JPS6225490B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen exchange device for an extruder.

An extruder used for molding plastics, etc. is equipped with a passing device 1 as shown in FIG. 1, for example, in a head portion that connects a screw and a die. This filtering device 1 has two holes 3 in a slide plate 2 that can move at right angles to the extrusion direction, and a breaker plate 4 and a screen wire mesh 5 are installed in each hole 3 as shown in FIG.
is built in and fixed with a snap spring 6.
When foreign matter (stones, copper wire, etc.) accumulates on this wire mesh 5 and the back pressure of the extruder increases, the screw rotation speed of the extruder is lowered and the slide plate 2 is momentarily moved by the hydraulic cylinder 7 (Fig. 1). Then, a new wire mesh is set in the extruder. Furthermore, using a jig or the like, manually remove the snap spring 6 from the hole 3 where the wire mesh 5 to which the foreign matter and resin have accumulated is removed.
After removing the snap ring 6 and the inside of the hole 3 with a knife or the like, a new wire mesh and the cleaned snap ring 6 are installed in the hole 3. However, this kind of wire mesh replacement work is (1) time-consuming because it is all done manually;

(2) The slide plate 2 is normally kept at a high temperature, making it dangerous to work on it.

(3) Cleaning the snap spring 6 and the hole 3 is complicated.

(4) When using materials with a lot of foreign matter, the exchange cycle is quick and the extruder output rate (material input amount, screw rotation speed) must be reduced.

There were other problems.

Therefore, an extruder screen replacement device has been proposed that allows the screen to be replaced efficiently and safely. That is, as shown in FIGS. 3 and 4, this extruder screen replacement device includes a breaker plate 9 installed in the hole 3 of the slide plate 2 and having a through hole 8 in the extrusion direction near the outer periphery; An annular shape having legs 10 slidably fitted into the through holes 8, contacting the outer periphery of the front surface of the wire mesh 5 attached to the rear surface of the breaker plate 9, and sliding into the holes 3 of the slide plate 2. Part 1
a slide ring 12 as shown in FIG.
The slide ring pusher 14 is configured to move the legs 10 of the slide ring 12 rearward using a hydraulic cylinder 13 to eject and remove the wire mesh 5 rearward via the slide ring 12, and the slide plate 2 is moved by an air cylinder 15. It is equipped with a scraper 16 that moves forward and backward along the rear surface, and a wire mesh installation jig 18 that is operated by a hydraulic cylinder 17 to press fit a new wire mesh 5' into the hole 3 in the slide plate 2. The ring pusher 14 and the wire mesh mounting jig 18 are installed facing each other with the slide plate 2 in between, and the wire mesh mounting jig 18 is provided with a guide 19 and a spring 20. Furthermore, the air cylinder 15 that operates the scraper 16 is a scraper pulling air cylinder 20' that operates in the front and back direction of the slide plate 2.
The scraper 16 is installed at the movable end of the slide plate 2 so that the scraper 16 is brought into pressure contact with the rear surface of the slide plate 2 when the scraper 16 is operated.

Also, the wire mesh 5 for the screen used here,
5' is a ring formed by bending the steel band 21 into a groove shape, with an edge around the circumference, and the outer diameter of the edge is slightly larger than the inner diameter of the hole 3 of the slide plate 2. The wire meshes 5 and 5' are attached to the wire meshes 5 and 5' in a press-fitted state.

With this configuration, the wire meshes 5, 5' can be automatically replaced by operating as follows.

(1) Slide ring pusher 14 to hydraulic cylinder 1
3 and press the leg part 10 of the slide ring 12 with its tip to move the annular part 11 to the rear end of the slide plate 2, push out the wire mesh 5 toward the rear face of the slide plate 2, and press the leg part 10 of the slide ring 12 with its tip. The inner circumferential surface of the hole 3 is cleaned by the section 11.

(2) Operate the scraper pulling air cylinder 20' to bring the tip of the scraper 16 into contact with the rear surface of the slide plate 2.

(3) Operate the air cylinder 15 to remove the scraper 16.
is slid along the rear surface of the slide plate 2, the wire mesh 5 pushed out by the slide ring 12 falls off, and the surface of the annular portion 11 of the slide ring 12 is cleaned.

(4) The scraper 16 is separated from the slide plate 2 by the scraper pulling air cylinder 20', and then removed from the rear surface of the slide plate 2 by the air cylinder 15.

(5) The slide ring pusher 14 is removed from the breaker plate 9 by the hydraulic cylinder 13.

(6) Place a new wire mesh 5' on the guide 19, operate the hydraulic cylinder 17, move the wire mesh installation jig 18 toward the hole 3 of the slide plate 2, and install the wire mesh 5' and slide ring 12. Return to original position.

(7) Operate the hydraulic cylinder 17 to install the wire mesh installation jig 1.
8 and complete the work.

That is, by using this device, manual work can be completely eliminated, and the wire mesh replacement work can be made safer.

However, as shown in FIG. 5, the deposits 21 on the wire mesh 5 include resin materials in addition to foreign objects (stones, copper wires, etc.), and this resin material cannot be reused. However, in the state shown in FIGS. 6 and 7, the wire mesh 5 is dropped from the breaker plate 2 together with the wire mesh 5, and when the wire mesh 5 is cleaned, it is thrown away along with the foreign matter, resulting in another problem of large material loss. had.

Therefore, an object of the present invention is to provide a screen exchange device for an extruder that can efficiently and safely exchange screens and reduce material loss.

