JP6426930B2 - Screen changer - Google Patents

Description

  The present invention relates to a screen changer for filtering an extruded material from an extruder, and in particular, the structure of the screen unit and a guide hole that slidably guides the screen unit are easily sealed. It relates to a screen changer.

  For example, a slide-type screen changer is known as an apparatus for filtering an extruded material such as rubber extruded from an extruder. This type of screen changer a is, for example, as schematically shown in FIG. 6, a case body a1 fixed to the front end of the extruder b, and an X axis direction supported by the case body a1 and perpendicular to the extrusion direction And a screen unit a2 capable of sliding movement. The screen unit a2 includes a slide plate d passing through a guide hole c provided in the case body a1, and a plurality of (for example, two) filtration screens f attached to the slide plate d.

  Then, when clogging occurs in one screen f, the screen unit a2 can be switched to the other new screen f by repositioning the screen unit a2 in the X-axis direction.

  Here, in order to slide the screen unit a2 smoothly, a slight gap g is formed between the guide hole c and the screen unit a2. However, this causes a problem that a part of the extruded material leaks from the gap g. In particular, on the rear side (upstream side) in the extrusion direction with respect to the screen f, the pressure P becomes high due to the passage resistance of the screen f and the like, so that a leak occurs notably.

  Therefore, as shown in FIG. 6, the following Patent Document 1 describes that a ring-shaped sealing material h attached to the side surface of the guide hole c to seal between the screen unit a2 is provided. Such a sealing material h has a constant pressing force with the screen unit a2. Therefore, when the pressing force is set to a large value, the resistance when sliding the screen unit a2 is increased, which results in the loss of smoothness. On the other hand, when the pressing force is set small, the sealing effect becomes insufficient, and a leak tends to occur from the gap g1 on the rear side in the extrusion direction with respect to the screen f. As described above, there is a trade-off relationship between the smoothness of the slide movement and the sealability, and it was a difficult problem to fully satisfy both.

Japanese Patent Application Laid-Open No. 6-320533

  Then, this invention makes it a subject to provide the screen changer which can improve sealing performance, ensuring the smoothness of the slide movement in a screen unit.

The present invention is a sliding screen changer having a screen for filtering material extruded from an extruder.
A case body fixed to the front end of the extruder and having a guide hole extending in the X-axis direction perpendicular to the extrusion direction;
A screen unit in which a plurality of filtration sets including the screen for filtration and a breaker plate are juxtaposed in the X-axis direction on a slide plate guided slidably in the X-axis direction in the guide hole;
And a first side surface which is a side surface on the rear side in the extrusion direction of the guide hole, and a seal ring for sealing between the screen unit and
Between the seal ring and the screen unit, a gap portion having a substantially V-shaped cross section which widens radially inward is provided, and a part of the extruded material from the extruder flows into the gap portion. The entire seal ring is moved rearward in the extrusion direction and pressed against the first side surface to seal between the first side surface.

  In the screen changer according to the present invention, the filter set includes a screen holding ring disposed on the rear side in the extrusion direction of the screen, and between the side surface on the rear side in the extrusion direction of the screen holding ring and the seal ring. It is preferable that the screen holding ring presses and holds the screen against the breaker plate by forming the gap portion and a part of the extruded material from the extruder flows into the gap portion.

  In the screen changer according to the present invention, it is preferable that the seal ring protrudes rearward with respect to the side surface of the slide plate in the extrusion direction, and has a gap of 3 mm or more between the first side surface and the slide plate. .

  The present invention comprises a seal ring for sealing between the first side surface of the guide hole and the screen unit as described above, and is widened radially inward between the seal ring and the screen unit. A gap portion having a substantially V-shaped cross section is formed.

  Therefore, a part of the extruded material from the extruder flows into the gap in a wedge shape. Here, during operation of the extruder, the pressure of the extruded material is high. Therefore, during operation of the extruder, the entire seal ring is moved rearward in the extrusion direction and strongly pressed against the first side surface by the wedge-shaped extruded material flowing at a high pressure. As a result, it is possible to enhance the sealing performance between the first side and the seal ring, and hence between the first side and the screen unit.

  Conversely, when switching the screen, the operation of the extruder is stopped. Therefore, the pressure of the extruded material decreases, and the pressing force on the first side of the seal ring also decreases accordingly. As a result, the resistance when sliding the screen unit is reduced, and smoothness can be ensured.

It is a perspective view which shows one Example of the screen changer of this invention. It is the fragmentary sectional view which looked at a screen changer from the upper part. It is an exploded perspective view showing a screen unit. It is sectional drawing which looked at the screen unit from the side. It is the elements on larger scale which show the peripheral part of a seal ring. It is sectional drawing which shows an example of the conventional screen changer.

Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIGS. 1 and 2, the screen changer 1 of the present embodiment is a slide-type screen changer that filters the extruded material from the extruder 2. The screen changer 1 comprises at least a block-like case body 3 fixed to the front end of the extruder 2 and a slidable screen unit 4 having a screen 12 for filtration.

