JP3213695B2 - Filter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device, and more particularly to a filter device for filtering a plasticized material in a molten state, such as a synthetic resin material, with a filtration area several times as large as that of a conventional one, thereby enabling continuous filtration for a long time. It is about a new improvement for.

[0002]

2. Description of the Related Art Generally, when granulating a synthetic resin material, a screw-type kneading extruder is used to remove foreign matter or unmelted material mixed in the material from a molten synthetic resin material. . To remove the foreign matter or unmelted material, the synthetic resin material is usually continuously filtered by a ring screen provided at the tip of a screw-type kneading extruder. FIG. 3 is a partial cross-sectional plan view showing a conventional filter device.

In FIG. 3, reference numeral 10 denotes a filter device for filtering a plasticized material. The filter device 10 reciprocates in a housing 1 and a through hole 1a provided in the housing 1 in a liquid-tight manner. Possible slide bar 2
And a fluid pressure cylinder 3 supported by the housing 1 and reciprocatingly driving the slide bar 2. The housing 1 is usually a rectangular block, and a straight through hole 1a having a circular cross section perpendicular to the axis between a pair of end faces (between left and right end faces in FIG. 3), and the through hole 1a.
A through flow path 1b is provided at a central portion between a pair of end faces intersecting with each other (in FIG. 3, between upper and lower end faces). The upper side in FIG. 3 is an inflow port 1c, and the lower side is an outflow port 1d.

The slide bar 2 has a cylindrical shape. The slide bar 2 is provided with a ring-shaped filter 5A comprising a ring-shaped screen 4 and a breaker plate 5 for supporting the ring-shaped screen 4. That is, the slide bar 2 is provided with a small-diameter portion 2a concentric with the outer periphery thereof, and the cylindrical breaker plate 5 is held around the small-diameter portion 2a through an annular gap 2c. The annular screen 4 is provided on the entire outer periphery of the screen. The outer diameter of the annular screen 4 is smaller than the outer diameter of the slide bar 2,
An outer gap 2b is formed between the outer periphery of the hole and the through hole 1a. The annular gap 2c is formed so as to extend in the direction of the other end of the slide bar 2, and is provided with an outflow channel 2d that is open from the extension to the outer periphery. That is,
The filter device 10 is configured such that the inlet 1c of the housing 1 is in a normal use state in which the end face of one end of the slide bar 2 is arranged flush with the end face of one end of the housing 1.
Communicates with the other end of the outer gap 2b. Similarly, in a steady state, an outflow channel 2d provided at an extension of the other end of the annular gap 2c communicates with an outflow port 1d of the housing 1. With the above configuration, in the steady use state, the inflow port 1c is connected to the outer gap 2b,
The outlet 1 passes through the annular screen 4, the breaker plate 5, the annular gap 2c, and the outflow channel 2d.
d.

A support plate 7 is provided on the other end surface of the housing 1 via a plurality of tie rods 6, and the fluid pressure cylinder 3 is provided on the support plate 7 concentrically with the slide bar 2. Have been. The hydraulic cylinder 3 is a hydraulic cylinder or a pneumatic cylinder, and has a piston rod 3 a connected to the other end of the slide bar 2.
That is, by driving the fluid pressure cylinder 3, the slide bar 2 is moved into the through hole 1 a of the housing 1.
Reciprocate in the axial center direction.

[0006] The filter device 10 configured as described above
Is connected to the tip of a cylinder of a screw-type kneading extruder (not shown) by connecting an inflow port 1c to an inner hole of the cylinder. A downstream device such as a granulation device (not shown) is connected to the outlet 1d of the filter device 10. In the steady state of the filter device 10 shown in FIG. 2, the molten synthetic resin material extruded from the screw-type kneading extruder flows from the inlet 1 c to the outer gap 2 b, the annular screen 4, the breaker plate 5, the annular gap 2 c and the outflow. It flows to the outlet 1d via the flow path 2d and flows out to the downstream equipment. During this time, when passing through the annular screen 4, foreign matter or unmelted material mixed in the synthetic resin material is filtered, and the synthetic resin material from which the foreign material or unmelted material has been removed flows out.

