JPH043783Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a head of a multilayer coextrusion device.

[Conventional technology and its problems]

In general, the so-called tread, which is the part that comes into direct contact with the general surface of an automobile tire, is made up of several types of rubber layers with different properties.As shown in FIG.
0', a back layer 41', and a pair of side layer surfaces 42' in many cases.

By the way, as one method for making an extruded product having a three-layer structure as described above, the surface layer 4 is
There is a method of making a two-layer extrusion molded product consisting of a back layer 41' and a back layer 41', and adhering a side layer 42' formed by a separate extrusion device to the side surface of the molded product.
The drawback is that it takes a lot of time to manufacture.

There is also a method of molding using a three-layer extruder, but the conventional three-layer extruder is very large and often causes unreasonable bending to the extruded product.
There are disadvantages such as the time required to clean the passages and extruder.

In order to eliminate this drawback, the present applicant divided the head of the extrusion device into four parts in the vertical direction, a fixed divided head, two first movable divided heads that overlap above and below the fixed divided head, and a second movable divided head that overlaps with the first movable divided head. A movable split head is provided, an extrusion passage communicating with a die fitting hole provided in the front end face of the head is formed between the abutting surfaces of each split head, and the two first movable split heads are opened and closed relative to the fixed split head. A head for a multilayer extrusion apparatus has already been proposed in which the second movable divided head can be opened and closed with respect to the overlapping first movable divided head (Japanese Patent Application No. 59-141001).

In the above head, the two first movable split heads are open to the fixed split head, and the second movable split head is opened.
By opening the movable split head to the first movable split head that overlaps it, each extrusion passage can be opened, so the extrusion passage can be easily cleaned, and the opened extrusion passage can be cleaned easily. Since the screw of the extruder can be pulled out from the extruder, the extruder can be easily cleaned.

[The problem that the idea aims to solve]

However, in the above head, the second movable split head overlaps the first movable split head.
A plate is formed between the extruder connecting plate provided on the back surface of the movable split head and the fixed split head, and a communication hole is provided in the plate that communicates with the extrusion passage between the second movable split head and the second movable split head. is provided, and when the mold of each split head is clamped, both the front and rear surfaces of the plate body are brought into close contact with the back surface of the second movable split head and the front surface of the connecting plate, and an extrusion passage is formed from the inlet passage provided in the connecting plate through the communicating hole. Since the structure prevents leakage of the rubber-like substance sent to the head, it is necessary to process the abutting surfaces of the plate, the second movable split head, and the connecting plate with extremely high precision. For this reason, there is a problem in that it takes a lot of time and effort to process.

The technical objective of this invention is to solve the above-mentioned problems and facilitate processing of both the front and back surfaces of a plate having communicating holes.

[Means to solve the problem]

In order to solve the above problems, in this invention, the head main body having a die fitting hole on the distal end surface is divided into a fixed split head, a first movable split head overlapping the fixed split head, and a first movable split head. and a second movable splitting head overlapping with the splitting head, an extrusion passage communicating with the die fitting hole is provided between the abutting surfaces of each splitting head, and the fixed splitting head is provided with an extruder extending to the back side of each movable splitting head. A connecting plate is provided, and the first movable dividing head is provided with a plate interposed between the back surface of the second movable dividing head and the extruder connecting plate, and the plate is provided with a connecting plate between the first movable dividing head and the second movable dividing head. A communication hole communicating with the extrusion passage is formed in the extruder communication plate, an inlet passage communicating with the communication hole and the remaining extrusion passage is provided in the extruder communication plate, and an arm provided at the tip of the plate is connected to the end of the connection plate. The second movable split head is rotatably connected to the provided bracket, and the second movable split head is connected to the first
In the head of the first layer extrusion device, which is connected to the movable split head so as to be openable and closable, and each movable split head is rotated by a drive device, the inner diameter of the tip opening communicating with the extrusion passage of the communication hole. is made larger than the inner diameter of the rear end opening of the extrusion passage, and the connecting plate has a protrusion that is inserted into the communication hole and whose tips abut against the back surfaces of the first movable split head and the second movable head. A configuration is adopted in which the inlet passage is opened at the distal end surface of the protrusion.

[Effect]

When the first movable split head and the second movable split head are closed, the tip surfaces of the protrusions come into close contact with the back surfaces of the first movable split head and the second movable split head, and due to this close contact, the extrusion is pushed out from the inlet passage to the extrusion passage. prevent leakage of rubber-like substances.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in FIGS. 1 to 3, the head body 1
A die fitting hole 2 is formed in the distal end surface of the die fitting hole 2, and a pair of die fixing cylinders 3 are arranged in the vertical direction sandwiching the die fitting hole 2, and a presser foot with one side inclined on one side is attached to the piston rod 4 of each cylinder 3. Plate 5 is connected. Each of the holding plates 5 can be slid along a guide hole 6 provided on the front surface of the head body 1, and when the cylinder 3 is actuated to move the pair of holding plates 5 toward each other, each holding plate 5 can be slid. The tip of the presser plate 5 faces above and below the die fitting hole 2, and the die fitting hole 2
The die 7 fitted therein is prevented from coming off.

