JP3727874B2 - Elastomer coating equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for coating a stranded wire with an elastomer material such as rubber.
[0002]
[Prior art]
A rubber extruder is used as a means of coating rubber on a stranded wire such as a steel cord for reinforcing tires, and the stranded wire is passed through a cored bar having a hole slightly larger than the diameter of the stranded wire and led to the rubber chamber of the rubber extruder. Conventionally, after the rubber is coated, it is passed through a die to obtain a predetermined finished diameter.
[0003]
[Problems to be solved by the invention]
By the way, by twisting a plurality of strands into a stranded wire and then passing through a rubber extruder to coat the rubber, not only two steps of a twisting step and an extruding step are required, but for example a closed type In the case of a steel cord for reinforcing tires, there is a gap closed at the center of the cord, and since the rubber does not penetrate in the tire molding process, it remains as a hollow portion after tire molding, It causes cord corrosion due to the intrusion of etc.
[0004]
Therefore, it is required that rubber or the like can be coated at the same time in the twisting process and that the voids inside the twisted wire are filled with rubber or the like. And as a method of satisfying the requirement, it is considered that rubber is coated around each element wire in a line-separated state before twisting and then twisted to form a twisted wire. According to this method, the rubber can be coated at the same time in the twisting process, and the void in the central portion of the stranded wire is filled with the coated rubber, so that intrusion of moisture and the like can be prevented. However, when rubber is coated around each strand in the state before being twisted in this way, when the strands are gathered and twisted together at the twisting port, the strands are rubbed at the twisting port. As a result, the coated rubber is peeled off and the rubber coating around the stranded wire becomes inhomogeneous.
[0005]
The present invention prevents the elastomer coating around the stranded wire from becoming inhomogeneous when the strands coated with an elastomer material such as rubber are twisted together in the stranding state in the twisting process to form an elastomer composite stranded wire. The purpose is to do.
[0006]
[Means for Solving the Problems]
The elastomer coating apparatus of the present invention is provided with a wire dividing part having a plurality of holes for dividing the wires supplied to the twisting machine, and a twisting port for collecting the wires passing through the holes of the wire dividing part. In addition, an elastomer chamber in which the elastomer material is extruded so as to cover the elastomer material around each strand that has passed through the hole in the line dividing portion is provided between the line dividing portion and the twist opening, and the divided portion, an elastomer passage elastomeric material is extruded so as to cover the elastomeric material again, the passage to the die hole the bunch of wires having traversed passage provided around the bundle of strands assembled by twisting port An elastomer coating apparatus, wherein the twist opening and the die hole are provided in an integral die part .
[0007]
With this device, the strands are separated by passing them one by one through each hole in the segmentation section, and the bundled strands are assembled into a twist opening, and the bundled strands are formed into die holes. To supply to the twisting machine. At that time, the periphery of each strand passing through the hole of the line dividing portion is covered with the elastomer material extruded in the elastomer chamber. When the strands coated with the elastomer material are gathered at the twist opening and twisted together, the strands are ironed at the twist opening, and a part of the coated elastomer material is peeled off. The bundle of strands is re-coated around the bundle of strands with an elastomer passage, and the bundle of strands re-coated with the elastomer material passes through a die to adjust the diameter of the coated strands. . In this way, a stranded wire in which the voids inside the stranded wire are filled with the elastomer material and the periphery is uniformly coated with the elastomer material is obtained.
[0008]
Then, by providing the twist opening and the die hole in an integral die part, the twist opening and the die hole can be formed at once by a drilling process or the like, and a hole with no runout can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
[0010]
1 to 4 show a configuration of an extruder nozzle tip portion of an elastomer coating apparatus according to an example of an embodiment of the present invention. 1 is an axial cross-sectional view of the tip of an extruder nozzle, FIG. 2 is a cross-sectional view taken along line AA, FIG. 3 is a cross-sectional view through a die hole axis and a rubber passage axis of a die part alone, and passes through the die hole axis. Sectional view (b) and BB sectional view (c) orthogonal to the rubber passage axis, and FIG. 4 are an axial sectional view (a) and a rear view of the core metal alone.
[0011]
The elastomer coating apparatus of this embodiment uses, for example, a rubber extruder in which rubber heated to, for example, about 90 ° C. with warm water in a hopper is pressurized to about 15 MPa with a screw pump or the like and extruded from a nozzle. This rubber extruder is known per se. In FIG. 1, 1 is the nozzle of the rubber extruder. A rubber chamber fitting 2 incorporating a core metal 4 and a die part 6 described later is attached to the tip of the nozzle 1.
