JP3908604B2 - Transmission belt molding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission belt molding apparatus, and more specifically, by directly spinning a core wire coated with adhesive rubber on the surface of the cord, the use of adhesive rubber is eliminated during molding, and the rationalization of the molding is achieved. The present invention relates to an apparatus for forming a transmission belt capable of eliminating the disorder of the arrangement of the cords during spinning because the twisted wrinkles of the cords are eliminated by covering the surface with an adhesive rubber.
[0002]
[Prior art]
A transmission belt such as a V-belt or a V-ribbed belt is a compression rubber in which a core wire is embedded in an adhesive rubber layer, a cover canvas is laminated on the upper part of the adhesive rubber layer, and a plurality of ribs are provided on the lower part of the adhesive rubber layer. Has a layer. This belt is made of a canvas, an adhesive rubber layer, a cord consisting of cords, and a belt sleeve in which a compression rubber layer is laminated and integrated by vulcanization. When producing a V-ribbed belt, a rib groove is formed on the compression rubber layer by a grinder wheel. It was obtained by grinding.
[0003]
As the core wire of the transmission belt, a cord made of a fiber material such as polyester fiber, aramid fiber, or glass fiber is used. In order to improve the adhesion to rubber material, this cord is RFL treatment only, or pretreated with epoxy or isocyanate compound and then RFL treatment, or after RFL treatment, rubber glue is attached and various adhesion methods are adopted It has been.
[0004]
The cord is usually drawn continuously from the creel while applying a constant tension by a driving roll in a cord dip processing machine, impregnated with an adhesive liquid in a dip tank, and then sent into an oven and dried by heating. After cooling the outside of the oven and finishing the first processing step, the processing steps similar to those of the second, third, and fourth steps are repeatedly passed through, and the impregnation and adhesion of the processing liquid by different blending in each step The film was heated and stretched under different oven temperature conditions and tension conditions, and the belt was wound on a reel with optimum cord physical properties, completing the dip treatment.
[0005]
[Problems to be solved by the invention]
However, in a normal cord dip processing machine, even when the running cord is dipped in rubber paste in which the rubber composition is dissolved in a solvent and overcoated, only a small amount of rubber adheres to the cord. The processed cord remains twisted due to S twist and Z twist, and when the cord is spun onto the forming drum, the cord is biased on the forming drum, the gap between the cords is disturbed, and the belt runout, etc. It may have an effect.
[0006]
For this reason, it has been desired to attach a predetermined amount of rubber to the cord, but such technology has not been completed in the technical field of transmission belt molding apparatus and molding method, but a steel cord band for rubber crawlers. In the field of Japanese Patent Laid-Open No. 8-108496, a steel cord unwound from a spool is passed through a rubber extruder, and the entire surface of the steel cord is coated with rubber in a concentric circle shape. A method of manufacturing a steel cord band for a rubber crawler in which steel cords are sequentially wound around a molding drum set to a predetermined length at a constant pitch and steel cords are arranged in a straight line. However, there is no suggestion about a transmission belt forming apparatus.
[0007]
The present invention addresses this situation in view of the actual situation as described above, and eliminates the need for the use of adhesive rubber at the time of belt molding, streamlining the belt molding, and covering the surface of the cord with adhesive rubber. An object of the present invention is to provide a transmission belt molding apparatus that eliminates twisting wrinkles and can eliminate disturbance in the arrangement of cords during spinning.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is a transmission belt molding apparatus for spinning a cord coated with an adhesive rubber into a cylindrical mold.
Adhesive rubber kneaded and extruded by an extruder is divided into a bypass passage provided in the outer peripheral direction of the die and a straight main passage, and the divided adhesive rubber is joined to a discharge passage so that the adhesive rubber is to flow discharged without staying in the passage, the code at the same time, a rubber coating unit for depositing continuously rubber while moving so as to cross the passage, directly into a cylindrical mold a code covering the rubber A power transmission belt forming apparatus in which a spinning means for winding is directly connected.
[0009]
That is, in this molding apparatus, the adhesive rubber is covered and fixed to the cord, so that it is not necessary to use the adhesive rubber when forming the belt, and the cord coated with the adhesive rubber is directly spun without drying. Since the cord is covered with adhesive rubber, the twisted cords can be eliminated, so that the disturbance of the cord arrangement during spinning can be eliminated. Troubles such as shake and pronunciation can be solved.
