JP4777079B2 - Manufacturing apparatus and method for manufacturing corded rubber tape - Google Patents

Description

  The present invention relates to an apparatus for manufacturing a corded rubber tape in which a plurality of cords are arranged and covered with rubber to form a tape, and a method for manufacturing the same.

  As shown in FIGS. 8 and 9, this type of rubber tape 9 is spirally wound around the surface of a rubber-coated product A such as a pumping tube of a squeeze pump, and is used to form a reinforcing layer of the pumping tube A. Sometimes. The reinforcing rubber tape 9 is formed into a tape shape by topping (covering) a reinforcing cord 4 made of synthetic fiber such as steel cord, nylon, polyester, or aramid fiber with rubber. Depending on the shape, the density conversion of the rubber-coated cord 4 may be necessary.

  For example, when the rubber-coated product A is the pumping tube shown in FIGS. 8 and 9, on the discharge side, a truncated cone shape in which the diameter of the pumping tube becomes narrower toward the tip so as to increase the flow rate of the concrete passing through the inside. (Large diameter side diameter D1, small diameter side diameter D2, length L) is known (see Patent Document 1), when the reinforcing rubber tape 9 is spirally wound around the outer surface of the pumping tube A, In order to suppress deformation and twisting due to the internal pressure of the pumping tube A, the rubber tape 9 is biased so that the cord angle θ is constant (for example, 55 degrees which is a static angle) at any point in the tube axis direction of the pumping tube A. It is desirable to be pasted.

  When winding with the cord angle θ kept constant, in the truncated cone shape, it is necessary to make the cord 4 dense on the small diameter side and sparse on the large diameter side.

  As shown in FIGS. 10 and 11, when the cord angle θ is kept constant and the rubber tape 9 is spirally wound so as not to overlap each other while abutting the side ends thereof, the larger the diameter is from the larger diameter side to the smaller diameter side. Since the helical pitch becomes smaller, the cord interval and the tape width H become smaller from the larger diameter side toward the smaller diameter side.

As described above, as a method of changing the code interval (code density) and the tape width from the large diameter side toward the small diameter side, Patent Document 1 discloses two types of inclined rollers that hold the respective cords with different guide pitches. It is disclosed that a plurality of cords prepared and covered with unvulcanized rubber are provided.
Japanese Patent Laid-Open No. 11-058544

  However, in the method of covering the cord between two types of inclined rollers with unvulcanized rubber, inclined rollers having different guide pitches must be prepared every time the truncated cone-shaped taper angle is changed.

  Also, when the axial length of the truncated cone is long and the distance between the two types of inclined rollers for manufacturing the reinforcing rubber tape is long, the cord interval existing between them is accurately set to the desired interval. It is not always retained. Therefore, the cord density and tape width conversion method using two types of inclined rollers is not necessarily the best method for producing rubber tape.

  In view of the above, an object of the present invention is to provide an apparatus and a method for manufacturing a corded rubber tape capable of converting a cord interval and a tape width at low cost and accurately.

  In order to solve the above-described problems, a corded rubber tape manufacturing apparatus according to the present invention includes a rubber-coated head that feeds a rubber-coated cord from a plurality of arrayed die holes, and the rubber-coated cord from the rubber-coated head. An inclined roller that is twisted with the rubber-coated cord group interposed between the rubber-coated head and the take-up means. It is installed so as to be orthogonal to the drawing direction of the covering cord group, and the inclined roller is inclined with respect to the arrangement direction of the rubber covering cord. Here, the arrangement direction of the rubber-coated cords means the arrangement direction of the rubber-coated cords in the group of rubber-coated cords drawn by the take-out means without using the inclined rollers.

