JPH0462965B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a power transmission belt in which a plurality of tensile strength cores such as steel cords are embedded in the longitudinal direction of the belt;
The present invention relates to an endless belt with a toothed tensile strength core that can be used for any type of conveyor belt, and to an improvement in its manufacturing method. (Prior art) Conventionally, a toothed endless belt with a tensile strength core, in which multiple tensile strength core cords such as glass fiber bar cords and steel cords are embedded in the belt's longitudinal body, has been manufactured using the methods described in (a) to (c) below. Manufactured by. (a) Mandrel molding: A toothed groove is carved into a cylindrical mandrel, a rubberized canvas and a rubber sheet are wrapped around the mandrel, a tensile strength core is wound in a coil shape, and a rubber layer is placed on top of that. After coating, the mandrel is placed in a circular curing can and vulcanized. (b) This is a special method for manufacturing long belts in the power transmission belt field and conveyor belt field.
A continuous tensile core cord is wound into a coil between a pair of support rolls spaced apart at a predetermined distance.
It is manufactured by coating both sides with a toothed rubber layer and a rubber layer to form a laminated structure, and then vulcanizing it in a step press. (c) Once a belt with a tensile strength core is made with ends, it is cut to the required length and both ends are endlessly processed using a conventional method (for example, the core at the joints at both ends is The core bodies are assembled from both ends in a nested manner, and then the rubber layers are bonded together via unvulcanized rubber for adhesion and vulcanization bonded. (Problems to be Solved by the Invention) However, the manufacturing methods described in (a) to (c) above or the belts manufactured by these methods have the following drawbacks. First, method (a) is a method widely adopted in the power transmission belt field, but the size (diameter) of the vulcanization can
Because of the limitations, it is usually only possible to manufacture belts with a circumference of less than 6 m, making them unsuitable for manufacturing long belts. In addition, according to method (b), it is difficult to wind the tensile strength core in a well-aligned coil shape, and if necessary, secondary processing is performed by drilling holes on the belt surface (for example, drilling holes for suction with a vacuum). , when drilling holes for the purpose of stably transporting cardboard etc. by suction), the tensile strength core is skewed (due to being wound into a coil), so the holes aligned in a straight line are Difficult to open. In addition, if you try to drill holes that are aligned linearly, you will inevitably drill holes in a certain part of the tensile core, which will break the tensile core, which will not only reduce the strength, but also cause damage to the tensile core. This has the drawback that water and other substances can enter from this location, causing peeling from the tensile strength core layer and shortening the belt's lifespan. Furthermore, according to method (c), the welding efficiency of the endlessly machined part is low, causing early bending fatigue and shortening the service life.Also, the number of tensile strength cores arranged only in the endlessly machined part is doubled, and each tensile strength The spacing between the cores became narrower, the thickness in the same areas became thicker, and the rigidity increased in the same areas, making them less flexible, resulting in holes and other problems when running, making it difficult to run stably. (Means for Solving the Problems) The present invention was invented in view of the above-mentioned problems. By arranging the belts in a straight line around the circumference, there is no risk of cutting accidents when the belt is used, and there is no risk of physical damage such as breakage of the tensile core when performing secondary processing such as drilling holes on the belt surface. It is an object of the present invention to provide a toothed endless belt with a tensile strength core that can be used for either transmission or conveyance without causing damage. The configuration of the present invention will be explained below. That is, the gist of the present invention is that, in a toothed endless belt in which a plurality of tensile strength cores are embedded in the longitudinal direction, each joining point at both ends of the strength cores is connected at intervals over the entire circumference of the belt. The first invention provides