JP2005265055A - Rubber shaped body and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly pressure-resistant rubber shaped body of which flexibility and strength are not changed even if the same is used as a large diameter pressure resistant hose which is bent frequently, and a method for manufacturing the same. <P>SOLUTION: This rubber shaped body consists of unvulcanized rubber composition layer 2 to be a inner rubber layer or consists of the rubber composition layer 2 and a fitting 5 arranged on both sides or one side thereof. A first reinforcement layer 4 which consists of a first reinforcement material 3 covering the rubber composition layer 2 and a second reinforcement layer formed by continuously winding single of multiple second reinforcement material 1 at fixed angles on the first reinforcement layer 4 while turning around at an end part of the rubber composition layer or the fitting 5 with keeping incidence angle θi and reflection angle θo same are included. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rubber molded body, and specifically relates to a rubber molded body having a reinforcing structure such as a flexible tube, a flexible joint, and a rubber hose, and a manufacturing apparatus thereof.

  Conventionally, in flexible pipes, flexible joints, rubber hoses, etc., which are rubber molded bodies made of rubber and fibers, the entire rubber molded body is continuously covered while folding back reinforcing fibers or metal (reinforcing material) at both ends. By doing so, a pressure-proof reinforcement structure is taken.

  At this time, for the structure at the end of the reinforcing material, for example, as illustrated in FIG. 6, when the rubber-coated fiber (cord) is folded back at the end, the cord is wound at an angle close to a right angle with a single line, Some are formed. The cord 61 is used for an application in which deformation due to stress having a component in a direction orthogonal to the axis of the tube occurs, and the cord 61 is an unvulcanized rubber composition layer (an inner rubber layer formed on the mandrel 9). (Hereinafter referred to as “rubber composition layer”) 2 is spirally wound around (see, for example, Patent Document 1).

  Also, for example, when used in a bent state, such as a bending hose, or when a method of use with high bending frequency is adopted, such a reinforcing material is responsible for preventing buckling of the rubber molded body and reinforcing pressure resistance in the circumferential direction. ing. However, when bending is applied, the reinforcing material may break through the reinforcing material cover in an attempt to open to the outside of the hose, and it is necessary to further reinforce the reinforcing material to prevent this. Or it is necessary to reinforce in order to maintain the pitch when the cord is spirally wound (see, for example, Patent Document 2).

As a concrete reinforcing method, in addition to a reinforcing layer (hereinafter referred to as “first reinforcing layer”) made of the above-described reinforcing material (hereinafter referred to as “first reinforcing material”), (1) a bracing cord is opposed 2 Affixed with a certain angle in the direction (hereinafter referred to as “cord crossing angle”). (2) Only one layer of plain weave cord, and vertical cord or horizontal cord is 45 with respect to the axis of rubber molded body (hereinafter referred to as “axis”). Further, a reinforcing material (hereinafter referred to as “second reinforcing material”) is further attached to form a reinforcing layer (hereinafter referred to as “second reinforcing layer”). The method is used.
JP 2003-127202 A Japanese Utility Model Publication 2-37346

  However, there are some improvements that are preferable when the rubber molded body is used as a pressure hose having a large diameter, especially when the bending frequency is high.

  In the method (1), the reaction force against bending is small and advantageous. On the other hand, from the role of the reinforcing material, the two-direction sticking is excessive because it is sufficiently reinforced by the first reinforcing material. On the other hand, when the bending frequency is high in only one direction, there is a problem that the effect is small as pressing of the first reinforcing material.

  In addition, pasting in two directions causes troublesome work / operation. In particular, in the case where the ends and the fittings have protrusions, the winding operation of the interdigital cord requires skill, and uniform winding is very difficult. Furthermore, it has been difficult to control the winding angle and the density of the cords of the cords whose density is determined in advance.

  In addition, in the interdigital structure, the cord crossing angle can be freely set, while the tension of the cord is reduced at both ends, so there is a problem that the pressing at the end surface is reduced. When a wire is used, there is a risk that the hard steel wire will pop out if the press at the end is weak.

  The method (2) is highly effective as a presser for the first reinforcing material, and achieves its purpose with a single layer. On the other hand, there is a problem that the bonding itself becomes difficult because the strength changes on the joint surface of the plain weave and the bonding diameter changes when the end fitting is provided at the end.

  Furthermore, the pressure hose is required to have a small bending, so that the bending reaction force is preferably small, and the cord is preferably attached at an angle larger than 45 °. However, in the case of a plain weave reinforcement, it is difficult to set an angle other than around 45 °, and there is a problem of reducing the bending reaction force.

  Conventionally, both of the above have been used properly depending on the use conditions such as use in a curved state, but since the work becomes complicated, there is a strong demand for one rubber molded body having both functions. It was.

