JPH0564113U - Antistatic conveyor belt - Google Patents

Abstract

(57) [Abstract] [Purpose] Non-conductive conductive fibers that make up a part of the weaving yarn that weaves the canvas arranged on the non-conveying surface side of the traveling conveyor belt in sliding contact with the table / roller group. Cover with fiber as much as possible to reduce the exposed surface area of conductive fiber,
The purpose of the present invention is to suppress the abrasion and cutting of the conductive fiber portion, thereby grounding the electrostatic charge voltage generated during the sliding contact running of the belt, and ensuring the low charge voltage of the belt. [Structure] A covering thread (8) formed by twisting a conductive fiber (6) and a non-conductive fiber (7) together with a part of a woven thread for weaving a core canvas which is a constituent member of a conveyor belt. A non-conductive fiber yarn (9) thicker than the covering yarn (8) is further twisted to form a plied yarn (10).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an antistatic conveyor belt, which is a conveyor belt that travels in constant contact with a table or a group of support rollers, in which a body fabric is arranged as one component of the belt, and the cloth is woven. The present invention relates to a conveyor belt in which a conductive fiber is arranged in a part of the fiber yarn to be manufactured so that the electrostatic voltage accumulated in the belt main body is grounded and can be kept at a constant low level at least at all times.

[0002]

[Prior Art]

 Conveyor belts that run on the non-conveying surface side of the belt, always in contact with or supported by the table or roller group, have static electricity accumulated in the belt body due to sliding friction with these members. The accumulation and rise of the voltage is caused by the detection of metallic substances mixed in the transported object using the metal detector, and during the transportation of food, the presence of static electricity in the belt causes the adhesion of dusts. Static electricity becomes a major obstacle in terms of maintaining the quality of electronic parts when promoting electronic parts and transporting electronic parts.

[0003] Conventionally, in order to eliminate the harmful effects of accumulating and increasing the electrification voltage of a conveyor belt, an example of which is shown above, a variety of conductive members are arranged in the constituent members of the conveyor belt. Means have been proposed. For example, as a first example, a part of a conveyor belt is configured, and a conductive resin or a conductive rubber material is impregnated into the core body cloth arranged on the non-conveying surface side, or the surface of the cloth is attached. As a second example, a part of a conveyor belt is formed, and conductivity is imparted to the adhesive layer existing between the multiple layers of the core body fabric layers arranged on the non-conveying surface side of the conveyor belt. Conveyor side Covered cover layer that is entirely mixed with powdery or granular conductive material, and as a fourth example, a core canvas that forms part of the conveyor belt and is arranged on the non-conveyor side of the belt. The woven yarn itself includes a mixture of conductive fibers.

As the weaving yarn for weaving the body canvas used in the fourth example, specifically, conductive fibers and non-conductive fibers are simply twisted (see FIG. 8), or non-conductive A core yarn was used in which a conductive fiber was spirally wound around the fiber as the core. A specific example of the woven yarn (21) shown in FIG. 8 is a ply-twisted yarn obtained by simply twisting 1000 denier polyester multifilaments (22) and 30 denier carbon conductive fibers (23). However, all of these woven yarns have good conductivity, but the exposed amount of the conductive fibers that make up the woven yarn is extremely large, and the conductive fibers are severely cut and abraded by that amount. Instability and uncertainty in terms of conductivity tended to increase.

[0005]

[Problems to be solved by the device]

 Each of the above-mentioned various means for arranging the conductive member in the constituent members of the conveyor belt has advantages and disadvantages, and the drawbacks of each of these means are, in the first example, easy to get dirty in the manufacturing process, and If it is used at the cut edge, the aesthetic appearance of the product itself will be greatly impaired. Next, in the second example, the manufacturing man-hour is increased as a whole. Also, in the third example, the conductive substance itself to be mixed in is expensive, and as a result, the cost of the product itself is high. In addition, the fourth example is the most effective in terms of maintaining a constant level of charged voltage with the conductive material, but when the belt is running, the sliding contact wear with the table roller is large, and As a result, the running band voltage becomes unstable and uncertain, as mentioned above, and the conveyor belt made up of each of these configuration examples has its own problems.

This invention basically adopts the technical idea shown in the fourth example, which is most effective for ensuring a certain level of conductivity and charged voltage, that is, it is arranged on the non-conveying surface side of the conveyor belt. The woven yarns that make up the core body fabric have been devised to partially protect the conductive members that were partially adopted for the woven yarns that make up the body fabric, which makes direct contact with the table / roller group. Efficiently removes abrasion and cutting phenomenon of conductive fibers, and further eliminates cutting and fraying of conductive fibers in the process of sail weaving and twisting, making it a more effective anti-static conveyor belt. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the antistatic conveyor belt according to the present invention has the following structure. The antistatic conveyor belt according to the first aspect of the invention is one in which all or part of at least one of the warp threads and the weft threads for weaving the core canvas as one component of the belt is electrically conductive. It is characterized in that it is composed of a covering yarn formed by twisting a conductive fiber and a non-conductive fiber together, and a twisted yarn formed by further twisting a non-conductive fiber yarn several steps thicker than this covering yarn. To do.

