JP3957599B2 - Rubber coated cord extrusion apparatus and extrusion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a cord supply unit for supplying a plurality of cords, a rubber supply unit for supplying a rubber material to be coated on the cords, and a base unit for extruding the plurality of rubber-coated cords in a row. And a rubber-coated cord extrusion method using the device.
[0002]
[Prior art]
Fiber cords (reinforcing cords) may be used for reinforcement in rubber products or rubber layers formed on products. For example, there are a specific rubber layer in a tire, a rubber layer formed on the outer peripheral surface of a flexible tube, a rubber hose, a joint, and the like. In order to manufacture such products and rubber layers, first, fibers as reinforcing cords are formed in a string, and several tens to several hundreds of these are arranged in parallel, and these are joined with a weft thread having a low pitch and a low strength. Then, in a state in which the fiber arrangement is prevented from being disturbed, for example, a rubber is rubbed with a calendar machine to obtain an unvulcanized rubber-coated suda record.
[0003]
[Problems to be solved by the invention]
However, in order to obtain the Suda record as described above, it is necessary to process a large amount of material continuously. In addition, in the rubber coating by the calendar machine, the start and end portions of the processing cannot be used, so that it is necessary to increase the processing amount in consideration of this.
[0004]
In addition, for hoses and joints, it is necessary to change the inner diameter of the product in accordance with the pipe diameter. In this case, even if the inner diameter is changed, the pressure resistance must be kept constant. Therefore, the density of the reinforcing cord needs to be sparse when the diameter is small, and the density is dense when the diameter is large. Since the density of the reinforcing cord cannot be easily changed, it has been dealt with by changing the number of plies.
[0005]
Therefore, there is a method of using a rubber-coated cord in which a single fiber (one piece) is covered with rubber instead of using the above-described calendar machine. However, in the case of a single fiber, there is a problem that it takes time to form a rubber layer (wrapping a rubber-coated cord). In addition, a mechanism that can easily change density density is desired even in the case of a single fiber, so as to be able to cope with a large variety and small volume production in recent years.
[0006]
The present invention has been made in view of the above circumstances, and the problem is that it is possible to shorten the formation time of the rubber layer using the rubber-coated cord and to easily change the density of the cord. An object of the present invention is to provide an extrusion apparatus and extrusion method for a rubber-coated cord.
[Means for Solving the Problems]
In order to solve the above problems, an apparatus for extruding a rubber-coated cord according to the present invention includes:
A cord supply unit for supplying a plurality of cords, a rubber supply unit for supplying a rubber material to be coated on the cords, and a base part for extruding the plurality of rubber-coated cords in a row. An apparatus for extruding a rubber-coated cord,
It has a guide part that guides the width direction of the row of rubber-coated cords pushed out from the base part, and further has a guide width changing mechanism that can change the guide width.
[0007]
The operation and effect of the rubber-coated cord extruding device having this configuration is as follows. That is, a plurality of cords are supplied to the cord supply unit, and rubber is supplied to the rubber supply unit. A plurality of rubber-coated rubber-coated cords are extruded from the base portion in a row. In other words, since the rubber-coated cord is not processed in units of one, but is processed in a plurality of pieces, the processing time can be shortened, for example, when the cords are wound. Moreover, the guide part which guides the width direction of the row-shaped rubber-coated cord extruded from the base part is provided. The guide width can be changed. That is, if the guide width is changed, the density of the reinforcing cord can be easily changed. As a result, it is possible to provide a rubber-coated cord extrusion apparatus that can shorten the formation time of the rubber layer using the rubber-coated cord and can easily change the density of the cord. The method of using the extruded rubber-coated cord is not limited to a specific one. That is, a rubber layer as a product may be directly formed, or it may be wound up in the form of a roll at one end, and then a rubber-coated cord may be drawn again from the roll to cut out a rubber layer used as a product. Possible forms.
[0008]
As a preferred embodiment of the present invention, there may be mentioned one in which a second guide part is further provided between the base part and the guide part.
By providing the second guide portion, the rubber-coated cord can be guided to the guide portion in a more stable state.
[0009]
As another preferred embodiment of the present invention, a plurality of openings corresponding to the number of cords are formed in the base, and the plurality of openings are arranged in a staggered manner. can give.
[0010]
When a plurality of openings are formed in the base portion, if the openings approach each other, it becomes difficult to process the openings. Therefore, by arranging the openings in a zigzag pattern, the distance from the adjacent openings can be increased, and the manufacture of the base is facilitated. The plurality of rubber-coated cords extruded from the base part also have a staggered shape, but can be restored to a linear state by the guide part or the second guide part.
