JPH0811193A - Screen replacing device in resin molding machine - Google Patents

Abstract

PURPOSE:To replace a screen without interrpting the flow of a molten resin by providing fitting holes to parallelly arranged divided passages so as to pierce the passages and fitting a screen holding bars each having a bottomed cylindrical strainer and a screen mesh respectively provided to two molten resin holes thereof to the fitting holes in a slidable manner. CONSTITUTION:At the time of the replacement of respective screens 7A-7D, a screen holding bar 9 is advanced by a cylinder 13 and the screens 7C, 7D are exposed to the outside of an apparatus main body 6 and a divided passage 20 is closed by a bar base part 9A. At this time, a molten resin flows through an upper divided passage and the screens 7A, 7B. Next, the contaminated screen meshes of the exposed screens 7C, 7D are taken out of a strainer to be replaced with new screen meshes and the screen holding bar 9 is allowed to retreat by the cylinder 13. Continuously, the screens 7A, 7B are replaced in the same way. Resin holes 23-26 are provided to screen holding bars 8, 9 by two and the screens 7A-7D are attached to them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen changing device for a resin molding machine such as a resin kneading extruder, an injection molding machine, and a kneading and granulating machine.

[0002]

2. Description of the Related Art Generally, a screen is provided between an outlet of a molten resin such as an extruder and an inlet of a molding die (including a granulating die) to filter impurities and the like contained in the molten resin to form a screen mesh ( If the accumulation of impurities etc. on the (mesh) increases,
A device is used to replace a dirty screen with a new screen without stopping the extruder or the like.

Conventionally, as a screen exchange device of this type, Japanese Patent Application Laid-Open No. 47-39160 and Japanese Patent Publication No. 59-27.
The one described in Japanese Patent No. 698 is known. FIG.
Is a screen exchange device described in JP-A-47-39160, and a slide bar 116 slidably installed between a molten resin outlet 113 of an extruder 112 and an inlet 115 of a molding die 114, Resin passages 117A, 11 provided crossing each other in the moving direction of the slide bar 116
Breaker plates 118A, 1 installed on 7B, respectively
18B and seven bottomed cylindrical screens 119A and 119B respectively inserted through the breaker plate.

In the apparatus 111, when the screen 119A is replaced, the slide bar 116 is slid so that the one screen 119A is moved to the molten resin outlet 11 of the extruder 112.
No. 3 and the inlet 115 of the molding die 114, and the other screen 119B is moved between the molten resin outlet 113 of the extruder 112 and the inlet 115 of the molding die 114, and one screen 119A is replaced with a new one. Exchange.

FIG. 14 shows a screen changing apparatus described in Japanese Patent Publication No. 59-27698, which is provided with two resin flow paths 122A and 122B and has one through-hole 123A installed orthogonal to each of the flow paths. , 123B, slide bars 125A and 125B slidably mounted in the respective holes, and breaker plates 127A and 127B mounted in resin through holes provided in the respective bars.
And screens 128A and 128B.

In the device 121, a screen 128A,
When replacing 128B, one slide bar 125A
To block the resin flow path 122A and expose the screen 128A from the body 124, and while allowing the resin to flow through the other screen 128B, replace one screen 128A with a new one and slide the slide bar 125A. The resin channel 122A can be opened by moving it, and then the other slide bar 125B can be slid to replace the screen 128B.

[0007]

By the way, in the former device 111 of the related art, the bottomed cylindrical screens 119A, 11 are used.
Although the filtration area of the resin can be increased by increasing the number of 9B, when the screen 119 is replaced, the flow of the molten resin is interrupted and the screen 11
Since there are many 9 breaker plates 118A, 118
Since the breaker plates 118A and 118B are heavy and hot in a large-sized plant, they have to be replaced all together, and there is a problem that the replacement work is troublesome and cleaning is difficult.