[0012]
The rubber chamber metal fitting 2 has a through hole 3 having a circular cross section in a direction orthogonal to the axis of the nozzle 1, and a core metal holder 5 holding a metal core 4 from one end side is inserted into and fixed to the through hole 3. A die holder 7 holding the die part 6 from the end side is inserted and fixed. The rubber chamber fitting 2 has an inlet passage 8 that opens to the outlet of the nozzle 1 and extends in the axial direction of the nozzle 1 to reach the through hole 3, and is separated from the inlet passage 8 toward one end in the axial direction of the through hole 3. An outlet passage 9 extending from the through hole 3 to the opposite side of the inlet passage 8 and opening to the outside is provided.
[0013]
The core metal holder 5 is inserted into the through hole 3 of the rubber chamber fitting 2 from one end side, is bolted to the end surface of the rubber chamber fitting 2 at the flange portion, and is prevented from rotating by the pin 10. The die holder 7 is inserted into the through-hole 3 of the rubber chamber fitting 2 from the other end side, and is bolted to the end surface of the rubber chamber fitting 2 via the fixing fitting 11.
[0014]
The core metal holder 5 reaches the position where the tip in the axial direction passes through the opening of the outlet passage 9 of the rubber chamber fitting 2 and overlaps with the opening of the inlet passage 8 when inserted into the through hole 3 of the rubber chamber fitting 2. In addition, an axial hole 12 having a relatively large diameter that opens toward the end face is formed at the tip portion, and an inlet side opening 13 that opens the axial hole 12 into the inlet passage 8 of the rubber chamber fitting 2 is formed. An outlet side opening 14 is formed on the opposite side opposite to the inlet side opening 13, and an axial groove is formed on the outer peripheral side so that the outlet side opening 14 communicates with the outlet passage 9 of the rubber chamber fitting 2. 15 is formed. The cored bar 4 is fitted and fixed to the reduced diameter hole formed at the bottom of the axial hole 12 at the tip of the cored bar holder 5 by shrink fitting or the like.
[0015]
In the cored bar 4, in order to divide the strand s to be supplied to the stranding machine in the twisting process of the stranded wire production, the number of holes 16 slightly larger than the diameter of the strand s of the strand is equal to the number of strands. (Three in the example shown) are open. Then, in order to pass the wire s fed out toward the hole 16 of the core metal 4 in a lined state through the core metal holder 5, the center portion is penetrated in the axial direction so as to reach the flange side end surface from the back surface. A hole 17 is formed.
[0016]
The die part 6 is provided with a flange portion 19 fitted and fixed in a holder hole 18 formed at one end of the die holder 7, and connected to the flange portion 19, and is fitted into the hole 12 on the distal end side of the core metal holder 5. The body 20 to be supported together, the diameter of the body 20 is reduced from the front end, and protrudes in the axial direction. A die portion 21 is provided which enters between the outlet side opening 14 and opposes in the axial direction with a predetermined gap between the core metal 4. Further, the die portion 21 is provided with a twisting port 22 that collects the strands s that have passed through the holes 16 of the cored bar 4 and passes them forward in the axial direction at the axial center position of the tip part facing the cored bar 4. The twist opening is formed so that the inlet side opening 13 and the outlet side opening 14 of the cored bar holder 5 communicate with each other in a straight line through the gap around the die portion 21 at the axial center of the twist opening 22 in front of the supply direction. A passage 23 that intersects the axis of 22 and penetrates in the radial direction is provided, and a strand that gathers at the base end portion on the body portion 20 side that is further forward of the passage 23 and that crosses the passage 23 A die hole 24 that is coaxial with the twist opening 22 and has substantially the same diameter is provided so as to pass the bundle S of s. Moreover, the axial center part of the trunk | drum 20 of the die component 6 and the flange part 19 is the hole 25 which sends out the bundle | flux S of the strand s which let the die hole 24 pass ahead.
[0017]
With the die part 6 assembled, the axial hole 12 at the tip of the core metal holder 5 is a space between the periphery of the die part 21 of the die part 6 and the core metal 4, and this space is a rubber chamber 26 described later. Configure. Further, a discharge pipe 27 is connected to the outer end of the outlet passage 9 in the rubber chamber fitting 2, and a discharge cock 28 is provided in the discharge pipe 27.
