JPH0455578B2 - - Google Patents

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is characterized in that a plurality of independent extrusion channels in one cylinder are concentrated in one head,
This invention relates to a multicolor extruder that extrudes a multicolor extrudate.

The multicolor extruder of this invention is suitable for molding multilayer rubber hoses, weather strips whose base and seal parts are made of different materials, multilayer sheets and other multilayer rubber products, multilayer resin products, and multilayer rubber-resin products. It is something.

<Prior Art> FIG. 5 is a plan view showing a conventional multicolor extruder 1 used for manufacturing a multilayer rubber hose. In this multicolor extruder 1, the first extruder 3, which is in charge of forming the first layer (counting from the inner tube side; the same applies hereinafter) in a multilayer rubber hose, is connected to the extension axis of the head 25 (mandrel 2
6) to the side of the cylinder 5
placed at a 45° angle. In addition, the second extruder 13, which is in charge of forming the second layer, moves its cylinder 15 to the side opposite to the extension axis of the head 25.
placed at a 60° angle.

The first extruder 3 includes a cylinder 5, a feed roller 7, and a reducer 9 arranged coaxially, and a motor 11.
is arranged in parallel with this and connected by a reduction gear 9 and a drive belt 12.

The second extruder 13 has a configuration in which a cylinder 15, a feed roller 17, and a power transmission part 19 are arranged coaxially, and a motor 21 and a speed reducer 23 are arranged. The speed reducer 23 and the power transmission section 19 are connected by a drive belt 24.

Each cylinder 5, 15 is connected to a head 25 (see Fig. 6), and the material extruded by each extrusion screw 6, 16 in the cylinder 5, 15 is transferred from the extrusion channel 4, 14 to the material input path of the head 25, respectively. 27 and 29.

The material input path 27 communicates with an annular flow path 31 formed by a center mandrel 35 and an inner pipe die 37,
The material input path 29 has an inner tube die 37, a die holder 39,
It communicates with the annular flow path 33 formed by the outer tube die 41.

The center mandrel 35 has a through hole formed along its axis through which the core mandrel 26 is inserted, and is connected to an annular support member 35b by a spider. The annular support member 35b is attached to the head body 43 with a position adjustment bolt (not shown) or the like.

The inner tube die 37 is arranged concentrically with the center mandrel 35 and with a predetermined gap (annular flow path 31), and the annular support member 37b supports the center mandrel 35 in an annular manner with a position adjusting bolt (not shown) or the like. It is attached to member 35b.

The outer tube die 41 is attached to the die holder 39 with a die presser 44.
Installed to.

In the first extruder 3, the first layer forming material (for example, nitrile rubber; NBR) extruded by the extrusion screw 6 is transferred from the extrusion channel 4 to the material input channel 27 to
It is extruded from the orifice 45 through the annular flow path 31 and forms the first layer b on the circumferential surface of the iron core mandrel 26.

At the same time, the second layer forming material (for example, Hypalon; CSM) extruded by the extrusion screw 16 of the second extruder 13 passes through the extrusion flow path 14 → material input path 29 → annular flow path 33 to the orifice 4.
7 to form the second layer c.

Therefore, a two-layer rubber hose is extruded from one extrusion opening K of the head 25 as one extrusion body.

<Problems to be Solved by the Invention> The conventional multicolor extruder 1 having the above configuration had the following problems.

() With respect to the extended axis of the head 25, the cylinders 5 and 15 of each extruder 3 and 13 are arranged at 45 degrees, respectively.
They are in a 60° intersecting position. Therefore, since the flow direction of each rubber material extruded by each extrusion screw 6, 16 and flowing into the head 25 changes at a portion extending from the material input paths 27, 29 to the annular flow paths 31, 33, each rubber material It is difficult to make the flow uniform. This may appear as uneven thickness in the product.

Of course, if the distance between the material entry paths 27 and 29 is long, the intersection angle between the imaginary extension axis of the head 25 and the material entry paths 27 and 29 can be made smaller, so that the above problem can be solved. can. However, depending on the material, the material entry path 27,
If the length 29 is made too long, scorch may occur or material flow may be significantly inhibited, so such a measure cannot be adopted.