Further, in the latter device 121 of the related art, since the resin flow path is divided into two, the screen 128A,
When the 128B is exchanged, there is an advantage that the flow of the resin is not interrupted and the exchange operation is easy. The slide bars 125A and 125B are rod-shaped, and the conventional breaker plates 127A and 127B are generally round (circular) because of easy processing. However, in order to increase the filtration area, the diameter of the slide bar must be increased if the shape of the breaker plate remains the conventional round shape (circular shape), resulting in an increase in the size of the body and, consequently, the size of the entire device. It was also a big problem in terms of connection, space and cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object the purpose of replacing a screen without interrupting the flow of molten resin, making it easy to clean. It is an object of the present invention to provide a screen changing device in a plastic molding machine capable of increasing a resin filtration area.

[0010]

In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is a screen exchange device in a resin molding machine that is provided at a molten resin outlet such as an extruder and filters impurities in the molten resin, wherein a resin passage is provided at an intermediate position from an inlet to an outlet of the molten resin. An apparatus main body, which is divided in parallel and in which a screen holding bar fitting hole substantially orthogonal to the passage is provided in a penetrating manner in the divided passage, and a slidable and penetrating shape in the fitting hole of the main body, respectively. A screen holding bar fitted into the bar, a bottomed cylindrical strainer and a screen connected to the bar and connected to one or two molten resin through-holes provided orthogonal to the bar axis direction. And a screen comprising one mesh.

Further, the present invention is characterized in that the screen mesh of the screen is detachably attached to a strainer. Further, the present invention is a screen replacement device in a resin molding machine which is provided at a molten resin outlet of an extruder or the like and filters impurities in the molten resin, wherein a resin passage is provided in the middle from the molten resin inlet to the outlet. An apparatus main body which is divided in parallel and has a screen holding bar fitting hole penetratingly provided in the divided passage in a direction substantially orthogonal to the passage, and a slidable penetrating hole in the fitting hole of the main body. A screen holding bar fitted to the bar, and a screen attached to each of the one or two molten resin through holes communicating with the divided passage in the bar and orthogonal to the axial direction of the bar, respectively. A breaker plate having a large number of through holes attached to the outflow side of the screen,
The cross-sectional shape of at least the resin inflow side of the molten resin through hole is rectangular, and a rectangular screen and a breaker plate are attached to the resin inflow side of the through hole.

Further, the present invention is characterized in that a seal wall is provided in a resin through hole of the breaker plate or the screen holding bar.

[0013]

According to the present invention, the molten resin introduced from the outlet of the extruder or the like is filtered by the respective screen meshes through the respective divided passages, joined again, and guided to the molding die or the like. Therefore, when replacing the screen, one of the screen holding bars is slid to expose the screen, and one of the divided passages is blocked by the screen holding bar, and the other screen is used to circulate the molten resin while exposing the exposed screen. After replacing only the dirty screen mesh with a new screen mesh, one of the screen holding bars is again slid in the opposite direction to return the screen into the divided passage.

Subsequently, the other screen holding bar is slid to expose the screen, and the screen holding bar closes the other divided passage, and one exchanged screen allows the molten resin to flow while being exposed. After the dirty screen mesh of the screen is replaced with a new screen mesh, the other screen holding bar is again slid in the opposite direction to return the screen into the divided passage to allow the molten resin to flow.

Further, by making the shape of the breaker plate quadrangular, as is apparent from FIG. 7, it is possible to obtain a larger filtration area than the conventional screen without changing the diameter of the clean holding bar. For this reason, large-scale filtration becomes possible, and an increase in production is expected. Also,
By making the shape of the breaker plate square, and providing a seal wall in the resin through hole of the breaker plate or the screen holding bar, the molten resin does not flow out of the device, and the gap between the device body and the screen holding bar is eliminated. The sealing portion can be shortened, so that the size of the apparatus main body can be reduced, the processing accuracy of the apparatus can be improved, and the processing cost can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention, in which 1 is a screen changer, which is a plastic molding machine such as an extruder 2.
Is provided between the molten resin outlet 3 and the molten resin inlet 5 of the molding die 4.

