JP2019089282A - Method and apparatus for manufacturing rubber coated twisted cord - Google Patents

Abstract

To provide a method and an apparatus for manufacturing a rubber coated twisted cord capable of preventing such a trouble that the coated rubber thickness exceeds to form a rubber lump when an unvulcanized rubber is coated while the twisted cord is intermittently moved.SOLUTION: While an unvulcanized rubber 13 extruded from a rubber extruder 2 is filled into a coating head 4, and excess unvulcanized rubber 13 is flown out from the coating head 4 through a channel 5a as an overflow rubber 13a, a twisted cord 12 moving from a feed-out part 9a to a winding part 10 is passed through the coating head 4 to manufacture a rubber coated twisted cord 11 with the outer circumferential surface of the twisted cord 12 coated with the unvulcanized rubber 13. When the twisted cord 12 is stopped to move, the overflow rubber 13a is flown out through a sub channel 5b in addition to the channel 5a, increasing the cross-section of the overflow channel compared to the case when the twisted cord 12 is moving.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method and an apparatus for producing a rubber-coated stranded wire cord, and more specifically, in covering a non-vulcanized rubber on an outer peripheral surface of the stranded wire cord while intermittently moving the stranded wire cord. The present invention relates to a method and apparatus for producing a rubber-coated stranded wire cord which can prevent the problem of excessive formation of a rubber mass.

  In the process of manufacturing a rubber product such as a tire, a stranded wire cord whose outer peripheral surface is covered with unvulcanized rubber is used. Several methods of coating unvulcanized rubber on a stranded wire cord are known (see, for example, Patent Document 1). In a method using a so-called crosshead type rubber extruder, the outer circumferential surface is obtained by extruding unvulcanized rubber onto a coating head installed in the rubber extruder and passing the stranded wire cord through the coating head. Is coated with unvulcanized rubber. Unvulcanized rubber is always extruded from the rubber extruder, so excess unvulcanized rubber flows out from the coating head through the overflow channel.

  In such an apparatus, the movement of the stranded wire cord may be temporarily stopped due to the convenience of the post-process and the like. Even if the movement of the stranded wire cord is stopped, the rubber extruder continues to extrude the unvulcanized rubber, so that the unvulcanized rubber flows out not only from the overflow channel in the coating head but also from the outlet for passing the stranded wire cord. Do. Along with this, as illustrated in FIG. 12, the unvulcanized rubber 13 that has flowed out adheres in the vicinity of the outlet 4b of the coating head 4 through which the stranded wire cord 12 passes, and becomes a rubber mass 13b. Therefore, when the movement of the stranded wire cord 12 which has been stopped is resumed, the rubber mass 13b attached near the outlet 4b adheres to the outer peripheral surface of the stranded wire cord 12 which has passed through the outlet 4b. As a result, the rubber thickness of the unvulcanized rubber 13 coated on the outer peripheral surface of the stranded wire cord 12 locally becomes excessive. When covering the unvulcanized rubber 3 while moving the stranded wire cords 12 intermittently, there is a problem that the poor quality rubber-coated stranded wire cords 11a are produced in this way.

JP 2012-71462 A

  The object of the present invention is to prevent the problem that the thickness of the coated rubber becomes excessive and the rubber lump is formed when coating the unvulcanized rubber on the outer peripheral surface while moving the stranded wire cord intermittently It is an object of the present invention to provide a method and apparatus for producing a rubber-coated stranded wire cord.

  In order to achieve the above object, according to the method for producing a rubber-coated stranded wire cord of the present invention, an unvulcanized rubber extruded from a rubber extruder is moved by winding the stranded wire cord drawn out from a drawing portion around a winding portion. By passing the stranded wire cord through the coating head while letting the coating head flow the excess unvulcanized rubber from the coating head through the overflow channel while filling the coating head with the coating wire. In the method of manufacturing a rubber-coated stranded wire cord coated with the unvulcanized rubber on the outer peripheral surface to produce a rubber-coated stranded wire cord, when the movement of the stranded wire cord is stopped, To increase the cross-sectional area of the overflow channel.