() Generally, the cylinder of an extruder has the property that its tip "wobbles" in one direction as the extrusion screw inside rotates. Here,
In the multicolor extruder 1 in FIG. 5, each extruder 3, 13
The cylinders 5 and 15 are arranged so as to intersect with each other, and the tips of each cylinder 5 and 15 are fixed to one head 25. In this case, the above-mentioned "runout" of each cylinder 5, 15 becomes a problem. In other words, the forces that cause "runout" in each cylinder 5, 15 interfere,
Connection part between cylinders 5, 15 and head 25, or cylinders 5, 1 where mechanical strength is relatively difficult to obtain.
Failures are more likely to occur in the 5th class. Therefore, it is necessary to increase the connection strength and mechanical strength of the cylinders 5, 15 and the head 25, but this inevitably increases the weight of the device due to thicker materials, and also increases the cost due to higher quality materials. This will cause problems such as oxidation.

<Means for Solving the Problems> The present invention is a multicolor extruder made to solve the problems.

The structure of the multicolor extruder includes a plurality of independent extrusion channels inside, and the plurality of independent extrusion channels are combined to extrude one multicolor extrudate. a head having an independent extrusion channel and an extrusion opening that converges at the front end of the extrusion channel to extrude a single multicolor extrudate, and is connected to the rear of the head. one cylinder, the one cylinder is in communication with each of a plurality of independent extrusion channels inside the head in a one-to-one correspondence, and is an imaginary extension of the head. It has a plurality of independent extrusion channels formed approximately along the axis, and a plurality of extrusion screws arranged in correspondence with each of the independent extrusion channels. It is characterized by

<Actions and Effects> The multicolor extruder of the present invention having such a configuration has the following effects.

() Since a plurality of independent extrusion channels within one cylinder are formed along the imaginary extension axis of the head, the material extruded by each extrusion screw is subject to large current changes. Instead, it flows smoothly into the head. Therefore, the material flow becomes uniform, and uneven thickness phenomena are less likely to occur in the product.

() Since the configuration is such that one cylinder is connected to the head, the so-called "runout" of the cylinder
This eliminates the need for cylinders and heads to be thick-walled or made of high-quality materials.
This is because the "bending" can be left to the cylinder's discretion.

Also, for example, two independent cylinders within one cylinder.
When inserting two extrusion screws into each of the extrusion channels of a book, if the rotation direction of each extrusion screw is reversed, the "runout" of the cylinder will be reduced.
This cancels out the forces that cause this, making it possible to prevent the cylinder from wobbling.

() When the melting temperatures of the materials extruded by each extrusion screw are approximately equal, in the multicolor extruder of the present invention in which the cylinder is shared by a plurality of independent extrusion channels, the cylinder temperature control means Since it is possible to reduce the number of units to one, there is an effect that the thermal efficiency is improved and the device cost can also be reduced.

() Conventionally, the cylinder has a long length and has had problems with mechanical strength, but in the present invention, it is made into one cylinder, and has a plurality of independent extrusion channels inside, and each extrusion channel has a separate extrusion channel. This has the effect of increasing the diameter due to the necessity of inserting the screw, resulting in improved mechanical strength.

<Example> Hereinafter, an example of the present invention will be described using a manufacturing apparatus capable of simultaneously and continuously forming a reinforced rubber hose consisting of two inner tube layers, a reinforcing layer, and one outer tube layer (hereinafter referred to as "manufacturing of reinforced hose"). The explanation will be given by taking as an example the inner tube extruder 51 used in the apparatus 50.

FIG. 1 is a partially sectional plan view of the inner tube extruder 51 of the embodiment, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is a side view of the reinforced hose manufacturing apparatus 50, and FIG. 4 is an enlarged sectional view of the head.

This reinforced hose manufacturing device 50 includes an inner tube extruder 51, an outer tube extruder 130, and a spiral device 150.
It is equipped with

The inner tube extruder 51 is a first extruder 5 used for forming the first layer of the inner tube of the rubber hose, as shown in FIG.
3 and a second extruder 6 used to form the second layer.
3. And each extruder 53, 63
The extrusion screws 55 and 65 are formed independently along the imaginary extension axis of the head 120 in one cylinder 90.
105, 97-107, and this one cylinder 90 is connected to one head 120 so that each independent extrusion channel 10 within the cylinder 90
5 and 107 communicate with each independent material inlet passage 113 and 115 of the head 120. In the inner tube extruder 51, the imaginary extension axis of the head 120 is equal to the extension line connecting the center mandrel 123 and the torpedo 129.

The extruders 53 and 63 have the same configuration, although they differ in size depending on their processing capacity. Therefore, the second extruder 63 will be explained below with reference to FIG.

