that penetrates the stay chamber 3. Although the illustrated scraping rotor 14 has three blades, it may have two blades or four or more blades. However, if the number of blades is too large, the scraping efficiency is rather lowered, so the optimum number of blades may be selected according to the physical properties of the material to be handled.

An opening / closing valve 15 is attached to the outlet 12. The open / close valve 15 has a flat valve plate 16 attached to the tip of the discharge port 12 with a hinge or the like so as to be openable and closable, and an air cylinder 17 connected as an actuator for opening and closing the valve plate 16.

The opening and closing of the valve plate 16 is performed by opening and closing a solenoid valve of a pneumatic circuit for controlling the expansion and contraction of the air cylinder 17 by a control signal from a controller.
Automatic control is possible. In this case, if the target values of the physical properties of the raw materials and the enrichment are input to the controller, the automatic enrichment can be controlled.

According to the above embodiment, the screw 5
When the is rotated, the raw material is pressurized between the casing 1 and the screw 5 and is gradually sent to the outlet side while separating water, and the concentrated raw material reaching the outlet of the casing 1 is sent into the retention chamber 3. It is. The housing 1 has a casing 1
Has a large volume as compared with the outlet volume, and the level of pressure is alleviated. In addition, since it is stirred by the scraping rotor, the concentration and pressurization of the raw material stored therein are made uniform.

Since the degree of pressurization of the concentrated raw material is uniform and the retaining chamber 3 is sealed by the side wall 11 and the front wall 13, the raw material is prevented from being scattered to the outside. You.

The opening and closing of the flat valve plate 16 can be adjusted in proportion to the opening degree of the discharge port 12 depending on the opening and closing angle, so that the pressure in the retaining chamber 3 can be adjusted accurately. For this reason, automatic density adjustment is also easy. Therefore, the target concentration can be easily and quickly adjusted to the target concentration even if the type, concentration, or amount of the raw material changes.

Next, another embodiment of the present invention will be described. Although the vane type blade is used as the scraping rotor, the invention is not limited to this, and any type of scraping rotor may be used as long as the material can be scraped. However, the vane type has the advantage that the structure is simple and the scraping efficiency is good. Although the open / close valve 15 uses a flat valve plate 16, the present invention is not limited to this, and any valve may be used as long as the opening of the outlet 12 can be adjusted. The opening and closing actuator is also air cylinder 1
The actuator is not limited to 7, and may be a hydraulic cylinder, or may be an arbitrary actuator such as an electric motor.

[0018]

According to the first aspect of the present invention, the concentration of the concentrated raw material becomes uniform, moisture does not scatter to the outside, and adjustment and resetting of the concentration pressure can be performed quickly and accurately. Also concentrated
The scraping efficiency of the used raw material is improved, and the structure is simplified.
According to the second aspect of the invention, the structure is simple, the opening degree can be adjusted accurately, and automatic opening / closing control can be incorporated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a screw press for concentration according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the screw press.

FIG. 3 is a sectional view of the screw press.

FIG. 4 is a longitudinal sectional view of a main part of a conventional screw press for concentration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 3 Retention chamber 5 Screw 6 Screw cylinder 7 Blade 8 Support shaft 12 Discharge port 14 Scrape rotor 15 Opening / closing valve

Claims (2)

(57) [Claims] 1. A screw is rotated in a cylindrical casing to pressurize while feeding a raw material from an inlet side of one end of a casing to an outlet side of the other end of the casing, and to remove water from a liquid outlet formed in an outer periphery of the casing. A screw chamber for discharging the concentrated raw material from the outlet side of the casing, wherein: a retaining chamber connected to the other end of the casing; a discharge port provided in the retaining chamber; A scraping rotor that rotates in a room and feeds the concentrated raw material toward the outlet, and an opening / closing valve that adjustably opens and closes the opening of the outlet.
Provided and said discharge port are provided on the side wall of the holding chamber, before
The scraping rotor moves the vane-type blades
A screw press for concentration, wherein the screw press is attached to a support shaft of a car . 2. The valve according to claim 1, wherein said opening / closing valve comprises a valve plate hinged to an end of said discharge port so as to be openable and closable, and an actuator for opening and closing said valve plate. Screw press for concentration.