JP2010228170A - Method and device for correcting bend of bamboo material - Google Patents
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本発明は、生産性に優れ、且つ圧潰割れのない竹材の曲がり矯正方法及びその装置に関する。 The present invention relates to a method and an apparatus for correcting a bending of a bamboo material that is excellent in productivity and has no crushing cracks.
森林資源の保全とそれから得られるバイオマスの有効活用は、二酸化炭素の吸収・低減、その発生場所の周辺地域の振興と利便性向上の一助にもなり、周辺地域に止まらず、地球規模の環境保全、資源保全の上から極めて望ましいことである。 Conservation of forest resources and the effective use of biomass obtained from them contributes to the absorption and reduction of carbon dioxide, the promotion of the surrounding area where it occurs, and the improvement of convenience. It is extremely desirable from the viewpoint of resource conservation.
しかしながら、バイオマスのうち、竹は稲科植物に属し、一般の樹木に比較して繁殖力が旺盛で、４〜５年で成竹となり、１０年間で２倍以上に拡がり、近年それに対する需要が減少しているため、荒れるままに放置された竹林域が増大し、他の樹林や畑を侵食さえしていると言う問題点がある。従って、それの計画的な伐採利用は、上記効果に加えて、地域の雇用確保、活性化、過疎化の抑制を、長期にわたって図る一助にもなり得る。 However, among the biomass, bamboo belongs to the rice plant, and its fertility is thriving compared to ordinary trees. It grows in 4-5 years and grows more than twice in 10 years. Due to the decrease, the bamboo forest area left untouched is increasing, and there is a problem that it is eroding other forests and fields. Therefore, in addition to the above effects, the planned use of logging can help to secure, activate, and control depopulation in the region over the long term.
竹材の用途は、一般的に日本建築の装飾用や造園用、垣根、遮断機等があるが、伐採された竹材は節の部分で鈍角に屈曲していることが多く、そのまま使用すると特に装飾用や垣根等は、並べた時に隙間が生じ商品価値が低下するため、その曲りを矯正する必要がある。その竹材の曲がりの矯正には、従来図４に示すような「かんてき」という、木製の梃子治具Ｌｅを用いる手動工法が存在する。これは、一本の竹材１の、ここと思われる箇所を、バーナー等で局所的に焦げ目が付かない程度に加熱し、前記梃子治具Ｌｅと大腿Ｔとによって支持し、梃子治具Ｌｅの他の一点に集中荷重を加え、曲がり部分を逆曲げすることによって全体の姿を真直に見えるように矯正する方法である。 Bamboo materials are generally used for decoration, landscaping, fences, barriers, etc. in Japanese architecture, but the harvested bamboo materials are often bent at an obtuse angle at the knots. Since the use and fences have gaps when they are arranged and the product value is lowered, it is necessary to correct the bending. In order to correct the bending of the bamboo material, there is a manual method using a wooden lever jig Le called “Kan-chi” as shown in FIG. This is because the portion considered to be here is heated by a burner or the like so as not to be locally burnt, and is supported by the above-mentioned lever jig Le and thigh T. It is a method of correcting the whole figure so that it looks straight by applying concentrated load to another point and bending the bent part in reverse.
この方法は熟練者によれば、長さ４ｍ、直径３０〜５０ｍｍ程度の細い竹材の場合、１本あたりの修正個所は３〜１０箇所程度であり、１時間に１０〜１５本程度の曲がり矯正処理が可能である。1日８時間作業した場合、８０〜１２０本程度矯正処理される計算になるが、実際は、この作業は力を必要とし重労働であるため、継続的に行うのは熟練者であっても困難であり、平均すると８０本程度となる。仮に非熟練者が作業した場合、まず真直にするのは困難である。なぜならば、熟練者は、これまでの長い経験により、竹材の曲がり具合、竹材の堅さ、節間の長さ（節と節の間の長さ）、竹材の重量、等々の要素から加熱具合、曲げ具合を瞬時に判断し、作業を行うからである。
このように矯正作業は、経験と勘が必要なうえ重労働であるため、後継者がなかなか育たず、高齢化が進んで作業能率も低下している。
また、人力のみに頼っているため、直径１００ｍｍ以上の太い竹には適用できないという問題点がある。
According to this method, according to an expert, in the case of a thin bamboo material having a length of 4 m and a diameter of about 30 to 50 mm, there are about 3 to 10 correction points per piece, and about 10 to 15 bending corrections per hour. Processing is possible. When working for 8 hours a day, it is calculated that 80 to 120 straightenings are processed, but in fact, this work requires power and is hard work, so it is difficult even for a skilled person to perform it continuously. There are about 80 on average. If an unskilled person works, it is difficult to make it straight. The reason for this is that, according to the long experience so far, the skilled person can determine the heating condition based on factors such as the bending of bamboo, the hardness of bamboo, the length between nodes (the length between nodes), the weight of bamboo, etc. This is because the work is performed by instantaneously judging the degree of bending.