  According to the above-described configuration, the rubber-covered cord group at a position farther from the tilting center is more tensioned by inclining the rubber-coated cord group pulled out by the take-off means with the inclined rollers and tilting with respect to the arrangement direction of the rubber-coated cord. Will take. Since the rubber-coated cord converges toward the tilt center according to the tension, the width of the rubber-coated cord group and the rubber-coated cord interval can be changed. That is, the code interval (density) and the tape width can be accurately converted at the same magnification.

  As the inclined roller, a pair of cylindrical sandwiching rollers arranged so that their rotational axes are parallel to each other can be used. In this case, a rubber-coated cord group may be sandwiched between both the sandwiching rollers. The inclined roller having the above-described configuration is installed so that the roller rotation shaft, that is, the rotation shaft of each pinching roller is orthogonal to the drawing direction of the rubber-coated cord group.

  However, in order to accurately convert the width of the rubber-coated cord group and the interval between the rubber-coated cords, it is desirable that the moving distance of the rubber-coated cord that converges toward the tilt center is as short as possible. Therefore, in the present invention, in the inclined roller composed of a pair of cylindrical sandwiching rollers, the inclined roller center line that is parallel to the rotational axis of the sandwiching roller and passes between the two rotational shafts is the rubber-coated cord group. It was arranged so as to pass through the center line in the drawing direction, and the inclined roller was inclined about the center line in the drawing direction of the rubber-coated cord group so that the moving distance of the rubber-coated cord was as short as possible.

  When the inclined roller is inclined, each holding roller may be tilted about the pulling direction center line of the rubber-coated cord group, and each holding roller is rotated about the drawing direction center line of the rubber-coated cord group. You may make it move.

  When the tilt roller is tilted, the conversion amount of the code density and the tape width increases as the tilt angle of the tilt roller with respect to the direction in which the die holes are arranged increases. However, if the tilt angle of the tilt roller becomes too large, rolling of the rubber-coated cord occurs on the surface of the tilt roller, and there is a possibility that the center in the tape width direction may be curved when formed into a corded rubber tape.

  Therefore, in the present invention, a plurality of inclined rollers are provided so that the inclination angle with respect to the arrangement direction of the rubber-coated cords is different between adjacent inclined rollers. That is, by installing a plurality of inclined rollers, the width of the rubber-coated cord group and the interval between the rubber-coated cords are changed between the inclined rollers.

  At this time, since the amount of change in the width of the rubber-coated cord group and the interval between the rubber-coated cords depends on the difference in the inclination angle between the adjacent inclined rollers, the difference in the inclination angle between the respective inclined rollers is set to an appropriate value. While preventing the roll of the cord, the rubber-coated cord tape having a large conversion amount of the cord density and the tape width can be finally obtained by gradually changing the width of the rubber-coated cord group and the interval of the rubber-coated cord.

  As described above, in the present invention, a rubber-coated cord group is drawn out from a rubber-coated head by a take-up means as a rubber-coated cord group, and the rubber-coated cord group is molded into a tape shape to form a rubber tape with a cord. A corded rubber tape characterized in that, during manufacture, the width of the rubber-coated cord group and the interval between the rubber-coated cords are changed by twisting the rubber-coated cord group between the rubber-coated head and the take-off means. A manufacturing method is provided. Specifically, it becomes possible to produce a tape-like rubber tape with cords by gradually twisting the rubber-coated cord group.

  In the present invention, an inclined roller is installed between the rubber-coated head and the take-out means for pulling out the rubber-coated cord group in a state where the rubber-coated cord is arranged from the rubber-coated head. The roller is installed so that the roller rotation shaft is orthogonal to the drawing direction of the rubber-coated cord group, and the inclined roller is inclined with respect to the arrangement direction of the rubber-coated cord group. In addition, it is possible to change the interval between the rubber-coated cords.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an apparatus for producing a corded rubber tape. An apparatus for producing a corded rubber tape according to the present invention is for producing a corded rubber tape for wrapping around a truncated cone-shaped rubber-coated product A such as a pumping tube. As shown in FIG. 1, the manufacturing apparatus includes a rubber coating machine having a rubber coating head 3 having an extrusion die 2 and a plurality of rubbers in which a plurality of cords 4 introduced into the rubber coating head 3 are arranged. The rubber-coated cord group 10 composed of the coated cord 5 is disposed between the take-out means to be pulled out from the extrusion die 2, the rubber-coated head 3 and the take-up roller 6, and the width of the rubber-coated cord group 10 and the interval between the rubber-coated cords 5 are set. And an inclined roller 7 for changing. In the present embodiment, the take-up roller 6 is used as take-up means.