[0011]
As yet another preferred embodiment of the present invention, a plurality of openings corresponding to the number of cords are formed in the base part, and the plurality of openings are located at both ends in the width direction. Examples of the two openings include those in which the opening shapes at the extreme ends in the width direction are formed on the oblique sides in the same direction.
[0012]
The rubber-coated cord extruded from the base part becomes a strip-like rubber when passing through the guide part. For example, consider a state where the strip rubber is wound around a drum. In this case, it is necessary to abut end portions of the strip rubber in the width direction (see FIG. 8). However, in actuality, it is difficult to butt the ends, and gaps are formed or overlapped with each other, so that the desired winding state is not achieved. Therefore, the opening shape at the extreme ends in the width direction is set to the hypotenuse for the two openings positioned at both ends in the width direction. With this configuration, the strip rubber produced from the plurality of rubber-coated cords extruded from the base portion has both end portions in the width direction formed on the hypotenuses, so that the end portions can be easily butted together.
[0013]
As still another preferred embodiment of the present invention, the guide portion includes a guide recessed portion corresponding to the cross-sectional shape of the rubber-coated cord.
By providing such a guide recess, the rubber-coated cord can be guided more reliably.
[0014]
As yet another preferred embodiment of the present invention, a cross-sectional shape of the opening formed in the base part is an elliptical shape, and the major axis direction of the ellipse is matched with the width direction.
[0015]
By covering the rubber so as to have such an elliptical shape, even if the guide width is changed in the guide portion, adjacent rubber-coated cords can be reliably bonded to each other.
[0016]
In order to solve the above problems, a method for extruding a rubber-coated cord according to the present invention is as follows.
Supplying a plurality of codes;
Supplying a rubber material to be coated to the cord;
A method of extruding a rubber-coated cord, comprising a step of extruding a plurality of rubber-coated cords in a row from a base portion,
Having a step of guiding the width direction of the row-shaped rubber-coated cords extruded from the base part by a guide part;
It has the step which changes the guide width in this guide part at an appropriate timing.
The operations and effects of this configuration are as described above. Although the timing for changing the guide width is not limited to before the extrusion molding operation is started, it can be changed during the extrusion molding. Thereby, the density of one rubber product (rubber layer) can be changed depending on the place.
[0017]
As a preferred embodiment of the present invention, one in which types of the plurality of cords are different can be mentioned.
[0018]
That is, the plurality of codes are not all of the same type, but can be of different types. Thereby, it can respond to various needs.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of an apparatus for extruding a rubber-coated cord according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of the apparatus, where (a) is a front view and (b) is a side view. FIG. 2 is a perspective view showing an outline of the apparatus.
[0020]
<Device configuration>
The main part of the apparatus is composed of a part for extruding a rubber-coated cord. A code is supplied to the code supply unit 1 from the direction of arrow A in FIG. This cord is a reinforcing cord that reinforces the rubber layer, and is formed of metal fiber, synthetic fiber, chemical fiber, or the like. A plurality of codes are supplied in a line.
[0021]
A passage through which the cord passes is provided in the center of the main body 3. A cord guide 6 is fastened to the main body 3 via a set screw 4 and a nut 5. A passage through which the cord passes is formed in the central portion of the cord guide 6. The passage of the cord is formed in a horizontal direction, but the passage of the rubber material is inclined (30 to 45 degrees) with respect to the passage of the cord. The rubber material is supplied from the arrow B direction. An extension nozzle 7 is inclined and attached above the main body 3, and a flange 8 for attaching a small extruder (not shown) is further attached to the extension nozzle 7.
[0022]
The crossing position of the cord passage and the rubber material passage is the joining portion 9, and the cord is covered with the rubber material. A die 11 (corresponding to a cap part) is attached to the front end of the main body 3 with a fixing screw 10. The dice 11 are formed with a plurality of openings in a row. This will be described later. The die 11 is extruded from a rubber-coated cord.
[0023]
A converging roll 20 (corresponding to a guide portion) is provided in front of the die 11. The converging roll 20 also has a function of guiding the width direction of a plurality of extruded rubber-coated cords. FIG. 3 is an enlarged view showing the configuration of the converging roll 20. The converging roll 20 includes a shaft portion 21 and a pair of movement guides 22 that can move along the shaft portion 21. (A) shows a state in which the movement guide 22 is narrowed, and (b) shows a state in which the movement guide 22 is widened. That is, the moving guide 22 and a mechanism for moving the moving guide 22 function as a guide width changing mechanism. The mechanism for moving the movement guide 22 can be constituted by a motor or a transmission mechanism (gear, pinion rack, cam, etc.).
