JP4109931B2 - Extruder head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a head portion (extruder head) of an extruder that extrudes heated elastomer material such as rubber and resin with a screw pump or the like and coats the periphery of a linear body.
[0002]
[Prior art]
For example, as a means for coating rubber around a stranded wire such as a steel cord for reinforcing tires or a metal wire body such as an element wire thereof, for example, rubber heated with hot water in a hopper is pressurized to about 15 to 20 MPa with a screw pump or the like. Using a head attached to the tip of the nozzle, the metal strip is passed through a cored bar having a hole slightly larger than the diameter of the wire, guided to the rubber chamber, covered with rubber, and then passed through a die. Conventionally, an extruder configured to have a predetermined finished diameter has been used.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, when the reel is replaced after the striated wire is finished for one turn, or when the wire breaks, the extruder is once stopped and the head (extruder head) is disassembled and cleaned. It was necessary to reset the striatum, assemble the head, and start again. When exchanging the reels of the wire rods or connecting the broken portions, the conventional apparatus cannot pass the wire rods from the core bar to the die unless the rubber chamber in the head is once emptied. Therefore, it is necessary to stop the extruder once and empty the rubber chamber.After disassembling and cleaning the head part to remove all the hardened rubber, set the linear body again, assemble the head part, and finally I was able to restart. As described above, in the conventional apparatus, when replacing the reel of the linear member or when the wire is disconnected, time-consuming and troublesome work is forced.
[0004]
The present invention has been made in view of the problems of such conventional devices, and can easily reset a linear body without requiring troublesome work such as disassembly and cleaning when the reel is replaced or disconnected. It is an object of the present invention to provide an extruder head for elastomer coating.
[0005]
[Means for Solving the Problems]
The present invention is configured such that a filament is introduced into an elastomer chamber through a metal core, an elastomer material is extruded into the elastomer chamber, the elastomer material is coated around the filament, and the coated filament is pulled out through a die. The elastomer-coated extruder head has been improved so that the core metal has a predetermined gap between the die and a position where the elastomer is interposed around the filament and a position where the elastomer material is not interposed by contacting the die. The movable cored bar can be interrupted by moving it to a position where it does not interpose the elastomer material by contacting the die, thereby solving the above problems.
[0006]
This extruder head is attached to the nozzle tip of an extruder constituted by a screw pump or the like. Then, the wire rod fed out from the reel is passed from the metal core to the die, and the metal core is set at a position where a predetermined gap is formed between the metal rod and the elastomer around the wire rod. Elastomer material such as resin is extruded from the nozzle into the elastomer chamber and covered around the striated body, and the coated striated body is continuously pulled out through a die to give a predetermined finish. The diameter.
[0007]
Further, when the reel is replaced after the wire is finished for one turn, or when the wire breaks, the cored bar is advanced to a position where the elastomer material does not intervene in contact with the die to interrupt the coating. Then, after passing the previous striated body, the new striated body or the remaining disconnected striated body is passed from the core metal to the die, and is joined to the previous striated body. A predetermined gap is opened between them and retracted to the original position where the elastomer is interposed around the striatum, and the coating is resumed. The mandrel is moved using, for example, a screw, fluid pressure such as hydraulic pressure, lever, or the like.
[0008]
In this case, since the elastomer material does not intervene between the core metal and the die in a state where the core metal is in contact with the die, it is easy to reset the wire body from the core metal to the die. It may be allowed to escape by overflowing without stopping, and for a short time (for example, about a dozen minutes or more), even if the extruder is stopped, the operation can be resumed after resetting the striatum. , After stopping the extruder and disassembling and cleaning the head part as before, re-setting the striate body, assembling the head part and starting again, the time-consuming and laborious work is not required .
[0009]
The extruder head may be configured so as to cover one linear body with one cored bar and one die hole, in which case a new one as described above. It is possible to easily perform resetting when changing to a wire rod or disconnection, and troublesome work such as disassembly and cleaning becomes unnecessary.