  Accordingly, an object of the present invention is to provide a rubber molded body having a high pressure resistance that does not change in flexibility and strength, and a device for producing the same, even when the bending hose is used as a pressure hose having a large diameter. And In other words, even if the hose diameter changes, the reinforcing material sticking angle does not change, the reinforcing material has an angle intersecting the two directions, and the second reinforcing material is set larger than the intersecting angle of the first reinforcing material. An object of the present invention is to provide a rubber molded body having a high pressure resistance that does not increase a bending reaction force and a manufacturing apparatus thereof.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above object can be achieved by a rubber molded body and a manufacturing apparatus thereof shown below, and have completed the present invention.

  The present invention relates to a rubber molded body comprising an unvulcanized rubber composition layer serving as an inner rubber layer, or a rubber molded body comprising the rubber composition layer and a fitting provided on both ends or one end thereof, wherein the rubber A first reinforcing layer composed of a first reinforcing material covering the composition layer, and a second reinforcing material composed of a single or several strips with respect to the first reinforcing layer, the end of the rubber composition layer or the The fitting is characterized in that it has a second reinforcing layer formed by continuously wrapping at a constant angle while turning back with the same incident angle and reflection angle.

  That is, the present inventor coats the rubber composition layer under the condition that the bending reaction force is small with the first reinforcing material in the relationship between the rubber composition layer and the first reinforcing layer, and one or several second reinforcing layers. By wrapping the entire first reinforcing layer at a fixed angle with respect to the axis, the reinforcing structure that has a small bending reaction force even in a state where the rubber molded body is bent and that can sufficiently hold down the first reinforcing material. It has been found that it can be formed, and an excellent rubber molded body having high functionality can be provided. At the same time, in the winding of the second reinforcing material around the covering including the rubber composition layer and the first reinforcing layer, the incident angle and the reflection angle of the second reinforcing material are adjusted via the end of the rubber molded body or the fitting. By folding back equally, the ends of both ends or one end or the end fitting and the reinforcing layer can be firmly fastened. Thus, by winding the second reinforcing material, a pressure-resistant reinforcing layer (second reinforcing layer) reinforced with respect to the entire rubber molded body can be formed and firmly fastened to the end of the rubber molded body. Since the second reinforcing layer can be formed, flexibility and strength can be maintained even in use with high bending frequency, and a rubber molded body with high pressure resistance can be provided.

  The present invention provides the rubber molded body, wherein the second reinforcing layer controls the rotation direction of the mandrel and the reciprocating speed in the axial direction of the rubber molded body while setting the rotation direction of the mandrel to one direction. Then, the second reinforcing material is wound around the first reinforcing layer at a constant winding angle.

  In other words, with the mandrel rotating direction always kept in one direction, the mandrel rotation speed and the mandrel axial movement speed are adjusted to form an angle with a small bending reaction force with respect to the axis. Or several 2nd reinforcement can be wound. In addition, at the end of the rubber molded body, the mandrel rotation direction is left as it is, and the mandrel moving direction is reversed, whereby the second reinforcing material is passed through the end fitting of the covering body or the fitting provided at the end. Thus, folding can be performed by making the incident angle and the reflection angle equal. In this way, by controlling the rotation speed and reciprocating speed of the mandrel, it is possible to simultaneously form a pressure-proof reinforcing layer in two directions reinforced at opposing angles, and to connect the end portion or the fitting to the reinforcing member. The winding angle of the 2nd reinforcement which makes it possible to form the edge part which fastens a layer firmly is securable. Therefore, by forming such a second reinforcing layer, it is possible to provide a rubber molded body having a small bending reaction force and high pressure resistance.

  The present invention is the rubber molded body, wherein the second reinforcing material is a fiber covered with rubber.

  That is, when a synthetic fiber or an inorganic fiber is used as the reinforcing fiber and the surface thereof is covered with rubber and wound, slippage between the objects to be wound can be prevented. In addition, by forming the second reinforcing layer with a fibrous body, it is possible to press the first reinforcing layer with elasticity, reduce the influence on the bending reaction force of the first reinforcing layer, and reduce the influence of each member constituting the rubber molded body. The characteristics can be utilized effectively.

  The present invention is an apparatus for producing a rubber molded body comprising an unvulcanized rubber composition layer as an inner rubber layer, or a rubber molded body comprising the rubber composition layer and a metal fitting provided at both ends or one end thereof. The rubber composition layer is covered with a first reinforcing material to form a first reinforcing layer, the mandrel rotating direction is set as one direction, the mandrel rotating speed and the reciprocating speed in the axial direction of the rubber molded body By controlling the angle, the winding angle of the second reinforcing material consisting of a single or several lines around the first reinforcing layer is made constant, and is incident on the end of the rubber composition layer or the fitting. It is characterized in that it is wound continuously at a constant angle while turning back with the same angle and reflection angle.