  The rubber coating machine includes a rubber coating head 3 and a rubber extruder (not shown) connected to the base 3a side of the rubber coating head 3, and the coated rubber kneaded from the rubber extruder is rubber in the direction of arrow B. It is supplied to the coating head 3.

  An extrusion die 2 is attached to one side of the rubber-coated head 3, and a plurality of die holes 8 are arranged in the extrusion die 2 from the upstream side to the downstream side in the coated rubber supply direction B. . In order to form the die holes 8 in an array, specifically, the die holes 8 can be formed in a line on a straight line at regular intervals, or in a zigzag form in two lines. In the present embodiment, the die holes 8 are formed in two staggered rows.

  The kind of the cord 4 used in the present invention is not particularly limited, and a cord made of nylon, polyester, rayon, aramid, steel or the like can be used. Among them, in particular, when a cord having a low rubber impregnation property such as a steel cord having a stranded wire structure is used, it is possible to obtain the rubber-coated cord 5 in which the amount of rubber is uniform and the rubber is impregnated into the cord.

  A take-up roller 6 is arranged on the extrusion die 2 side of the rubber-coated head 3, that is, on the outlet side of the rubber-coated head 3. The plurality of cords 4 inserted into the rubber-coated head 3 pass through the rubber-coated head 3 in a substantially parallel and lined state, and from the plurality of die holes 8 arranged in the extrusion die 2, the rubber-coated cords. The rubber-coated cord group 10 in which 5 is arranged is drawn toward the take-up roller 6.

  In the present embodiment, the take-up roller 6 is arranged so as to draw out the rubber-coated cord 5 in the axial direction of the die hole 8. The take-up roller 6 is composed of a set of three rollers 6 a, 6 b and 6 c, and each of the rollers 6 a, 6 b and 6 c has a rotation axis in a direction perpendicular to the drawing direction C of the array 10, and It is arranged in a zigzag pattern along the drawing direction C. The rubber-coated cord group 10 is wound around these rollers 6 a, 6 b and 6 c and is pulled out from the rubber-coated head 3 by the rotation of the take-up roller 6.

  In the present embodiment, as the inclined roller 7, three inclined rollers, a first inclined roller 7a, a second inclined roller 7b, and a third inclined roller 7c, are installed at intervals between the rubber-coated head 3 and the take-up roller 6. Has been. Each of the inclined rollers 7a, 7b and 7c is composed of two sandwiching rollers 12 having a cylindrical shape and the same shape. In these inclined rollers 7 a, 7 b and 7 c, the pair of sandwiching rollers 12 are arranged so as to face each other with the rubber-coated cord group 10 interposed therebetween, and the roller rotation shaft 13 is in the drawing direction C of the rubber-coated cord group 10. They are installed so as to be orthogonal to each other.

  In the inclined rollers 7a, 7b, and 7c, the gap between the pair of sandwiching rollers 12 and 12 is set to be the same as or slightly wider than the thickness of the rubber-coated cord 5, whereby the rubber-coated cord 5 is configured to be slidable in the direction of the rotary shaft 13 through the gap between the sandwiching rollers 12 and 12.

  The inclined roller 7 will be described by taking the first inclined roller as an example. FIG. 2 is a front view showing the first inclined roller 7a. The first inclined roller 7 a has a pair of sandwiching rollers 12, 12 arranged so that the roller rotation shafts 13 are parallel to each other, and the rubber-coated cord group 10 is sandwiched between the sandwiching rollers 12, 12. ing.