A bearing portion 67 is fixed to the base of the extrusion screw 65, and a transmission portion 69 is provided behind the bearing portion 67 (on the right side in the figure). The transmission part 69 is formed by meshing a first gear 73, a second gear 75, and a third gear 77 in a direction away from the first extruder 53. code 7
0 is its casing. One first gear 73 constituting the transmission section 69 is fitted onto a drive shaft 71 fixed behind the bearing section 67 with the same axis as the extrusion screw 65, and the rotation of the first gear 73 is controlled by the extrusion screw 65. It is transmitted to.

Incidentally, a rotary joint 72 through which screw cooling water enters and exits is provided at the end of the drive shaft 71.

One third gear 77 constituting the transmission section 69 is fixed on the shaft of a large-diameter gear 81 of the reduction gear 79. Further, the second gear 75 meshes with the first and third gears 73 and 77. These three gears 73,7
The gear ratios of 5 and 77 are the same. Therefore, the first gear 73 rotates in synchronization with the large diameter gear 81 of the reduction gear 79, thereby rotating the extrusion screw 65.

The large-diameter gear 81 of the reducer 79 meshes with a small-diameter gear that does not appear in the figure (see the positional relationship between the large-diameter gear 81a and the small-diameter gear 83a of the first layer extruder 53 shown in FIG. 3), and this small-diameter gear 83a is connected to the motor. 85.

Further, a feed roller driving gear 86 is fixed to the front (left side in the figure) of the bearing portion 67 of the extrusion screw 65 so as to fit into the base of the extrusion screw 65, and is engaged with the gear portion 89 of the feed roller 87. There is. Therefore, as the extrusion screw 65 rotates, the feeder 87 also rotates.

Note that this feed roller 87 is connected to the second extruder 6
The third medium 64 is disposed in the opposite direction to the first extruder 53.

As mentioned above, the first extruder 53 has the same structure as the second extruder 63, so parts that are the same as those making up the second extruder 63 are designated with the same number and the symbol "a". Although the configuration explanation is omitted, the mission department 69a
Both extruders 53 and 63 are provided with a head 120 so that the
The extrusion screws 55, 65 are arranged symmetrically with respect to the imaginary axis of extension of the extrusion screws 55, 65 so as to approach each other on the distal end side.

Therefore, as is clear from FIG. 1, no parts are present on the opposing surfaces of the two extruders 53, 63. Furthermore, by shifting the positions of the mission parts 69, 69a, the first extruder 53 and the second extruder 63 can be arranged as close as possible with their extrusion screws 55, 65 facing in the same direction. becomes possible.

Next, the cylinder 90 will be explained.

This one cylinder 90 consists of a cylinder base 91 and a cylinder head 93. Cylinder base 91
The cross section (see Figure 2) is shaped like a peanut, combining two large and small semicircles. And independent extrusion channels 95, 97 are provided at the center of each semicircle.
are bored, and these independent extrusion channels 95 and 97 are made to approach each other on the head 120 side. Extrusion screws 55 and 65 are inserted into each independent extrusion channel 95 and 97, respectively. Spiral grooves 99, 10 are provided on the peripheral walls of the extrusion channels 95, 97.
1 is drilled, and a hard liner 103 is further fitted, and the spiral grooves 99, 101 are used as flow paths for a heat medium (water, oil, etc.), thereby forming a preparation adjustment means.

In addition, if the molding materials of the first layer and the second layer are similar in thermal properties such as softening temperature, the thermal efficiency can be improved by integrating the spiral grooves without providing them separately and adjusting the temperature of the entire cylinder base 91. will improve. It also reduces equipment costs.

In addition, if the molding materials of the first layer and the second layer have different thermal properties, each independent extrusion channel 9
It is preferable to form a heat insulating layer (air layer, etc.) between the formed walls 5 and 97.

This one cylinder base 91 is connected to the extrusion screws 55, 65 of each extruder 53, 63 as described above.
The internal extrusion channels 95, 9 are arranged approximately parallel to each other.
7, its outer diameter is made as small as possible. For example, the diameter of the extrusion screw 55 is 7
cm, when the diameter of the extrusion screw 65 is 4 cm, the large diameter part L of the cylinder base 91 is 22 cm, and the small diameter part l is 14 cm.
cm (see Figure 2).

Therefore, such one cylinder base 91 can be used as a spiral device 150 used for general hose manufacturing.
The cylindrical support member 155 can be penetrated.