  As described above, the first reinforcing material covers the rubber composition layer under the condition that the bending reaction force is small, and one or several second reinforcing materials have a small bending reaction force and sufficient first force. By forming a reinforcing structure that can hold down the reinforcing material, a rubber molded body with high pressure resistance that can maintain flexibility and strength can be obtained. In the production of such a rubber molded body, the present invention provides a first reinforcing member having a certain angle with respect to the axis of the second reinforcing member when the second reinforcing member is wound around the covering including the rubber composition layer and the first reinforcing layer. Wrapping around the entire layer and at the same time using the fact that the second reinforcing material is folded back with the same angle of incidence and reflection through the end of the rubber molded body or the fitting, it is an excellent production method. An apparatus for producing a rubber molded body is provided.

  Specifically, with the mandrel rotation direction always kept in one direction, the mandrel rotation speed and the mandrel axial movement speed are adjusted to form an angle with less bending reaction force with respect to the axis. One or several second reinforcing members can be wound. In addition, at the end of the rubber molded body, the mandrel rotation direction is left as it is, and the mandrel moving direction is reversed, whereby the second reinforcing material is passed through the end fitting of the covering body or the fitting provided at the end. Thus, folding can be performed by making the incident angle and the reflection angle equal. In this way, by controlling the rotation speed and reciprocating speed of the mandrel, it is possible to simultaneously form a pressure-proof reinforcing layer in two directions reinforced at opposing angles, and to connect the end portion or the fitting to the reinforcing member. It is possible to provide an apparatus for producing a rubber molded body that can form an end portion for firmly fastening the layer.

  The present invention is an apparatus for producing the rubber molded body, wherein the second reinforcing material is a fiber covered with rubber, and the rubber is coated on the fiber and simultaneously wrapped around the first reinforcing layer. It is characterized by that.

  In other words, when synthetic fiber or inorganic fiber is used as the reinforcing fiber and the surface is covered with rubber and wound, it can prevent slipping between the objects to be wound, while the strength is reduced due to the hygroscopicity of the rubber or the like. There is a limit to the standing time of the rubber-coated fiber due to the possibility of a decrease in the covering ability. In the present invention, such a possibility can be prevented beforehand by winding the first reinforcing layer simultaneously with the extrusion coating. Further, the rubber can be formed quickly and reliably.

  As described above, in the present invention, by forming the second reinforcing layer in which the second reinforcing material is wound around the first reinforcing layer, the bending reaction force is small even when the rubber molded body is bent, and A reinforcing structure capable of sufficiently pressing the first reinforcing layer can be formed. As a result, an excellent rubber molded body having high functionality can be provided. Further, by devising and controlling the operation of the mandrel, it is possible to provide an apparatus for producing a rubber molded body that reveals such an excellent winding method. Furthermore, in the production of a rubber molded body having a fitting, it is possible to easily fasten it with a complicated fitting that requires skill.

  Specifically, compared with the plain weave, it is possible to increase the bending of the rubber molded body and to sufficiently follow the elongation associated therewith. Even if the processed surface has a protrusion or a different diameter portion, it can be wound in accordance with its shape. Further, there is an advantage that the winding tension can be adjusted.

  Even in comparison with the blind case, the same and large tension can be maintained over the entire length of the rubber molded body. In terms of workability, it can be completed with a single operation, eliminating the intermittent nature of the operation and eliminating the need for special skills.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 illustrates a rubber molded body according to the present invention. FIG. 1 shows a form in which a second reinforcing material 1 is continuously wound around a first reinforcing layer 4 composed of a rubber composition layer 2 and a first reinforcing material 3 coated on the surface thereof. Thus, even if the second reinforcing material 1 is a rubber molded body having a large diameter due to the structure in which the rubber composition layer 2, the fitting 5 and the first reinforcing layer 4 are continuously connected, excellent pressure resistance characteristics are obtained. Secured. In addition, here, the unit in which the main reinforcing cord 6 is laminated on the rubber composition layer 2 along the axis X is illustrated in advance, and the method of winding the first reinforcing member 3 around the surface is illustrated as an example. The present invention can be applied even when the reinforcing cord 6 is not required. The main reinforcing cord 6 is used particularly when the pressure of the internal fluid of the rubber molded body during use is very high, and in combination with the first reinforcing material 3, enhances the pressure resistance capacity of the rubber molded body. In addition, it is also possible to immerse the main reinforcing cord 6 in the rubber composition layer 2 to form an integrated unit.

  Here, although the form (1st structural example) in the rubber molded object which has arrange | positioned the metal fitting 5 which has the projection part 7 in both ends or one end is shown, this invention is a flat rubber molded object which does not have the projection part 7. (Second configuration example) Or a rubber molded body (third configuration example) having an inclined end portion is also applicable.

