JP6522412B2 - Flat belt - Google Patents

Description

  The present invention relates to a flat belt used for a conveying device, a power transmission device, and the like.

  Conventionally, belt conveyors are widely used for transporting powder and food. In such a belt conveyor, as shown in FIG. 2, an endless flat belt 10 is wound around a drive pulley 110 and a driven pulley 120. The flat belt 10 travels on a table 130 supporting a portion on which the object 140 is placed between the drive pulley 110 and the driven pulley 120 while the power of the drive pulley 110 is frictionally transmitted while sliding on the table 130. Do.

In the flat belt 10, usually, a woven fabric (sail cloth) is adhered to an inner circumferential surface in sliding contact with the table 130 in consideration of friction with the table 130. Therefore, when powder or food is transported using this flat belt, foreign matter such as powder and its fragments, oil component of food, liquid juice, etc. wrap around from the transport surface of flat belt 10 to the back side (belt inner circumferential surface side) The pressure on the driving pulley 110 and the driven pulley 120 and the table 130 causes the sheet to be strongly rubbed into the woven fabric on the inner peripheral surface of the flat belt 10. Thus, the foreign matter which has invaded into the woven fabric enters the gap between the yarn and the yarn of the woven fabric, and the yarn is stretched in the thickness direction of the belt, and as a result, the inner peripheral surface side of the belt There is a problem of contracting in the direction.
The contraction of only the inner circumferential surface of the belt causes the belt to meander during traveling. In addition, since the tension of the belt increases, the load on the bearings and shafts of the drive pulley 110 and the driven pulley 120 increases, causing damage. Furthermore, there is also a problem that the belt once removed can not be attached to the pulley again.

  In order to prevent foreign matter from invading the woven fabric on the inner peripheral surface of the belt, Patent Document 1 proposes that a resin layer be formed on the surface of the woven fabric. In addition, Patent Document 2 proposes a flat belt that prevents the belt from shrinking by using a canvas knitted with a warp including an elastic yarn having stretchability in the longitudinal direction of the belt as the woven fabric.

  However, when the surface of the woven fabric is coated with a resin as in Patent Document 1, there is a problem that the friction with the table 130 or the like at the time of running the belt becomes large, and conveyance becomes difficult.

  On the other hand, as described in Patent Document 2, when using a stretch yarn for the woven fabric, it is said that the belt can be prevented from shrinking even if foreign matter such as powder penetrates, but long-term use etc. As a result, when a large amount of foreign matter is accumulated in the woven fabric, the expansion and contraction function is impaired, the life of the belt is shortened, and the use of the expansion yarn causes a problem of high manufacturing cost.

Japanese Patent Laid-Open No. 2000-309414 JP, 2010-269918, A

  An object of the present invention is to provide a flat belt which prevents foreign matter such as powder from entering into a woven fabric, realizes low friction, and can be used for a long time.

MEANS TO SOLVE THE PROBLEM The present inventors came to complete this invention, as a result of earnestly examining in order to solve the said subject. That is, the present invention has the following configuration.
(1) A core woven fabric extending in the longitudinal direction of the belt, an elastomer layer provided on one surface of the core woven fabric, and a woven fabric provided on the other surface of the core woven fabric, A flat belt characterized in that the woven fabric has a thickness of 0.3 mm or less and a porosity of 70% or less.
(2) The flat belt as described in (1) whose dynamic friction coefficient of the surface is 0.18 or less.
(3) The flat belt according to (1) or (2), wherein the woven fabric has a surface static friction coefficient of 0.25 or less.
(4) The flat belt according to any one of (1) to (3), wherein the woven fabric is a taffeta woven fabric.

  According to the present invention, the woven fabric provided on the other side of the core woven fabric has a small thickness of 0.3 mm or less and a low porosity of 70% or less, so the surface of the woven fabric is dense, It is suppressed that foreign substances such as powder and its fragments, food oil and meat juice are almost rubbed into the woven fabric. As a result, the belt does not shrink and has low friction, so that it can travel smoothly and can be used for a long time.

It is a sectional view of a flat belt concerning one embodiment of the present invention. It is explanatory drawing which shows the belt conveyor using a flat belt.

  Hereinafter, embodiments for carrying out the invention will be described.

  FIG. 1 is a cross-sectional view showing a flat belt 10 according to an embodiment of the present invention. As shown in FIG. 1, the flat belt 10 is provided with at least one core woven fabric 20, an elastomer layer 30 is provided on the upper surface of the core woven fabric 20, and a resin layer 40 is formed on the lower surface of the woven core 20. The woven fabric 50 is laminated and bonded to each other. The elastomer layer 30 and the woven fabric 50 form the outer circumferential surface and the inner circumferential surface of the endless flat belt 10, respectively.

  As the core woven fabric 20, for example, a canvas etc. can be used. The core woven fabric 20 is woven by warp yarns 20A extending along the longitudinal direction of the flat belt 10 and weft yarns 20B extending along the width direction of the flat belt 10, and in the longitudinal direction of the belt Core of flat belt 10 having high tension (tensile force).