[0010]
The invention according to claim 2 of the present application resides in a transmission belt molding apparatus in which the rubber coating apparatus is configured to simultaneously cover and fix the adhesive rubber to the two cords.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic view of a transmission belt molding apparatus according to the present invention, and FIGS. 2 to 4 are sectional views of an apparatus for coating rubber with a cord. FIG. 5 is a schematic view of the manufacturing process of the transmission belt according to the present invention, which corresponds to the drawing seen from the CC direction of FIG. 1, and FIG. 6 shows a cross-sectional view of the core wire.
[0012]
A power transmission belt molding apparatus 70 according to the present invention includes rubber coating means 1 for attaching rubber while moving a cord, and spinning means 80 for winding the rubber-coated cord directly around a cylindrical mold 50. Yes.
[0013]
As shown in FIGS. 2 to 4, the rubber coating means 1 includes an extruder 2, a pair of dies 3 a and 3 b that form the rubber passages of the bypass passage, the main passage, and the discharge passage, and the pair of dies. A cord traveling part 4 provided so as to cross the main passage, a guide member 5 for guiding the cord through the guide hole and guiding it to the main passage, and a rubber coating for covering and fixing the rubber-attached cord through the through passage A mold 6 and an adjusting member 7 for controlling the amount of rubber discharged from the discharge passage are provided.
[0014]
The extruder 2 accommodates an extrusion screw 11 in a cylinder 10, puts an adhesive rubber 12 through a raw material charging port (not shown), kneads and extrudes it by rotation of the extrusion screw 11. Although the temperature of the cylinder 10 is changed according to the rubber type, it is usually adjusted to 40 to 100 ° C., and the rubber is heated to a temperature at which it is easy to be mixed to be thermoplasticized so that it can be easily extruded. In this case, the kneading time is adjusted so that the rubber vulcanization does not proceed.
[0015]
A pair of dies 3a and 3b are fixed to the extruder 2 via an attachment member 14 so that they are united at the center, and a bypass passage 15 provided with kneaded adhesive rubber 12 in the outer peripheral direction of the die, a linear book The rubber passages that flow to the passage 16 and the discharge passage 17 are formed. That is, the adhesive rubber 12 is diverted into a 180 degree clockwise route and a counterclockwise route through the hollow bypass passage 15 provided on the outer peripheral portion of one die 3b, and is merged again and discharged from the discharge passage 17 to the outside. At the same time, it is discharged from the discharge passage 17 to the outside through the straight main passage 16 passing through the center point of one die 3b. The bypass passage 15 is provided because it is necessary to always flow through the rubber passage so that the predetermined amount of the extruded rubber 12 does not stay and solidify in the die 3. On the other hand, the main passage 16 has a wide entrance to make it easier to put rubber. As will be described later, the passage 16 is a portion where the adhesive rubber 12 is coated on the cord 19 that moves in a direction intersecting with the passage. Is constantly flowing.
The attachment member 14 includes a heating means that can adjust the temperature of the die 3 to 60 to 150 ° C.
[0016]
The cord running portion 4 is a space provided in the pair of dies 3a and 3b so as to face the main passage 16. The cord running portion 4 enters the main passage 16 while running the cord 19, and coats the rubber 12. .
[0017]
The guide member 5 is disposed in the cord traveling portion 4 of one die 3 a and guides the cord 19 to the main passage 16 through the guide hole 21. The guide member 5 is provided with two guide holes 21 through which the two cords 12 pass at the center of the stepped disc body, and the positioning pin 22 is fitted into a guide groove 23 provided on the inner wall of the cord running portion 4. Thus, the guide member 5 is accurately set.
[0018]
On the other hand, the rubber-covered mold 6 is disposed in the cord running portion 4 of the other die 3b, and the cord 19 is covered with the adhesive rubber 12 by passing through the through passage 25. That is, the rubber-coated die 6 has a through passage 25 having an opening 26 having a large exit area at the center of the disc body, and is installed on the bottom surface of the die 3b by inserting the cylindrical pressing member 26. At that time, the rubber-covered mold 6 is accurately installed by fitting the positioning pin 27 inserted therein into a guide groove 28 provided on the inner wall of the cord running portion 4.