<Center of rubber molding>
The first reinforcing member 3 is wound around the rubber composition layer 2 in one layer or several layers at a certain angle φ with respect to the axis. Thereby, the primary reinforcement of the rubber composition layer 2 can be performed and the fluid pressure inside the rubber molded body during use can be withstood. In particular, by increasing the winding angle, the bending stress generated when the rubber molded body is bent can be minimized, and in FIG. 1, the winding is performed in a spiral manner at an angle exceeding 80 °. Further, in this example, the intermediate rubber 8 is disposed between the windings of the first reinforcing member 3 to form the first reinforcing layer 4.

  In the present invention, furthermore, by winding one or several second reinforcing members 1 around the first reinforcing layer 4 at a predetermined angle θ, (1) the second reinforcing member 1 itself exerts a bending reaction force. (2) The first reinforcing member 3 can be pressed evenly, the wire rod can be prevented from jumping out and spreading between the windings, and secondary reinforcement of the rubber composition layer 2 can be performed. Can withstand the fluid pressure inside the rubber molded body. At the same time, since the first reinforcing layer 4 does not stretch, contact wear between the first reinforcing layer 4 and the second reinforcing material 1 is less likely to occur. At this time, since the first reinforcing member 3 requires a relatively strong reinforcing function, it is preferable that the first reinforcing member 3 is a rigid reinforcing member made of a single or several strips, and the second reinforcing member 1 is an auxiliary member. In view of the role as a reinforcing function, it is preferably an elastic reinforcing material composed of a single or several strips.

  Moreover, when winding so that the 1st reinforcement layer 4 whole may be covered, there exists a possibility of (1) duplication of adjacent wire materials, (2) nonuniformity of the winding space | interval in the projection part 7 or the inclination part 5b, etc. . By using a single or several reinforcing members as the second reinforcing member 1, such a possibility can be effectively prevented. Moreover, uniform reinforcement can be performed by winding at substantially equal intervals, and pressure resistance can be further improved.

  As the winding angle θ, an angle other than 0 ° or 90 ° can be arbitrarily selected, but 50-60 ° is preferable as the inventor's knowledge, and FIG. 1 illustrates the case of 55 °.

  Moreover, the winding density of the 2nd reinforcement 1 is enough to hold down the 1st reinforcement layer 4, and can be arbitrarily set by a use.

<Rubber molded end>
In wrapping the second reinforcing material 1 around the covering including the rubber composition layer 2 and the first reinforcing layer 4, the second reinforcing material 1 is reflected by the incident angle θi through the end of the rubber molded body or the fitting 5. The angle θo is made equal and folded, and the both ends or one end of the fitting 5 and the reinforcing layer 4 are fastened.

  Normally, the pressure fitting hose requires the cap 5 and has the opening 5a, the inclined portion 5b, the flat portion 5c, and the protrusion 7, so that the protrusion 7 is used as illustrated in FIG. (2) By folding the reinforcing material 1 at the flat portion 5c, the fastening at the end portion can be made stronger. The same effect can be obtained even if there is a groove in the metal fitting 5 as well as the protruding portion 7. However, in the case of the groove, the second reinforcing member 1 tends to converge and become a dango state when folded back. Folding through 7 is stable.

  Moreover, when using the metal fitting 5, the adhesiveness of both is improved by inserting the rubber composition layer 2 in the inclined part 5b by using the projection part 7 as a stop part. In particular, the inclined portion 5b is wound at a certain angle, whereby a high-density reinforcing layer can be formed in the entire one layer around which the second reinforcing material 1 is wound, and strong reinforcement can be performed. The work which raises the reinforcement effect as a whole 5b can be produced.

  When the second reinforcing material 1 itself is covered with rubber, the folded portion is joined in a state of being in close contact with the flat portion 5c due to the hardening of the rubber, and thus there is no fear of peeling. Even when the second reinforcing material 1 itself is not covered with rubber, the rubber composition layer 2 is bonded in a state of being in close contact with the flat portion 5c when the rubber composition layer 2 is cured.

  In addition, in FIG. 1, although the form in the rubber molded object which has arrange | positioned the metal fitting 5 which has the projection part 7 in both ends or one end was illustrated, it is not limited to the shape of an edge part regarding application of this invention. Even in various shapes such as the flat shape (FIG. 2) exemplified as the two configuration examples, the inclined shape (FIG. 3) exemplified in the third configuration example, or the cross-sectional convex shape (FIG. 4), the fastening at the end is strong. The intended technical effect can be obtained.