a belt in which a tensile strength core is suspended between a pair of support rolls arranged at a predetermined interval, and a belt having no plural joints in the same width direction is provided. A plurality of endless cores are formed by joining both ends, and the endless cores are moved by appropriate lengths on the support roll to disperse the joints of the endless cores over the entire circumference in the same width direction. A second invention provides a method for manufacturing a toothed endless belt containing a tensile strength core, which comprises providing a rubber layer and a toothed rubber layer on both sides of the endless core by a conventional method after eliminating the presence of the rubber layer. . Next, embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a cross-sectional view in the width direction of a toothed endless belt containing a tensile strength core of the present invention, Fig. 2 is a longitudinal cross-sectional view of the belt of the present invention when the surface of the toothed part is covered with a reinforcing part, and Fig. 3 is a cross-sectional view in the longitudinal direction of the toothed endless belt of the present invention. A cross-sectional view in the width direction of a toothed endless belt with a tensile strength core in which holes are bored at appropriate intervals on both ears, FIG. 4 is a plan view of the same, and FIG. ) is a cross-sectional view in the width direction of a toothed endless belt with a tensile strength core in which holes are bored at appropriate intervals, FIG. 6 is a plan view of FIG. 5, and FIG. 7 is a surface of the belt shown in FIG. 3. FIG. 8 is a cross-sectional view in the width direction of a belt whose surface has been roughened, and FIG. 8 is a partially cutaway plan view of the belt of the present invention. Figures 1 and 2 mainly show belts that can be used as power transmission belts, where 1 is the belt body, 2 is a rubber layer, 3 is a toothed part, and 4 is a tensile core such as a steel cord. It is the body. In addition, 15
is a reinforcing cloth coated on the surface of the toothed part. Third
The figure and Figures 4a and 4b show belts that can be mainly used as conveyor belts (for example, holes are bored in the belt for the purpose of stably conveying cardboard, boards, etc. by suction from the back side of the belt with a vacuum. Size of the holes) may be zigzag, symmetrical, oval or circular as long as it has an area suitable for suctioning the conveyed objects), and numeral 5 indicates holes, which are located at both ears of the belt. Holes are drilled at appropriate intervals. Fifth
6 and 6 show a belt in which a plurality of toothed portions 3 are provided in the width direction of the belt, and holes 5 are bored between adjacent toothed portions (for example, air can be supplied from the back side of the belt). A hole is made for the purpose of drying an article containing high moisture content or an article to be adhesively processed such as paper or cloth by blowing it therein). 7th
Figures a and b show the belts shown in Figures 3 and 5, in which the surface (the side opposite to the toothed portion) has been roughened with minute irregularities 6 and the like. Further, in FIG. 8, 7 indicates the joints of the tensile strength core 4 embedded in the belt, and the joints 7 are distributed at intervals around the entire circumference of the belt, and are arranged in the same width direction. is set so that there are no more than one. In addition to the steel cord, the tensile strength core used in the above-mentioned embodiments of the present invention may include stainless steel cord, glass fiber cord, carbon fiber cord, aromatic polyamide cord, polyester fiber cord, etc. depending on the final use. Select the most suitable material according to the requirements. The toothed endless belt of the present invention is constructed as described above, and an example of its manufacturing method is as follows. To explain with reference to FIG. 9, first, a tensile strength core 4 of a predetermined length is placed between a pair of support rolls 8, 8' with a predetermined interval between them (one roll is a driving roll and the other roll is a driven roll). By adjusting the length using a jig 10 suspended between the tapes 9 and joining them by a specific joining means such as welding as shown in FIG. 11 described below, multiple pieces can be made. As shown in FIG. 10, a plurality of joints 7 of the endless tensile strength core are formed in the same width direction (in other words, there is one joint 7 in the same width direction). There are no more)
Slowly tighten the joint 7 around the entire circumference of the belt.