The warp yarns 20A are, for example, multifilaments, and synthetic fibers such as polyester, polyamide, polyvinyl, polyester, polyacrylic, polyethylene, polypropylene, polyurethane, polyfluorocarbon, fluorine-containing, etc. used.
The weft yarn 20B is, for example, a spun yarn or a monofilament, and is a synthetic fiber yarn of polyester, polyamide, polyvinyl, polyester, polyacrylic, polyethylene, polypropylene, polyurethane, polyfluorocarbon, fluorine-containing, etc. The core woven fabric 20 is formed by appropriately selecting the warp yarn 20A and the weft yarn 20B from the above configuration.
When a multifilament having stretchability is used as the warp yarn 20A, stretchability in the longitudinal direction of the flat belt 10 is secured. When a monofilament is used for the weft yarn 20B, the rigidity in the width direction of the flat belt 10 is secured, the elastomer layer 30 can be made thin, and weight reduction can be achieved.
Also, the core woven fabric 20 may be provided in one or more layers. When a plurality of core woven fabrics 20 of the same or different materials are used by adhesion lamination, the resistance and strength of the flat belt 10 can be further improved.

The elastomer layer 30 is adhesively laminated on the upper surface (peripheral surface) of the core woven fabric 20, and contacts the transferred object 140 shown in FIG.
The elastomer layer 30 may be, for example, a thermoplastic elastomer, and various additives may be added as needed. Examples of the thermoplastic elastomer include polyurethane-based elastomers, polyester-based elastomers, polyamide-based elastomers, polyolefin-based elastomers and the like, and these are used alone or in combination.

  The woven fabric 50 is a woven fabric woven by warp yarns 50A extending in the longitudinal direction of the flat belt 10 and weft yarns 50B extending in the width direction of the flat belt 10. The woven fabric 50 is adhesively laminated on the lower surface of the core woven fabric 20, and contacts the driving pulley 110, the driven pulley 120, and the support table 130 as the inner peripheral surface of the flat belt 10 as shown in FIG.

As the woven fabric 50, a woven fabric having a thickness of 0.3 mm or less, preferably 0.03 to 0.4 mm, and a porosity of 70% or less is used. The porosity can be determined by the method described in the examples described later.
Such a woven fabric 50 is meant to have a thin and close-packed fine structure. Therefore, the woven fabric 50 can prevent the foreign matter such as powder from being rubbed into the belt, and the slippage can be improved with respect to the pulley and the support table. On the other hand, when the thickness is large, the concave portion formed between the yarn and the yarn becomes large, and foreign matter is easily rubbed in. In addition, when the porosity is large, the foreign matter easily intrudes into the gap between the yarn and the yarn. In order to obtain the woven fabric 50 having the above thickness and porosity, for example, it is preferable to weave finely using a yarn with the smallest possible diameter.

The woven fabric 50 preferably has a surface dynamic friction coefficient of 0.18 or less and a surface static friction coefficient of 0.25 or less. Thus, the woven fabric 50 has a low coefficient of friction and good slippage mainly because it has a dense structure with a thin thickness and a close eye as described above.
Examples of the woven fabric 50 include, but are not limited to, taffeta woven fabric and the like. Further, as the warp 50A and weft 50B constituting the woven fabric 50 such as taffeta woven fabric, besides silk, polyester, polyamide, polyvinyl, polyester, polyacrylic, polyethylene, polypropylene, polyurethane, Polyfluorocarbon-based and fluorine-containing synthetic fiber yarns and the like can be mentioned. The thickness of these yarns should not be larger than the thickness of the woven fabric 50.
The woven fabric 50 is not limited to one layer, and two or more layers may be laminated and bonded.

  The woven fabric 50 is adhesively laminated on the inner circumferential surface of the core woven fabric 20 via the resin layer 40, for example. The resin layer 40 has a function of bonding the woven fabric 50 and the core woven fabric 20 as an adhesive. The resin layer 40 is not particularly limited as long as it can bond the woven fabric 50 and the core woven fabric 20. For example, the various thermoplastic elastomers described above can be used, and further, resins such as polyurethane, polyvinyl chloride and polyolefin are used. You may use it.

Next, a method of manufacturing the flat belt 10 of the present embodiment will be described. First, a core woven fabric 20 of a predetermined length is prepared. Next, the elastomer material constituting the elastomer layer 30 is impregnated or coated on one side (the outer peripheral surface side of the belt 10) of the core woven fabric 20 and cured to laminate the core woven fabric 20 and the elastomer layer 30 Form a body. Next, the resin constituting the resin layer 40 is impregnated or coated on the other surface of the core woven fabric 20 (inner peripheral surface of the belt 10), and a laminate of the core woven fabric 20 and the resin layer 40, and the woven fabric 50 are laminated, and the resin is cured to form a resin layer 40. Thereby, the belt 10 is manufactured. Alternatively, the resin layer 40, the core woven fabric 20 and the elastomer layer 30 may be laminated and bonded to the surface of the woven fabric 50 in this order.
The endless flat belt 10 may be manufactured by joining both ends of a long flat belt.

  EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples.

