JP4587093B2 - Trunk weight - Google Patents

Description

【００１６】
これにより、錘を速く沈めるためには、重力を大きくし、浮力を小さくし、抗力を小さくすることが必要である。そのためには、錘の重さを大とし、体積を小とし、さらに沈降速度ｖをより速くするため、抗力係数、投影面積を小さくする必要がある。
【００１７】
錘は一定の距離を過ぎると、等速運動で沈降する。この時の速度を終末速度ｖ_∞といい、運動方程式のｄｖ／ｄｔ＝０として求める。これを［数２］に示す。
【００１８】
【数２】

【００１９】
沈降開始から終末速度ｖ_∞に至るまでの速度、即ち、沈降速度ｖは［数３］により求められる。
【００２０】
【数３】

【００２１】
終末速度に達するまでの沈降距離ｚは［数４］により求める。
【００２２】
【数４】

【００２３】
終末速度に達するまでの時間ｔは［数５］により求める。
【００２４】
【数５】

【００２５】
今質量ｍ：０．５７［ｋｇ］、体積０．００００５５［ｍ³］、代表長さｄ：０．０３８［ｍ］の錘を、本願発明のように形成した錘ｘと、図９のように下端部を稜線状にした錘ｙに形成する。両者の終末速度ｖ_∞、終末速度に達するまでの沈降距離ｚ及び同所要時間ｔを計算すると表１の通りとなる。ただし、錘の密度σ、投影面積Ａ及び諸物性値は次の通りである。
密度σ：ｍ／ｖ＝１０３７０［ｋｇ／ｍ³］
投影面積Ａ：πｄ²／４＝０．００１１３［ｍ²］
重力加速度ｇ：９．８［ｍ／ｓ²］
抗力係数Ｃ_D：ｘ＝０．０９、ｙ＝０．１６
海水密度ρ：１０３０［ｋｇ／ｍ³］
重力Ｖσｇ：ｘ＝５．６ｋｇ・ｍ／ｓ²、ｙ＝５．６ｋｇ・ｍ／ｓ²
浮力Ｖρｇ：ｘ＝０．６ｋｇ・ｍ／ｓ²、ｙ＝０．６ｋｇ・ｍ／ｓ²
抗力Ｃ_DＡ（ρ／２）ｖ²：ｘ＝５．０ｋｇ・ｍ／ｓ²、ｙ＝５．０ｋｇ・ｍ／ｓ²
レイノルズ数Ｒｅ＝ρｖｄ／η：ｘ＝３．５×１０⁵、ｙ＝２．６×１０⁵
【００２６】
【表１】