  FIG. 2A illustrates a form (second configuration example) in a flat rubber molded body having no protrusions. Even in the case of a rubber molded body having no protrusion, at the end portion, a step formed between the rubber composition layer 2 and the coated first reinforcing layer 4 is used, and the second reinforcing material 1 is placed under the step. By folding back at the end portion of the rubber composition layer 2, the fastening at the end portion can be made stronger.

  That is, in the second configuration example, the second reinforcing material composed of a single or several strips has an incident angle θi and a reflection angle θo at the planar portion B of the rubber composition layer 2 through the end surface A of the first reinforcing layer 4. Equally folded. Such a form is not different from the form in the rubber molded body in which the metal fitting 5 having the protrusions is provided, and the same technical effect can be obtained.

  At this time, the present invention can also be applied to a flat rubber molded body having no fitting 5, and its form is illustrated in FIG. In the case where a strong molded body is formed by the main reinforcing cord 6 and the first reinforcing layer 4, as described above, the second reinforcing layer 6 is folded back through the end surface A of the first reinforcing layer 4 or the end surface of the main reinforcing cord 6. The technical effect close to the configuration example can be obtained. Furthermore, since the completed rubber molding has a very flexible end portion, it can be a rubber molding having high pressure resistance that easily fits a wide variety of joints.

  In addition, it does not use the level | step difference of the 1st reinforcement layer 4 and the rubber composition layer 2, but uses the level | step difference of the 1st reinforcement layer 4 and the metal fitting 5, or the level difference of the rubber composition layer 2 and the metal fitting 5 for fastening. It is also possible to obtain the same technical effect.

  As a third configuration example, an embodiment of the present invention in a rubber molded body having an inclined end portion is illustrated in FIG. The second reinforcing material consisting of a single or several strips is folded back at the inclined portion C of the rubber composition layer 2 through the end face A of the first reinforcing layer 4 with the same incident angle θi and reflection angle θo. The entire inclined portion can obtain the same technical effect as the configuration of the inclined portion 5b of the fitting 5 in the first configuration example, and the inclined portion C is similar to the configuration in the plane portion B in the second configuration example. The technical effect can be obtained. The present invention can also be applied to a rubber molded body having an inclined end portion and not having the fitting 5 as described above.

  Furthermore, even when the end portion of the rubber molded body has a convex cross-sectional shape illustrated in FIG. 4, the same technical effect as that of the second configuration example can be obtained, and the present invention can be applied to various forms. is there. Also, the present invention can be applied to a rubber molded body having an end portion having a convex cross section and not having the fitting 5 as described above.

  Next, the operation of the rubber molded body manufacturing apparatus, that is, the manufacturing method, the first reinforcing layer forming step, and the second reinforcing layer forming step will be described in detail with reference to FIGS.

<Formation of first reinforcing layer>
(1) As shown in FIG. 5, the mandrel 9 is inserted into the rubber composition layer 2 and the fitting 5 and set in a first reinforcing material winding device (not shown). At this time, the rubber composition layer 2 is inserted into the inclined portion 5b of the cap 5 and the rubber composition layer 2, the cap 5 and the mandrel 9 form one unit.

  (2) When a first reinforcing material guide (not shown) is fixed at a predetermined position of the first reinforcing material winding device and the first reinforcing material 3 is pushed out from the guide while rotating and moving the mandrel 9, a rubber composition A spiral first reinforcing material is wound around the unit including the physical layer 2. Of course, it is also possible to manufacture using the apparatus which makes this guide movable, or the apparatus which controls both to be movable. FIG. 5 illustrates a method in which a unit in which the main reinforcing cord 6 is laminated along the axis X on the rubber composition layer 2 is prepared in advance, and the first reinforcing member 3 is wound around the unit. The main reinforcing cord 6 is used particularly when the pressure of the internal fluid of the rubber molded body during use is very high, and in combination with the first reinforcing material 3, enhances the pressure resistance capability of the rubber molded body. In addition, it is also possible to immerse the main reinforcing cord 6 in the rubber composition layer 2 to form an integrated unit.

  (3) While rotating the mandrel 9 as shown by the arrow R in FIG. 5, the first reinforcing material 3 is wound up to the end of the rubber composition layer 2 or the protrusion 7 of the fitting 5. At this time, by moving the mandrel 9 to the left and right as indicated by an arrow X in the figure, the first reinforcing member 3 can spirally wind the rubber composition layer 2 at a predetermined angle. The density and angle of the first reinforcing member 3 can be freely set by adjusting the rotation of the mandrel 9 and the lateral movement speed. If the relationship between the rotational speed of the mandrel 9 and the lateral movement speed is constant, the first reinforcing member 3 The covering angle φ of 3 is constant.

  (4) The rubber composition layer 2 is wound around the first reinforcing member 3 while moving the mandrel 9 in the Xa direction of FIG. At the end portion, the wire is wound up to the protruding portion 7 via the inclined portion 5b of the fitting 5.