[0024]
A plurality of rubber-coated cords C are guided between the pair of movement guides 22 described above. In addition, by changing the guide width in this way, it is possible to change the density state of the cords in a plurality of rubber-coated cords to be manufactured (a composite of the plurality of cords and rubber is referred to as a multi-cord). Note that the surface of the moving guide 22 that contacts the rubber-coated cord is an inclined surface to facilitate the guide.
[0025]
FIG. 3 (c) shows the positional relationship of the rubber-coated cords immediately after being extruded from the die 11, and the adjacent rubber-coated cords C are adjacent to each other by the converging roll 20, although a gap is open. The rubber-coated cord C to be joined is joined. In the rubber-coated cord C, the fiber C1 is disposed at the center, and the rubber C2 is coated so as to surround the periphery thereof.
[0026]
The cross-sectional shape of the rubber-coated cord C is not limited to a specific cross-sectional shape, but an elliptical shape is preferable as shown in FIG. The major axis direction of the ellipse coincides with the width direction of the multicode. If an elliptical shape is used, even if the cord density is sparse as shown in FIG. 3B, the bonding between adjacent rubber-coated cords can be maintained. The size of the elliptical rubber-coated cord C is, for example, about a long axis x = 2 mm and a short axis y = 1 mm. Any shape is acceptable as long as it is not a pure ellipse but is close to an ellipse (a horizontally long shape such as an ellipse). Moreover, it is good also as a horizontally long rectangular shape.
[0027]
FIG. 4 is a diagram showing another embodiment of the convergence roll 20. In this configuration example, a plurality of guide recesses 21 a are formed in the shaft portion 21. The shape of the recess 21a is preferably a shape corresponding to the cross-sectional shape of the rubber-coated cord C to be formed. Thereby, a guide can be performed more reliably.
[0028]
<Configuration of dice>
Next, a configuration example of the die 11 will be shown. FIG. 5 is a diagram illustrating a configuration example of the die 11 according to the first embodiment. In this example, nine square openings 11a are formed in a row (horizontally). In this case, the cross-sectional shape of the rubber-coated cord is also square. The length of one side of the square is, for example, about 0.9 mm.
[0029]
FIG. 6 is a diagram illustrating a configuration of the die 11 according to the second embodiment. In FIG. 5, the shapes of the openings 11a are all the same, but in FIG. 6, the openings 11b and 11c located at both ends in the width direction have a trapezoidal cross section. In particular, the sides 110 and 111 at the extreme ends in the width direction are formed as hypotenuses and are inclined at the same angle. In the case of the dice shown in FIG. 5, the cross-sectional shape of the multi-cord 30 is a rectangle. Considering the case where the multi-cord 30 is wound around the winding drum, as shown in FIG. 8A, unless the end portions 30a of the adjacent multi-cord 30 are accurately matched, the end portions 30a and Since a gap is formed between the portions 30a or one end 30a rides on the other end 30a, a desired shape may not be obtained. Therefore, when the die 11 as shown in FIG. 6 is used, as shown in FIG. 8B, the end portion 30a of the multi-cord 31 is not a vertical but a hypotenuse. Thereby, the butt | matching of the edge parts 31a of the multi cord 31 can be joined smoothly.
[0030]
FIG. 7 is a diagram illustrating a configuration of the die 11 according to the third embodiment. In this example, the plurality of openings 11d are formed in a row but in a staggered pattern. In the configuration example of FIGS. 5 and 6, it is difficult to manufacture the dies 11 because the openings are close to each other. However, if the dies 11 are staggered, the distance between the openings can be increased. It becomes easy. When staggered, a plurality of rubber-coated cords extruded from the dies 11 are also staggered, but can be corrected to a horizontal state by a guide mechanism.
[0031]
FIG. 9 is a diagram illustrating a configuration example in which another second guide portion is provided between the die 11 and the converging roll 20. A guide roll 24 and a guide roll 23 are arranged from the side closer to the die 11. The guide width becomes smaller toward the downstream side. For example, when the guide width of the convergence roll 20 is 7 mm, the guide width of the guide roll 23 is 9 mm, and the guide width of the guide roll 24 is 13 mm. Thereby, it is possible to more reliably guide the row-shaped rubber-coated cord in the width direction. In the guide roll 24 closer to the die 11, the rubber-coated cord C passes above the roll, the guide roll 23 passes below the roll, and the convergence roll 20 passes above the guide. When arranging a plurality of openings in a staggered manner, this is a suitable guide mechanism.