【００２７】
また沈降距離と沈降速度ｖとの関係を図７に、沈降距離と時間ｔとの関係を図８に各示す。
【００２８】
表１並びに図７及び図８から明らかなように、本願発明による胴突き錘の方が図９のような従来の胴突き錘より大なる終末速度ｖ_∞を得ることができ、これにより水深到達時間も早くなるのである。しかもこの水深到達時間は沈降距離ｚの大小にかかわらず早いのである。よって、錘が早く沈降するので漁獲効率の向上に資する効果がある。
【００２９】
また扁平面３ａ、３ｂを軸線Ａに対し内傾斜して形成したから、図２に示すように、舷１３に置いたとき扁平面３ａ、３ｂ全面が舷１３に接するため安定する。よって、船が揺れても錘は転がり難くなり、錘が仕掛け６に絡まることを防止する。これにより漁撈効率が向上する。
【００３０】
さらに沈降速度が早くなるので、錘の重さを比較的軽くすることができ、その分錘が扱いやすくなる。この面からも漁撈効率が向上する。
【００３１】
本願発明による胴突き錘は上記した実施の形態に制限されない。例えば、扁平面３ａ、３ｂを含め錘本体１Ａの全体形状は本願発明の特徴に反しない限り任意である。具体的には、例えば、いわゆる六角型と呼ばれるような比較的ずんぐりしたタイプのものであってもよい。また、錘の長さ、巾、奥行の寸法は任意に設計可能である。
【００３２】
【発明の効果】
このように、本願発明による胴突き錘によれば、操業時大なる沈降速度で沈降することができ、しかも非操業時において安定性が大であるという効果がある。よって、漁獲効率を向上せしめるとともに漁撈効率も向上し釣果の向上を図ることができる。
【図面の簡単な説明】
【図１】本願発明による胴突き錘の実施の形態を示す正面図である。
【図２】本願発明による胴突き錘の実施の形態を示す側面図である。
【図３】胴突き釣りの仕掛けの構成を示すとともに、本願発明による胴突き錘の適用例を示す図である。
【図４】仕掛けの設置状況を示す図である。
【図５】本願発明にかかる胴突き錘のコンピュータシュミレーションにより水流テストした結果を示す図である。
【図６】本願発明にかかる胴突き錘のコンピュータシュミレーションにより水流テストした結果を示す図である。
【図７】本願発明による胴突き錘と従来の胴突き錘とによる沈降距離と沈降速度ｖとの関係を示す図である。
【図８】本願発明による胴突き錘と従来の胴突き錘とによる沈降距離と時間との関係を示す図である。
【図９】従来の同種型の錘を示す側面図である。
【符号の説明】
１ 胴突き錘
１Ａ 錘本体
２ 上部
３ 下部
３ａ 扁平面
３ｂ 扁平面
３ｃ 下端部
３ｄ 側面
４ 上端部
４ａ 点
５ 吊環
６ 仕掛け
７ 幹糸
９ 鉤素
１１ 鉤
１３ 舷
Ａ 軸線
１０１ 胴突き錘
１０２ 上部
１０３ 下部
１０３ａ 扁平面
１０３ｂ 扁平面
１０３ｃ 下端部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a trunk weight used for trunk fishing.
[0002]
[Prior art]
Cylindrical fishing is a fishing method in which a weight is attached to the lowermost end, and a number of rods are attached to a portion of the trunk thread (Mikiito) 7 for fishing. It is the barrel weight that is used for this.
[0003]
The device for fishing for the body is tailored by combining the main thread 7, silicon 9, rod 11, weight 1, etc. according to the target fish (see FIG. 3). The sedimentation resistance tends to increase. In this type of fishing method, it is necessary to submerge the device quickly without failing to improve the fishing results.
[0004]
A conventional barrel weight 101 is as shown in FIG. 9, and the lower flat surface 103a is parallel to the axis A, and the lower end portion 103c is formed in a ridge shape so as to be easily settled in seawater. At the same time, the side surface of the lower end portion 103 and the side surface of the upper portion 102 are formed to be ridged in a square shape.
[0005]
However, in such a case, since there are only two points of contact M and N when placed on the anchor 13 of the ship S, stability is lacking.
[0006]
Further, when the weight 101 is rolled when the ship is shaken, there is a drawback that the weight 101 is entangled with the device and the fishing efficiency is greatly reduced.
[0007]
Furthermore, since the shape of the lower end portion 103c is angular in the shape of a ridgeline, there is a drawback that a vortex flow is generated along with the settling, thereby significantly reducing the settling speed. If the sinking of the weight is slow, the ship always moves with the flow of the tide, so even if you try to catch the fishing point, it will be off the point where the fish school is located, and the fishing efficiency will be greatly reduced.
[0008]
[Problems to be solved by the invention]