The head main body 1 is divided into four parts in the vertical direction,
Each dividing surface 9 is inclined toward the die fitting hole 2, and an extrusion passage 10 reaching the die fitting hole 2 is provided between each dividing surface 9.

The head body 1 is a fixed split head 11c.
, first movable split heads 11b and 11d stacked above and below the fixed split head 11c, and a second movable split head 11a stacked on top of the upper first movable split head 11b, each head 11a,
An extrusion passage 10 communicating with the die fitting hole 2 is provided between the abutting surfaces of 11b, 11c, and 11d.

An extruder connecting plate 12 extending to the backs of the movable dividing heads 11a, 11b, and 11d is provided on the back of the fixed dividing head 11c, and three extruder mounting surfaces 13 are formed in the vertical direction on the back surface of the connecting plate 12. ing.

On the other hand, a plate 40 that fits between the connecting plate 12 and the second movable split head 11a is formed on the back of the first movable split head 11b that overlaps the upper side of the fixed split head 11c. A communication hole 41 communicating with the extrusion passage 10 formed by the movable split head 11b and the second movable split head 11a.
is provided. The communication hole 41 is a tapered hole whose diameter becomes smaller toward the extrusion passage 10, and the inner diameter of the opening at its tip is larger than the inside diameter of the opening at the rear end of the extrusion passage 10.

The connecting plate 12 is formed with a conical protrusion 42 which is inserted into the communication hole 41 and has a distal end surface abutting against the back surfaces of the first movable split head 11b and the second movable split head 11a. Further, the connecting plate 12 is provided with an inlet 14 that opens at the distal end surface of the protrusion 42 and communicates with each of the extrusion passages 10 . In the case of the embodiment, a hole is formed in the communication plate 12, and a cylinder 43 is inserted into the hole, so that the inside of the cylinder 43 serves as the inlet passage 14.

Furthermore, a bracket 15 is formed on the upper and lower parts of the connecting plate 12, and the upper bracket 15, the second movable split head 11a, and the first
Arms 16 provided on the back of each movable split head 11b are movably connected by a shaft 17. On the other hand, an arm 16' provided on the back of the lower bracket 15 and the first lower movable split head 11d is rotatably connected by a shaft 17', and a cylinder for rotation of each of these movable split heads 11a, 11b, 11d. 18, 19, 20 piston rod 2
1 is connected to a protrusion 22 provided on each arm 16, 16', and by operating the cylinders 18, 19, 20, the movable split heads 11a, 11b,
11d can be rotated.

Each of the movable split heads 11a, 11b, 11d is held closed by the action of a head tightening mechanism 30. Here, head tightening mechanism 3
0 is a fixed dividing head 11 as shown in FIG.
Support locks 31 are provided on both sides of the second movable split head 11a and the lower first movable split head 11d, with the upper and lower surfaces tilted in opposite directions so that the width of the front end is larger than that of the rear end. The surface is provided with a tightening block 34 having an inclined surface 33 which is supported on the inclined surface 32 of the support block 31 in the closed state, and the upper surface of the upper tightening block 34 and the lower surface of the lower tightening block 34 are connected to this. It has an inclined surface 35 that is inclined in the opposite direction to the inclined surface 33 on the back side, and is attached to the side surface of the extruder connecting plate 12, and the head main body 1 is formed around the connecting shaft 36.
The clasp 37, which is rotatably supported toward the side surface of the clasp 37, is formed with a recess 38 into which the pair of tightening blocks 34, 34 can be fitted, and the upper and lower surfaces of the recess 38 are fitted with the tightening blocks 34, 34. 34, and its clasp 37 is fitted to the outside of the pair of tightening blocks 34, 34 to hold each of the splittable heads 11a, 11b, 11d in an assembled state. It is designed to do so.

Note that a cylinder can be used as a drive device for rotating the clasp 37.

The head shown in the embodiment has the above-mentioned structure, and as shown in FIG. form. In this case, the tip of the screw 51 of the extruder 50 is inserted into the inlet passage 14.

Now, the movable split heads 11a, 11b, 11d
When each extruder 5 is closed, each extruder 5
When the rubber-like material is extruded from the 0, the rubber-like material flows through the extrusion passage 10 and is injected from the common die 7. In the extruded state, the protrusion 42
The distal end surface of the first movable split head 11b and the second
Since it is in close contact with the back surface of the movable split head 11a, the rubber-like substance will not leak along both the front and back surfaces of the plate 40.

Here, if the arrangement of the outlets A, B, and C of the three extrusion passages 10 communicating with the outlet 7' of the die 7 is as shown in FIG. 6, an extruded product as shown in FIG. Obtainable. Note that the outlet A is an extrusion passage 1 provided in the center of the head body 1.
0, exit RO indicates the outlet of the extrusion passage 10 provided at the lower part of the head body 1, and exit C indicates the outlet of the extrusion passage 10 provided at the upper part of the head body 1.