In this way, correction work requires experience and intuition and is a heavy labor, so successors are not easily raised, the aging process is progressing, and work efficiency is also decreasing.
Moreover, since it relies only on human power, there is a problem that it cannot be applied to thick bamboo with a diameter of 100 mm or more.
このような理由から、これまでにも、この矯正作業を自動化する試みがなされ、機械が開発された経緯がある。その機械が特許文献１に記載の竹材矯正装置である。 For these reasons, attempts have been made to automate this correction work, and the machine has been developed. The machine is a bamboo straightening device described in Patent Document 1.
この竹材矯正装置は、対となるローラが多数配置されており、前記ローラの間を竹材がローラの回転により前方に送られる。このとき前記竹材は非回転のまま上下方向、左右方向に曲げられ矯正されるものである。 In this bamboo straightening device, a number of pairs of rollers are arranged, and the bamboo is fed forward between the rollers by the rotation of the rollers. At this time, the bamboo material is bent and corrected in the vertical and horizontal directions without rotation.
特許文献１に記載の発明は、多数のローラ間を竹材が非回転のまま上下方向及び左右方向に曲げられ矯正されるため、装置が非常に大掛かりであり長尺となるばかりではなく、上下方向から左右方向に移動する際に捻じれが生じ、竹材が割れる欠点がある。 In the invention described in Patent Document 1, since the bamboo material is bent and corrected in the vertical direction and the horizontal direction between a large number of rollers without being rotated, the apparatus is not only very large and long, but also in the vertical direction. When moving from left to right, the twisting occurs and the bamboo material breaks.
本発明は、竹材に対しローラを斜めに（角度を持たせて）配置させ回転することにより、竹材に前進運動と回転が与えられる。そのため僅か1ｍほどの支持ロール間で、竹材の全ての点において圧縮・引張の作用が働き効率よく矯正が行われる。また、装置の大きさが、これまでの装置の１/１０程度で非常にコンパクトであり、設備費も経済的であることが期待される。 In the present invention, a forward movement and rotation are imparted to the bamboo material by rotating the roller with the roller disposed obliquely (with an angle). Therefore, between the support rolls of only about 1 m, the action of compression and tension works at all points of the bamboo, and correction is performed efficiently. In addition, it is expected that the size of the apparatus is about 1/10 that of the conventional apparatus and is very compact, and the equipment cost is economical.
（本発明の目的）
以上のことから、本発明の目的は、従来の欠点を除いた、生産性に優れ、且つ圧潰割れがなく、安価な装置で且つ、良質で安価な製品が容易に得られる、竹材の曲がり矯正方法及びその装置を提供することにある。
(Object of the present invention)
From the above, the object of the present invention is to correct the bending of bamboo, which is excellent in productivity, free from crushing cracks, is inexpensive and can be easily obtained with a good quality and inexpensive product, excluding conventional defects. It is to provide a method and apparatus thereof.
上記課題を解決するために本発明が講じた手段は次の通りである。
本発明は、元々持っていた曲がりとは逆向きの曲がりに反転させる負荷を一時的に加えることによってその竹材の曲がりを矯正する、竹材の曲がり矯正方法であって、
軸回転しながら２支点間をその一方から他方に向って通過する竹材に対して、その２支点間の定位置で、竹材軸に垂直な方向の集中荷重を加えることを特徴とする、竹材の曲がり矯正方法である。
Means taken by the present invention to solve the above problems are as follows.
The present invention is a method for correcting the bending of a bamboo material, wherein the bending of the bamboo material is corrected by temporarily applying a load that reverses the bending in the direction opposite to the bending that the original had,
Bamboo material that passes between two fulcrum points from one side to the other while rotating the shaft is applied with a concentrated load in a direction perpendicular to the bamboo material axis at a fixed position between the two fulcrum points. It is a bending correction method.