[0010]
Further, the extruder head may include a plurality of core bars so that a plurality of filaments can be coated at the same time. And in that case, each cored bar can be moved individually for each filament , and the movable core can be interrupted by moving to a position where it does not interpose the elastomer material by contacting the die. It is better to use gold, so that when you replace a part (one or more) of the wire rods or connect the disconnection points, move the mandrel individually. During the setting, the extruder does not stop, and it is possible to replace and join the filaments while continuing the coating process of the other filaments.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a side sectional view (a) in a state during coating processing and a side sectional view (b) in a state during stopping coating processing of an extruder head showing an example of an embodiment of the present invention.
[0013]
The extruder head shown in FIG. 1 heats an elastomer material such as rubber or resin to about 90 ° C. with hot water in a hopper, and pressurizes it with a screw pump or the like to about 15 to 20 MPa and pushes it from a nozzle (extruder nozzle). It is attached to the tip of a nozzle of an extruder (not shown) that is to be ejected, and includes a head body 1, a cored bar 2, a cored bar holder 3 and a nut 4 for holding and fixing the cored bar 2, a die 5, and a die It is comprised with the fixed metal fitting 6 which fixes and holds 5. The extruder body is known per se.
[0014]
The head main body 1 has a through hole 7 that penetrates in a direction orthogonal to the axis of an extruder nozzle (not shown). A cored bar holder 3 for holding the cored bar 2 is inserted into the through-hole 7 from one end side, and the cored bar holder 3 is fixed to the head body 1 with a bolt (not shown), and from the other end side is a die. 5 is inserted, a fixing metal fitting 6 is mounted on the outside with the die 5 interposed therebetween, and the fixing metal fitting 6 is fixed to the head body 1 with a bolt (not shown).
[0015]
The head body 1 is tapered so as to communicate with a nozzle hole of an extruder nozzle (not shown) and extends in the nozzle axial direction to reach the through hole 7. An outlet passage 9 that communicates with the through-hole 7 and extends in parallel with the nozzle axis at a position displaced to one axial end side of the through-hole 7 and opens to the outside on the opposite side of the inlet passage 8 is provided.
[0016]
The core metal 2 has a core metal part at the tip having a core hole 11 through which the wire body passes, and a communication hole 12 having a cylindrical shape and an enlarged diameter communicating with the back of the core hole 11 inside, and a screw 13 on the outer periphery. And a mounting portion having a notch-shaped tool gripping portion 14 at the rear end.
[0017]
The cored bar holder 3 includes a holder hole 15 for inserting and holding the cored bar 2 from the outside in a direction orthogonal to the nozzle axis. The holder hole 15 has a distal end portion that slides and holds the cored bar portion of the cored bar 2 in and out of the head main body 1, and a screw 16 is provided on the inner periphery of the base end side so that a screw on the cored bar 2 side is provided. 13 and is configured to hold the core metal 2 movably. The core metal holder 3 is inserted into and fixed to the through hole 7 of the head body 1 from one end side, so that the front end surface (inner end surface) reaches a slightly front position without interfering with the inlet passage 8, and the through hole is at that position. Close one end of 7.
[0018]
In addition, the die 5 includes a die portion at the tip (inner end) having a die hole 17 through which the linear member passing through the core hole 11 of the core metal 2 passes straight forward in the axial direction, and a cylindrical portion connected to the outside thereof. It is integrally formed, and is inserted into and fixed to the through hole 7 of the head body 1 from the other end side, so that the front end surface (inner end surface) reaches a slightly near position where it does not interfere with the inlet passage 8. Then, the other end side of the through hole 7 is closed facing the core metal holder 3.
[0019]
Both ends of the metal core holder 3 and the die 5 are closed, and a space communicating with the inlet passage 8 constitutes an elastomer chamber 18. A groove 19 is formed in the axial direction on the outer periphery of the tip (inner end) of the core metal holder 3 so as to allow the elastomer chamber 18 to communicate with the outlet passage 9.