  (5) Next, the intermediate rubber 8 is covered while moving the mandrel 9 in the Xa direction again so as to be adjacent to the wound first reinforcing material 3. In this way, it is possible to form the first reinforcing material layers 4 spread almost at equal intervals.

<Formation of second reinforcing layer>
(1) The mandrel 9 is inserted into the rubber-formed body on which the first reinforcing material layer 4 is formed, and set in a second reinforcing material 1 winding device (not shown). In the case of the same device as the first reinforcing member 3 winding device, the first reinforcing member 3 can be operated continuously.

  (2) The second reinforcing material guide 10 is fixed at a predetermined position of the winding device. Here, the description will be made on the assumption that the guide 10 is fixed and the mandrel 9 can be moved. However, as described above, the guide 10 can be moved, or the apparatus can be manufactured using a device that controls both to be movable. Is possible.

  (3) While rotating the mandrel 9 as shown by the arrow R in FIG. 2, the second reinforcing material 1 covered with unvulcanized rubber is wound around the rubber composition layer 2 through the guide 10 by an extruder (not shown). . Although the winding start position is not specified, the second reinforcing material 1 is more likely to be in close contact with the rubber composition layer 2 in the heated state immediately after extrusion.

  The second reinforcing material 1 is preferably a rubber-coated fiber, and it is preferable to perform rubber extrusion coating on the fiber and wrapping around the first reinforcing layer 4 at the same time. For one, when synthetic fibers or inorganic fibers are used as reinforcing fibers and the surface thereof is covered with rubber and wound, slippage between the objects to be wound can be prevented. In addition, there is a limitation in the standing time of the rubber-coated fiber due to the possibility of a decrease in strength due to the hygroscopic property of the rubber or a decrease in the covering ability. In the present invention, the winding around the first reinforcing layer is performed simultaneously with the extrusion coating. By doing so, this possibility can be prevented.

  At this time, the second reinforcing member 1 can wind the rubber composition layer 2 at a predetermined angle by moving the mandrel 9 left and right as indicated by the arrow Xa or Xb in FIG. The density and angle of the second reinforcing material 1 can be freely set by adjusting the rotation of the mandrel 9 and the lateral movement speed. If the relationship between the rotational speed of the mandrel 9 and the lateral movement speed is constant, the second reinforcing material 1 The winding angle θ of 1 is constant. FIG. 2 illustrates the case of 55 °.

  (4) The rubber composition layer 2 is wound by the second reinforcing material 1 while moving the mandrel 9 in the Xa direction of FIG. At the end, the protrusion 7 is wound at an incident angle θi via the inclined portion 5b of the fitting 5. Although the mandrel 9 moves to the left and right, the entire length of the winding is the moving distance.

  (5) When the second reinforcing material 1 hits the flat portion 5c, the movement of the mandrel 9 is stopped, and then the mandrel 9 is folded back in the Xb direction in FIG. 2 and moved in the Xa direction. At this time, the second reinforcing material 1 is folded back at the flat portion 5c, and the rubber composition layer 2 is wound around the projection portion 5 and the inclined portion 5b at the reflection angle θo. That is, the second reinforcing member 1 is wound at a certain angle, and when the movement of the mandrel 9 is reversed after passing through the protrusion 7 of the fitting 5, the second reinforcing member 1 is wound at a reflection angle opposite to the incident angle. It is done.

  At this time, the second reinforcing member 1 has sufficient protrusions 7 and catches and cannot be detached by physical force. When the movement of the mandrel 9 is converted in the reverse direction by the protrusion 7, the catching length of the protrusion 7 can be adjusted by temporarily providing a time difference. This operation is possible even when the second reinforcing member 1 is not a single strip but several strips, but when there are multiple strips, it is difficult for the protrusions 7 to be caught uniformly.

  (6) Next, the rubber composition layer 2 is wound around the second reinforcing material 1 while moving the mandrel 9 in the Xa direction again so as to be adjacent to the wound second reinforcing material 1. By repeating (4) and (5) in this way, it becomes possible to form a layer of the second reinforcing material 1 spread almost at equal intervals. In particular, by setting the incident angle θi and the reflection angle θo to substantially the same angle as the winding angle θ, a uniform layer of the second reinforcing material 1 can be formed. However, although the winding density in the protrusion 7 is slightly sparse compared to other portions, this portion is a portion where bending does not occur and does not cause any problem.

  (7) When the metal fittings 5 are provided at both ends, the same operations as in the above (4) to (6) are repeated with the metal fitting 5 on the opposite side. With such a configuration, the exposed end portions of the reinforcing material are only the first and last portions, and hundreds of cord ends are not exposed unlike the conventional case. As a result, it is possible to reduce the number of bonding defects and greatly reduce the risk of moisture intrusion.