The screen exchange device 1 comprises a device body 6 in the shape of a rectangular parallelepiped, a screen 7, a screen holding bar 8,
9, a cylinder mounting member 10 and a support rod 11 fixed to the main body 6, and cylinders 12 and 13 which are sliding driving means of the bars 8 and 9, and include the screen 7
Is a bottomed cylindrical strainer 1 made of a perforated plate as shown in FIG.
4 and a bottomed cylindrical screen mesh 15 fitted in the strainer 14 and a mesh pressing ring 16 so that only the screen mesh 15 can be replaced.

In the apparatus main body 6, a resin passage is divided into two in parallel in the middle from the molten resin inlet 17 to the outlet 18.
Screen holding bar fitting holes 21 and 22 are provided in the respective divided passages 19 and 20 in a direction orthogonal to the passages 19 and 20 in a penetrating manner, and the screen holding bar 8 is provided in the fitting holes 21 and 22. , 9 are slidably inserted in a penetrating manner.

The screen holding bars 8 and 9 are made of round bars, and the length thereof is about twice the length of the fitting holes 21 and 22 of the apparatus main body 6, and two molten resin are provided at the tips thereof. Through holes 23, 24, 25, and 26 are provided in a direction orthogonal to the axial direction of the bars 8, 9 and adjacent to each other, and the screens 7A, 7B, 7C, and 7D are detachable from the through holes 23 to 26. So that the through-holes 23 to 26 of the bars 8 and 9 can communicate with the divided passages 19 and 20 respectively. Has become.

The outer ends of the piston rods 27, 28 of the cylinders 12, 13 are detachably connected to the base ends of the bars 8, 9, respectively.
8 in the retracted state, the divided passages 19 and 20 communicate with the through holes 23 to 26, and the piston rods 27 and 28 are advanced so that the divided passages 19 and 20 are connected to the base portions 8A of the screen holding bars 8 and 9. 9A, the molten resin is blocked from flowing, and each screen 7 is attached to the apparatus main body 6
It is exposed to the outside and can be replaced.

Next, in the above embodiment, the screen 7
The replacement procedure will be described with reference to FIG. Figure 5
In (I), the molten resin from the extruder 2 is
The molten resin flowing into the inlet 17 of the apparatus main body 6 as shown by the arrow in FIG.
The divided passages 19 and 20 flow into the insides of the screens 7A to 7D, pass through the screen mesh 15 from the inside to the outside, pass through the holes of the strainer 14, and reach the outside of the screens 7A to 7D. 19, 2
Through 0, it reaches the outlet 18 and flows to the resin inlet 5 of the molding die 4.

Therefore, when impurities or the like are deposited on the screens 7A to 7D and the screens 7A to 7D are contaminated, the cylinders 12 on the upper side (one side) are replaced as shown in FIG. 5 (II) in order to replace the screens 7A and 7B first. To activate the screen holding bar 8
To expose the screens 7A and 7B to the outside of the main body 6 of the apparatus, and at the same time, to divide the upper divided passage 1 by the bar base 8A.
Block 9 At this time, the molten resin flows through the lower (other) division passage 20 and the screens 7C and 7D and is supplied to the inlet 5 of the molding die 4 without interruption.

Next, the exposed screens 7A and 7B are exposed.
Remove each holding ring 16 of the strainer 14 from the strainer 14 and remove only the dirty screen mesh 15 from the strainer 1.
4), fit a new screen mesh 15 into the strainer 14, and attach the presser ring 16 to the strainer 1.
4, the screen mesh 15 is fixed, and then the upper screen holding bar 8 is retracted by the cylinder 12 to obtain the state shown in FIG. 5 (III).