[0020]
The extruder head according to this embodiment is for coating one wire, and has one hole (core hole 11) in the core metal 2 and one hole (die hole 17) in the die 5. One, and the wire rod fed out from a reel (not shown) is passed from the core metal 2 (core hole 11) to the die 5 (die hole 17) as shown by the arrow in FIG. Then, as shown in FIG. 1 (a), the cored bar 2 is set at a position where a predetermined gap is provided between the die 5 and the elastomer is interposed around the filament, and the nut 4 is tightened and heated. The extruded elastomer material such as rubber or resin is extruded from the extrusion nozzle to the elastomer chamber 18 and is coated around the linear body, and the coated linear body is continuously pulled out through the die 5 (die hole 17), A predetermined finishing diameter is used.
[0021]
The cored bar 2 has a position shown in FIG. 1A, that is, a position where a predetermined gap is provided between the die 5 and an elastomer is interposed around the filament (covering position), and the position shown in FIG. ), That is, a position where the elastomer material is not interposed by contact with the die 5 (coating treatment stop position), and when the reel is replaced after the winding of the wire is completed, the wire breaks. Sometimes, as shown in FIG. 1B, the coating is interrupted by advancing the cored bar 2 to a position where it does not interpose the elastomer material by contacting the die 5. Then, after passing the previous striated body, the new striated body or the remaining disconnected striated body is passed from the core metal 2 (core hole 11) to the die 5 (die hole 17), and the previous striated wire is passed through. After that, the cored bar 2 is moved back to the original position where the elastomer is interposed around the striated body with a predetermined gap between the die 5 as shown in FIG. The coating is resumed. The metal core 2 is moved by loosening the nut 4 and rotating the tool gripping part 14 with a monkey or the like. In addition, the movement of the metal core 2 can also be performed using fluid pressure such as hydraulic pressure, lever, or the like.
[0022]
In the state where the cored bar 2 is in contact with the die 5 as shown in FIG. 1 (b), no elastomer material is interposed between the cored bar 2 and the die 5, so that the filament is moved from the cored bar 2 to the die 5. Re-setting through is easy. In the meantime, the extruder can be reset without opening the cock of the discharge pipe (not shown) connected to the outlet passage 9 and overflowing without stopping the extruder. Moreover, if it is a short time (for example, about 10 or more minutes), even if an extruder is stopped, an elastomer material will not harden | cure, and after resetting a filament, a driving | operation can be restarted as it is.
[0023]
Moreover, the extruder head of this invention can also be comprised so that a coating process can be carried out simultaneously on several linear bodies. FIG. 2 is a cross-sectional view (a) in plan view and a cross-sectional view (b) in side view of an extruder head according to an embodiment in which a plurality of filaments can be coated simultaneously.
[0024]
The extruder head shown in FIG. 2 heats an elastomeric material such as rubber or resin to about 90 ° C. with hot water in a hopper, for example, and pressurizes it to about 15 to 20 MPa with a screw pump or the like from a nozzle (extruder nozzle). It is attached to the tip of a nozzle of an extruder (not shown) adapted to take out, and has a head body 21 that is long in the width direction (up and down direction in FIG. 2A) in plan view, and the head body A plurality of (5 in the illustrated example) cored bars 2 are arranged at predetermined intervals in the width direction 21, and the plurality of cored bars 2 are held by a cored bar holder 23 that is long in the width direction, It is fixed by the nut 4 and also has a die 25 that is long in the width direction, and a fixing fitting 26 that is long in the width direction for holding and fixing the die 25. The extruder body is known per se.
[0025]
The head main body 21 has a through-hole 27 having a wide rectangular cross section that penetrates in a direction orthogonal to the axis of the extruder nozzle (not shown) (the left-right direction in FIG. 2B). And the said metal core holder 23 which hold | maintains the several metal core 2 from one end side is inserted in this through-hole 27, and the metal core holder 23 is fixed to the head main body 21 with the volt | bolt which is not illustrated, and the other end side Then, a die 25 is inserted and fitted, a fixing metal fitting 26 is mounted on the outer side across the die 25, and the fixing metal fitting 26 is fixed to the head main body 21 with a bolt (not shown).