  The extruder 2 is an extruder which extrudes and extrudes extrusion materials, such as unvulcanized rubber, resin, etc., for example, and the thing of the conventional various structures is adopted suitably. The extruder 2 in this example includes a cylinder barrel 5 extending in the extrusion direction, and a screw shaft 6 housed in the cylinder barrel 5. Then, by the rotational driving of the screw shaft 6 by the electric motor, the extruded material introduced from the hopper 5A is pushed out from the discharge port 5B opened at the front end of the cylinder barrel 5.

  Next, the case body 3 of the screen changer 1 is fixed to the front end of the cylinder barrel 5. The case body 3 includes a material flow path 7 for receiving the extruded material from the extruder 2 and a guide hole 8 for guiding the screen unit 4.

  The material flow path 7 is continuous with the discharge port 5B and extends in the extrusion direction. The guide hole 8 has, for example, a rectangular shape in cross section, extends in the X-axis direction perpendicular to the extrusion direction, and intersects the material flow path 7. The material flow path 7 is divided into a first flow path portion 7A on the rear side in the extrusion direction and a second flow path portion 7B on the front side.

  The screen unit 4 includes a slide plate 9 slidably guided in the guide hole 8 in the X-axis direction, and a plurality of (two in this example) filter sets 10 attached to the slide plate 9. .

  As shown in FIGS. 3 and 4, in the slide plate 9, a plurality of storage holes 11 for storing and holding the filtration sets 10 concentrically are arranged in parallel in the X-axis direction. The storage hole 11 of this example is formed in a stepped hole shape having a first hole 11A on the rear side in the extrusion direction with a large inner diameter and a second hole 11B on the front side with a small inner diameter.

  Each filtration set 10 includes a mesh screen 12 for filtration and a breaker plate 13 supporting the screen 12. The breaker plate 13 has a large diameter first body 13A to be inserted into the first hole 11A, a small diameter second body 13B to be inserted into the second hole 11B, and a rear side of the first body 13A. It has a stepped disc-like shape including a third body 13C of a small diameter connected to the second body 13C. Further, the breaker plate 13 is formed with a plurality of small holes 13H through which the extrusion material passes by penetrating in the extrusion direction. The screen 12 is adjacent to the rear side in the pushing direction of the breaker plate 13.

  The filter set 10 of this example further includes a screen holding ring 14 disposed on the rear side in the extrusion direction of the screen 12. The screen holding ring 14 has an annular shape extending along the outer peripheral edge of the screen 12, and holds the screen 12 between the screen holding ring 14 and the breaker plate 13.

  The screen changer 1 further includes a seal ring 15 for sealing between the screen unit 4 and a first side surface S 1 which is a side surface on the rear side in the extrusion direction of the guide hole 8. Further, between the seal ring 15 and the screen unit 4, a gap portion 16 having a substantially V-shaped cross section which widens inward in the radial direction is provided.

As shown in FIG. 5, the seal ring 15 of this example includes a base 15A held by the screen unit 4 and a seal portion 15B extending radially inward from the base 15A along the first side surface S1. In this example, the case where the seal ring 15 has a substantially L-shaped cross section including the base portion 15A and the seal portion 15B is shown.

  The base portion 15A includes an inner circumferential surface 11s of the housing hole 11 (in the present embodiment, an inner circumferential surface 11As of the first hole 11A) and an outer circumferential surface 13s of the breaker plate 13 (in the present embodiment, the third body portion). It is held between the outer peripheral surface 13Cs of 13C and the outer peripheral surface 13Cs).

  The seal portion 15B is interposed between a second side surface S2 which is a side surface on the rear side in the extrusion direction of the filter set 10 and the first side surface S1. In the present embodiment, the side surface on the rear side in the extrusion direction of the screen holding ring 14 constitutes the second side surface S2.

  Then, the gap portion 16 is formed between the seal portion 15B and the second side surface S2. The gap 16 is in communication with the material flow path 7. In this example, the second side surface S2 forms an inclined surface 17 which is inclined inward in the extrusion direction toward the radially inward direction, whereby the gap portion 16 is formed in a substantially V-shaped cross section. Be

  Thus, the gap portion 16 is formed between the seal portion 15B and the second side surface S2, and the gap portion 16 is opened to the material flow path 7 in a substantially V shape. Therefore, a part of the extruded material from the extruder 2 wedges into the gap 16.

  Here, during operation of the extruder 2, the screen 12 and the breaker plate 13 provide passage resistance, so that the pressure of the extruded material is higher on the rear side than the screen 12. Accordingly, while the extruder 2 is in operation, the entire seal ring 15 slides rearward in the extrusion direction and is strongly pressed against the first side surface S1 by the wedge-shaped extrusion material that enters under high pressure. As a result, it is possible to enhance the sealing performance between the first side surface S1 and the seal portion 15B, and hence between the first side surface S1 and the screen unit 4. Conversely, the screen unit 4 is pushed forward in the extrusion direction by the wedge-shaped extrusion material. Therefore, there is no gap between the side surface on the front side in the extrusion direction of the breaker plate 13 and the guide hole 8, and the leakage of the extruded material from there is prevented even without the seal material.