Example 1
A plain taffeta woven fabric (nylon taffeta) was prepared by using 66 nylon multifilament yarn having a fineness of 30 denier for warp and weft.
A core woven fabric made of nylon canvas is laminated and bonded to the surface of this nylon taffeta via a resin layer made of thermoplastic polyurethane, and further thermoplastic polyurethane is laminated and bonded to the surface of the core woven fabric, and the length is about 30,000 mm The flat belt of

(Example 2)
A flat belt was produced in the same manner as in Example 1 except that 66 nylon multifilament yarn having a fineness of 44 denier was used for the warp yarn and weft yarn.

(Comparative example 1)
A flat belt was produced in the same manner as in Example 1 except that a canvas using a polyester filament yarn having a fineness of 1000 denier was used as the warp and weft.

（注１）織布および帆布の「厚さ」は、糸の繊度から計算して求めた。
（注２）織布および帆布の「計算質量」は、記式から求めた。
計算質量＝糸の比重×１００²×厚さ
（注３）「糸の空間占有率（%）」は、織布または帆布において糸が占有する空間を意味し、下記式から求めた。
糸の空間占有率（%）＝（実測質量／計算質量）×１００
（注４）「空隙率」は、下記式から求めた。
空隙率（%）＝１００−糸の空間占有率（%） Details of the taffeta woven fabric used in Examples 1 and 2 and the canvas used in Comparative Example 1 are shown in Table 1.

(Note 1) “Thickness” of woven fabric and canvas was calculated from the fineness of yarn.
(Note 2) The “calculated mass” of the woven fabric and canvas was determined from the equation.
Calculated mass = specific gravity of yarn × 100 ² × thickness (Note 3) “space occupancy of yarn (%)” means the space occupied by yarn in a woven fabric or canvas, and was obtained from the following equation.
Space occupancy of yarn (%) = (measured mass / calculated mass) × 100
(Note 4) “Void ratio” was determined from the following equation.
Porosity (%) = 100-Space occupancy of yarn (%)

<Measurement of friction coefficient>
Next, each friction coefficient of the nylon taffeta surface of Example 1 mentioned above and the canvas surface of the comparative example 1 was measured with a friction coefficient measuring apparatus (Haydon). Moreover, the friction coefficient was similarly measured about the resin surface (thermoplastic polyurethane surface) in Example 1 for reference. The measurement conditions are as follows.
Load converter quantity: 19.6133N
DSA amplifier range: 100%
Vertical load: 500 g
Sampling speed: 1 ms
The test results are shown in Table 2.

  As shown in Table 2, it can be seen that the coefficient of friction of the nylon taffeta surface of Example 1 is lower than the surface of the canvas of Comparative Example 1 for both the coefficient of kinetic friction (μs) and the coefficient of static friction (μk). In addition, in the resin surface of Example 1, since the frictional force is high, conveyance in the form which a resin surface slides on a table can not be performed.

<Comparison of physical contraction amount>
An endless flat belt was stretched between a drive pulley (diameter 55 mm) and a knife edge (curvature radius R of the tip: 3 mm) at an attachment elongation rate of 0.3%. Next, 10 ml of a coating material prepared by mixing flour and oil at 5: 3 was dropped onto the inner circumferential surface of the flat belt with a syringe. Next, it was rotated at a motor speed of 1200 rpm and a belt speed of 3.5 m / s for 10 minutes to rub the coating on the inner peripheral surface of the flat belt.
The flat belt was removed from the belt conveyor, the paint adhered to the inner circumferential surface was wiped off, and the circumferential length (L2) of the flat belt after the test was measured. Then, the shrinkage factor of the belt was determined from the initial circumferential length (L1) in the longitudinal direction before the test and the circumferential length (L2) after the test. The results are shown in Table 3.

  From Table 3, in Example 1 in which the inner peripheral surface of the belt is made of nylon taffeta, the belt does not shrink as compared with Comparative Example 1 in which the inner peripheral surface of the belt is made of canvas, and the belt has an effect of preventing shrinkage. Know that

  As described above, according to the present embodiment, by using a woven fabric having a specific thickness and porosity for the inner circumferential surface of the belt, abrasion of the oil, gravy, etc. of the powder or food from the inner circumferential surface of the belt Since the shrinkage is suppressed, the shrinkage of the flat belt is prevented, and the inner circumferential surface of the belt has a low coefficient of friction, so that the belt conveyor can be operated efficiently for a long time.

10 flat belt 20 core woven fabric 20A, 50A warp 20B, 50B weft 30 elastomer layer 40 resin layer 50 woven layer 100 belt conveyor 110 drive pulley 120 driven pulley 130 table 140 transported object

Claims (3)

Core woven fabric extending in the longitudinal direction of the belt;
An elastomer layer provided on one side of the core woven fabric,
And a woven fabric provided on the other side of the core woven fabric,
A flat belt characterized in that the woven fabric is a taffeta woven fabric having a thickness of 0.3 mm or less and a porosity of 70% or less.   The flat belt according to claim 1, wherein the woven fabric has a surface dynamic friction coefficient of 0.18 or less.   The flat belt according to claim 1 or 2, wherein the woven fabric has a surface static friction coefficient of 0.25 or less.

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