[0019]
When the guide member 5 and the rubber-covered mold 6 are accurately installed, the cord 19 is linearly formed from the guide hole 21 to the main passage 16, the guide hole provided in the bottom surface of the die 3b, the through passage 25, and the opening 26 to the outside. The rubber can be reliably covered with a predetermined amount.
[0020]
The adjusting member 7 controls the amount of rubber discharged from the discharge passage 17, and as shown in FIG. 4, a rotating pin 30 provided with a through hole 31 in a direction perpendicular to the axis is inserted into the mounting member 14, and the through hole When 31 is made to coincide with the discharge passage 17, the passage is fully opened and the amount of rubber discharged becomes the largest. When the rotary pin 30 is rotated, the valve formed by the through hole 31 and the discharge passage 17 becomes small and the rubber is discharged. It has a mechanism to reduce the discharge amount.
[0021]
When the amount of rubber discharged is reduced, the internal pressure of the passage 16 is increased, and the adhesion of the adhesive rubber 12 to the cord 19 can be ensured and the amount can be increased. On the other hand, when the coating treatment is not performed, the passage is fully opened to increase the discharge amount of the adhesive rubber 12 and is disposed outside the discharge passage 17 mainly via the bypass passage 15 without leaving rubber. It is stored in the tank 33. The rubber stored in the tank 33 can be reused.
[0022]
The spinning means 80 is for winding the cord 19 coated with the adhesive rubber 12 directly around the cylindrical mold 50, and a turning arm 72 that can turn in the direction of the cylindrical mold 50 about the axis; A rotatable touch pulley 73 that moves with the rotating arm 72 and engages with the cord 19, and a push roll 74 that pivots outward on the outer peripheral surface of the touch pulley 73 and presses the cylindrical mold 50. ing.
[0023]
Thus, when continuously covering the surface of the cord 19 with the adhesive rubber 12,
(1) As an initial setting, the cord 12 is inserted into the guide hole 21 and traverses the main passage 16, and is extracted from the guide hole provided in the bottom surface of the die 3b, the through passage 25, and the open portion 26 so that it can run. .
[0024]
(2) Subsequently, after adjusting the temperature of the die to 60 to 120 ° C., the rubber 12 kneaded and extruded by the extrusion screw is provided on the outer periphery of the die 3b, the bypass passage 15, the linear main passage 16, and the discharge. The passage 17 is discharged without being retained. The rubber 12 splits the bypass passage 15 into a 180 ° clockwise route and a counterclockwise route, merges again, and is discharged from the discharge passage 17 to the outside. At the same time, the rubber 12 is discharged from the discharge passage 17 to the outside through the main passage 16. The At this time, the valve of the discharge passage 17 is fully opened by the adjusting member 7 to increase the amount of rubber discharged.
[0025]
(3) When the internal pressure of the main passage 16 is increased with the valve of the discharge passage 17 being slightly tightened by the adjusting member 7, rubber is adhered while the cord 19 is running at 5 to 10 m / sec. The rubber adhering at the through passage 25 is covered and fixed to the surface of the cord.
[0026]
When the rubber coating is to be stopped, the cord is not pulled out and the passage of the discharge passage 17 is fully opened until there is no rubber charged in the extruder, and the amount of rubber discharged is increased to improve the rubber flow. . The discharged rubber can be reused.
[0027]
Subsequently, in the spinning means 80, the rotating arm 72 is turned in the direction approaching the cylindrical mold 50 so that the touch pulley 73 is positioned close to the surface of the cylindrical mold 50, and the push roll 74 is moved to the cylindrical mold 50. The end of the cord 19 is gripped by being pressed against the surface. Subsequently, the cord 19 is wound around the cylindrical mold 50 almost once, and the tip portion is locked to the clip portion of the cylindrical mold 50, and then spinning is started. At this time, the push roll 74 is located away from the cylindrical mold 50, and only the touch pulley 73 is close to the cylindrical mold 50.
[0028]
When the spinning is completed, the touch pulley 73 is moved to a position away from the cylindrical mold 50.
