JP3613706B2 - Long object pulling belt and long object pulling device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt for pulling a long object for pulling a cable or a thin tubular body (long object), and a pulling device for a long object using the belt.
[0002]
[Prior art]
As a conventional long pulling belt, for example, there is a belt having a thick back portion and a soft rubber having a hardness of about 50 ° to 55 °.
[0003]
When towing a long object using this tow belt, two tow belts are stretched between the pulleys, and the back surfaces of both tow belts face each other so that the pulleys face each other. Are driven to rotate while the flat back surfaces are deformed following the outer shape of the long object.
[0004]
However, the traction belt has the following problems (1) and (2).
(1). Since the back part is a soft rubber having a hardness of about 50 ° to 55 °, the flat back surfaces are compressed and deformed in a state of being recessed in accordance with the outer shape of the long object when sandwiched and pulled. However, it is easy to meander in the middle of pinching towing, and stable towing work cannot be performed.
(2). In order to increase the traction force, the rubber constituting the back portion must be greatly deformed so as to be recessed following the shape of the long object, and therefore the rubber is cracked to the left and right in a relatively short period of time. This phenomenon is promoted when a long object meanders in the middle of pinching towing.
[0005]
Therefore, in the industry that handles this type of traction belt, a long traction belt that can perform stable traction work without meandering and has a long life, and a long traction device using the traction belt have been developed. I'm looking forward to it.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a long-sized traction belt that can perform stable traction work without meandering and has a long life, and a long-sized traction device using the traction belt.
[0007]
[Means for Solving the Problems]
(Invention of Claim 1)
The long object traction belt of the present invention is an endless traction belt for towing a long object having a circular cross section. The belt body forming the back part and the tooth part is made of rubber having a hardness of 60 ° to 85 °. The grip groove is configured to extend in the longitudinal direction of the belt on the back surface and into which a part of the long object is fitted when towed, and the canvas is embedded at a position deeper than the grip groove with respect to the back surface. The elongation of the back surface is set to 15% or less.
(Invention of Claim 2)
The long object traction device according to the present invention is constructed by stretching two long traction belts according to claim 1 between pulleys, and the back surfaces of the two traction belts on the forward side face each other. In this way, the long object is pulled by being sandwiched between the walls of the grip grooves formed on the back surfaces of the two pulling belts.
(Invention of Claim 3)
According to a long object traction device of the present invention, a single long object traction belt according to claim 1 is stretched between pulleys, and a plurality of rollers are provided in parallel with the back surface of the traction belt on the forward path side. The roller has a grip groove arranged around the roller, and a long object is sandwiched between the grip groove constituting wall of the traction belt and the grip groove constituting wall of the roller. Towing long objects.
[0008]
The operation and effect of the long object traction belt of the invention and the long object traction device using the belt will be described in the section of the embodiment of the invention below.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings shown as embodiments.
[0010]
FIG. 1 is a conceptual diagram of a long object traction device S according to an embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view showing a state in which a long object N is held by a traction belt B in the traction device S.
(About the configuration of the traction device S)
As shown in FIG. 1, the traction device S includes two traction belts B of a long object N that are stretched between pulleys P and P, and the back side of the traction belts B and B on the forward path side. The long objects N are pulled so as to be sandwiched between the constituent walls of the grip grooves 10 and 10 formed on the back surfaces of the pulling belts B and B. Therefore, in this traction device S, the two pulling belts B are synchronously rotated by rotationally driving the pulley P located on the left.
(About long material N)
The long object N includes a cable and a tubular body such as a thin tube. However, any object having a thin and flexible cross-sectional circular shape (including a substantially circular shape or a polygon) is included in the long object N. .
(About the configuration of the towing belt B)
As shown in FIG. 2, the pulling belt B is composed of a belt body 1, a tooth cloth 2, a core wire 3, and a canvas 4.