  (8) Next, a plurality of reinforcing layers by the second reinforcing material 1 can be formed by repeating the above (4) to (7) so as to cross the wound second reinforcing material 1 layer. it can.

  (9) The rubber molded body thus formed is used as the next step to vulcanize the unvulcanized rubber composition layer 2, the first reinforcing layer 4 or the second reinforcing material 1 by heating or ultraviolet irradiation. As a result, a pressure-resistant rubber molded body in which the reinforcing layer is fixed is completed.

  In the production of the rubber molded body, the second reinforcing member 1 is preferably wound in a state of being covered with unvulcanized rubber. The rubber composition layer 2 or the first reinforcing material layer 4 can be easily joined and fixed, and the adhesion to the metal fitting 5 or the like is high, so that a reinforcing layer having excellent stability can be formed.

  Further, when the blind is prepared in advance in the conventional method, hundreds of bobbins are required, but in the present invention, one or several bobbins are possible. That is, the winding time is short to wind several hundreds of blinds, but it takes a lot of labor and cost to prepare the material. However, in the present invention, the winding time is single or several. Although slightly longer, it is particularly suitable for relatively small production because the turnaround and preparation time are significantly reduced. Moreover, since the winding is performed in units of one or several, there is little material loss.

  In the production of the rubber molded body of the present invention, as the rubber composition layer 2, a rubber composition known in the field of a flexible tube, a rubber hose and the like is appropriately selected and used according to the intended use. The inner rubber layer constituting rubber and the outer rubber layer constituting rubber may be the same rubber material or different rubber materials. In flexible tubes, flexible joints, and rubber hoses, usually, rubber having excellent durability is used for the outer layer, and a rubber material having characteristics corresponding to the fluid passing through the inner layer is used for the inner layer. A thermoplastic resin tube such as a polytetrafluoroethylene tube or a polyethylene terephthalate tube, a thermoplastic elastomer, a stainless corrugated tube, or the like may be used for the contact surface with the fluid.

  Moreover, it is also a suitable aspect that the connection part, such as a flange, is provided for the fitting 5 as necessary.

  The 2nd reinforcement material 1 can use the well-known fiber used as a reinforcement fiber without limitation. Specific examples include polyester fibers such as polyethylene terephthalate and polyethylene naphthalate, polyamide fibers such as nylon 6 and nylon 66, organic fibers such as high-strength fibers such as aramid fibers, steel cords, glass fibers, and carbon fibers. .

  Among these, high-rigidity fibers such as steel cords, glass fibers, and carbon fibers are difficult to reduce the radius of curvature when folded at the ends, and are used in consideration of such characteristics. For example, when forming a fold having a small radius of curvature, it is preferable to use an organic fiber, and when the radius of curvature is large, a steel cord can also be used.

  The fiber may be a monofilament or a multifilament, but it is preferable to use a multifilament yarn as the second reinforcing material 1 from the viewpoint of excellent strength and flexibility.

  The fiber used as the second reinforcing member 1 is preferably subjected to a treatment for improving the adhesiveness in advance if necessary. For example, a resin treatment such as a phenol resin treatment is applied to a polyester fiber or a polyamide fiber. In addition, the glass fiber is exemplified by a coupling agent treatment such as a silane coupling agent and a titanium coupling agent, and the steel cord is exemplified by brass plating.

  As the rubber for coating, natural rubber or synthetic rubber can be used regardless of whether this rubber is sufficiently cut by the extrusion pressure into the fiber layer and does not easily separate even in an unvulcanized state. .

  A known reinforcing material such as a steel ring or a coiled reinforcing metal fitting may be used for the outer layer of the produced rubber molded body, if necessary. The outermost layer is a reinforcing woven fabric layer for preventing wear. May be provided.

  As shown in FIG. 5, the mandrel 9 is provided with a fitting 11 at both ends, and the fitting 11 is joined by an internal rubber. In the present invention, the mandrel 9 can rotate only in either the forward direction or the reverse direction, and can move the shaft (move left and right) repeatedly left and right.

  Hereinafter, the present invention will be further described with reference to specific examples. Needless to say, the present invention is not limited to such examples and comparative examples.

  On the mandrel having an outer diameter of φ114, fittings are arranged at both ends between 3 m, an inner rubber and a main reinforcing cord are laminated, and a first reinforcing material and an intermediate rubber are wound. A first reinforcing layer covering the first reinforcing material is formed over the entire length of the stacked layers, and at the end portion, the protrusion is φ172, the fitting is φ127, and the general portion is φ144.

  Now, the second reinforcing member started to be wound from the end portion φ127 is supplied in a state of being covered with rubber from the fixed guide.