Subsequently, as shown in FIG. 5 (IV), the lower (other) cylinder 13 is operated to advance the screen holding bar 9, thereby exposing the screens 7C and 7D to the outside of the apparatus main body 6, and The lower divided passage 20 is closed by the bar base 9A. At this time, the molten resin flows through the upper (one) divided passage 19 and the screens 7A and 7B,
It is supplied to the inlet 5 of the molding die 4 without interruption.

Then, both exposed screens 7C, 7
Each pressing ring 16 of D is removed from the strainer 14, only the dirty screen mesh 15 is extracted from the strainer 14, a new screen mesh 15 is fitted into the strainer 14, and the pressing ring 16 is attached to the strainer 14 to attach the screen mesh 15 to the screen mesh 15. After fixing
The screen replacement work is completed by retracting the lower screen holding bar 9 by the cylinder 13 and bringing it to the state shown in FIG. 5 (V).

According to the first embodiment, the screen holding bars 8, 9 are provided with two resin through holes 23 to 26, respectively.
Since the screen 7A is attached, the filtration area of the molten resin can be greatly increased to eliminate the pressure loss, and moreover, only the screen mesh 15 can be easily replaced without interrupting the flow of the molten resin. Therefore, it is possible to shorten the screen replacement work time and improve workability. Further, since the screen mesh 15 can be replaced without removing the strainer 14, the strainer 14 does not need to be removed and cleaned, which saves the trouble.

FIG. 6 shows a main part of a second embodiment of the present invention. The difference from the first embodiment is that the screen 7 is mounted in each of the passages 23 to 26 in a direction opposite to the flow of the molten resin. And the screen mesh 15 is fitted outside the strainer 14 in the same manner as in the first embodiment.
Only the screen mesh 15 can be replaced, and the same effect as that of the first embodiment can be expected. Therefore,
The same reference numerals as in FIG. 1 are given and the description thereof is omitted.

According to the second embodiment, when the screen mesh 15 is replaced, the resin adhering to the outside of the screen mesh 15 may be removed. Since the amount of resin is small, the workability is better than that of the first embodiment. improves. 7 and 8 show
An embodiment of the screen exchange device 30 according to the invention of claim 3 is shown, which is provided between the molten resin outlet 3 of the extruder 2 and the molten resin inlet 5 of the molding die 4 as in the first embodiment. ing. Note that, of the configuration of the screen exchange device 30, portions common to the first embodiment are shown in FIGS.
The same reference numerals as those in FIG.

The screen holding bars 8 and 9 of the screen exchanging device 30 are provided with respective molten resin through holes 31 and 32, and the resin inflow sides 31A and 32A have a quadrangular cross-sectional shape and the resin outflow sides 31B and 32B. Is circular, and the cross-sectional area of the resin inflow side 31A, 32A is sufficiently larger than the cross-sectional area of the outflow side 31B, 32B.

A rectangular plate-shaped breaker plate 33 having substantially the same cross-sectional area is detachably mounted on the resin inflow sides 31A, 32A of the molten resin through holes 31, 32, respectively. On each side, square screens 34 are interchangeably mounted. By making the breaker plate 33 into a quadrangle, the screen holding bars 8 and 9 having the same diameter greatly increase the resin filtration area and reduce the pressure loss as compared with the circular breaker plate shown by the two-dot chain line R in FIG. Moreover, only the screens 34, 34 can be easily replaced without interrupting the flow of the molten resin.

In the apparatus 30 of the embodiment, FIG.
As shown in the figure, the center of each breaker plate 33 (the center of the through holes 31, 32 in the longitudinal direction of the bars 8, 9)
Seal wall 35 having the same diameter as the outer diameter of screen holding bars 8 and 9
Is provided, the length of the seal sleeve 36 between the apparatus main body 6 and the screen holding bars 8 and 9 can be shortened.