  The apparatus for producing a rubber-coated stranded wire cord according to the present invention is provided between a delivery portion and a take-up portion of a stranded wire cord, a rubber extruder, and the delivery portion and the take-up portion. And a covering head for covering the twisted wire cord with the extruded unvulcanized rubber, and overflowing the excess unvulcanized rubber from the covering head filled with the unvulcanized rubber. In a manufacturing apparatus of a rubber-coated stranded wire cord having a flow path, the stranded wire cord moving from the delivery portion to the winding portion passes through the covering head, the movement of the stranded wire cord is When stopped, it is characterized in that the cross-sectional area of the overflow channel is increased compared to when moving.

  According to the present invention, the rubber is introduced by passing the stranded wire cord through the coating head which is flowing the excess unvulcanized rubber through the overflow channel while being filled with the unvulcanized rubber extruded from the rubber extruder. When manufacturing the coated stranded wire cord, when the movement of the stranded wire cord is stopped, the cross-sectional area of the overflow channel is increased as compared to when moving the coated head, so that the head pressure of the coating head is increased. It can be reduced. Along with this, it is possible to suppress the unvulcanized rubber from flowing out from the outlet through which the stranded wire cord formed on the coating head passes. Therefore, the unvulcanized rubber becomes lumpy and hardly adheres to the vicinity of the outlet. Therefore, even if the movement of the stranded wire cord is resumed, the thickness of the unvulcanized rubber coated on the outer peripheral surface of the stranded wire cord is advantageously increased to prevent the formation of an excessive rubber thickness and the formation of a rubber lump. Become.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which illustrates the manufacturing apparatus of the rubber-coated stranded wire cord of this invention by a plain view. It is explanatory drawing which illustrates the manufacturing apparatus of FIG. 1 by planar view. It is explanatory drawing which illustrates the rubber extruder of FIG. 1 by a plain view. It is explanatory drawing which illustrates the overflow block of FIG. 3, and its lower part in planar view. It is explanatory drawing which isolate | separates each component illustrated in FIG. 4, and illustrates it in planar view. It is explanatory drawing which illustrates the rubber extruder of FIG. 3 which has coat | covered unvulcanized rubber on the outer peripheral surface of the stranding cord to which it is making it move. It is explanatory drawing which illustrates the rubber extruder of FIG. 3 when the movement of a strand cord is stopped. It is explanatory drawing which illustrates the rubber extruder in another embodiment which coat | covers the non-vulcanized rubber on the outer peripheral surface of the stranding cord to which it is making it move in a plain view. It is explanatory drawing which illustrates the overflow block of FIG. 8, and the component of the lower part in planar view. It is explanatory drawing which illustrates the rubber extruder of FIG. 8 when the movement of a strand wire cord is stopped. It is explanatory drawing which illustrates the non-defective item of a rubber | gum coated strand wire cord. It is explanatory drawing which illustrates the inferior goods of a rubber-coated twisted wire cord.

  Hereinafter, the method and apparatus for producing a rubber-coated stranded wire cord of the present invention will be specifically described based on the embodiment shown in the drawings.

  The apparatus 1 for producing a rubber-coated stranded wire cord according to the present invention (hereinafter referred to as the production apparatus 1) illustrated in FIGS. Although the wire cord 11 is manufactured continuously, the movement of the stranded wire cord 12 may be temporarily stopped at the time of the manufacture. That is, the rubber-coated stranded wire cord 11 is manufactured while intermittently moving the stranded wire cord 12. The stranded wire cord 12 is formed, for example, by twisting a plurality of metal strands 12a.

  The manufacturing apparatus 1 includes a coating unit 9 a and a winding unit 10 of the stranded wire cord 12, a rubber extruder 2, and a coating attached to the rubber extruder 2 and disposed between the feeding unit 9 a and the winding unit 10. And a head 4. The stranded wire cord 12 is continuous from the feeding portion 9 a to the winding portion 10. In this embodiment, the manufacturing apparatus 1 further includes a storage wire portion 9 b that stores the stranded wire cord 12 at a certain length on the upstream side of the coating head 4.