  A line parallel to the roller rotation shaft 13 and passing through the middle of both rotation shafts 13 and 13 is an inclined roller center line 14a. That is, the center line 14a of the first inclined roller 7a is a line that passes through a position that is L / 2 away from both the rotary shafts 13 and 13 when the distance L between the rotary shafts 13 and 13 is set. Similarly, the other inclined rollers 7b and 7c are parallel to the roller rotation shaft 13 and pass through the middle of both rotation shafts 13 and 13, respectively, as inclined roller center lines 14b and 14c.

  3 is a cross-sectional view taken along line AA in FIG. The rubber-coated cords 5 fed out from the extrusion die 2 of the rubber-coated head 3 are drawn out as a rubber-coated cord group 10 in a state of being arranged in the direction of arrow D.

  The die holes 8 are formed in two staggered rows from the upstream side to the downstream side along the coated rubber supply direction B, but in FIG. It has become. Both the arrangement direction of the die holes 8 and the arrangement direction of the rubber-coated cord 5 are in the direction of the arrow D.

  Next, an aspect when the inclined roller 7 is inclined will be described with reference to FIGS. 4 and 5. FIG. 4 is a view showing the positional relationship between the first inclined roller 7 a and the rubber-coated head 3 when the extrusion die 2 of the rubber-coated head 3 is viewed from the front. As described above, the first inclined roller 7a is installed such that the roller rotation shaft 13 is orthogonal to the pulling direction C of the rubber-coated cord group 10, and the center line 14a of the first inclined roller 7a is rubber-coated. The cord group 10 is arranged so as to pass through the center line 15 in the lead-out direction. The first inclined roller 7a is configured such that the roller center line 14a can be inclined about the center line 15 in the drawing direction of the rubber-coated cord group 10.

  The inclination angle of the inclined roller 7 is expressed with reference to the arrangement direction D of the rubber-coated cord 5. Specifically, the inclination angle of the first inclined roller 7a in FIG. 4 is the arrangement of the first inclined roller center line 14a and the arrangement of the rubber-coated cord 5 in the rubber-coated cord group 10 drawn by the take-up roller 6 without passing through the inclined roller 7. The angle α is formed by the direction D.

  FIG. 5 is a diagram showing a positional relationship between the first inclined roller 7a and the second inclined roller 7b. FIG. 5 shows a state when both inclined rollers are viewed in the direction of the center line 15 of the rubber-coated cord group 10. In the present embodiment, the inclination angle of the first inclination roller 7a is α, and the inclination angle of the second inclination roller 7b is 0 °.

  That is, by setting the difference in inclination angle between the first inclined roller 7a and the second inclined roller 7b as α, the width of the rubber-coated cord group 10 and the interval between the rubber-coated cords 5 are increased by the inclination angle difference α in this section. To change. Further, the inclination angle of the third inclined roller 7c is set to α (not shown), so that the inclination angle difference between the second inclined roller 7b and the third inclined roller 7c is also set to α. Yes.

  As described in detail above, when a plurality of inclined rollers 7 are installed, the width of the rubber-coated cord group 10 and the interval between the rubber-coated cords 5 are changed between the inclined rollers by changing the inclination angle between the adjacent inclined rollers. Finally, a corded rubber tape 9 with a large amount of cord density and tape width conversion can be obtained.

  The rubber-coated cord group 10 drawn by the take-up roller 6 can be formed into a tape shape by pressing the rubber-coated cord group 10 using the take-up roller 6. Furthermore, the rubber-coated cord group 10 can be formed into a tape shape using a pressing means such as a pressing roller that presses the rubber-coated cord group 10 with the rubber-coated cord group 10 interposed therebetween.