[0018]
This elastomer coating apparatus is used for coating rubber in a stranded wire process such as a steel cord for reinforcing tires. Then, a plurality of strands s fed from a reel (not shown) are passed through the holes 16 of the core bar 4 one by one from the right side in FIG. After gathering at the opening 22, supplying to the front (left side in FIG. 1) twisting machine (not shown) through the die hole 24, twisting, and passing through the hole 16 of the cored bar 4 in the twisting process. The rubber is extruded and coated around each strand s in the line-separated state, and further, the rubber is extruded and coated around the bundle S of the strands s after gathering at the twisting port 22.
[0019]
The rubber is heated to, for example, 90 ° C. by a hopper (not shown), pressurized to about 15 MPa by a screw pump, and extruded from the nozzle 1. Then, the extruded rubber passes through the inlet passage 8 of the rubber chamber fitting 2 and is pushed out from the inlet side opening 13 of the core metal holder 5 into the axial hole 12 at the tip of the core metal holder 5.
[0020]
The axial hole 12 at the tip end portion of the core metal holder 5 forms a rubber chamber 26 between the periphery of the die portion 21 of the die part 6 and the core metal 4, and rubber is pushed into the rubber chamber 26. And in this rubber chamber 26, rubber | gum is coat | covered around each strand s of a line-separated state.
[0021]
Further, each strand s covered with rubber is peeled off to some extent by squeezing when gathering at the twisting opening 22, but the radial passage 23 of the die portion 21 is a rubber passage through which rubber is pushed out through the rubber chamber 26. The bundle S of the strands s after gathering at the twist opening 22 passes through the passage 23, so that the rubber is again coated around the bundle S of the strands s, and the peeled portion is repaired. The
[0022]
Thereafter, the bundle S of the strands s passes through the die hole 24, so that the rubber coated on the periphery becomes uniform, and the diameter after the rubber coating is adjusted. The die hole 24 is designed in consideration of the average thickness of the rubber coating based on the diameter of the stranded wire.
[0023]
The twisted wires thus twisted are filled with an elastomer material, and the periphery is uniformly coated with rubber.
[0024]
In addition, by providing the twist port 22 and the die hole 24 in the integral die part 6, it can be formed at a time by drilling or the like, and becomes a hole with no runout.
[0025]
The present invention is not limited to rubber coating, and can be widely applied to coating of elastomer materials such as rubber and synthetic resin.
[0026]
【The invention's effect】
As is apparent from the above description, according to the elastomer coating apparatus of the present invention, the elastomer material is coated around the strands before being twisted, so that the voids inside the twisted wire are formed in the elastomer material when twisted. As a result, it is possible to obtain a stranded wire that is filled with an elastomer material and is uniformly covered with an elastomer material. And the twist opening and die hole in the apparatus can be formed at once by drilling etc. by providing it in an integral die part, and it can be set as a hole without core runout.
[Brief description of the drawings]
FIG. 1 is an axial sectional view of an extruder nozzle tip of an elastomer extrusion coating apparatus according to an example of an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
3 is a cross-sectional view (a) passing through the die hole axis and the rubber passage axis of the die part alone at the tip of the extruder nozzle in FIG. 1, and a cross-sectional view (b) passing through the die hole axis and perpendicular to the rubber passage axis. It is -B sectional drawing (c).
4 is an axial cross-sectional view (a) and a rear view of a single cored bar at the tip of the extruder nozzle of FIG. 1; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle 2 Rubber chamber metal fittings 4 Core metal 6 Die parts 16 Hole 22 Twist opening 23 Passage (elastomer passage)
24 Die hole 26 Rubber chamber (elastomer chamber)

Claims (1)

A wire section having a plurality of holes for dividing the wires to be supplied to the stranding machine, and a twist port for collecting the wires that pass through the holes of the wire section, are provided. And an elastomer chamber in which the elastomer material is extruded so as to cover the elastomer material around each strand that has passed through the hole of the line dividing portion, and the twist opening on the side opposite to the line dividing portion of the twist opening. An elastomer coating apparatus provided with an elastomer passage through which the elastomer material is extruded so as to coat the elastomer material again around the bundle of strands assembled together, and a die hole through which the bundle of strands across the passage passes. An elastomer coating apparatus, wherein a twist opening and the die hole are provided in an integral die part.

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