  The feeding portion 9a for feeding the stocked stranded wire cord 12 is composed of, for example, a reel on which the stranded wire cord 12 is wound. The feeding portion 9a has a brake capable of adjusting the tension acting on the stranded wire cord 12 to be fed.

  The winding portion 10 for winding the stranded wire cord 12 whose outer peripheral surface is covered with the unvulcanized rubber 13, ie, the rubber-coated stranded wire cord 11, is constituted by, for example, a reel on which the stranded wire cord 12 is wound. . The winding unit 10 is rotationally driven by a drive motor or the like to move the stranded wire cord 12 fed from the feeding unit 9 a and wind the rubber-coated stranded wire cord 11.

  The rubber extruder 2 extrudes the unvulcanized rubber 13 from the extrusion head 3 at the tip with a substantially constant pressure. The temperature of the unvulcanized rubber 13 is, for example, about 70 ° C to 90 ° C. A box-like coating head 4 is connected to the extrusion head 3.

  As illustrated in FIG. 3, the coating head 4 includes an inlet 4 a and an outlet 4 b through which the moving twisted cord 12 passes, a pressure sensor 4 c that detects the head pressure (internal pressure) of the coating head 4, and a pressure sensor A control unit 8 to which detection data 4c is sequentially input is provided. The inlet 4 a and the outlet 4 b are formed on opposite side surfaces of the coating head 4. The moving speed of the stranded wire cord 12 is also sequentially input to the control unit 8.

  An overflow block 5 is attached to the lower end surface of the coating head 4. As illustrated in FIGS. 3 to 5, the overflow block 5 is formed with a flow passage 5 a and a sub flow passage 5 b which vertically penetrate. In this embodiment, the cross-sectional area of the flow path 5a is set smaller than the cross-sectional area of the sub flow path 5b.

  On the lower end surface of the overflow block 5 in which the flow path 5a and the sub flow path 5b are opened, a blocking block 6 that can slide while being in contact with the lower end surface is installed. The blocking block 6 is slidable by a slide mechanism 6 a such as a hydraulic cylinder. The blocking block 6 is an open / close member that opens and closes the flow path 5a and the sub flow path 5b by moving across the flow path 5a and the sub flow path 5b.

  In this embodiment, there is further provided a pressing block 7 which always presses the blocking block 6 toward the lower end surface of the overflow block 5. The pressing block 7 is movable in a direction approaching or separating from the blocking block 6 by a pressing mechanism 7 b such as a hydraulic cylinder. When the pressing block 7 moves close to and presses the blocking block 6, the blocking block 6 presses the overflow block 5. The holding block 7 is formed with a hole-like or notch-like outflow part 7 a. The presser block 7 can be optionally provided.

  The operations of the slide mechanism 6 a and the pressing mechanism 7 b are controlled by the control unit 8. In this embodiment, the opposing inclined surfaces of the blocking block 6 and the pressing block 7 are in contact with each other, and both can slide relative to each other.

  The unvulcanized rubber 13 extruded from the rubber extruder 2 is filled into the inside of the covering head 4 and temporarily stored in the covering head 4 and thereafter, as described later, the flow path 5a or It flows out to the exterior of the coating head 4 through the passage 5a and the sub flow passage 5b. In this embodiment, the direction in which the unvulcanized rubber 13 is extruded from the rubber extruder 2 and the moving direction of the stranded wire cord 12 are orthogonal to each other, but the angle between the two is not limited to 90 °. It can be set to the angle of

  A heating unit such as a heater capable of heating the passing stranded wire cord 12 to a predetermined temperature may be provided between the storage wire portion 9 b and the coating head 4. The heating wire is used to heat the stranded wire cord 12 so that the temperature of the stranded wire cord 12 approaches the temperature of the unvulcanized rubber 13 extruded by the rubber extruder 2. This heating facilitates adhesion of the unvulcanized rubber 13 to the stranded wire cord 12.