[0011]
As shown in FIG. 2, the belt body 1 is formed by forming a back part 11 and a tooth part 12 of styrene butadiene rubber having a hardness of 60 ° to 85 °, and other CR, HNBR, NBR, and a belt longitudinal direction on the back side. And a grip groove 10 into which a part of the long object is fitted when towed. The cross-sectional shape of the grip groove 10 is a radius slightly larger than the radius of the long object N, and its depth is smaller than the radius of the long object N (preferably 30 to 40% of the diameter of the long object N). ) The thickness of the back portion 11 is set to about 2 to 4 times the thickness of the tooth portion 12.
[0012]
The tooth cloth 2 is made of a nylon woven cloth formed by weaving nylon threads in an orthogonal manner, and covers the entire length of the tooth portion 12 in the longitudinal direction of the belt as shown in FIG.
[0013]
The core wire 3 is a glass fiber cord or an aramid cord, and is embedded in the belt body 1 so as to extend in the belt longitudinal direction as shown in FIG.
[0014]
The canvas 4 is made of a nylon woven fabric formed by weaving nylon yarns in an orthogonal manner. As shown in FIGS. 2 and 3, the canvas 4 is buried deeper than the grip groove 10 on the back surface. The canvas 4 has a function of preventing the back portion 11 from being bent in a state where the central portion is recessed, and a function of stopping the progress of cracks generated in the constituent walls of the grip groove 10.
[0015]
Further, in this traction belt B, the elongation percentage of the back surface of the belt is set to 15% or less. Here, the rate of elongation at the back of the belt (%) = (BP−P) / P × 100
It is represented by In the formula (1), BP is a belt back surface pitch and P is a tooth pitch.
[0016]
In the above formula (1), the belt back pitch is BP = (PD + 2BPLD) × π / N (2)
It is represented by In Equation (2), PD is the pulley pitch diameter, N is the number of pulley teeth, and BPLD is the back PLD.
[0017]
In the above formula (2), the back PLD is represented by BPLD = belt total thickness− (tooth height + theoretical PLD).
[0018]
Further, in this traction belt B, the elongation percentage of the back surface of the belt is set to 15% or less.
(About the function of the traction device S using the traction belt B)
(1). At the time of towing the long object N, as shown in FIGS. 1 to 3, the long object N fits into the grip grooves 10, 10 formed on the tow belts B and the configuration of the grip grooves 10, 10. It will be pinched by the wall. That is, the long object N is pulled while being guided by the grip grooves 10 and 10.
[0019]
The rubber forming the constituent walls of the grip groove 10 has a hardness of 60 ° to 85 °, which is considerably higher than the conventional one.
[0020]
Therefore, the long object N does not meander in the middle of towing, and stable towing work can be performed.
(2). The long object N is fitted into the grip groove 10 formed from the beginning, and the amount of compressive deformation of the constituent walls of the grip groove 10 during pulling is small. Therefore, even if the rubber forming the constituent wall of the grip groove 10 has a hardness of 60 ° to 85 °, the rubber does not break in a short period of time unlike the conventional one. And even if a crack occurs in the constituent wall of the grip groove 10 by the pulling operation, the crack stops at the canvas 4 and does not proceed any further.
[0021]
Therefore, the traction belt B has a long life.
(3). As described above, the amount of compressive deformation of the constituent wall of the grip groove 10 at the time of towing is small, but since the rubber has a hardness of 60 ° to 85 °, the clamping force to the long object N at the time of towing is relatively large. .
(4). Due to the presence of the canvas 4, the back portion 11 does not bend in a state where the center portion is recessed, so that the radius of curvature of the grip groove 10 does not depend on the set dimensions at the time of manufacture (when the back portion 11 is curved, the radius of curvature of the grip groove 10 is The diameter of the long object N may be smaller). Therefore, when the long object N fits into the grip groove 10 and when the long object N comes out of the grip groove 10, the constituent wall of the grip groove 10 Is not scraped off by the long object N.
(5). In this traction belt B, the elongation at the back of the belt is set to 15% or less, so it is clear that cracks are unlikely to occur as shown in FIG. The graph of FIG. 4 shows experimental values for the following traction belt B.