The object of the present invention is to eliminate the above-mentioned drawbacks, to provide a barrel weight having a high sedimentation speed and high stability, and to improve fishing results.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the barrel weight according to the present invention is a barrel weight in which the shape of the weight body is formed in a divergent shape toward the lower part, and the lower part is formed enormously from the upper part and the lower end part is formed in a curved shape. A pair of flat surfaces are provided opposite to a part of the peripheral surface only at the lower part, and an extension of the flat surface is inclined at an inner inclination angle θ so as to contact the outer peripheral part of the upper end of the weight. Features.
Moreover, the trunk | drum weight of Claim 1 WHEREIN: A gravity center is set | placed on the said lower part, It is characterized by the above-mentioned .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the trunk weight according to the present invention will be described in more detail based on the embodiment shown in the drawings. For convenience, portions having the same function are denoted by the same reference numerals and description thereof is omitted.
[0011]
As shown in FIGS. 1 and 2, the trunk weight 1 is composed of a weight main body 1 </ b> A formed in a vertically long substantially trapezoidal shape, and an upper portion 2 is formed in a diverging bar shape and a lower portion 3 is enormously formed. The lower part 3 forms a part of the front and back surfaces on the flat surfaces 3a and 3b, and forms a lower end part 3c and a side surface 3d in a curved shape. The flat surfaces 3a and 3b are formed to incline with respect to the axis A at an inclination angle θ. Specifically, the flat surfaces 3a and 3b are formed so as to be inclined inward along a line connecting the flat surfaces 3a and 3b and the point 4a of the upper end portion 4. The center of gravity G of the weight main body 1A adjusts the degree of enlargement of the lower part 3 so as to be placed on the lower part of the flat surfaces 3a and 3b. The upper end portion 4 of the weight main body 1A is formed in a curved surface shape. Reference numeral 5 denotes a hanging ring for attaching to the trunk thread 7.
[0012]
The trunk weight 1 is attached to a device 6 having a configuration as shown in FIG. That is, the device 6 is formed by connecting a large number of ridges 11 to the trunk thread 7 through silicon 9. The configuration of the device 6 is variously changed according to the fish species to be fished. As shown in FIG. 4, a large number of trunk yarns 7 and reeds 11 having the device 6 and the trunk weight 1 are hung from the ship S and placed on a reed 13 during non-operation.
[0013]
In the body weight 1 according to the above-described embodiment, the flat surfaces 3a and 3b are formed inwardly inclined along a line connecting the flat surfaces 3a and 3b and the one point 4a of the upper end portion 4, and the lower end portion 3c is curved. Therefore, as shown in FIGS. 5 and 6, the flow of water becomes smooth during settling, so that there is no so-called separation phenomenon and no vortex is generated. For this reason, no negative pressure is generated at the upper end portion 4, and the resistance of water is reduced. Therefore, a large sedimentation speed can be obtained, and sedimentation is fast. This has the effect of improving fishing efficiency.
[0014]
This point will be described in detail below. In assumed not affected by the ocean currents, when to drop the weight in seawater, the force acting on the weight is the "gravity Vσg""buoyancyVρg""drag _{C D A (ρ / 2)} v 2 " There are three types. When the equation of motion is established, the acceleration m · (dv / dt) in the sinking motion of the weight is as shown in [Formula 1].
[0015]
[Expression 1]