As the filtration time elapses, the annular screen 4
The filtered foreign matter or unmelted material accumulates on the outer surface of the resin material, the flow resistance of the synthetic resin material increases, and the driving force of the screw-type kneading extruder increases more than necessary. In the filter device 10, the annular screen 4 is replaced with a clean one in order to reduce the flow resistance. At that time, the hydraulic cylinder 3 is operated to move the slide bar 2
Is moved rightward in FIG. 3 to expose the entire annular screen 4 from one end surface of the housing 1. In this exposed state, the annular screen 4 is replaced with a clean one, and the fluid pressure cylinder 3 is operated to return the slide bar 2 to the original position.

Normally, one filter device 10 is
Two slide bars 2 (each having a separate hydraulic cylinder 3) are provided in a direction perpendicular to the paper surface of FIG. Ring screen 4 of slide bar 2
At the time of replacement, the filtration is continued by the annular screen 4 of the other slide bar 2 so that the flow of the synthetic resin material is not stopped.

[0009]

Since the conventional filter device is configured as described above, there are the following problems. That is, although the annular screen 4 forms a wide filtration surface around the outer periphery of the cylinder, the flow path length and the flow resistance vary depending on the position of the filtration surface, and the synthetic resin material constantly averages the entire filtration surface. Can not. Further, since the inflow port 1c and the outflow port 1d are located at the same end of the annular screen 4, that is, at the left end side in FIG. 3, when the annular screen 4 is clean, the synthetic resin material is Most flows on the left end, where flow resistance is low. Therefore, it is difficult to flow along the outer periphery of the annular screen 4 to the side opposite to the inlet 1c. Further, when the filtration material accumulates with the passage of time, the flow (filtration) resistance at that location increases, and the flow becomes difficult. Therefore, the synthetic resin material that fills the outer gap 2b on the outer periphery of the annular screen 4 partially stays, the synthetic resin material that stays for a long time deteriorates, and the deteriorated material is mixed into the product.
Product quality decreases.

Further, when a low-viscosity material is continuously treated after a high-viscosity material, the high-viscosity material in the stagnant portion does not easily flow out, but is mixed with the low-viscosity material little by little and flows out. As a result, fish eyes were caused and the product quality was reduced.

The present invention has been made in order to solve the above-mentioned problems, and in particular, has a filter with a filtration area several times larger than that of a conventional one, and has a ring-shaped screen without stagnation of a synthetic resin material for a long time. It is an object of the present invention to provide a filter device which allows the entire surface to be constantly passed on average.

[0012]

In order to achieve the above object, a filter device according to the present invention is configured as follows. That is, with respect to the annular screen held in the same axial center state by the slide bar inserted reciprocally in a liquid-tight state in the through hole of the housing, the inflow port is provided on the outer periphery at one end side in the axial center direction of the annular screen. The outlet is connected to the inner circumference at the other end. In addition, the inflow passage of the slide bar is provided eccentrically with respect to the through-hole, and the inflow passage communicates with the inflow passage at a location where the gap of the flow passage cross-sectional area of the inflow passage is the largest, so that the inflow passage is always averaged over the entire axial direction of the annular screen. This is a configuration in which the material is allowed to flow and the stagnation is eliminated for a long time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a filter device according to the present invention will be described below in detail with reference to the drawings. Note that the same reference numerals are used for the same or equivalent members as the constituent members in the description of the related art. FIG. 1 is a partial sectional plan view showing a filter device according to the present invention.

In FIG. 1, reference numeral 10 denotes a filter device. The filter device 10 includes a housing 1, a slide bar 2 which can reciprocate in a through hole 1a formed in the housing 1 in a liquid-tight manner, and It comprises a fluid pressure cylinder 3 supported by a housing 1 and reciprocatingly driving a slide bar 2. The housing 1 is usually
The through hole 1a, which is a rectangular block, is linear between a pair of end surfaces (between left and right end surfaces in FIG. 1), and a pair of end surfaces in a direction intersecting the through hole 1a (in FIG. A through-flow channel 1b is provided at the center between the upper and lower end faces. An inflow port 1c is formed on the lower side in FIG. 1 and an outflow port 1d is formed on the upper side in FIG.