  On the other hand, when the screen 12 is switched, the operation of the extruder 2 is stopped. Therefore, the pressure of the extruded material decreases, and the pressing force of the seal portion 15B on the first side surface S1 also decreases. As a result, the resistance at the time of sliding the screen unit 4 in the X-axis direction is reduced, and the smoothness of the sliding movement can be ensured. In order to further enhance the smoothness of the slide movement, as shown in FIG. 5, the seal ring 15 is protruded to the rear side in the pushing direction with respect to the side surface of the slide plate 9 and the first side surface S1 and the slide plate 9 It is preferable to provide a gap D of 3 mm or more between them. As a result, when the screen unit 4 slides, the sliding resistance due to the extruded material that has entered the gap 16 can be reduced.

  Further, in the present embodiment, the rear side surface of the screen holding ring 14 constitutes the second side surface S2. Therefore, while the extruder 2 is in operation, the screen holding ring 14 can strongly press the screen 12 against the breaker plate 13 due to the wedge-shaped extrusion material entering at high pressure. That is, the holding power to the screen 12 can be increased.

  The gap portion 16 may be formed into a substantially V-shaped cross section by replacing the second side surface S2 with the side surface 15Bs on the front side of the seal portion 15B as an inclined surface that is inclined rearward in the extrusion direction. Further, both the second side surface S2 and the side surface 15Bs may be inclined surfaces.

  As shown in FIGS. 1 and 2, the sliding movement of the screen unit 4 is performed by the hydraulic cylinder 20 in this example. Specifically, the cylinder 20 is supported on the side surface of the case main body 3 via, for example, a U-shaped mounting base 21. The side surface of the screen unit 4 is connected to the rod end of the cylinder 20 extending in the X-axis direction. Reference numeral 22 in FIG. 1 denotes an extrusion head attached to the front side of the screen changer 1 to form a filtered extrusion member. Further, reference numeral 23 in FIG. 4 is a bearing member attached to the inner surface of the guide hole 8, and reduces the sliding resistance with the screen unit 4 at the time of sliding movement.

  As mentioned above, although the especially preferable embodiment of this invention was explained in full detail, this invention can be deform | transformed into a various aspect, and can be implemented, without being limited to embodiment of illustration.

DESCRIPTION OF SYMBOLS 1 screen changer 2 extruder 3 case main body 4 screen unit 8 guide hole 9 slide plate 10 filter set 11 storage hole 11s inner peripheral surface 12 screen 13 breaker plate 13s outer peripheral surface 14 screen holding ring 15 seal ring 15A base 15B seal portion 16 gap Part 17 Sloped surface S1 first side S2 second side

Claims (3)

A sliding screen changer having a screen for filtering material extruded from an extruder, comprising:
A case body fixed to the front end of the extruder and having a guide hole extending in the X-axis direction perpendicular to the extrusion direction;
Wherein the guide bore in the slide plate is slidably guided in the X-axis direction, a screen unit and said screen and breaker plate for filtration was attached to including Filtration set
And a first side is a side of the extrusion direction rear side of the guide hole, the Shirurin grayed to seal between said screen unit comprising,
Between the sealing ring and the screen unit, comprising a substantially V-shaped cross section of the gap to be wider toward the radially inward, wherein a portion of the extruded material from the extruder to flow into the gap Thus, the entire seal ring is moved rearward in the extrusion direction and pressed against the first side surface to seal between the first side surface and the screen unit . A sliding screen changer having a screen for filtering material extruded from an extruder, comprising:
A case body fixed to the front end of the extruder and having a guide hole extending in the X-axis direction perpendicular to the extrusion direction;
A screen unit in which a filtration set including the screen for filtration and the breaker plate is attached to a slide plate guided slidably in the X-axis direction in the guide hole;
And a seal ring which is held by the screen unit and which seals between the screen unit and a first side surface which is a side surface on the rear side in the extrusion direction of the guide hole.
Between the seal ring and the screen unit, a gap portion having a substantially V-shaped cross section that widens radially inward is provided, and a part of the extruded material from the extruder flows into the gap portion. Thereby, the entire seal ring is moved rearward in the extrusion direction and pressed against the first side surface to seal between the first side surface and the screen changer. The filter set is disposed on the rear side in the extrusion direction of the screen and has a screen holding ring, and the gap is formed between the side surface on the rear side in the extrusion direction of the screen holding ring and the seal ring. The screen changer according to claim 1 or 2 , wherein the screen holding ring presses and holds the screen against the breaker plate by the flow of a part of the extruded material from the extruder into the section.

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