Further, in an antistatic conveyor belt according to another invention, a part of the weaving yarn also used for weaving the core body cloth is spirally wound around the core yarn made of conductive fibers. It is characterized in that it is composed of a wound core yarn.

[0009] In an antistatic conveyor belt according to still another aspect of the invention, a part of the weaving yarn also used for weaving the core body cloth is surrounded by a non-conductive fiber and a non-conductive fiber and a conductive fiber. It is characterized in that it is composed of a core yarn formed by spirally winding a covering thread made by twisting and.

[0010]

【Example】

 Next, a specific embodiment of the antistatic conveyor belt according to the present invention will be described with reference to the drawings. The conveyor belt (1) shown in cross section in FIG. 1 in which the present invention is implemented comprises a core body cloth (2) arranged on the non-conveying surface side and a rubber or synthetic resin elastic member arranged on the surface thereof. It is composed of a laminated body of elastic covering layers (3) composed of a body. As shown in FIGS. 2 and 3, all or a part of one of the warp threads (4) and the weft threads (5) for weaving the core body canvas (2) is non-conductive with the conductive fibers (6). A ply-twisted yarn obtained by further ply-twisting a covering thread (8) obtained by plying a conductive fiber (7) and a non-conducting multifilament thread (9) several steps thicker than the covering thread (8). The probability that the conductive fiber (6) is exposed on the surface of the woven yarn and exposed on the surface of the plied yarn (10) is extremely reduced. This minimizes the exposure of the conductive fibers (6) to the belt non-conveying surface side of the canvas (2).

As another embodiment, all or part of one or both of the warp yarn (4) and the weft yarn (5) for weaving the core canvas (2) arranged on the non-conveying surface side of the conveyor belt is shown in FIG. As shown in FIG. 5 and around the core yarn (11) made of the conductive fiber (6), in other words, with the core yarn (11) as the core portion, the core yarn (11) is thicker than the core yarn (11) by several steps. A multi-filament outer peripheral thread (12) made of a non-conductive fiber (7) is spirally wound into a core yarn (13), whereby a core thread (11) made of a conductive fiber (6) is formed. Is not exposed at all on the surface of the woven yarn, and completely prevents the conductive fiber (6) from being exposed on the non-conveying surface side of the belt in the canvas (2).

As yet another embodiment, all or part of one or both of the warp yarn (4) and the weft yarn (5) for weaving the core canvas (2) forming a part of the conveyor belt is as shown in FIG. As shown in FIG. 7 and FIG. 7, a conductive fiber (6) and a non-conductive fiber are provided around the core yarn (14) made of the non-conductive fiber (7), in other words, with the core yarn (14) as a core portion. It is composed of a core yarn (15) formed by spirally winding a covering yarn (8) obtained by plying (7) with the conductive yarn (6), which allows the conductive fiber (6) to be seen and hidden on the surface of the weaving yarn. The probability that the surface of the core yarn (15) is exposed is reduced, which suppresses the exposure of the conductive fiber (6) to the non-conveying surface side of the belt of the canvas (2) as much as possible.

As the conductive fibers (6) which compose a part of the weaving yarn of the canvas (2), there are carbon fibers and conductive synthetic fibers, and as the non-conductive fibers (7), polyester, nylon, Examples include synthetic fibers such as vinylon and aromatic polyamide fibers, and natural fibers such as rayon. Although carbon fiber can be mentioned as a typical example of the conductive fiber (6), since this carbon fiber is very brittle and inferior in flexibility, it cannot withstand the use of carbon fiber alone. By entwining the non-conductive fiber (7) to cover the inferiority, it is possible to suppress the local abrasion and cutting phenomenon at the center of the conductive fiber part.

Next, to disclose more detailed specific examples of the respective weaving yarns shown in FIGS. 2 to 7 for weaving the core canvas (2) of the conveyor belt (1), first, FIG. 2 and FIG. The twisted yarn (10) shown as No. 3 is a covering yarn (8) obtained by twisting 30 denier carbon conductive fibers (6) and 30 denier polyester non-conductive fibers (7). And a non-conductive yarn (9) made of 1000 denier polyester multifilament.

Next, the core yarn (13) shown in FIGS. 4 and 5 has 500 to 1500 around the core yarn (11) of the core monofilament made of carbon conductive fiber of 50 to 200 denier as the core portion. A denier polyester non-conductive multifilament outer peripheral thread (12) is spirally wound.

The core yarn (15) shown in FIGS. 6 and 7 has a conductive layer made of carbon of 30 denier around the core thread (14) of the non-conductive polyester core monofilament of 50 to 200 denier as the core. A covering ring (8) obtained by ply-twisting a conductive fiber (6) and a polyester non-conductive fiber (7) having a denier of 30 denier is wound in a spiral shape.