The slide bar 2 has a cylindrical shape.
At an outer peripheral position of the tapered small-diameter portion 2a formed at a part thereof, a ring-shaped filter 5A including a ring-shaped screen 4 and a breaker plate 5 supporting the ring-shaped screen 4 is provided. An inner gap 2c around the small diameter portion 2a
The breaker plate 5 having a cylindrical shape is held through the intermediary of the breaker plate 5, and the annular screen 4 is provided on the entire outer periphery of the breaker plate 5. The small-diameter portion 2a is formed in a tapered shape such that the diameter decreases from one end to the other end, and the annular cross section of the inner gap 2c is formed so as to gradually increase from one end to the other end. The outer periphery of the annular screen 4 has a smaller diameter than the outer periphery of the slide bar 2, and an outer gap 2b is formed between the outer periphery of the annular screen 4 and the through hole 1a. The inner gap 2 c is formed to extend in the axial direction of the slide bar 2, and an outflow channel 2 d formed on the outer periphery of the slide bar 2
Are provided in communication with the inner gap 2c.

On the outer periphery of the slide bar 2 at one end of the annular screen 4, a groove-like inflow passage 2 is formed over the entire periphery.
2, the inflow passage 2e is eccentric with respect to the through hole 1a as shown in FIG. 2, and the cross-sectional area of the passage is changed in the circumferential direction.
c, the inflow port 1c and the inflow channel 2e.
A throttle portion 2f is formed in a circumferential direction between the outer periphery of the slide bar 2 and the through hole 1a at a position communicating with the annular filter 5A.

That is, as shown in FIG. 1, the filter device 10 is configured such that the flow of the housing 1 in the normal use state is such that the end face of one end of the slide bar 2 is flush with the end face of one end of the housing 1. The inlet 1c communicates with the gap 2eA of the inflow channel 2e of the slide bar 2, and the outlet 1d communicates with the outflow channel 2d. Therefore,
The inflow port 1c is connected to the inflow channel 2e,
f, through the outer gap 2b, the annular screen 4, the breaker plate 5, the inner gap 2c, and the outflow passage 2d to communicate with the outlet 1d.

A support plate 7 is provided on the other end surface of the housing 1 via a plurality of tie rods 6, and the fluid pressure cylinder 3 is provided on the support plate 7 concentrically with the slide bar 2. Have been. The piston rod 3a of the fluid pressure cylinder 3 is connected to the other end of the slide bar 2. That is, by driving the fluid pressure cylinder 3, the slide bar 2 is moved into the through hole 1 of the housing 1.
a. Usually, one filter device 10 is provided with two hydraulic slide bars 2 which are provided with fluid pressure cylinders 3 in a direction perpendicular to the plane of FIG. It is arranged so that it can be alternately moved to a stationary position and can continuously filter the material.

Next, the operation will be described. First, the inflow port 1c is connected to the tip of a cylinder of a screw-type kneading extruder (not shown) so that the inflow port 1c communicates with the inner hole of the cylinder.
Further, a downstream device such as a granulating device (not shown) is connected to the outlet 1d of the filter device 10. As shown in FIG. 1, in a steady use state of the filter device 10, a synthetic resin material in a molten state extruded from a screw-type kneading extruder (not shown) flows into the filter device 10 from an inflow port 1c,
It flows to the outlet 1d through the inflow channel 2e, the narrowed portion 2f, the outer gap 2b, the annular screen 4, the breaker plate 5, the inner gap 2c, and the outflow channel 2d, and to the downstream device (not shown). During this time, when passing through the annular screen 4, the synthetic resin material from which the foreign substances or unmelted substances mixed in the synthetic resin material are filtered out.

First, the synthetic resin material in the molten state flowing in the filter device 10 is connected to the gap 2eA of the slide bar 2 where the inflow passage 2e of the slide bar 2 has a large flow passage cross-sectional area. The inlet 1c
Therefore, the entire circumference of the inflow passage 2e is easily filled. Next, the synthetic resin material flows into the outer periphery of the annular screen 4 from the inflow channel 2e via the narrowed portion 2f, and fills the outer gap 2b. Next, since the annular cross section of the inner gap 2c gradually increases in the direction from the inflow channel 2e to the outflow channel 2d, there is almost no difference in the flow resistance over the entire surface of the annular screen 4 and the breaker plate 5, and the synthesis is performed. The resin material is kept from the outer gap 2b to the inner gap 2c over the entire cylindrical surface of the annular screen 4 and the breaker plate 5 without stagnation.
And flows out to the outflow port 1d through the outflow channel 2d.

