JPS60225728A - Mouthpiece changing spider of double extrusion molding machine - Google Patents

Abstract

PURPOSE:To secure the sealing properties of the connecting part between both the inside and outside material passage and the mouthpiece by connecting the internal cylinder forming an inside material passage communicated with the mold hole of the mouthpiece and the inside supply passage and the external cylinder forming an outside material passage communicated with the mold hole of the mouthpiece and the outside supply passage arranged outside this internal cylinder in one body with a spoke. CONSTITUTION:The fixed spider 11 and the movable spider 17 are stuck easily and securely by the pushing force of the push member 29 since the joint surfaces of both spiders 11, 17, that is, the front end and the rear end are formed on the same surface. Further, the front end of the internal cylinder 52 of the movable spider 17 is stuck by screw fixing to the movable plate of the movable spider 17 to the rear circumferential edge part of the mouth piece 16 and the front end part of the external cylinder 53 of the movable spider 17 is covered with the external circumferential surface in front of the mouth piece 16, the inside material sent through the inside supply passage 6, the inside material passages 40, 50 the outside material sent through the outside supply passage 8, the outside material passages 41, 51 are extended and molded at the mold hole 20 of the mouth piece 16 and then mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spider for changing the mouthpiece of a double extrusion molding machine.

Prior Art Fig. 1 shows the general structure of a double extrusion molded product, and A shows an automobile weather strip, with a 6-part sponge molded part a1 and a solid part covering the outside of this 6 part a1. It consists of a molded outer skin a2.

By the way, when this type of double extrusion molding is performed simultaneously in a single die, the inner material forming the 6 part a1 and the outer material forming the outer skin a2 are extruded from the nozzles of separate extrusion molding machines into the die. Care must be taken to avoid mixing in the passages that feed into the mold cavity. Therefore, when the cap is replaced by moving the cap in a direction intersecting both material passages, it is difficult to ensure sealing performance at the connection portion between both material passages and the cap.

Furthermore, when moving the nozzle, the molten material is sheared by moving the nozzle, but a large shearing force is required due to the viscous resistance of the molten material.

Purpose of the Invention In view of the conventional situation described above, the present invention provides a double extrusion method that can ensure the sealing performance of the connecting portion between both the inner and outer material passages and the mouthpiece, and can also reduce shearing force. The object of the present invention is to provide a spider for replacing the die of a molding machine.

Structure of the Invention In order to achieve the above-mentioned object, the present invention has a movable plate that is moved in a direction intersecting the inner supply passage and the outer supply passage. A spider body is provided which is detachably attached to the mouthpiece, and an inner material passageway communicating with the mold hole of the mouthpiece and the inner supply passageway is formed through the spider body, and an outer material passageway is formed through the spider body, which communicates with the mold hole of the mouthpiece and the inner supply passageway. A large number of outer material passages are formed through the peripheral edge portion to communicate with the die hole of the die and the outer supply passage.

Example Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The outline of the nozzle exchange device for the double extrusion molding machine using the snow molding machine of the present invention will be explained with reference to Fig. 2.3.
indicates the head part, and the nozzle 2 of one extruder supplies the inner material of the above-mentioned molded product A, for example, the material of the sponge molded part al, and the outer material of the molded product A, for example, the material of the solid rubber molded part a2. It consists of a mounting part 3 that connects to a nozzle of the other extruder (not shown) that is supplied, and a fixed plate 5 that is fixed to the tip of the mounting part 3 and has a rectangular insertion hole 4 of a movable plate 12, which will be described later. In this head part 1, an inner supply passage 6 communicating with the one nozzle 2 is formed from the rear end of the mounting part 3 to the insertion hole 4 of the fixing plate 5, and the other nozzle protrudes from the side surface of the mounting part 3. An outer supply passage 8 is formed extending from the outside of the front part of the inner supply passage 6 to the insertion hole 4 of the fixing plate 5 and communicating through the provided 7272 portion 7. The hole wall of the insertion hole 4 of the fixed plate 5, which is opened so as to separate the inner supply passage 6 and the outer supply passage 8, is provided with a fixed side spider 1 which will be described later.
1 slightly protrudes from the hole wall surface of the insertion hole 4 and is fitted with a screw.

Reference numeral 12 denotes a movable plate, which is attached to the fixed plate 5 through the insertion hole 4 so as to be movable in a direction intersecting the inner supply passage 6 and the outer supply passage B, and has a plurality of mouthpieces 13. .