[0016]
Thus, in order to sink the weight quickly, it is necessary to increase gravity, reduce buoyancy, and reduce drag. For this purpose, it is necessary to reduce the drag coefficient and the projected area in order to increase the weight of the weight, reduce the volume, and further increase the sedimentation speed v.
[0017]
After a certain distance, the weight sinks with a constant velocity. The speed at this time is referred to as an end speed v _∞, and is obtained as dv / dt = 0 in the equation of motion. This is shown in [Formula 2].
[0018]
[Expression 2]

[0019]
Speed from the start settling down to terminal velocity v _∞, i.e., sedimentation rate v is determined by the equation (3).
[0020]
[Equation 3]

[0021]
The settling distance z until reaching the terminal velocity is obtained by [Equation 4].
[0022]
[Expression 4]

[0023]
The time t until the terminal speed is reached is obtained by [Equation 5].
[0024]
[Equation 5]

[0025]
A weight x having a mass m: 0.57 [kg], a volume 0.000055 [m ³ ], and a representative length d: 0.038 [m] formed as in the present invention, and a weight x as shown in FIG. The lower end is formed into a weight y having a ridge shape. When the terminal velocity v _{∞ of} both, the settling distance z to reach the terminal velocity, and the required time t are calculated, Table 1 is obtained. However, the density σ of the weight, the projected area A, and various physical property values are as follows.
Density σ: m / v = 10370 [kg / m ³ ]
Projection area A: πd ² /4=0.00113 [m ² ]
Gravity acceleration g: 9.8 [m / s ² ]
Drag coefficient C _D : x = 0.09, y = 0.16
Seawater density ρ: 1030 [kg / m ³ ]
Gravity Vσg: x = 5.6 kg · m / s ² , y = 5.6 kg · m / s ²
Buoyancy Vρg: x = 0.6 kg · m / s ² , y = 0.6 kg · m / s ²
Drag C _D A (ρ / 2) v ² : x = 5.0 kg · m / s ² , y = 5.0 kg · m / s ²
Reynolds number Re = ρvd / η: x = 3.5 × 10 ⁵ , y = 2.6 × 10 ⁵
[0026]
[Table 1]

[0027]
FIG. 7 shows the relationship between the settling distance and the settling velocity v, and FIG. 8 shows the relationship between the settling distance and time t.
[0028]
As can be seen from Table 1 and FIGS. 7 and 8, the barrel weight according to the present invention can obtain a terminal velocity v _∞ greater than the conventional barrel weight as shown in FIG. It will be faster. Moreover, the water depth arrival time is quick regardless of the settling distance z. Therefore, since the weight sinks quickly, there is an effect that contributes to improvement of fishing efficiency.
[0029]
Further, since the flat surfaces 3a and 3b are formed so as to incline inward with respect to the axis A, as shown in FIG. Therefore, the weight is difficult to roll even if the ship is shaken, and the weight is prevented from being entangled with the device 6. This improves fishing efficiency.
[0030]
Furthermore, since the sedimentation speed becomes faster, the weight of the weight can be made relatively light and the weight can be handled easily. This also improves fishing efficiency.
[0031]
The trunk weight according to the present invention is not limited to the above-described embodiment. For example, the overall shape of the weight main body 1A including the flat surfaces 3a and 3b is arbitrary as long as it does not contradict the characteristics of the present invention. Specifically, for example, a so-called hexagonal type may be used. Further, the length, width, and depth of the weight can be arbitrarily designed.
[0032]
【The invention's effect】
As described above, according to the barrel weight according to the present invention, it is possible to settle at a large settling speed during operation, and there is an effect that stability is large during non-operation. Therefore, it is possible to improve fishing efficiency and fishing efficiency by improving fishing efficiency.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a barrel weight according to the present invention.
FIG. 2 is a side view showing an embodiment of a barrel weight according to the present invention.
FIG. 3 is a diagram showing a configuration of a device for fishing for a trunk but also shows an application example of a barrel thrust according to the present invention.
FIG. 4 is a diagram showing a device installation state.
FIG. 5 is a diagram showing a result of a water flow test by computer simulation of a barrel weight according to the present invention.
FIG. 6 is a diagram showing a result of a water flow test by computer simulation of a barrel weight according to the present invention.
FIG. 7 is a diagram illustrating a relationship between a settling distance and a settling velocity v between a barrel thruster according to the present invention and a conventional barrel thruster.
FIG. 8 is a diagram showing a relationship between a settling distance and time by a barrel thruster according to the present invention and a conventional barrel thruster.
FIG. 9 is a side view showing a conventional weight of the same type.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body thrust weight 1A Weight main body 2 Upper part 3 Lower part 3a Flat surface 3b Flat surface 3c Lower end part 3d Side surface 4 Upper end part 4a Point 5 Suspension ring 6 Mechanism 7 Trunk thread 9 Element 11 鉤 13 舷 A Axis 101 Body protrusion weight 102 Upper part 103 Lower part 103a Flat surface 103b Flat surface 103c Lower end

Claims (2)

In the body weight which is formed in a shape in which the shape of the weight main body is widened toward the bottom, the lower part is enormously formed from the upper part and the lower end part is formed in a curved shape, and a pair of peripheral surfaces is formed only on the lower part. A cylinder weight having an inclining angle provided at an inner inclination angle θ so that the flat surfaces are opposed to each other and an extension line of the flat surface is in contact with the outer peripheral portion of the upper end of the weight. In Dozuki weight according to claim 1, Dozuki weight, characterized in that placing the center of gravity to the bottom.

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