The weft yarn (5), which is the other weaving yarn for weaving the canvas (2), is used as the weft yarn (4) of the canvas (2) when the weaving yarn partially containing the conductive fibers (6) is used as the warp yarn (4). An example of a fabric which is composed of 600 d / 1 monofilament non-conductive polyester fiber yarn and which uses the plied yarn shown in FIGS. 2 and 3 as a warp (2) is 1000 d / 1 × 600 d / 1 ────────────────, the warp yarn (4) is 1000 denier of non-conductive yarn (9) consisting of 70 × 50 multifilament made of polyester 70 × 50 and carbon of 30 denier. A covering yarn (8) obtained by twisting a covering fiber (8) obtained by twisting a conductive fiber (6) made of polyester and a conductive fiber made of polyester (7) of 30 denier, and a weft yarn (10). 5) is a 600 denier polyester non-conductive material It is constituted by sexual monofilament yarns, 5cm per warp 70 yarns, Traction canvas and also with weaving density of 5cm per weft 50 lines (2) is woven.

Next, a conveyor belt (hereinafter referred to as an example) using a canvas (2) woven using a part of the woven yarn shown in FIGS. 2 and 3 and a conventional belt shown in FIGS. 8 and 9 is used. A conveyor belt (hereinafter referred to as a comparative example) having the same structure as that of the example is used by using a canvas woven using a part of the woven yarn that has been installed Was measured. As the electrification voltage measuring instrument, a commercially available statylon measuring instrument with an allowable range of 0 to 50000V is used, and the belt running test conditions for the experiment are as follows: belt speed 150 m / min, pulley diameter 30 mm, measurement after continuous running for 100 hours. Is. As a result, the amount of abrasion of the belt was 130 mg in the example and 133 mg in the comparative example, and there was almost no difference between them. Further, the running voltage was 200 V in the example and 500 V in the comparative example, and it was confirmed that the example had a charging voltage discharge effect of about 2.5 times.

[0019]

[Effect of the device]

 The conveyor belt according to the present invention comprises a part of the weaving yarn for weaving the core canvas which is arranged on the non-conveying surface side of the conveyor belt which is always in sliding contact with the table / roller group, and the conductive fiber having the non-conducting fiber yarn. When the conveyor belt runs in sliding contact with a table or a group of rollers by covering it in a wide area by spiral winding or a twisting means using a covering thread, the abrasion and cutting of conductive fibers due to sliding friction can be prevented. The danger can be greatly removed, and the static electricity generated during the sliding contact of the belt can be discharged evenly across the entire belt voltage accumulated in the belt body, and the belt voltage can be lowered to a low level. It can be maintained at all times and can greatly contribute to the control of the charged voltage due to static electricity generated on the conveyor belt when it is running. This makes it possible, for example, to effectively eliminate the adhesion of dust particles to articles being transported due to static electricity, or to eliminate the occurrence of various troubles due to static electricity to electronic components during transportation, thus maintaining high quality of the parts. In order to eliminate the harmful effects of static electricity that occurs, this device can fully meet the various requirements of conveyor belts.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a conveyor belt embodying the present invention.

FIG. 2 is a front view of a part of the conductive fiber yarn (plied yarn) for weaving the body canvas used in the present invention.

FIG. 3 is an enlarged cross-sectional view of the plied yarn shown in FIG.

FIG. 4 is a front view of a part of a conductive fiber yarn (core yarn) showing another embodiment.

5 is an enlarged cross-sectional view of the core yarn shown in FIG.

FIG. 6 is a front view of a part of a conductive fiber yarn (core yarn) showing still another embodiment.

7 is an enlarged cross-sectional view of the core yarn shown in FIG.

FIG. 8: Conductive fiber yarn (plied yarn) for woven conventional canvas
It is a front view of a part of.

9 is an enlarged cross-sectional view of the plied yarn shown in FIG.

[Explanation of symbols]

 1 Conveyor Belt 2 Core Body 4 Warp 5 Weft 6 Conductive Fiber 7 Non-Conductive Fiber 8 Covering Yarn 9 Non-Conductive Thread 10 Combined Twist 11 Conductive Core Yarn 12 Peripheral Thread 13 Core Yarn 14 Non-conductive Core Yarn 15 Core Yarn

Claims (3)

[Scope of utility model registration request] 1. A warp yarn or a weft yarn for weaving a core canvas as a constituent member of a conveyor belt, wherein all or part of at least one of the weft yarn groups is made of conductive fibers and non-conductive fibers. An antistatic conveyor belt comprising: a covering yarn formed by twisting together a non-conductive fiber yarn that is several steps thicker than the covering yarn, and a twisted yarn formed by twisting the covering yarn. 2. A warp yarn or weft yarn for weaving a core canvas as a constituent member of a conveyor belt, wherein all or part of at least one of the weaving yarns is surrounded by a core yarn made of a conductive fiber. An antistatic conveyor belt comprising a core yarn formed by spirally winding non-conductive fibers around. 3. A warp yarn or weft yarn for weaving a core canvas as a constituent member of a conveyor belt, wherein all or part of at least one of the weaving yarns is a core yarn made of a non-conductive fiber. An antistatic conveyor belt comprising a core yarn formed by helically winding a covering thread formed by twisting a non-conductive fiber and a conductive fiber around the periphery.