These cap portions 13 have an accommodation hole 14 opened from the rear surface of the movable plate 12 in a bottomed shape in front of the front surface thereof, and a molding formed through the accommodation hole 14 with a smaller diameter than the accommodation hole 14 from the bottom surface of the accommodation hole 14 to the front surface of the movable plate 12. A movable side spider 1, which will be described later, abuts and supports the product passage 15 and the cap 16 housed in the housing hole 14.
It consists of 7. Mold holes having different cross-sectional shapes for the die are formed, and a movable spider 17 is provided on the side surface of each die hole.
A communication path 21 communicating with the outer material path 62 is formed.

n indicates a movable plate driving means, specifically a hydraulically driven cylinder, and is mounted on the side of the fixed plate 5 in the moving direction of the movable plate 12, for example, on the upper surface of the fixed plate 5 in the figure, across the movable plate 12. A hydraulic power source W27 is fixed to the top of the plate and is connected to the upper boat and the lower boat of the cylinder n via a control valve 26 which is controlled by a controller δ. The piston path of the cylinder n passes through the mounting plate 12 and is not fixed firmly to the upper surface of the movable plate 12, but is fixed so that it can be moved with a small amount of play.

Reference numeral 29 denotes a holding member, which is screw-fitted to the front part of the movable plate L2 of the fixed plate 5 so as to press the outer peripheral edge of the molded product passage 15 of the movable plate 12. It forms a gap between large diameter molded product passages.

Reference numeral 31 denotes a presser member driving means, specifically a hydraulically driven cylinder, which is rotatably attached via a pin to a support portion 32 protruding from the upper side of the fixed plate 5. The piston 36 of the 0 cylinder 31, which is connected to the hydraulic power source through a control valve switched and controlled by the controller 5, is connected to the upper boat and the lower boat of 31, and is protruded from the front surface of the flange of the presser member 4. It is rotatably connected to the mounting portion 37 via a pin 38.

The specific structure of the above-mentioned fixed side spider 11 and movable side spider 17 will be explained with reference to FIGS. 4 to 6. In other words, the fixed side spider 11 has an inner material passage 41 that communicates with the inner supply passage 6 formed through the axial center of the main body 40 whose front end surface is formed on the same plane, and the outer peripheral edge of the inner material passage 41. A large number of small diameter outer material passages 42 communicating with the outer supply passage 8 are formed therethrough. The main body 4
0 has a threaded portion 4 on the outer peripheral surface thereof for attachment to the fixing plate 5.
3 is formed.

The movable side spider 17 has an inner material passage 51 that matches the inner material passage 41 of the fixed side spider 11 penetratingly formed in the axial center between the main bodies whose rear end surfaces are formed on the same plane. A large number of small-diameter outer material passages 52 that match the outer material passages 42 of the fixed side spider 11 are formed through the outer peripheral edge.

The front end surface between the main bodies located between the inner and outer material passages 51 and 52 is connected to the base 1 disposed in the accommodation hole 14.
6 is brought into contact with the peripheral edge of the rear surface of 6. The front end portion between the main bodies located outside the outer material passage 52 extends to the front side of the mouthpiece 16 and covers the front outer peripheral surface of the mouthpiece 16, and in this portion, the outer material passage 52 is located outside the mouthpiece 16. It is communicated with the mold hole via a communication path 21.

In addition, a flange in which a grooved groove for a mounting jig (not shown) is formed protrudes from the rear outer FIRWI between the main bodies, and a movable plate 12 is provided on the outer circumferential surface between the main bodies located on the front side of this flange 8. According to the structure of the above embodiment, when replacing the lower nozzle part 13 shown in FIG. After stopping the feeding operation of the molten material from the other nozzle and slightly relaxing the pressure of the molten material in the nozzle, the control valve is operated by the control signal button from the controller section to raise the piston of the cylinder 31. The presser member 4 is moved in the reverse direction in the direction of the arrow X shown in FIG.

Thereafter, the control valve is operated in response to a control signal from the controller 25 to move the piston of the cylinder n downward, thereby moving the movable plate 1
2 in the direction of arrow Y. In addition to this, the lower base part 1
3 has inner material passages 41 , 51 and outer material passages 42 , 3 between the movable side spider 17 and fixed side spider 11 .
The movable side spider 1 of the upper base part 13 is disposed by shearing the molten material in the upper part 52 and protrudes below the fixed plate 5.
7 aligns the inner material passages 41 and 51 with the outer material passages 42 and 52 on the fixed side spider 11, and stops the downward movement of the piston row by a control signal from the controller 5. Subsequently, the piston A of the cylinder 31 is moved down to rotate the presser member 4 forward in the direction of arrow
Extrude the binder 17 from between the mating surfaces of the fixed side spider 11
The movable plate 12 is locked by the pressing member 4 in close contact with the piston of the cylinder 31, and the driving of the piston of the cylinder 31 is stopped. After this cylinder 31 and the cylinder n are stopped, the pressure oil of the upper boat and the lower boat of each cylinder 31 and 22 is locked by the valve body of each control valve A and 26 according to a control signal from the controller 6. Then, by operating the extruder to supply the molten material, compression molding of a new cross-sectional shape can be performed.