"Towing belt B and pulley on which this is stretched"
Belt pitch length: 1000mm
Belt tooth pitch: 8.00mm
Belt width: 20.0mm
Number of pulley teeth: 30-tooth pulley Pitch diameter: 70.39 mm
"Other conditions"
The above-described traction belt B is stretched between a pair of pulleys and is driven to rotate. The conditions at this time are as follows.
[0022]
Rotational speed: 2300 rpm, mounting tension: 240 N, travel time: 2000 hours Similar results were obtained even when the traction belt B of other dimensions was used and the conditions were slightly changed.
[Other Embodiments]
(1). The grip groove 10 of both traction belts B of Embodiment 1 can be V-shaped as shown in FIG. In this case, it is preferable that the amount of the long object N fitted into the grip groove 10 is 5% to 30% of the diameter of the long object N.
[0023]
The grip groove 10 of one traction belt B can be formed in an R shape, and the grip groove 10 of the other traction belt B can be formed in a V shape.
(2). As shown in FIGS. 6 and 7, the traction device S is stretched between a pulley P and a traction belt B of a single long object N, and is parallel to the rear side of the traction belt B on the forward path side. A plurality of rollers 5 are arranged opposite to each other, and a grip groove 50 is provided around the roller 5, and a long object N is formed between the constituent wall of the grip groove 10 of the traction belt B and the grip groove of the roller 5. The long object can be pulled so as to be sandwiched between 50 constituent walls. In this traction device S, the amount of the long object N fitted into the grip groove 10 is preferably 30% to 50% of the diameter of the long object N, and the back surface of the traction belt B and the outer periphery of the roller 5 The gap with the surface is preferably 30% to 50% of the diameter of the long object N.
[0024]
The grip groove 10 and the grip groove 50 can be V-shaped.
[0025]
Further, one of the grip groove 10 and the grip groove 50 can be R-shaped and the other can be V-shaped.
[0026]
【The invention's effect】
Since the present invention is configured as described above, it has the following effects.
[0027]
As is clear from the contents of the embodiments of the present invention, a long tow belt that can perform stable towing work without meandering and has a long life, and a long object towing device using the tow belt Can provide.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a long object traction device according to Embodiment 1 of the present invention;
FIG. 2 is a cross-sectional perspective view showing a state in which a long object is held by a traction belt in the traction device.
FIG. 3 is a cross-sectional view showing a state in which a long object is held by the pulling belt.
FIG. 4 is a graph showing the relationship between the crack occurrence time and the backside elongation of the traction belt.
FIG. 5 is a cross-sectional perspective view showing a state in which a long object is held by a traction belt according to another embodiment.
FIG. 6 is a conceptual diagram of a long object traction device according to another embodiment of the present invention.
FIG. 7 is a cross-sectional perspective view showing a state in which a long object is held between a pulling belt and a roller in the pulling device.
[Explanation of symbols]
S Towing device B Towing belt N Long object 1 Belt body 2 Tooth cloth 3 Core wire 4 Canvas 5 Roller 10 Grip groove 11 Back part 12 Tooth part 50 Grip groove

Claims (3)

In an endless towing belt for towing a long object having a circular cross section, the belt main body forming the back portion and the tooth portion is made of rubber having a hardness of 60 ° to 85 °, extending on the back surface in the longitudinal direction of the belt and towing. A grip groove into which a part of a long object is sometimes fitted is formed, and a canvas is buried deeper than the grip groove with respect to the back surface, and the stretch rate of the belt back surface is set to 15% or less. A belt for towing long objects characterized by being. The two long traction belts according to claim 1 are stretched between pulleys, and the back surfaces of the two traction belts are opposed to each other. A traction device for a long object, wherein the traction device is pulled by being sandwiched by a wall of a grip groove formed on a back surface of the belt. A single long traction belt according to claim 1 is stretched between pulleys, and a plurality of rollers are rotatably arranged opposite to each other in parallel with the rear surface of the traction belt on the forward path side. A grip groove is provided around, and the long object is pulled by sandwiching the long object between the grip groove constituting wall of the pulling belt and the grip groove constituting wall of the roller. Towing device for long objects.

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