  Next, the procedure of the method for producing the rubber-coated stranded wire cord of the present invention will be described.

  As illustrated in FIGS. 1 and 2, by driving the winding unit 10, the stranded wire cord 12 is pulled out from the unwinding unit 9 a to the winding unit 10 and is moved at a substantially constant speed within a predetermined speed range. Thus, the stranded wire cord 12 passes through the storage wire portion 9 b and the coating head 4 sequentially. A predetermined tension acts on the moving stranded wire cord 12 by the brake of the feeding portion 9a.

  Unvulcanized rubber 13 is extruded from the rubber extruder 2 at a substantially constant pressure and filled in the coating head 4. In this state, as illustrated in FIG. 6, the blocking block 6 closes the sub flow passage 5b and moves it to a position where only the flow passage 5a is opened. A pressing block 7 always applies a pressing force to the lower end face of the overflow block 5 to the blocking block 6.

  In this state, the excess unvulcanized rubber 13 flows out of the covering head 4 as the overflow rubber 13a through the flow path 5a serving as the overflow flow path, and the moving stranded wire cord 12 moves from the inlet 4a to the covering head Enter 4 and exit from exit 4b. Since the outflow part 7a which penetrates the holding block 7 is formed, the overflow rubber 13a can be made to flow out of the covering head 4 smoothly through the outflow part 7a. In this way, the moving stranded wire cord 12 passes through the coating head 4 so that the outer circumferential surface of the stranded wire cord 12 coming out of the outlet 4 b is coated with the unvulcanized rubber 13 of a predetermined thickness, A rubber coated stranded wire cord 11 is manufactured. The overflow rubber 13a having flowed out of the flow path 5a is used again by extruding from the rubber extruder 2 or the like.

  The movement of the stranded wire cord 12 may be temporarily stopped due to the convenience of the next step or the like. At that time, the manufacturing apparatus 1 is controlled as follows. Whether the stranded wire cord 12 is moving or not moving is grasped by the control unit 8 based on the moving speed of the stranded wire cord 12.

  As illustrated in FIG. 7, even when the movement of the stranded wire cord 12 is stopped, the unvulcanized rubber 13 is extruded from the rubber extruder 2 in order to ensure the unvulcanized rubber 13 of the predetermined quality. The coating head 4 continues to be filled. Therefore, in this state, the blocking block 6 is moved to a position where the flow path 5a and the sub flow path 5b are opened. A pressing block 7 always applies a pressing force to the lower end face of the overflow block 5 to the blocking block 6.

  By sliding the blocking block 6 in this manner, excess unvulcanized rubber 13 flows out of the coating head 4 as the overflow rubber 13a through the flow path 5a and the sub flow path 5b which become the overflow flow path. Therefore, even when the movement of the stranded wire cord 12 is stopped, the head pressure of the coating head 4 does not become excessive. Since the outflow portion 7a is formed in the pressing block 7, the overflow rubber 13a can be smoothly discharged to the outside of the covering head 4 through the outflow portion 7a.

  When the movement of the stranded wire cord 12 is resumed, as illustrated in FIG. 6, the blocking block 6 is moved to a position in which the sub flow passage 5b is closed and only the flow passage 5a is opened. A pressing block 7 always applies a pressing force to the lower end face of the overflow block 5 to the blocking block 6. From the covering head 4, the excess unvulcanized rubber 13 flows out as the overflow rubber 13 a through the flow path 5 a serving as the overflow flow path, and the outer circumferential surface of the stranded wire cord 12 passing through the covering head 4 is specified. A thickness of unvulcanized rubber 13 is coated to produce a rubber-coated stranded wire cord 11.

  That is, in the present invention, when the movement of the stranded wire cord 12 is stopped, the cross-sectional area of the overflow flow path (flow path 5a and sub flow path 5b) is moved when the overflow flow path (flow path 5a) is moved. Increase the cross-sectional area of Thus, the head pressure of the coating head 4 can be reduced as compared to the case where the movement of the stranded wire cord 12 is stopped without increasing the cross-sectional area of the overflow flow passage. Accordingly, the unvulcanized rubber 13 filled in the coating head 4 can be prevented from flowing out from the gap between the stranded wire cord 12 and the outlet 4 b.