An embodiment of the present invention will be described with reference to FIGS. 8 to 13. This extruder screen exchange device differs from the above proposed example in that the hydraulic cylinder 1
The only difference is that the slide ring pusher 14 according to No. 3 is capable of extruding backward in two stages, and a slide conveyor 22 is disposed below the rear surface of the slide plate 2 so as to be movable forward and backward by a hydraulic cylinder 23. To explain in detail, as shown in FIGS. 10 and 11, the slide ring pusher 14 pushes the wire mesh 5 through the slide ring 12 to the vicinity of the rear end of the hole 3 of the slide plate 2 in the first stage of extrusion. In the second stage of extrusion,
As shown in FIGS. 12 and 13, the wire mesh 5 is discharged from the hole 3 of the slide plate 2. The other configurations are the same as the above proposed example.

As a result of this configuration, as follows,
Material loss can be reduced.

(1) As shown in Fig. 8, when a large amount of deposits 21 are attached to the wire mesh 5 (the wire mesh 5 is clogged with foreign objects such as stones and copper wires, and resin material is accumulated behind it), the hydraulic The first stage of extrusion is performed by the slide ring pusher 14 via the cylinder 13, and the wire mesh 5 is moved via the slide ring 12 to the vicinity of the rear end of the hole 3 of the slide plate 2, as shown in FIG. .

(2) As shown in Figure 11, the slide conveyor 2
2 to the lower rear surface of the slide plate 2.

(3) The air cylinder 15 lowers the scraper 16 along the rear surface of the slide plate 2, scraping off the deposits 21' (containing no foreign matter and consisting only of resin material) adhering to the rear surface of the wire mesh 5. It is dropped onto the slide conveyor 22.

(4) As shown in Fig. 12, the scraper 16 is raised and the slide conveyor 22 is removed from the lower rear surface of the slide plate 2, and the deposits 21' made of resin material caught on the conveyor 22 are reused. Transport to location.

(5) A second stage of extrusion is performed using the slide ring pusher 14, and the wire mesh 5 is discharged from the hole 3 of the slide plate 2 via the slide ring 12.

(6) Lower the scraper 16 again along the rear surface of the slide ring 12 to remove the wire mesh 5 from the slide ring 12.

(7) Following the same procedure as in the proposed example, as shown in FIG. 13, the slide ring pusher 14 is moved back, and a new wire mesh 5' is attached to the slide plate 2 using the wire mesh mounting jig 18 shown in FIG. Insert into hole 3 of.

In this way, extrusion by the slide ring pusher 14 is divided into two stages, and before the wire mesh 5 is removed from the slide plate 2, the resin material deposit 21' adhering to the rear surface of the wire mesh 5 is scraped off with the scraper 16. Since the wire mesh 5 is transported to the reuse site by the slide conveyor 22, the deposits 21' can be completely scraped off without damaging the wire mesh 5, and material loss can be reduced. Of course, as in the proposed example, the wire mesh 5 can be replaced efficiently and safely.

As described above, the screen exchange device for an extruder of the present invention includes a breaker plate having a through hole in the extrusion direction near the outer periphery installed in the hole of the slide plate, and a breaker plate that is slidably fitted into the through hole. A slide ring with legs and an annular part provided to contact the outer periphery of the front surface of the screen attached to the rear surface of the breaker plate, and the legs of this slide ring are pushed backward in two stages. A slide ring pusher for moving the screen to the vicinity of the rear end of the hole in the slide plate through the slide ring in the first stage of extrusion and ejecting the screen from the hole in the slide plate in the second stage of extrusion; During the first stage of extrusion, the ring pusher advances and retreats along the rear surface of the slide plate to scrape off the deposits on the wire mesh, and during the second stage of extrusion, it also advances and retreats along the rear surface of the slide plate to remove the wire mesh from the slide plate. The screen is equipped with a scraper that allows the screen to fall off from the slide plate, and a screen mounting jig that is operated by fluid pressure to force-fit a new screen into the hole in the slide plate, making it possible to replace the screen efficiently and safely. This has the effect of reducing material loss.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a conventional extruder, Fig. 2 is a sectional view thereof, Fig. 3 is a partially cutaway side view of the proposed example, and Fig. 4 is a perspective view showing the main parts of the extruder. Fifth
7 to 7 are explanatory diagrams showing the drawbacks thereof, FIG. 8 is a partially cutaway front view of an embodiment of the present invention, FIG. 9 is a side view thereof, and FIGS. 10 to 13 are explanatory diagrams of its operation. It is. 2... Slide plate, 3... Hole, 5... Wire mesh, 8... Through hole, 9... Breaker plate, 1
0... Leg portion, 11... Annular portion, 12... Slide ring, 14... Slide ring pusher, 16...
...Scraper, 18...Wire mesh installation jig, 21,2
1'...Adherence, 22...Slide conveyor.

Claims (1)

[Claims] 1. A breaker plate that has a through hole in the extrusion direction near the outer periphery that is installed in the hole of the slide plate, and a front surface of a screen that has legs that are slidably fitted into the through hole and that is installed on the rear surface of the breaker plate. A slide ring with an annular part provided to contact the outer periphery of the slide ring, and the legs of this slide ring are extruded backward in two stages, so that the screen is extruded through the slide ring in the first stage of extrusion. A slide ring push tool that moves the screen to the vicinity of the rear end of the hole in the slide plate and discharges the screen from the hole of the slide plate in the second stage of extrusion, and a rear surface of the slide plate during the first stage of extrusion of this slide ring push tool. A scraper moves back and forth along the slide plate to scrape off any deposits on the wire mesh, and also moves back and forth along the rear surface of the slide plate to remove the wire mesh from the slide plate during the second stage of extrusion. and a screen mounting jig for press-fitting the screen into the hole in the slide plate.