[0026]
Further, the head main body 21 is opened in a taper shape so as to communicate with a nozzle hole of an extruder nozzle (not shown) at the center in the width direction (up and down direction in FIG. 2A) in plan view. The inlet passage 8 extends in the nozzle axis direction and reaches the through-hole 27, and communicates with the through-hole 27 at a position displaced to one end side in the axial direction of the through-hole 27 with respect to the inlet passage 8 and is parallel to the nozzle axis. And an outlet passage 9 that opens to the outside on the opposite side of the inlet passage 8.
[0027]
Each core metal 2 has a core metal part at the tip having a core hole 11 through which the wire body passes, and a communication hole 12 having a cylindrical shape and an enlarged diameter communicating with the back of the core hole 11 inside, and a screw 13 on the outer periphery. And a mounting portion having a notch-shaped tool gripping portion 14 at the rear end.
[0028]
The cored bar holder 23 includes a plurality of (five in the illustrated example) holder holes 15 formed at predetermined intervals so as to insert and hold the cored bar 2 from the outside in a direction orthogonal to the nozzle axis. ing. Each holder hole 15 has a distal end portion that slides and holds the core metal portion of the core metal 2 in the head main body 21 so that it can freely slide in and out, and a screw 16 is provided on the inner periphery on the base end side. 13 and is configured to hold the core metal 2 movably. The core metal holder 23 is inserted into and fixed to the through hole 27 of the head main body 21 from one end side, so that the front end surface (inner end surface) reaches a slightly near position where it does not interfere with the inlet passage 8 in a side view. The one end side of the through hole 27 is closed at the position.
[0029]
The dice 25 includes a plurality (five in the illustrated example) of dice holes 17 formed at predetermined intervals so that the wire rods that have passed through the core holes 11 of the cores 2 pass straight forward in the axial direction. A die portion having a wide tip (inner end) and a wide cylindrical portion connected to the outside thereof are integrally formed and inserted into and fixed to the through hole 27 of the head body 21 from the other end. As a result, the distal end surface (inner end surface) reaches a position slightly in front of the entrance passage 8 in a side view, and the other end side of the through hole 27 is closed facing the cored bar holder 23 at that position.
[0030]
Both ends of the metal core holder 23 and the die 25 are closed, and the space communicating with the inlet passage 8 forms a wide elastomer chamber 28 in the width direction (up and down direction in FIG. 2A) in plan view. To do. A groove 29 is formed in the axial direction on the lower surface of the tip (inner end) of the core bar holder 23 so as to allow the elastomer chamber 28 to communicate with the outlet passage 9.
[0031]
The extruder head according to this embodiment is for covering a plurality of filaments at the same time, and as described above, a plurality (5 in the example shown) each having one core hole 11. The cored bar 2 and the die 25 having the number of die holes 17 corresponding to the number of the cored bar 2 are provided, and the wire rods respectively fed from a plurality of reels (not shown) are each cored bar 2 as shown by an arrow in FIG. The core hole 11 is passed through each die hole 17 of the die 25. Then, as shown in FIG. 2 (b), each cored bar 2 is set at a position where an elastomer is interposed around each linear body with a predetermined gap between the die 25 and the nut 4 is tightened, A heated elastomer material such as rubber or resin is extruded from the extrusion nozzle to the elastomer chamber 28 to cover the periphery of the linear body, and each coated linear body is continuously pulled out through each die hole 17 of the die 25. And a predetermined finishing diameter.