[0029]
And as shown in FIG. 5, when spinning is completed, the outermost rubber | gum 55 which is compression rubber will be laminated | stacked, and the belt molded object 56 will be shape | molded. That is, after the cylindrical mold 50 having the rotation shafts 57 on both side walls is installed in a molding machine (not shown), synthetic fiber such as polyester, nylon, aramid, vinylon, etc. or cotton on the surface of the cylindrical mold 50 Natural fiber, etc., plain weave canvas composed of these interfering yarns, cover fabric 51 in which a knitted fabric or the like is formed into a cylindrical shape by a sewing joint, a core wire 54 in which adhesive rubber 12 is covered and fixed on a cord 19, and cut into a predetermined length A compressed rubber 55 arranged so that the short fibers are oriented in the axial direction is wound around the short fiber oriented rubber sheet to form a belt molded body 56 for a V-ribbed belt.
The core wire 54 immediately after the adhesive rubber 12 is covered and fixed to the cord 19 can be wound around the surface of the cylindrical mold 50 as it is.
[0030]
The manufacturing method of the short fiber oriented rubber sheet used here is, for example, connecting the die containing the conical inner die whose diameter is gradually expanded toward the discharge port to the outer die to the extruder, and feeding the short fiber A short fiber-oriented rubber obtained by extruding a cylindrical molded body in which the contained rubber is stretched in the circumferential direction and the short fibers are oriented in the circumferential direction, and the cylindrical molded body is cut in a straight line by a cutter. Use a sheet.
Of course, the manufacturing method of the said short fiber oriented rubber sheet does not need to be limited to this method, For example, what rolled to the short fiber oriented rubber sheet with the calendar | calender may be used.
[0031]
The rubber of the outermost rubber 55 used here is natural rubber, butyl rubber, styrene-butadiene rubber, chloroprene rubber, ethylene-propylene rubber, alkylated chlorosulfanated polyethylene, hydrogenated nitrile rubber, hydrogenated nitrile rubber and unsaturated. A mixed polymer with a carboxylic acid metal salt, an ethylene-propylene rubber (EPR), a rubber material such as an ethylene-α-olefin elastomer made of an ethylene-propylene-diene monomer (EPDM), or a mixture thereof is used. Examples of diene monomers include dicyclopentadiene, methylene norbornene, ethylidene norbornene, 1,4-hexadiene, cyclooctadiene, and the like.
[0032]
The rubber is made of fibers such as aramid fiber, polyamide fiber, polyester fiber, and cotton, and the length of the fiber varies depending on the type of the fiber, but short fibers of about 1 to 10 mm are used. For example, the aramid fiber is 3 About 5 mm, polyamide fiber, polyester fiber, and cotton are about 5-10 mm. The amount of addition is 10 to 40 parts by weight with respect to 100 parts by weight of rubber. Furthermore, a softener, a reinforcing agent made of carbon black, a filler, an antiaging agent, a vulcanization accelerator, a vulcanizing agent, and the like are added to the rubber of the present invention.
[0033]
Examples of the softening agent include general rubber plasticizers, for example, phthalates such as dibutyl phthalate (DBP) and dioctyl phthalate (DOP), adipates such as dioctyl adipate (DOA), and dioctyl sebacate (DOS). Sebacates, phosphates such as tricresyl phosphate, etc., or general petroleum softeners are included.
[0034]
The core wire 54 used here is obtained by covering and fixing the adhesive rubber 12 to the cord 19, and as shown in FIG. 6 , the two cords 19 are completely surrounded by the adhesive rubber 12, and the cross-sectional shape is also square. A rectangle such as a rectangle, a flat shape, or a circle may be used. However, the rectangular shape is preferable for arranging the cores 54 without gaps. Of course, one cord 19 covered with the adhesive rubber 12 can also be used. However, if the cord 54 in which the two cords 19 are covered with the adhesive rubber 12 is used, the twisted wrinkle of the cord is eliminated, so that spinning is performed. In addition, the cord arrangement disorder can be eliminated, the spinning time can be shortened, and when the Z twist and the S twist are used in pairs, the vibration of the formed belt and the occurrence of vibration are reduced.
[0035]
Further, in the cross section of the core wire 54, the area occupied by the adhesive rubber 12 is 50 to 80%, and the core wire 54 can be arranged without a gap as long as the rubber covering amount is about this level.