本発明は、元々持っていた曲がりとは逆向きの曲がりに反転させる負荷を一時的に加えることによってその竹材の曲がりを矯正する、竹材の曲がり矯正装置であって、
竹材を支持する２個の支持ロールと、竹材軸に対し垂直方向の集中荷重を加える押し込みロールを前記支持ロール間に配置し、いずれのロールも鼓状に形成するとともに、いずれのロール軸も前記竹材の通過方向に対して傾斜させ、且つ少なくとも１個のロールを回転駆動させることを特徴とする、竹材の曲がり矯正装置である。
The present invention is a bamboo bending correction device that corrects the bending of the bamboo by temporarily applying a load that reverses the bending opposite to the bending that it originally had,
Two supporting rolls for supporting the bamboo material and a pushing roll for applying a concentrated load in a direction perpendicular to the bamboo material axis are arranged between the supporting rolls, and each roll is formed in a drum shape, and each roll axis is An apparatus for correcting a bending of a bamboo material, characterized in that the bamboo material is inclined with respect to a passing direction of the bamboo material and at least one roll is rotationally driven.
請求項３の発明は、請求項２の発明の構成に加えて、前記３個のロールのうち、少なくとも押し込みロールの押圧面にゴムライニングを施している。 According to a third aspect of the present invention, in addition to the configuration of the second aspect of the invention, a rubber lining is applied to at least the pressing surface of the pressing roll among the three rolls.
前記２個の支持ロールの近傍に、竹材を加熱するための加熱装置を備えていることを特徴とする、請求項２に記載の竹材の曲がり矯正装置である。 The bamboo bending correction device according to claim 2, further comprising a heating device for heating the bamboo material in the vicinity of the two support rolls.
前記２個の支持ロール間に、竹材を冷却するための冷却装置を備えていることを特徴とする、請求項２に記載の竹材の曲がり矯正装置である。 The bamboo bending correction device according to claim 2, further comprising a cooling device for cooling the bamboo material between the two support rolls.
請求項１又は２の発明によれば、竹材は２個の支持ロール（支点）と１個の押し込みロール（着力点）による３点曲げの状態でその軸方向に進みながら回転し、それによって竹材の各点（注目点）は、どの方向の断面でも曲率が図２に示すように、その回転によって＋から−、−から＋と大きく変化するため、正逆曲げを繰返し受けることになり、それによってその竹材は徐々にその曲がりぐせをどの方向も矯正され、最終的には真っ直ぐになって出て行く。従って、例えばロール径を１００ｍｍ、傾斜角２５〜３０°とすれば、ロール回転５０ｒｐｍで６〜７ｍ／ｍｉｎの速度での曲がり矯正が容易に可能となる。竹材の平均長を４ｍとすれば１時間当たり４０〜５０本の曲がり矯正が可能となり、従来の手動工法の約５倍の処理能力を持つことになり、他の材料にも太刀打ち可能になる。 According to the invention of claim 1 or 2, the bamboo material is rotated while proceeding in the axial direction in a three-point bending state by two supporting rolls (fulcrum) and one pushing roll (adhesion point), whereby the bamboo material As shown in FIG. 2, the curvature of each point (attention point) of FIG. 2 is greatly changed from + to − and − to + by the rotation as shown in FIG. As a result, the bamboo material is gradually corrected in any direction, and finally it goes straight out. Therefore, for example, when the roll diameter is 100 mm and the inclination angle is 25 to 30 °, it is possible to easily correct the bending at a speed of 6 to 7 m / min at a roll rotation of 50 rpm. If the average length of the bamboo is 4 m, 40 to 50 bends can be corrected per hour, and the processing capacity is about five times that of the conventional manual method, making it possible to beat other materials.
請求項３の発明によれば、請求項２の効果に加えて、集中荷重が加わると例えばｍｍ単位で面が沈み込み、竹材に加わる面圧が低下し、その圧潰割れが防止される。 According to the invention of claim 3, in addition to the effect of claim 2, when a concentrated load is applied, the surface sinks, for example, in mm, the surface pressure applied to the bamboo material is reduced, and crushing cracks are prevented.