When disassembling and cleaning after molding the extrudate as described above, after rotating the clasp 37 to release the coupling between the movable split heads 11a, 11b, 11d, the movable split heads 11a, 11b, 11d
Open each of them.

Now, when the driving cylinder 18 of the second movable split head 11a is actuated to move its piston rod 21 backward, the second movable split head 11a moves back to the shaft 1.
7, the second movable split head 11a can be opened, as shown by the dashed line in FIG. For this reason, the second movable split head 11a and the first movable split head 11 below it
The extrusion passage 10 formed between the upper extruder 50 and the upper extruder 50 is divided into two parts along the axis, and the extrusion passage 10 can be easily cleaned. It can be pulled forward from the opening.

Furthermore, when the driving cylinders 19 and 20 of the first movable split heads 11b and 11d are actuated to move the piston rod 21 backward, the first movable split heads 11b and 11d rotate about the shafts 17 and 17', respectively. The extrusion passage 10 formed by the fixed dividing head 11c can be easily cleaned, and the screws of the central extruder 50 and the lower extruder 50 can be pulled out in front of the head body. I can do it.

In the embodiment shown in FIG. 1, the rotation centers of the first movable split head 11b and the second movable split head 11a are arranged on the same axis, but as shown in FIG. Arm 1 of 11b
The second movable split head 11 is attached to the protrusion 22 extending from the second movable split head 11.
The arm 16 of a may be rotatably connected.

Further, a first movable split head is disposed above the fixed split head 11c, and a first movable split head is arranged above the fixed split head 11c.
First and second movable dividing heads may be provided below the fixed dividing head, and first and second movable dividing heads may be provided above and below, respectively, sandwiching the fixed dividing head, so that an extrudate having a four-layer structure can be obtained. You can.

〔effect〕

As described above, according to the head according to this invention, the inner diameter of the opening at the tip of the communication hole formed in the plate body is larger than the inner diameter of the opening at the rear end of the extrusion passage between the first movable split head and the second movable split head. However, since the extruder connecting plate is provided with a protrusion that is inserted into the communication hole and whose tip end surface is in close contact with the back surface of the first movable dividing head and the second movable dividing head, the opposing surfaces of the plate body and the connecting plate and Even if there is a gap between the opposing surfaces of the plate and the second movable split head, the rubber-like substance extruded into the extrusion passage does not leak, and processing of each opposing surface is extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the head according to the invention, FIG. 2 is a front view of the same, FIG. 3 is a side view of the same, and FIG. 4 is an open state of the movable split head of the same. 5 is a plan view showing the connecting portion of the movable dividing head, and FIG. 6 is a front view showing the arrangement of the exit of the die and the exit of each extrusion passage.
FIG. 7 is a cross-sectional view of the extruded product, and FIG. 8 is a cross-sectional view showing another embodiment of the same extruder. 1...Head body, 2...Die fitting hole, 10...
...Extrusion passage, 11a...Second movable dividing head,
11b...First movable dividing head, 11c...Fixed dividing head, 12...Extruder connecting plate, 14...Inlet passage, 15...Bracket, 16...Arm,
41...Communication hole, 42...Protrusion.

Claims (1)

[Scope of utility model registration request] The head body 1 having the die fitting hole 2 on the tip surface is fixed to a split head 11c, and the fixed split head 1 is fixed to the split head 11c.
1c, and a second movable split head 11a that overlaps with the first movable split head 11a, each split head 11a, 11b
An extrusion passage 10 that communicates with the die fitting hole 2 is provided between the abutting surfaces of the extruder, and the fixed dividing head 11c is provided with an extruder coupler 12 that extends to the back side of each of the movable dividing heads 11a and 11b. Split head 11
b is provided with a plate body 40 interposed between the back surface of the second movable divided head 11a and the extrusion connecting plate 12, and the extrusion passage 10 between the first movable divided head 11b and the second movable divided head 11a is provided in the plate body 40. The extruder connecting plate 12 is provided with an inlet passage 14 that communicates with the connecting hole 41 and the remaining extrusion passage 10, and the arm 16 provided at the tip of the plate 40 is connected to the connecting plate. The second movable divided head 11a is rotatably connected to a bracket 15 provided at the end of the head 12, and the second movable divided head 11a is connected to the first movable divided head 11b so as to be freely openable and closable, and each movable divided head is movable by a drive device. In the head of the multilayer extrusion device, the extrusion passage 10 of the communication hole 41 is
The inner diameter of the opening at the tip communicating with the extrusion passage 10 is made larger than the inner diameter of the opening at the rear end of the extrusion passage 10. A protrusion 42 that abuts on the back surface is formed, and the protrusion 42
1. A head of a multilayer extrusion device, characterized in that an inlet passage 14 is opened at a distal end surface of the head.