JP2000351431A - Round belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve traveling stability by improving slidability of a round belt surface, and to prevent carrying failure of a work accompanying a sticky object by improving separability of the round belt surface by forming a coating film of silicone on a surface of a base material mainly composed of thermoplastic polyurethane. SOLUTION: In a round belt B, a coating film 2 of silicone is formed over the whole surface of a surface of a base material 1 mainly composed of thermoplastic polyurethane or thermoplastic polyvinyl chloride. Thus, an abrasion coefficient of the surface of the round belt B is reduced to improve slidability to improve traveling stability of the round belt B to thus eliminate running-on of the round belt B to a side wall of a pulley 13 composed of a groove 13a to prevent falling-off (shown by a broken line) of the round belt B to prevent an increase in early abrasion and residual elongation. Since separability of the surface of the round belt B can be improved, even if a work accompanies a sticky object, the sticky object does not stick to thereby prevent generation of a defective of the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a round belt having improved slipperiness, separation and the like.

[0002]

2. Description of the Related Art In general, since a round belt has no directionality in a cross-sectional shape, power can be transmitted even when a transmission surface is three-dimensional. Accordingly, the transmission function can be achieved by winding the rotation shaft between the pulleys in the “twisted positional relationship”.

On the other hand, as a transfer device in which a transfer surface is formed by round belts, there is a transfer device in which a plurality of round belts having a two-dimensional transmission surface run in parallel and a work is transferred on these round belts. Are known. There is also a transfer device in which each roller of the roller conveyor is driven from a drive shaft rotating below via a round belt, in which case the round belt passes through a transfer surface formed on the roller. become.

[0004]

When the power transmission surface is three-dimensional, the round belt runs between the pulleys while being twisted, so that the round belt exhibits an unstable behavior by receiving a force in the groove width direction in the groove of the pulley. . As a result, the round belt gets on the side wall of the pulley, comes off, causes early wear of the round belt, or excessive tension acts, plastic deformation of the round belt proceeds, and the residual elongation increases.

On the other hand, when the round belt forms the transport surface of the transport device or passes through the transport surface, when the work is accompanied by an adhesive such as, for example, a compress bond or food, the adhesive is attached to the round belt. If it adheres and adheres to the subsequent work, a defective product will be produced.

The present invention has been made in view of such a point, and an object of the present invention is to improve the running stability of a round belt by improving the slipperiness of the surface of the round belt by using silicone to improve the pulley stability. While preventing the round belt from falling off, premature wear, and increasing residual elongation due to riding on the side wall,
An object of the present invention is to improve the separation property of the surface of a round belt and to convey a work with an adhesive substance while preventing the occurrence of defective products.

[0007]

According to a first aspect of the present invention, there is provided a round belt in which a silicone film is formed on a surface of a base material mainly composed of thermoplastic polyurethane or polyvinyl chloride. Features.

In this round belt, the coefficient of friction on the surface of the round belt is reduced by the silicone film, so that the slipperiness is improved and the running stability of the round belt is improved. As a result, the round belt does not run over the side wall of the pulley, thereby preventing the round belt from falling off, preventing early wear and increasing residual elongation, and improving the releasability of the round belt surface to prevent adhesion of the sticky substance. Of defective products is prevented. Further, the main component of the base material is thermoplastic polyurethane or polyvinyl chloride, and the film is silicone, so that the base material is familiar and has excellent wear resistance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A round belt B according to an embodiment of the present invention will be described below. As shown in FIG. 1, the round belt B is formed by forming a silicone film 2 on the entire surface of a base material 1 mainly composed of thermoplastic polyurethane or thermoplastic polyvinyl chloride. . The substrate 1 may have a purity of 100% of the above material. Silicone refers to a polymer in which a siloxane bond, which is a bond in which silicon (silicon) and oxygen are alternately repeated, is a skeleton, and the silicon is provided with an organic atomic group.

Next, a method for manufacturing the round belt B will be described. First, the base material 1 is formed by extrusion from the base material melted by heating, and cooled. Next, both ends of the base material 1 are joined by heat welding or the like, and are connected in a ring shape. And
This is immersed in a solution obtained by dissolving silicone in a solvent. Then, it heats for a predetermined time and cools gradually. By heating for a predetermined time in this manner, the annealing process for stabilizing the molecules of the base material 1 and taking strain proceeds, and the solvent dissipates from the solution to form the silicone film 2 on the surface of the base material 1. You. In this case, by shortening the heating time, the present embodiment concentrates on the formation of the silicone film 2 on the surface of the base material.
May be performed by providing a separate step.