本発明に関わる竹材の曲がり矯正方法及びその装置について先ず図１（ａ，ｂ）により説明する。１は竹材、２，３はそれぞれその竹材１を（図では下から）支持する２個の鼓状支持ロール、４は１個の鼓状の押し込みロールであって、前記支持ロール２，３間に配置してあって、後述のように、一方の支持ロール２から他方の支持ロール３に向って（図では左から右へ）前記竹材１を通過させながら、（図では上から下へ）押し込み、その竹材１に対して押し込む方向に（図では下方向に）凸に湾曲するよう集中荷重を加えるものである。 First, a bamboo bending correction method and apparatus according to the present invention will be described with reference to FIGS. 1 is bamboo, 2 and 3 are two drum-shaped support rolls for supporting the bamboo material 1 (from the bottom in the figure), and 4 is one drum-shaped pushing roll between the support rolls 2 and 3. As described later, while passing the bamboo material 1 from one support roll 2 to the other support roll 3 (from left to right in the figure) (from top to bottom in the figure) The concentrated load is applied so as to be bent convexly in the direction of pushing into the bamboo material 1 (downward in the figure).
さらに前記支持ロール２，３は、少なくともいずれか一方が回転すると、前記竹材１がその一方から他方に向って移動しながらその軸の周りに回転するよう、その移動方向に対していずれも同じ角度θ傾斜させてある。それに対して、前記押し込みロール４はその支持ロール２，３と同じ角度θ、逆向きに傾斜させてある。なお、竹材１に捻りが生じないようにするためには、前記支持ロール２,３のいずれかを回転させる代わりに、前記押し込みロール４を回転させるのが好ましい。 Further, when at least one of the support rolls 2 and 3 rotates, the bamboo material 1 rotates around the axis while moving from one to the other, so that the same angle with respect to the moving direction. θ is inclined. On the other hand, the pushing roll 4 is inclined at the same angle θ as the supporting rolls 2 and 3 in the opposite direction. In order to prevent the bamboo material 1 from being twisted, it is preferable to rotate the pushing roll 4 instead of rotating any one of the support rolls 2 and 3.
ロール寸法について説明すると、竹材１はその軸方向の曲げには強いが、中空であるため押し込みロール４によって押圧されると扁平になって、周方向に弱いその内面が引っ張られ、圧潰割れを起こすという欠点があり、押し込み荷重（特に面圧）の低減を図る必要がある。そのためには、（１）曲げスパン（支持ロール２，３間距離Ｌ）を大きく取って押込み荷重を小さくする。（２）竹材１と接する押し込みロール４の面を竹材１の外形に沿った形状・寸法にすると共に、その表面を柔らかい材質にする（例えば上述のようにゴムライニングを施す）ことによって、押し込みロール４との接触面積を大きくし、面圧を小さくする必要がある。 Describing the roll dimensions, the bamboo material 1 is strong in bending in the axial direction, but since it is hollow, it becomes flat when pressed by the pushing roll 4, and its inner surface is weakened in the circumferential direction, causing crushing cracks. Therefore, it is necessary to reduce the indentation load (particularly the surface pressure). To that end, (1) the bending span (distance L between the support rolls 2 and 3) is increased to reduce the indentation load. (2) The surface of the push roll 4 in contact with the bamboo material 1 is shaped and dimensioned along the outer shape of the bamboo material 1, and the surface is made of a soft material (for example, rubber lining is applied as described above), thereby pushing the roll. It is necessary to increase the contact area with 4 and reduce the surface pressure.
すなわち、（１）の押し込み荷重の低減については、次の式に示すように、同一曲げモーメントMnに対して押し込み荷重Ｐは
P＝４・Mn／L （式１）
と支持ロール２，３の支持ロール間隔Ｌに反比例するため、その間隔Ｌはなるべく大きいほうがよい。しかし支持ロール間隔を大きくすると、曲がり矯正が十分行われない端部が長くなるので、適正な長さにすることが必要で、竹材１の径ｄの１０〜３０倍程度の大きさにする。
That is, for reducing the indentation load in (1), the indentation load P is equal to the same bending moment Mn as shown in the following equation.
P = 4 · Mn / L (Formula 1)
Therefore, the distance L is preferably as large as possible. However, if the interval between the support rolls is increased, the end portion where the bending correction is not sufficiently performed becomes longer. Therefore, it is necessary to make the length appropriate, and the size is about 10 to 30 times the diameter d of the bamboo material 1.