In addition, in general, in continuous hose manufacturing equipment, the spiral device and the outer tube extruder are installed at the tip of the cylinder of the inner tube extruder, so it is not possible to install a member to support the cylinder, so the mechanical strength of the cylinder is low. However, the inner tube extruder 51 of the embodiment has two independent extrusion channels 95 and 97 in one cylinder.
In order to insert the extrusion screws 55 and 65 into the cylinder, one cylinder becomes thick as a result.
It has the effect of improving its strength.

The cylinder head 93 is a cylindrical member, and is fixed to the cylinder base 91 by flanges 92 and 94 (by bolting or the like). This cylinder head 93 is also formed with independent extrusion channels 105 and 107 that communicate with the independent extrusion channels 95 and 97 of the cylinder base 91, and the liner 1
03 is fitted.

Extrusion screws 55, 6 of each extruder 53, 63
5 is inserted up to this cylinder head 93. The extrusion passages 105 and 107 are bent and reduced in diameter at the distal end portion of the cylinder head 93 so as to communicate with the material input passages 113 and 115 of the head 120, respectively.

Note that although this cylinder head 93 is not formed with a spiral groove, when it is necessary to strictly control the temperature of the molding material, for example, the cylinder head 93 is
A cooling jacket (not shown) is also formed inside.

Next, referring to FIG. 4, the head 120,
The outer tube extruder 130 and the spiral device 150 will be explained.

The head 120 includes a head body 121, a center mandrel 123, a first die 125, a second die 1
It is equipped with 27.

The head body 121 that is attached to the tip of the cylinder head 93 (by screwing or the like) is formed with material inlet passages 113 and 115 that communicate with the independent extrusion channels 105 and 107 of the cylinder head 93, respectively. , respectively, the center mandrel 123 and the first
the first annular channel 117 formed with the die 125;
and a second annular flow path 119 formed by the first die 125 and the second die 127.

The center mandrel 123 is the head body 121
, and is connected to the annular support member 123b by an unillustrated spider. Annular support member 1
23b is fixed to the head body 121 with a position adjustment bolt (not shown) or the like.

At the tip of this center mandrel 123,
A torpedo 129 having an outer diameter that determines the inner diameter of the hose E is bulged and extends slightly beyond an outer pipe die 139, which will be described later. In addition, in order to make the inner diameter of the hose E variable, the torpedo 129 and the center mandrel 123 may be made separate (fixed together by screwing, etc.), so that the torpedo 129 can be changed to one with a desired outer diameter. can.

The first die 125 has a center mandrel 123
concentrically with a predetermined gap (first annular flow path 117)
It is arranged with the following in mind. This first die 125 is connected to an annular support member 125b by an unillustrated spider, and the annular support member 125b is connected to the head main body 121.
It can be attached with a position adjustment bolt (not shown) or the like.

The second die 127 is also arranged concentrically with the center mandrel 123 and has a predetermined gap (second annular flow path 119) between it and the first die 125. Then, it is attached to the head main body 121 with a position adjustment bolt or the like.

Reference numeral 128 in the figure is a fixing nut, and K is one extrusion opening similar to the conventional one.

The head 131 of the outer tube extruder 130 is attached to a conventional extruder cylinder (not shown). This head 131 consists of a material introduction part 133 and a cylindrical part 135, and the cylindrical part 135 is provided with an intermediate die 137 and an outer tube die 139.
Then, the material outlet 141 is formed at a position close to the second die 127 and outside the outer periphery of the torpedo 129 by both of them. In addition, the intermediate die 137 and the outer tube die 139 are each attached to the die presser 1.
43,145.

The cylindrical portion 135, the intermediate die 137, and the outer tube die 139 form an annular flow path 147 for the outer tube molding material. This annular flow path 147 is connected to the material introduction section 1.
It communicates with the material inlet 149 of No. 33.

The spiral device 150 (see FIG. 3) is composed of an inner bobbin carrier 151 and an outer bobbin carrier 153, and each carrier 151, 153 is rotatably supported by a cylindrical support member 155. code 1
57 is an abutment. And each bobbin carrier 1
For example, 12 bobbins 159 from which reinforcing yarns F1 and F2 can be drawn out are arranged in 51 and 153.
Two drive arms 161, 163 are erected from each bobbin carrier 151, 153, and the shaft 16 is attached to the tip of each drive arm 161, 163.
5,167 and spinner arm 169,171
The inner spinner 173 and the outer spinner 1
75 is fixed. Each spinner 17
3,175 has a truncated cone shape, and the inner tube extruder 51
head 120 and head 13 of outer tube extruder 130
1 so as not to interfere with each other. At the tip of each spinner 173, 175, thread holes (not shown) are provided for passing the reinforcing threads F1, F2.
There are 12 of them, arranged at equal pitches.