FIG. 2 shows an example of use in which this round belt B is used to perform a transmission function by being wound around pulleys whose rotating shaft is in a "twisted positional relationship". That is, the rollers 12, 12,... Are rotatably mounted between the parallel running rails 11 (the front rail is not shown).
A groove 13a is engraved in a portion near the side end of the driven pulley 13 to form the driven pulley 13. Further, the rollers 12, 12,.
Drive shaft 14 so that
Are fixed to the driving shaft 14 in correspondence with the driven pulley 13. And
A round belt B is wound between each driven pulley 13 and the corresponding drive pulley 15. With the above configuration, the drive shaft 1
4 rotates, each driven pulley 1 passes through each round belt B.
3 rotates, the respective rollers 12 rotate, and the rollers 12, 12
The work is transferred on the transfer surface formed by.

FIG. 4 shows a transfer device in which a transfer surface is formed by a round belt as an example of use of a round belt B. That is, the rollers 22, 22,... Are rotatably mounted between the parallel running rails 21 (the front rail is not shown), and grooves are formed in the adjacent rollers 22, 22, and the round belt B is wound. . In this way, a plurality of round belts B having a two-dimensional transmission surface are provided so as to be able to travel in parallel, and at least a part of the rollers 22 is driven, whereby these round belts B,
The workpiece is transported on B ..

In this round belt B, the silicone film 2 reduces the friction coefficient of the surface of the round belt, so that the slip property is improved and the running stability of the round belt B is improved. Therefore, in the example of use of FIG. 2, as shown in FIG.
3 does not run on the side wall and the round belt B is prevented from falling off (indicated by a broken line), thereby preventing early wear and increase in residual elongation. In addition, since the coefficient of friction of the surface of the round belt B is reduced by the silicone film 2,
The separation property of the surface of the round belt is improved. Therefore, in the use example of FIG. 4, even when the work has an adhesive, such as a compress bond or food, the adhesive does not adhere,
The occurrence of defective products is prevented. This is not only the case where the round belt B forms the transfer surface of the transfer device as in the use example of FIG. 4, but also when the round belt B passes through the transfer surface as in the use example of FIG. 2. Similarly, the adhesion of the sticky substance to the round belt B is prevented, and the occurrence of defective workpieces is prevented. Furthermore, the main component of the base material 1 is thermoplastic polyurethane or polyvinyl chloride, and the film 2 is silicone, so that the round belt B is excellent in abrasion resistance.

[0014]

DETAILED DESCRIPTION OF THE INVENTION A round belt in which a silicone film is formed on the entire surface of a base material mainly composed of thermoplastic polyurethane is defined as a product of the present invention, and a round belt having no silicone film formed on the same base material. Use a normal belt.

First, the coefficient of friction was measured for these round belts. The test method was to fix two round belts in parallel on a laboratory bench, and then polish steel test pieces (1 kgf) on them.
Alternatively, a test piece (1.04 kgf) of Duracon was placed, and the test piece was dragged along the longitudinal direction of the round belt (speed: 500 mm / min). Then, the tensile force required for moving and the tensile force required after moving were measured. The diameter of each round belt is 5.5m
m. Table 1 shows the static friction coefficient and the dynamic friction coefficient analyzed from the test results. According to the experimental results, it is apparent that the friction coefficient of the product of the present invention is smaller than that of the normal product, and the slip property and the separation property are greatly improved.

[0016]

[Table 1]

Next, the elongation percentages of these round belts were measured. The test method was performed by winding a round belt between a driving pulley and a driven pulley having a “twisted positional relationship” at a crossing angle of 90 ° so that the transmission surface was three-dimensional. The diameter of both the driving pulley and the driven pulley is 30 mm,
The rotation speed of the driving pulley is 300 rpm, the belt speed is 0.471 m / sec, and the initial tension is 290 mm.
Was set at a standard of 7%. The diameter of each of the round belts is 5 mm. Table 2 shows the elongation percentage of the normal round belt analyzed from the test results, and Table 3 shows the elongation percentage of the round belt of the present invention. It is clear that the product of the present invention has a smaller elongation rate than the normal product and the residual elongation is suppressed.

[0018]

[Table 2]

[0019]

[Table 3]

[0020]

According to the round belt of the first aspect, the smoothness of the surface of the round belt is improved by silicone, so that the running stability of the round belt is improved, and the round belt falls off due to running on the side wall of the pulley. Wear and an increase in residual elongation can be reliably prevented, and the releasability of the surface of the round belt is improved, so that work with an adhesive can be conveyed while preventing occurrence of defective products.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a round belt according to an embodiment.

FIG. 2 is a perspective view showing a drive system of a transfer device having a three-dimensional transmission surface.

FIG. 3 is an enlarged view showing the vicinity of a pulley in FIG. 2 in a cross section of a round belt.

FIG. 4 is a perspective view showing a transfer device having a transfer surface formed by a round belt.

[Explanation of symbols]

 B Round belt 1 Base material 2 Coating

Claims (1)

[Claims] 1. A round belt wherein a silicone film is formed on the surface of a substrate mainly composed of thermoplastic polyurethane or polyvinyl chloride.