[0032]
<Another embodiment>
The number of cords constituting the multicode is not particularly limited, but is preferably 2 to several tens, and particularly preferably 10 to 15. The cross-sectional shape of the rubber-coated cord (that is, the shape of the opening of the die 11) is not limited to a specific one, and various cross-sectional shapes can be adopted.
[0033]
When supplying a plurality of cords, it is not necessary to supply all the cords with the same material, and cords of different materials can be supplied at the same time. For example, a multi-cord that combines a synthetic fiber or a chemical fiber and a metal fiber can be manufactured. Thereby, multi-code of various quality can be obtained. Therefore, it can meet various user needs.
[0034]
In the present embodiment, the guide width is changed by moving the moving guide 22 of the converging roll 20, but several types of guide rolls having different guide width dimensions (the dimensions are fixed) are prepared. Alternatively, the guide width may be changed by exchanging this.
[0035]
There are other ways to change the code density. For example, the amount of attached rubber can be changed by changing the amount of rubber supplied and the pressure when extrusion is performed from the die 11. Increasing the screw rotation speed of the extruder can increase the rubber adhesion amount, and decreasing the rotation speed can decrease the rubber adhesion amount. It can also be adjusted by adjusting the amount of rubber to be supplied. In addition, the amount of rubber adhesion can be reduced by increasing the multi-code take-up speed.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing an outline of a rubber-coated cord extrusion device, where (a) is a front view and (b) is a side view.
FIG. 2 is a perspective view showing an outline of an apparatus for extruding a rubber-coated cord. FIG. 3 is a diagram showing a configuration of a converging roll. FIG. 4 is a diagram showing another embodiment of the converging roll. FIG. 6 is a diagram showing a configuration example of a die according to the second embodiment. FIG. 7 is a diagram showing a configuration example of a die according to the third embodiment. FIG. 8 is a cross-sectional shape of a multicode. FIG. 9 is a diagram showing another embodiment of the guide unit.
DESCRIPTION OF SYMBOLS 1 Code supply part 2 Rubber | gum supply part 3 Main-body part 11 Dice 11a, 11b, 11c, 11d Opening part 20 Converging roll 21 Shaft part 21a Recessed part 22 Movement guide C Rubber-coated cord

Claims (8)

A cord supply unit for supplying a plurality of cords, a rubber supply unit for supplying a rubber material to be coated on the cords, and a base part for extruding the plurality of rubber-coated cords in a row. An apparatus for extruding a rubber-coated cord,
Extrusion of rubber-coated cord comprising a guide portion for guiding the width direction of the row of rubber-coated cords extruded from the base portion, and a guide width changing mechanism capable of changing the guide width apparatus. The rubber-coated cord extrusion device according to claim 1, further comprising a second guide portion provided between the base portion and the guide portion. The number of openings corresponding to the number of cords is formed in the base part, and the plurality of openings are arranged in a staggered manner. Rubber coating cord extrusion equipment. A plurality of openings corresponding to the number of cords are formed in the base part, and two openings located at both ends in the width direction out of the plurality of openings are respectively at both ends in the width direction. The rubber-coated cord extrusion device according to any one of claims 1 to 3, wherein the opening shape is formed on a hypotenuse in the same direction. The rubber-coated cord extrusion device according to any one of claims 1 to 4, wherein a guide recess corresponding to a cross-sectional shape of the rubber-coated cord is formed in the guide portion. The cross-sectional shape of the opening formed in the base part is an elliptical shape, and the major axis direction of the ellipse is made to coincide with the width direction. Rubber coating cord extrusion equipment. Supplying a plurality of codes;
Supplying a rubber material to be coated to the cord;
A method of extruding a rubber-coated cord, comprising a step of extruding a plurality of rubber-coated cords in a row from a base portion,
Having a step of guiding the width direction of the row of rubber-coated cords extruded from the base part by a guide part;
A method for extruding a rubber-coated cord, comprising a step of changing the guide width in the guide portion at an appropriate timing. The method for extruding a rubber-coated cord according to claim 7, wherein the types of the plurality of cords are different.

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