  The case where the taped corded rubber tape 9 in which the tape width and the cord density are continuously changed in the corded rubber tape manufacturing apparatus having the above-described configuration is manufactured will be described. First, a predetermined number of cords 4 are inserted into the rubber-coated head 3. The cord 4 introduced into the rubber coating head 3 is covered with the coating rubber extruded from the rubber extruder, and is drawn out from the die hole 8 by the take-up roller 6.

  At this time, if the inclination angle of each of the inclined rollers 7a, 7b and 7c is set to 0 °, the rubber-coated cord group 10 is drawn to the take-up roller 6 with a width (H1) when drawn from the die hole 8. A corded rubber tape 9 having a width H1 is obtained.

  Next, in order to gradually change the width of the rubber-coated cord group 10 and the interval between the rubber-coated cords 5, only the first inclined roller 7a needs to be continuously inclined. The inclination angle of one inclined roller 7 is preferably 5 ° to 30 °, and preferably 10 ° to 25 °.

  In order to further reduce the width of the rubber-coated cord group 10 and the interval between the rubber-coated cords 5 beyond this angle, the third inclined roller 7c is continuously inclined while the first inclined roller 7a is inclined. Just do it.

  As described above, each of the inclined rollers 7a, 7b, and 7c may be inclined one by one, or the first inclined roller 7a and the third inclined roller 7c may be simultaneously inclined.

  In the present embodiment, the inclination angle differences between the rubber-coated head 3 and the first inclined roller 7a, between the first inclined roller 7a and the second inclined roller 7b, and between the second inclined roller 7b and the third inclined roller 7c are all. In order to achieve α, the inclination angles of the first inclined roller 7a, the second inclined roller 7b, and the third inclined roller 7c are inclined so as to be α °, 0 °, and α °. In order to obtain the effect, the present invention is not limited to this. For example, the first inclined roller 7a, the second inclined roller 7b, and the third inclined roller 7c are inclined such that the inclination angles are α °, 0 °, and −α °. You may make it incline so that it may become (alpha), 2 (alpha) degree, and (alpha) degree.

  In this way, when the inclination angle of the inclined roller 7 is gradually increased, as shown in FIG. 6, the tape width is gradually reduced from H1 having a wide tape width on one end side to H2 toward the other end side. A corded rubber tape 9 can be obtained. The corded rubber tape 9 has a denser cord density as the tape width becomes smaller.

  The corded rubber tape 9 drawn to the take-up roller 6 is wound around the circumference of the rotating drum. The rotating drum may be one in which a truncated cone-shaped rubber-coated product A is formed, or may be a roll in which the produced rubber tape is wound and stored.

  When the corded rubber tape 9 is wound around the truncated cone-shaped rubber-coated product A, the rubber tape 9 is inclined at the same angle (angle θ in FIG. 9) with respect to the axial direction of the rubber-coated product A, as shown in FIG. Can be wrapped around. The surface to be reinforced of the rubber-coated product A is not particularly limited, and any of the inner rubber layer, the intermediate rubber layer, and the surface rubber layer formed on the surface of the tapered mandrel may be used as the reinforced surface. Examples of the rubber-coated product A made of rubber tape include a frustum-shaped pumping tube, a different diameter rubber pipe joint, a rubber hose, and the like.

  In this embodiment, the taper-shaped rubber tape is manufactured. However, by stopping the rotation of the inclined roller 7 at an arbitrary angle, rubber tapes having various widths can be manufactured.

  An evaluation test of the amount of change in the width H of the rubber-coated cord group 10 was performed using the cord rubber tape manufacturing apparatus described in the above embodiment. The test conditions are as follows.

  As the cord 4, 55 steel cords having a fiber diameter of φ1.2 mm were used. Natural rubber (hardness 85 degrees) was used as the covering rubber, and this was supplied to the rubber covering head 3 while being extruded by a rubber extruder (extrusion temperature: 80 ° C.). The temperature of the extrusion die 2 was 95 ° C., the cord drawing speed was 5 m / min, and the coated rubber was topped on the cord 4.