[0036]
As the cord 19 used here, a rope made of polyethylene terephthalate fiber, polyester fiber having ethylene-2,6-naphthalate as a main constituent unit, and polyamide fiber is used, and an adhesion treatment is performed for the purpose of improving the adhesion to rubber. Is given. As such an adhesion treatment, it is common to immerse the fiber in resorcin-formalin-latex (RFL solution) and then heat-dry to form a uniform adhesion layer on the surface. However, the present invention is not limited to this, and there is also a method of performing a pretreatment with an epoxy or isocyanate compound and then treating with an RFL solution.
[0037]
The adhesive rubber 12 is obtained by removing short fibers from a rubber compound of the compressed rubber 55.
[0038]
The belt molded body 56 for V-ribbed belt thus obtained is vulcanized to obtain a belt sleeve. Next, the belt sleeve is hung on the driving roll and the driven roll, travels under a predetermined tension, and the rotated grinding wheel moves so as to contact the traveling vulcanization sleeve to compress the vulcanization sleeve. A plurality of groove portions are ground on the rubber layer surface at once. The belt sleeve thus obtained is removed from the driving roll and the driven roll, and the belt sleeve is hung on the other driving roll and the driven roll, and the belt sleeve is cut to a predetermined width by a cutter, and each V-ribbed belt is cut. Finish.
[0039]
As shown in FIG. 7, the obtained V-ribbed belt 60 has the cord 19 embedded in the adhesive rubber 12, and has a compression rubber layer 61 that is an elastic body layer below the cord 19. The compressed rubber layer 61 is provided with a plurality of rib portions 62 having a substantially triangular cross-section extending in the longitudinal direction of the belt, and it is not necessary to provide the rubberized canvas 63 on the belt surface.
Of course, in the present invention, a V-belt can be manufactured in addition to the V-ribbed belt.
[0040]
【The invention's effect】
As described above, in the transmission belt molding apparatus according to the claims of the present application, the adhesive rubber is covered and fixed to the cord, so that it is not necessary to use the adhesive rubber at the time of belt molding, and the cord coated with the adhesive rubber is dried. It is possible to rationalize the molding by spinning directly, and further, by covering the surface of the cord with adhesive rubber, the twist of the cord can be eliminated, so that the disorder of the cord arrangement at the time of spinning can be eliminated, This has the effect of eliminating problems such as runout and sounding of the transmission belt.
[Brief description of the drawings]
FIG. 1 is a schematic view of a transmission belt forming apparatus according to the present invention.
FIG. 2 is a cross-sectional view of rubber coating means used in the transmission belt molding apparatus according to the present invention.
FIG. 3 is a cross-sectional view of FIG. 2 as seen from the AA direction.
4 is a cross-sectional view of FIG. 2 as seen from the BB direction.
FIG. 5 is a schematic view of a manufacturing process of a transmission belt according to the present invention and corresponds to the drawing seen from the CC direction of FIG. 1;
FIG. 6 is a cross-sectional view of a core wire used.
FIG. 7 is a cross-sectional view of the obtained V-ribbed belt.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rubber coating means 2 Extruder 3a, 3b Die 4 Cord travel part 5 Guide member 6 Rubber coating die 7 Adjustment member 12 Adhesive rubber 15 Bypass passage 16 Main passage 17 Discharge passage 19 Code 50 Cylindrical mold 51 Cover cloth 54 Core wire 55 Compression rubber 56 Belt molded body 70 Transmission belt molding apparatus 80 Spinning means

Claims (2)

In a transmission belt molding apparatus that spins a cord coated with adhesive rubber into a cylindrical mold,
Adhesive rubber kneaded and extruded by an extruder is divided into a bypass passage provided in the outer peripheral direction of the die and a straight main passage, and the divided adhesive rubber is joined to a discharge passage so that the adhesive rubber is to flow discharged without staying in the passage, the code at the same time, a rubber coating unit for depositing continuously rubber while moving so as to cross the passage, directly into a cylindrical mold a code covering the rubber An apparatus for forming a power transmission belt, characterized in that a spinning means for winding is directly connected.   2. The transmission belt molding apparatus according to claim 1, wherein the rubber coating device is configured to cover and fix the adhesive rubber to the two cords simultaneously.

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