Move and disperse at appropriate intervals. Next, a toothed rubber layer (containing reinforcing cloth) and a rubber layer are laminated by applying an appropriate tension to these endless cores and using unvulcanized rubber for adhesion in a conventional manner. Finally, a conventional vulcanization method (usually
The target belt of the present invention can be obtained by vulcanizing the entire belt using a step press method (using a step press method) and completely adhering the rubber layer, tensile strength core, and toothed rubber layer. Note that a to f in FIG. 11 show specific examples of the joining means for the tensile strength core, and like the brazing means (see FIG. 11a), both ends of the tensile strength core 4 (see FIG. 11A) are used. ) are joined by brazing 11 (FIG. 11B) or by metallurgical joining such as by fusion welding means (FIG. 11B), the welded portions at both ends of the tensile strength core 1 (FIG. 11A) are fused 12. (Figure B),

[Table] (Results of the present invention) The toothed endless belt containing a tensile strength core of the present invention having the above-mentioned configuration has the following effects. (1) In the belt of the present invention, the plurality of tensile strength cores embedded therein are endless, and the joints thereof are distributed over the entire circumference of the core,
Since there are no more than one in the same width direction, parts that have lower strength than other parts, such as the bending strength at joints, are dispersed throughout the belt, and even in specific parts of the belt, unlike in the past, Since there is no possibility of a decrease in strength, the risk of belt breakage during use is eliminated. (2) In addition, in the belt of the present invention, each core embedded therein is independent, so S
It is possible to alternately arrange the twisted and Z-twisted ones, and by this alternating arrangement, the repulsion of the twisting cancels each other out, so that no distortion occurs during vulcanization, and the runnability is also good. (3) Furthermore, as mentioned above, each core in the belt of the present invention is an independent endless member, so the number of cores arranged and the pitch (interval) of the cores can be arbitrarily selected. The tensile strength core can be arranged linearly. (4) Therefore, by ensuring the parallel and straightness of the spacing between the tensile cores, it is possible to drill holes without breaking the tensile cores even when drilling holes as a secondary process. This prevents water from entering the tensile core layer and causing peeling, etc., which not only extends the life of the belt, but also makes it possible to drill holes that are aligned linearly around the entire circumference of the belt. . Therefore, when used as a belt for conveying a cardboard box or the like while sucking the vacuum through the holes, the belt is optimal because the vacuum can effectively exert its suction function. (5) Furthermore, according to the manufacturing method of the present invention, by arbitrarily setting the interval between the pair of support rolls,
The length of the tensile core suspended on this can be either short or long, and by using a step press as a vulcanizer, it is also possible to manufacture a toothed endless belt with a long tensile core. It is possible. (6) Furthermore, as mentioned above, it is possible to manufacture a long toothed endless belt with a tensile strength core, and the vulcanization can be performed using a continuous plate press instead of a batch-type vulcanizer. , manufacturing efficiency can be improved, and manufacturing costs can also be reduced. (7) As described above, according to the present invention, it can be used not only as a transmission belt, but also as a conveyance belt by sucking vacuum from the holes by providing holes in the part excluding the toothed part. It can be used as a conveyor/drying belt that can blow air through the holes to dry articles containing high moisture content while conveying them.
An extremely versatile belt can be provided.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view in the width direction of the belt of the present invention mainly applied to a power transmission belt, Figure 2 is a cross-sectional view in the longitudinal direction of the belt of the present invention when the surface of the toothed portion is covered with reinforcing cloth, and Figure 3 4 is a cross-sectional view in the width direction of the belt of the present invention mainly applied to a conveyor belt, FIGS. 4a and 4b are plan views of the same, FIG. 5 is a plan view, FIGS. 7a and 7b are cross-sectional views in the width direction of the belt shown in FIGS. 3 and 5, FIG. 8 is a partially cutaway plan view of the belt of the present invention, and FIGS. 9 and 10. The figure is an explanatory diagram showing a method of joining the tensile strength core, which is one manufacturing process of the belt of the present invention.
Figures 1a to 1f are explanatory diagrams showing specific joining means for the tensile strength core used in the belt of the present invention, and Figure 12 compares the flexural fatigue properties of the belt of the present invention and a conventional product (processed after endless). It is a graph showing experimental results. DESCRIPTION OF SYMBOLS 1... Belt main body, 2... Rubber layer, 3... Toothed part, 4... Tensile core, 5... Hole, 6... Unevenness, 7... Joint part.

Claims (1)

[Scope of Claims] 1. In a toothed endless belt in which a plurality of tensile strength cores are embedded in the longitudinal direction, each joining point at both ends of the strength strength cores is distributed at intervals over the entire circumference of the belt, and has the same width. A toothed endless belt with a tensile strength core that is characterized by not having multiple joints in one direction. 2 A tensile strength core is suspended between a pair of support rolls arranged at a predetermined interval, and both ends of the core are joined to form a plurality of endless cores, and the endless core is appropriately placed on the support rolls. After moving length by length to disperse the joints of the endless core over the entire circumference so that they do not exist in the same width direction, apply a rubber layer and a toothed rubber layer to both sides of the endless core using a conventional method. A method for manufacturing a toothed endless belt containing a tensile strength core.