[0032]
(A) of FIG. 2 shows the state in which the coating process is being performed on four of the five filaments and the coating process is being stopped for one (second from the bottom in the figure) filaments. FIG. 2B shows a state during the coating process. Each cored bar 2 has a predetermined gap between the die 25 and a position where the elastomer is interposed around the linear body (covering processing position), and a position where the elastomer material is not touched by contacting the die 5 (covering process). When the reel is exchanged after the wire has been wound for one turn, or when the wire breaks, the corresponding cored bar 2 is moved from the bottom of FIG. Like the second core 2, the coating is interrupted by advancing to a position where the elastomer material is not interposed by contacting the die 5. Then, after passing the previous striated body, a new striated body or the remaining disconnected striated body is passed from the core metal 2 (core hole 11) to the corresponding die hole 17 of the die 25, and the previous wire Then, the coating is resumed by causing the cored bar 2 to revolve to the original position where the elastomer is interposed around the linear body with a predetermined gap between the cored bar 2 and the die 25. The metal core 2 is moved by loosening the nut 4 and rotating the tool gripping part 14 with a monkey or the like. In addition, the movement of the metal core 2 can also be performed using fluid pressure such as hydraulic pressure, lever, or the like.
[0033]
In the state where the metal core 2 is in contact with the die 25 as in the second metal core 2 from the bottom of FIG. 2A, no elastomer material is interposed between the metal core 2 and the die 25. Resetting from 2 to the die 25 is easy. And during that time, the extruder is not stopped, and the other filaments continue the coating process. Note that the number of the striatum to be stopped for coating may be simultaneous (however, part of the whole). In the example of FIG. 2, five core bars 2 are provided, but the number of core bars 2 is not limited to five.
[0034]
【The invention's effect】
As is apparent from the above description, the extruder head according to the present invention is made of an elastomer material in which a core metal is in contact with the die and a position where the elastomer is interposed around the linear member with a predetermined gap between the die and the die. Since the movable cored bar is movable between the position where no wire is interposed, the elastomeric material can be re-set between the cored bar and the die when the linear body is replaced or disconnected. It can be performed without intervening, and the filament can be easily reset without requiring troublesome work such as disassembly and cleaning.
[0035]
The extruder head of the present invention comprises a plurality of cored bars, a plurality of strips can be coated simultaneously, and each cored bar can be moved individually for each strip. By doing this, when replacing a part (one or more) of the plurality of wire rods or connecting the disconnection points, it is possible to individually reset the core bar by moving it. In the meantime, the extruder does not stop, and it is possible to replace and join the filaments while continuing the coating process of the other filaments.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view (a) of an extruder head showing an example of an embodiment of the present invention in a state during a coating process and a side sectional view (b) in a state when a coating process is stopped.
FIG. 2 is a cross-sectional view (a) and a cross-sectional view (b), as viewed from above, of an extruder head showing another example of the embodiment of the present invention.
[Explanation of symbols]
1, 21 Head body 2 Core metal 3, 23 Core metal holder 4 Nut 5, 25 Die 6, 26 Fixing bracket 7, 27 Through hole 8 Inlet passage 9 Outlet passage 11 Core hole 12 Communication hole 13 Screw 14 Tool gripping portion 15 Holder Hole 16 Screw 17 Die hole 18, 28 Elastomer chamber 19 Groove

Claims (2)

An elastomer coating in which a filament is introduced into an elastomer chamber through a metal core, an elastomer material is extruded into the elastomer chamber, the elastomer material is coated around the filament, and the coated filament is pulled out through a die. An extruder head for
The core metal is movable between a position where an elastomer is interposed around a linear body with a predetermined gap between the core and a position where no elastomer material is interposed between the die and the die. An extruder head characterized in that a movable cored bar that can interrupt the coating by moving to a position that does not interpose an elastomeric material in contact with the core. An extruder head for coating an elastomer capable of simultaneously coating a plurality of filaments, wherein the movable cored bar can be moved individually for each filament, and does not interpose an elastomer material in contact with the die. 2. The extruder head according to claim 1 , wherein the coating can be interrupted by moving to a position .

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