  The mandrel rotates and simultaneously moves to the right, thereby stacking at an angle of 54 ° with respect to the axis. Since the movement of the mandrel is converted to the left at the right end and the mandrel is still rotating, it is now arranged with the angle facing the previous one so as to wind the step of the projection of the fitting. The same is repeated at the left end, and the entire first reinforcing member is wound until it is covered with the second reinforcing member in two directions.

  In the example, the winding angle was 55 °, which was larger than the angle of the main reinforcement cord.

  As the second reinforcing material, a nylon cord having a wire diameter of φ0.7 mm and a rubber covered with φ1.2 mm was used. The winding pitch was set so that the gap was 0.5 mm.

<Examples and Comparative Examples>
The configuration of the second reinforcing material was the same for the three members, and the present invention product and the conventional product were examined for the “blade 2-layer” product and the “plain weave” product. Since the embodiment is automatically performed, only the setting man-hours at the beginning and end are provided.

表１に示すように、実施例について曲げ反力が非常に小さいとの結果が得られた。比較例１（すだれ２層）については、突起部での拡径により巻き付け角度が大きくなるという問題が発生した。比較例２（平織り）については、例えば４５°の場合であっても一方の角度が大きくなると他方の角度は小さくなり、突起部など拡径部には第１補強層全体を覆うことができなかった。

As shown in Table 1, the result that the bending reaction force was very small about the Example was obtained. As for Comparative Example 1 (two tinned layers), there was a problem that the winding angle was increased due to the diameter expansion at the protrusion. For Comparative Example 2 (plain weave), for example, even when the angle is 45 °, if one angle increases, the other angle decreases, and the enlarged portion such as the protrusion cannot cover the entire first reinforcing layer. It was.

  In the above, the application of the present invention to the rubber molded body in which the metal fittings having the protrusions are arranged at both ends or one end has been described, but the same technical idea is not only the metal fittings but also the connecting member when connecting the rubber molded bodies to each other. The present invention can also be applied to a case where another member is disposed at both ends or one end of the rubber molded body, and can be applied to a wide range of uses.

Explanatory drawing which shows the 1st structural example of the rubber molding which concerns on this invention. Explanatory drawing which shows the 2nd structural example of the rubber molding which concerns on this invention. Explanatory drawing which shows the 3rd structural example of the rubber molding which concerns on this invention. Explanatory drawing which shows the 4th structural example of the rubber molding which concerns on this invention. Half sectional view for explaining a method for producing a rubber molded body according to the present invention Explanatory drawing which illustrates the winding method of the reinforcing material of the rubber molding which concerns on a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 2nd reinforcement material 2 Rubber composition layer 3 1st reinforcement material 4 1st reinforcement layer 5 End fitting 6 Main reinforcement cord 7 Protrusion part 8 Intermediate rubber 9 Mandrel 10 Guide

Claims (5)

  A rubber molded body composed of an unvulcanized rubber composition layer serving as an inner rubber layer, or a rubber molded body composed of the rubber composition layer and a fitting provided at both ends or one end thereof, wherein the rubber composition layer is The first reinforcing layer made of the first reinforcing material to be coated and the second reinforcing material made of a single or several strips are incident on the end of the rubber composition layer or the fittings with respect to the first reinforcing layer. A rubber molded body comprising a second reinforcing layer formed by continuously winding at a constant angle while turning back with equal angles and reflection angles.   In the rubber molded body, the second reinforcing layer controls the rotation speed of the mandrel and the reciprocating speed in the axial direction of the rubber molded body so that the rotation direction of the mandrel is one direction. The rubber molded body according to claim 1, wherein the second reinforcing material is wound around one reinforcing layer at a constant winding angle.   The rubber molded body according to claim 1, wherein the second molded body is a rubber-coated fiber.   An apparatus for producing a rubber molded body comprising an unvulcanized rubber composition layer serving as an inner rubber layer, or a rubber molded body comprising the rubber composition layer and a fitting provided at both ends or one end thereof. The first reinforcing layer is formed by covering the physical layer with the first reinforcing material, and the rotation direction of the mandrel is set as one direction, and the rotational speed of the mandrel and the reciprocating speed in the axial direction of the rubber molded body are controlled. The second reinforcing material consisting of a single or several strips is formed with a constant winding angle around the first reinforcing layer, and the incident angle and the reflection angle at the end of the rubber composition layer or the fitting. An apparatus for producing a rubber molded body, which is wound continuously at a constant angle while being folded back with equality. The apparatus for producing a rubber molded body, wherein the second reinforcing material is a rubber-coated fiber, and the rubber is covered by extrusion coating and wound around the first reinforcing layer at the same time. The apparatus for producing a rubber molded body according to claim 4.

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