  Therefore, according to the present invention, as illustrated in FIG. 12, the phenomenon in which the unvulcanized rubber 13 is aggregated and attached in the vicinity of the outlet 4b is less likely to occur. Therefore, even if the movement of the stranded wire cord 12 is resumed, the rubber thickness of the unvulcanized rubber 13 coated on the outer peripheral surface of the stranded wire cord 12 becomes excessive to prevent the formation of the rubber lump 13b. It is advantageous to Therefore, even in the case of moving the stranded wire cord 12 intermittently, as illustrated in FIG. 11, the unvulcanized rubber 13 is coated with a predetermined thickness, and the rubber lump 13b is not formed. The rubber-coated stranded wire cord 11 of good quality can be stably manufactured.

  The head pressure of the coating head 4 may be substantially the same when moving the stranded wire cord 12 and when stopping the movement. Therefore, based on the detection data of the pressure sensor 4c, the size of the cross-sectional area (opening cross-sectional area) of the overflow channel may be adjusted by sliding the shielding block 6.

  As in this embodiment, when a pressing force toward the upstream side of the overflow flow path (flow path 5a, sub flow path 5b) is always applied to the blocking block 6, the lower end surface of the overflow block 5 and the blocking block 6 Unvulcanized rubber 13 can be prevented from entering between the upper end faces. The unvulcanized rubber 13 can be prevented from entering between the lower end surface of the blocking block 6 and the upper end surface of the pressing block 7 as well. This makes it easy to slide the blocking block 6 smoothly against the overflow block 5 for a longer period of time. In addition, the blocking block 6 can be smoothly and smoothly slid with respect to the pressing block 7 for a long time.

  In the state of FIG. 6, the blocking block 6 is pressed by the unvulcanized rubber 13 filled in the sub flow path 5b. Therefore, it is necessary to apply a pressing force exceeding this pressing force to the blocking block 6 by the pressing block 7 and press the blocking block 6 toward the overflow block 5. On the other hand, in the state of FIG. 7, the pressure from the unvulcanized rubber 13 does not act directly on the blocking block 6. Therefore, a pressing force that prevents the unvulcanized rubber 13 from entering between the lower end surface of the overflow block 5 and the upper end surface of the blocking block 6 and between the lower end surface of the blocking block 6 and the upper end surface of the pressing block 7 If you Therefore, in the state of FIG. 7, the pressing force applied to the blocking block 6 by the holding block 7 can be made smaller than that of the state of FIG.

  In this embodiment, a plurality of openable and closable overflow channels including the channel 5a and the sub-channel 5b are provided, and the number of overflow channels opened by the transverse movement of the blocking block 6 is increased. The cross-sectional area of the Other configurations may be employed to increase the cross-sectional area of the overflow channel.

  In the embodiment illustrated in FIGS. 8 and 9, only one flow path 5a is formed in the overflow block 5 as an overflow flow path. By moving the blocking block 6 transversely to the flow path 5a, the flow path 5a opens and closes. And the cross-sectional area (opening cross-sectional area) of the flow path 5a can be made to increase by adjusting the amount of transverse movement of the blocking block 6.

  In this embodiment, when moving the stranded wire cord 12, as shown in FIG. 8, the blocking block 6 is moved to a position where a part of the flow path 5a is closed. A pressing block 7 always applies a pressing force to the lower end face of the overflow block 5 to the blocking block 6.

  In this state, the excess unvulcanized rubber 13 is discharged from the coating head 4 as the overflow rubber 13a through the flow path 5a in which a part is closed, and the stranded wire cord 12 passing through the coating head 4 The outer circumferential surface is coated with an unvulcanized rubber 13 of a predetermined thickness to produce a rubber-coated stranded wire cord 11.