That is, as shown in FIG. 10, when no seal wall is provided on the breaker plate 33, the seal sleeve 3
When 6 is short, when the screen holding bars 8 and 9 are slid in the direction shown by the arrow (a) in the drawing when the screen is replaced, the molten resin flows out through the through holes 31 and 32, so that the seal sleeve 36 is sealed. The length must be long enough. However, by providing the seal wall 35, even if the resin inflow side through hole 31A is in communication with the divided passage 19, when the seal wall 35 is separated from the divided passage 19, the molten resin is no longer blocked by the seal wall 35. ,
It does not flow out of the apparatus body 6.

Screen 3 in device 30 of the above embodiment
The replacement procedure of No. 4 is the same as that of the first embodiment, and the description is omitted. In the above-described embodiment device 30, the seal wall 35 provided on the breaker plate 33 is the same as that shown in FIGS.
As shown in FIG. 2, the resin holding holes 31 and 32 of the screen holding bars 8 and 9 can be provided at the center so as to divide the resin holding holes 31 and 32 into two parts.
5 is formed and the breaker plate 3 is formed in each of the divided through holes.
3 and the screen 34 may be provided so that only the screen 34 can be replaced.

In the apparatus 30 of the embodiment, the number of the resin through holes 31 and 32 of each of the screen holding bars 8 and 9 can be set to two, and can be operated as in the first embodiment. In the first and second embodiments, if the filtration area can be small with a small machine, each of the screen holding bars 8 and 9 has one resin through hole, and one screen 7 is provided for each of the bars 8 and 9. Can be provided.

The present invention is not limited to the above embodiment, but the design can be changed appropriately.

[0036]

According to a first aspect of the present invention, there is provided a screen exchange device in a resin molding machine provided at an outlet of a molten resin such as an extruder for filtering impurities in the molten resin. An apparatus body in which a resin passage is divided in parallel at an intermediate position, and a screen holding bar fitting hole substantially orthogonal to the passage is provided in the divided passage in a penetrating manner, and a sliding hole is provided in the fitting hole of the body, respectively. A screen holding bar movably and penetratingly fitted, and bottoms respectively connected to one or two molten resin through-holes which communicate with the divided passages in the bar and are provided orthogonal to the bar axis direction. It is characterized by having a cylindrical strainer and a screen consisting of one screen mesh, so that the screen can be replaced without interrupting the flow of the molten resin, and furthermore, the screen mesh Mino can workability because good in exchange performed well and efficiently, are more easy to clean,
In addition, the pressure loss can be prevented by increasing the filtration area of the molten resin.

A third aspect of the present invention is a screen exchange device in a resin molding machine which is provided at an outlet of a molten resin such as an extruder and filters impurities in the molten resin. An apparatus main body in which a resin passage is divided in parallel in the middle of the main body, and a screen holding bar fitting hole that is substantially perpendicular to the passage is provided in the through-hole in the passage, and the fitting hole of the main body is provided in the body. A screen holding bar slidably and penetratingly fitted, and one or two molten resin through-holes which communicate with the divided passages in the bar and are provided orthogonal to the bar axis direction. And a breaker plate having a large number of through holes respectively attached to the outflow side of the screen, wherein at least the cross-sectional shape of the molten resin through hole on the resin inflow side is square, and It since characterized in that square-shaped screen and breaker plate to the resin inlet side of the hole is attached, can be secured a large filtration area, large amounts filtration becomes possible and can realize an improvement in productivity.

Further, the invention of claim 4 is characterized in that a seal wall is provided in the resin through hole of the breaker plate or the screen holding bar.
The sealing portion between the apparatus main body and the screen holding bar can be shortened, and the size of the apparatus main body can be reduced, so that the processing accuracy of the apparatus can be improved and the processing cost can be reduced.

[Brief description of drawings]

FIG. 1A shows a first embodiment of the present invention of FIG.
FIG. 4 is an enlarged cross-sectional view taken along line A.

FIG. 2 is a partially cutaway front view of the same embodiment.

3 is a partially cutaway plan view of FIG. 2. FIG.