Note that the reference numeral 177 in the figure is a bearing.

Next, how the continuous hose manufacturing device 50 is used will be explained.

In the inner tube extruder 51, the first layer molding material (for example, NBR) of the reinforced hose E is passed through an independent extrusion channel 9 by the extrusion screw 55 of the first extruder 53.
5-105 → Material input path 113 → First annular flow path 11
7→The first layer is extruded through the orifice formed by the first die 125 and the torpedo 129.
B ₁ is formed.

Immediately thereafter, the extrusion screw 65 of the second extruder 63 moves the second layer molding material (for example, CMS) of the reinforced hose E into the independent extrusion channel 97-
107→Material input path 115-Second annular flow path 119→
The first layer is extruded through an orifice formed by a second die 127 and a first die 125.
A second layer _B2 is formed around the outer periphery of _B1 .

The reinforcing yarns (for example, saturated polyester resin fibers) F1 and F2 derived from each bobbin 159 of the spiral device 150 are implanted into the inner tube B having a two-layer structure formed in this way, so that a reinforcing layer with a spiral structure is formed. C is formed.

Subsequently, almost simultaneously, the outer tube extrusion material (e.g. epichlorohydrin rubber) of the outer tube extruder 130 is
is extruded through the material inlet 149 → annular flow path 147 → material outlet 141, and the outer tube D is formed.

At this time, each independent extrusion channel 95-105, 97-107 within one cylinder 90 is aligned with the imaginary extension axis of the head 120, and furthermore,
Since they are formed so as to approach each other on the head 120 side, there are independent passages through which each forming material of the inner tube B flows. The material inlet path 115→the annular flow path 119 are each as close to a straight path as possible. Therefore, after the materials forming the inner tube B are extruded from the cylinder 90, they flow smoothly.

Further, the reinforcement layer formation and the outer tube formation are performed using the second die 11.
Since the extrusion is carried out on the torpedo 129 formed to protrude from the extrusion, the inner tube B is not crushed, and since the outer tube D is formed on the inner tube B immediately after extrusion, the inner tube B and the outer tube are Adhesion with D is also good.

Above, the present invention has been explained by taking as an example the type of inner tube extruder 51 with two screws, but of course, three or four independent extrusion channels are formed within one cylinder, and each extrusion It is also possible to use a three-shaft or four-shaft type in which screws are arranged in each flow path.

In addition, the multicolor extruder of this invention can be used as in the conventional example,
In the case of manufacturing a multilayer rubber hose using an iron core mandrel, it goes without saying that a through hole through which the iron core mandrel is inserted is formed on the imaginary extension axis of the head in the cylinder.

[Brief explanation of the drawing]

1 to 4 show examples of the present invention, FIG. 1 is a partially sectional plan view of a multicolor extruder (inner tube extruder 51) of the example, and FIG. 3 is a side view of a continuous hose manufacturing apparatus 50 using the multi-color extruder (inner tube extruder 51) of the embodiment, and FIG. 5 is a cross-sectional view of a conventional multi-color extruder 1. The plan view and FIG. 6 are also enlarged sectional views of the head portion. 51... Inner tube extruder (multicolor extruder), 53...
First extruder, 55... Extrusion screw, 63...
Second extruder, 65... Extrusion screw, 90...
Cylinder, 95, 105... Extrusion channel, 97, 1
07...Extrusion channel.

Claims (1)

[Scope of Claims] 1. A multicolor extruder having a configuration in which a plurality of independent extrusion channels are provided inside, and the plurality of independent extrusion channels are assembled to extrude one multicolor extrudate, a head having a plurality of independent extrusion channels and an extrusion opening that converges at the front end of the extrusion channel to extrude one multicolor extrudate; one cylinder, the one cylinder having a one-to-one connection with each of the plurality of independent extrusion channels inside the head.
a plurality of independent extrusion channels that communicate with each other and are formed substantially along the imaginary extension axis of the head, and one extrusion channel that corresponds to each of the independent extrusion channels;
A multicolor extruder characterized in that it is formed with a plurality of extrusion screws arranged one by one.