  As illustrated in FIG. 10, when the movement of the stranded wire cord 12 is stopped, the blocking block 6 is moved in the direction to increase the cross-sectional area of the flow path 5a. A pressing block 7 always applies a pressing force to the lower end face of the overflow block 5 to the blocking block 6. In this embodiment, there is an advantage that the cross-sectional area of the flow path 5a can be easily increased or decreased in more detail.

DESCRIPTION OF SYMBOLS 1 Rubber-coated stranded wire cord manufacturing apparatus 2 Rubber extruder 3 Extrusion head 4 Coating head 4a Inlet 4b Outlet 4c Pressure sensor 5 Overflow block 5a Channel 5b Sub channel 6 Blocking block (opening and closing member)
6a Slide mechanism 7 Presser block 7a Outflow part 7b Pressing mechanism 8 Control part 9a Delivery part 9b Storage wire part 10 Take-up part 11 Rubber-coated stranded wire cord (good item)
11a Rubber Coated Twisted Wire Cord (Defective)
12 Stranded cord 13 Unvulcanized rubber 13a Overflow rubber 13b Rubber lump

Claims (10)

The stranded wire cord delivered from the delivery section is moved by being wound around the take-up section, and the unvulcanized rubber extruded from the rubber extruder is filled into the coating head while the excess unapplied portion from the coating head is removed. The unvulcanized rubber is coated on the outer peripheral surface of the stranded wire cord by passing the stranded wire cord through the covering head while the vulcanized rubber is made to flow out through the overflow channel to manufacture a rubber coated stranded wire cord. In the method of producing a rubber-coated stranded wire cord,
A method of manufacturing a rubber-coated stranded wire cord, characterized in that when the movement of the stranded wire cord is stopped, the cross-sectional area of the overflow channel is increased as compared with the movement of the stranded wire cord.   The method for manufacturing a rubber-coated stranded wire cord according to claim 1, wherein the cross-sectional area is increased by providing a plurality of openable and closable overflow channels and increasing the number of the overflow channels which are opened.   The method for manufacturing a rubber-coated stranded wire cord according to claim 1, wherein the overflow channel is opened and closed by moving the opening and closing body transversely to the overflow channel.   The method for manufacturing a rubber-coated stranded wire cord according to claim 1, wherein the cross-sectional area is increased by moving the opening / closing body transversely to the overflow flow passage and adjusting the amount of the transverse movement.   The manufacturing method of the rubber-coated stranded wire cord according to claim 3 or 4 which always gives pushing pressure which goes to the upper stream side of said overflow channel to said opening-and-closing object. The unvulcanized rubber, which is disposed between the feeding portion and the winding portion of the stranded wire cord, the rubber extruder, and the feeding portion and the winding portion, and which is extruded by the rubber extruder is the stranded wire cord. And a coating head for coating
The stranded wire cord which has an overflow flow path for allowing the excess unvulcanized rubber to flow out from the covering head filled with the unvulcanized rubber, and the twisted cord moves from the delivery section to the winding section In a manufacturing apparatus for a rubber-coated stranded wire cord configured to pass through a coating head,
When the movement of the stranded wire cord is stopped, the cross-sectional area of the overflow channel is increased as compared with the movement of the stranded wire cord. .   A configuration in which the cross-sectional area is increased by providing a plurality of overflow channels and opening / closing members for opening / closing the overflow channels and increasing the number of the overflow channels opened by the opening / closing members. The manufacturing apparatus of the rubber-coated stranded wire cord according to claim 6.   The manufacturing apparatus of the rubber-coated stranded wire cord according to claim 7, wherein the overflow passage is opened and closed by moving the opening and closing body transversely to the overflow passage.   The manufacturing of the rubber-coated stranded wire cord according to claim 6, wherein the cross-sectional area is increased by providing an opening / closing body moving transversely to the overflow channel, and adjusting the amount of transverse movement of the opening / closing body. apparatus.   The manufacturing apparatus of the rubber-coated stranded wire cord according to claim 8 or 9, further comprising: a pressing mechanism for always applying a pressing force toward the upstream side of the overflow channel to the opening / closing body.

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