FIG. 4 is an enlarged perspective view of the screen according to the embodiment.

FIG. 5 is an explanatory diagram of a screen replacement work procedure of the present invention.

FIG. 6 is a sectional view showing an essential part of a second embodiment of the invention (FIG.
(Corresponding to a cross section taken along line AA in FIG.

FIG. 7 is a partially cutaway front view showing an embodiment of the invention of claim 3;

8 is an enlarged cross-sectional view taken along the line BB of FIG.

9 is a cross-sectional view of a portion corresponding to the CC cross section of FIG. 7 showing a modified example of the above embodiment.

10 is a comparative explanatory diagram (corresponding to the CC cross section of FIG. 7) of the above modification.

FIG. 11 is a partially cutaway front view showing another modification of the above embodiment.

FIG. 12 is a sectional view taken along line DD of FIG. 11;

FIG. 13 is a sectional view of a conventional example.

FIG. 14 is a cross-sectional view of another conventional example.

[Explanation of symbols]

 1,30 Screen Exchange Device 2 Extruder 3 Molten Resin Outlet 4 Mold 5 Resin Inlet 6 Device Main Body 7,7A-7D Screen 8,9 Screen Holding Bar 12,13 Cylinder (Screen Holding Bar Driving Means) 14 Strainer 15 Screen Mesh 17 Inlet 18 Outlet 19,20 Split Passages 21,22 Screen Holding Bar Fitting Hole 23, 24, 25, 26, 31, 32 Molten Resin Through Hole 31A, 32A Resin Inflow Side 31B, 32B Resin Outflow Side 33 Breaker Plate 34 Screen 35 seal wall

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Nakata 2-3-1 Shinhama, Araimachi, Takasago City, Hyogo Prefecture Inside Kobe Steel, Ltd. Takasago Works (72) Inventor Shinichi Fukumizu 2 Araimachi Shinama, Takasago City, Hyogo Prefecture Kobe Steel, Ltd. Takasago Works, Kobe Steel Co., Ltd.

Claims (4)

[Claims] 1. A screen replacement device in a resin molding machine for filtering impurities in a molten resin, which is provided at a molten resin outlet of an extruder or the like, wherein the resin passages are arranged in parallel in the middle from the molten resin inlet to the outlet. An apparatus main body in which a screen holding bar fitting hole that is substantially orthogonal to the passage is provided in a penetrating manner in the divided passage, and a slidable and penetrating shape in the fitting hole of the main body. A fitted screen holding bar, a bottomed cylindrical strainer and a screen mesh that are respectively connected to one or two molten resin through holes that communicate with the divided passages in the bar and are orthogonal to the axial direction of the bar. A screen exchange device in a resin molding machine, characterized in that the screen exchange device comprises one screen each. 2. A screen changing device in a resin molding machine according to claim 1, wherein a screen mesh of said screen is detachably attached to a strainer. 3. A screen exchange device for a resin molding machine provided at an outlet of a molten resin such as an extruder for filtering impurities in the molten resin, wherein a resin passage is arranged in parallel in a middle from an inlet to an outlet of the molten resin. And a device main body in which a screen holding bar fitting hole substantially orthogonal to the passage is provided in the divided passage in a penetrating manner, and a screen holding bar fitting hole of the main body is slidably and penetrating in the fitting passage, respectively. A screen holding bar fitted therein; a screen communicating with the divided passage in the bar and being exchangeably attached to one or two molten resin through holes provided in a direction perpendicular to the axial direction of the bar; A breaker plate having a number of through holes respectively attached to the outflow side of the screen, wherein at least the cross-sectional shape of the molten resin through hole on the resin inflow side is rectangular, and a rectangular shape on the resin inflow side of the through hole. No Screen changer in the resin molding machine, characterized in that the lean and the breaker plate are mounted. 4. The screen changing device in a resin molding machine according to claim 3, wherein a seal wall is provided in a resin through hole of the breaker plate or the screen holding bar.