  As the inclined roller 7, five pairs of rollers were used. Each of the inclined rollers used two sandwiching rollers that are cylindrical rollers each having a diameter of 100 mm, and these were opposed to each other so that a gap between the sandwiching rollers was 2.2 mm. Table 1 shows the installation position and the inclination angle of each inclined roller.

  As shown in Table 1, the inclination angle difference between the inclined rollers was set to α. Under such conditions, the amount of change in the width of the rubber-coated cord group 10 was measured. The results are shown in Table 2. In Table 2, the width H (100 mm) of the rubber-coated cord group 10 immediately after being pulled out from the die hole 8 is defined as 100%, and the ratio of the reduced width is expressed in%.

  From Table 2, it was confirmed that the width H of the rubber-coated cord group decreased as the inclination angle α increased and the number of inclined rollers increased. However, as compared with the amount of decrease in H by the first pair of inclined rollers, the effect of decreasing H becomes smaller as it goes to the downstream inclined roller. This is probably because the density of the rubber-coated cord before returning is higher in the inclined roller on the downstream side, and a resistance force acts on the force that the rubber-coated cord tends to converge on the center.

Schematic diagram of a corded rubber tape manufacturing apparatus according to the present invention The front view which shows the 1st inclination roller in FIG. AA sectional view in FIG. The figure which shows the positional relationship of a 1st inclination roller and a rubber coating head The figure which shows the positional relationship of a 1st inclination roller and a 2nd inclination roller Top view of the corded rubber tape manufactured by the manufacturing apparatus of FIG. Perspective view of rubber-coated product with corded rubber tape wound spirally Perspective view showing how to wrap rubber tape in tapered rubber hose Plan view of FIG. A perspective view schematically showing a case where a rubber tape is wound around a truncated cone while maintaining a constant cord angle θ. 10 is a development view of the truncated cone shape of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nipping roller 2 Extrusion die 3 Rubber coating head 4 Cord 5 Rubber coating cord 6 Take-off roller 7 Inclination roller 8 Die hole 9 Rubber tape with cord 10 Rubber coating cord group 12 Nipping roller 13 Rotating shaft of sandwiching roller 14 Center line 15 of tilting roller 15 Pull-out direction center line of rubber-coated cord group A Rubber-coated product B Rubber supply direction C Pull-out direction of rubber-coated cord group D Array direction of rubber-coated cord

Claims (4)

A rubber-coated head that feeds rubber-coated cords from a plurality of arrayed die holes; and a pull-out means that draws out the rubber-coated cords from the rubber-coated head as a group of rubber-coated cords. An inclined roller that is twisted with the rubber-coated cord group interposed therebetween is installed between the take-up means and the take-up means, and the inclined roller comprises a pair of cylindrical holding rollers arranged in parallel to each other, and the holding roller Of the rubber-coated cord group in a state where the rubber-coated cord group is sandwiched between the sandwiching rollers. An apparatus for producing a corded rubber tape, wherein the apparatus is inclined with respect to the center . The inclined roller is more established, the inclined rollers, the inclination angle with respect to the arrangement direction of the rubber coated cord is claim 1 cords rubber tape of a manufacturing apparatus, wherein the different inclined roller adjacent. A rubber-coated cord group is drawn out from a rubber-coated head by a take-up means as a rubber-coated cord group, and when the rubber-coated cord group is formed into a tape shape to produce a cord-containing rubber tape, The width of the rubber-coated cord group and the interval between the rubber-coated cords are changed by twisting the rubber-coated cord group around the center line in the drawing direction of the rubber-coated cord group with the take-out means. A method for producing corded rubber tape. 4. The method for producing a corded rubber tape according to claim 3 , wherein a taped corded rubber tape is obtained by gradually twisting the rubber-coated cord group.

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