As the filtration time elapses, the annular screen 4
The filtered foreign matter or unmelted material accumulates on the outer surface of the resin material, the flow resistance of the synthetic resin material increases, and the driving force of the screw-type kneading extruder increases more than necessary. In order to reduce the flow resistance, it is necessary to replace the annular screen 4 with a clean one. At that time, only one of the hydraulic cylinders 3 is operated and one of the slide bars 2 is operated.
1 is moved rightward in FIG. 1 to expose the entire annular screen 4 from one end surface of the housing 1. In this exposed state, the annular screen 4 is replaced with a clean one, and the fluid pressure cylinder 3 is operated to move the slide bar 2 to the left in FIG. At the time of this exchange, by exchanging each slide bar 2 one by one, when exchanging the annular screen 4 of one slide bar 2, filtration is continued by the annular screen 4 of the other slide bar 2, The filtration is performed continuously without stopping the flow of the synthetic resin material.

In the above description, the filter device according to the present invention is described for the case of a synthetic resin material.
The material to be filtered is not limited to a synthetic resin material, but can be applied to other high-viscosity or high-density plasticized materials and solutions such as food materials.

[0023]

The filter device according to the present invention is configured as described above, so that the following effects can be obtained. That is, the inflow port communicates with the outside of the one end side in the axial direction of the annular screen, and the outflow port communicates with the inside of the other end side, whereby the plasticized material constantly averages the entire filtration surface in the axial direction of the annular screen. And the stagnation as in the prior art can be prevented. As a result, it is possible to prevent a decrease in product quality due to deterioration of the material due to a long stay. Similarly, even when a material having a low viscosity is continuously processed after a material having a high viscosity, no stagnation of the material occurs, and no reduction in product quality due to fish eyes occurs.

Further, since the inflow port is communicated with the gap having the largest flow path cross-sectional area of the inflow flow path, the plasticized material
At the entire circumference of the annular screen in the circumferential direction, it flows into the outer gap at substantially the same axial flow velocity, fills the outer gap, and can constantly and evenly pass through the entire filtering surface of the annular screen.

[Brief description of the drawings]

FIG. 1 is a partial sectional plan view showing a filter device according to the present invention.

FIG. 2 is a sectional view taken along line II of FIG.

FIG. 3 is a partial sectional plan view showing a conventional filter device.

[Explanation of symbols]

1 ... housing, 1a ... through hole, 1c ... inflow, 1d ... outflow, 2 ... slide bar 2a ... small diameter portion, 2b... Outer gap, 2c... Inner gap, 2d... Outflow channel, 2e... Inflow channel, 2f. Pressure cylinder, 4 ... annular screen, 5 ... breaker plate, 5A ... annular filter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B01D 29/90 B01D 33/00 B01D 35/02

Claims (2)

(57) [Claims] A slide bar (5A) which is inserted into a through hole (1a) of a housing (1) in a reciprocating manner in a liquid-tight manner and has an annular filter (5A) comprising an annular screen (4) and an annular breaker plate (5). In the filter device having (2), an outer clearance (2b) and the outer clearance are provided on the outer periphery of the slide bar (2).
An inner gap (2c) is provided inside (2b), and an inflow port (1c) and an outflow port (1d) provided outside the axial direction of the annular filter (5A), and the slide bar is provided. An annular inflow channel (2e) formed on the outer periphery of (2) is formed eccentrically with respect to the through hole (1a), and is formed between the inflow channel (2e) and the through hole (1a). A filter device, wherein the inflow port (1c) communicates with the largest gap (2eA) formed. 2. The tapered small diameter portion (2a) is formed in the slide bar (2), and the inner gap (2c) is formed on the outer periphery of the small diameter portion (2a), and the small diameter portion (2a) is formed. 2. The filter device according to claim 1, wherein the filter is located inside the annular filter (5A).