Now, the fixed side spider 11 and the movable side spider 17 are in close contact because the joining surfaces of both the spiders 11 and 17 and the front and rear end surfaces of the tabs are formed on the same plane, so that the presser member 4 can be pressed. Pressure makes it easy and reliable. Furthermore, when the movable spider 17 is fitted with the screw to the movable plate [2], when the front end surface of the main body gloss of the movable spider 17 is brought into close contact with the rear peripheral edge of the base 16, the movable spider 17 is trapped. Since the front end between the main bodies covers the front outer peripheral surface of the mouthpiece 16, the inner supply passage 6. The inner material passing through the inner material passages 41 and 51 and the outer material supply passage 8. Outer material passage 42
, 52, and the material on the multiplication side enters the mold hole 2 of the base 16.
It is not mixed until OK is reached and extruded.

Therefore, when the molded product is extruded from the die hole of the die 16 into the molded product passage 15, six parts a of the inner material are extruded as shown in FIG.
It is possible to obtain a double extrusion molded product A consisting of a shell a2 covered with an outer material on the outside.

Moreover, by forming a large number of outer material passages 52 of the movable side spider 17, the movable plate [2
When the molten material is sheared by the movement of the molten material, the shearing force can be reduced because the cross-sectional area of the molten material at the sheared portion is small. Further, since the outer material passages 52 are arranged in multiple equal parts in the circumferential direction, it is possible to supply the molten material from the head portion 1 to the die hole forming of the die 16 while maintaining a constant flow state of the molten material. When carrying out single molding using both the spiders 11 and 17, the operation of supplying the molten material of the other extrusion molding machine (not shown) connected to the flange portion 7 of the head 1 is stopped, or the L This can be done by removing the other extruder from the 7279 section 7. In this case, a cap without the communication path 21 may be used in place of the cap 16.

Effects of the Invention As described above, according to the present invention, even when the cap is replaced by moving the cap in a direction that intersects both the inner and outer material passages, the seal at the joint between the two material passages and the cap is maintained. In addition, the cross-sectional area of the molten material at the time of changing the cap can be reduced, and the shearing force can be reduced. Therefore, it is possible to achieve double extrusion molding with good moldability, shorten the work of replacing the die, and reduce the driving force of the movable plate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a double extrusion molded product, FIG. 2 is a schematic diagram showing a main part of a die changing device of a double extrusion molding machine using the spider of the present invention, and FIG. The figures are a cross-sectional view taken along line I-IIfiJ in Figure 2, a cross-sectional view similar to Figure 3N showing an enlarged view of essential parts of an embodiment of the present invention, and Figure 5.
The figure is a cross-sectional view taken along the line ■--v in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line ■--■ in FIG. 4. DESCRIPTION OF SYMBOLS 1... Head part, 5... Fixed plate, 6... Inner supply passage, 8... Outer supply passage, 11... Movable side spider, [2... Movable plate, 13... Base part, 17...
Fixed side Spiter, 40.50...Main body, 41, 5
1...Inner material passage 1.42, 52...Nine cable material passages. 2 others Fig. 1 1g Fig. 2 Fig. 3 Fig. 41λI I7 No. 5131 I Fig. 6

Claims (1)

[Claims] A spider for replacing the mouthpiece of a double extrusion molding machine, in which a movable plate having a mouthpiece is attached to the head part of the double extrusion molding machine having an inner supply passage and an outer supply passage so as to be movable in a direction intersecting the material passage. A spider body is provided which is detachably attached to the mouthpiece of the movable plate and whose tip abuts the rear surface of the mouthpiece disposed in the mouthpiece, and the spider body is provided with a mold hole of the mouthpiece and the inner supply passage. A plurality of outer material passages communicating with the die hole of the die and the outer supply passage are formed on an outer peripheral edge of the inner material passage. Sunokuida for replacing the mouthpiece of a double extrusion molding machine.