また、（２）の前記押し込みロール４との接触面積を大きくし、面圧を小さくすることは、上述のように既に押し込みロール４を鼓状に形成することによってかなりの程度達成されているが、さらに集中荷重が加わるとｍｍ単位で面が沈み込むようロール４の表面にゴムライニングを施すことによって対応する。
そのうえ、前記竹材１を押し込みロール４の表面と２点で接触せず包み込むよう、その鼓の曲率半径Ｒをある程度大きくする。すなわち、
Ｄ・(ｄ／Ｄ＋ｃｏｓθ)２／（２(ｄ／Ｄ＋１)ｓｉｎ２θ） （式２）
より大きく設定する。また、そのロール４の長さＷを、竹材１（正確にはその接触点）がロール４の両端からはみ出ないように
２Ｒｔａｎθ（１−√（１−（Ｄ＋ｄ／ｃｏｓθ)／（Ｒｔａｎ２θ)） （式３）
よりも大きく略等しくする。
但し、Ｄ：ロール径、ｄ：竹材径、θ：ロール傾斜角
なお、押し込みロール４は細すぎると竹材との間のすべりが問題となり、太すぎるとロール間隔が大きくなり曲がり矯正が十分行われない端部が長くなるので適切な大きさが必要で、中央径を太い竹材径と同程度か又は細い竹材径の３倍程度とする。ロール軸の傾斜角θは大きすぎると竹材が装置を通過する間の回転数が小さくなって曲がり矯正効果が十分行われず、小さすぎると逆に回転数が大きくなって材料の圧潰割れに繋がるので、２５〜３５°に設定することが好ましい。また、押し込みロール４の押し込み量Δｈは、竹材１が真直の場合に支持ロール２，３上に載せて押し込みロール４が接する位置からさらに押し込む深さであり、曲がり矯正効果の発揮と竹材の圧潰割れ回避の観点から、曲げ歪を１％〜３％になるように設定することが望ましい。曲げ歪をε（％）とすれば、
Δｈ＝ε・L2／(４００・ｄ) （式４）
となる。
In addition, increasing the contact area with the pushing roll 4 and reducing the surface pressure in (2) has already been achieved to some extent by forming the pushing roll 4 in a drum shape as described above. Further, this is dealt with by applying a rubber lining to the surface of the roll 4 so that the surface sinks in mm when a concentrated load is applied.
In addition, the radius of curvature R of the drum is increased to some extent so as to wrap the bamboo material 1 without touching the surface of the push roll 4 at two points. That is,
D · (d / D + cos θ) 2 / (2 (d / D + 1) sin 2 θ) (Formula 2)
Set larger. Also, the length W of the roll 4, bamboo 1 (more precisely, the contact point) 2Rtanshita so as not protrude from both ends of the roll 4 (1-√ (1- ( D + d / cosθ) / (Rtan 2 θ) (Formula 3)
Larger and approximately equal.
However, D: roll diameter, d: bamboo material diameter, θ: roll inclination angle If the push-in roll 4 is too thin, sliding between the bamboo materials becomes a problem, and if it is too thick, the roll interval becomes large and the bending is sufficiently corrected. Since the end portion that does not exist is long, an appropriate size is required, and the center diameter is set to be about the same as the diameter of the thick bamboo material or about three times the diameter of the thin bamboo material. If the roll shaft inclination angle θ is too large, the number of rotations during the passage of the bamboo material through the device will be small and the curving correction effect will not be sufficiently performed. If it is too small, the number of rotations will be large and the material will be crushed. It is preferable to set to 25 to 35 °. Further, the pushing amount Δh of the pushing roll 4 is the depth of further pushing from the position where the pushing roll 4 is placed on the support rolls 2 and 3 when the bamboo material 1 is straight, and exhibits the bending correction effect and crushing the bamboo material From the viewpoint of avoiding cracks, it is desirable to set the bending strain to be 1% to 3%. If the bending strain is ε (%),
Δh = ε · L 2 / (400 · d) (Formula 4)
It becomes.
以上の構成によって、前記竹材１は支持ロール２，３間を進む間に１５〜２５回転し、それを曲がった状態で回転させると、竹材１のどの点（注目点）も断面の全方向に曲げと曲げ戻しとを３回以上受けることになって、曲がり矯正効果を十分に発揮できる。しかし図３に示すように、竹材１は支持ロール２，３外で跳ね上がるため、竹材１に初期曲がりがあれば、竹材進行の入口側で１回転する間に破線のように振れる。この振れは竹材１の回転数が低ければ低振動のため問題はないが、回転数が高ければ高振動の揺れとなり、その振幅が共振現象によって拡大する（いわゆる暴れが起こる）おそれがある。従って共振現象による振れ拡大を抑止するために（竹材１の回転数が１５０ｒｐｍ以下になるよう）ロール回転数を５０ｒｐｍ程度にとどめることが望ましい。 With the above configuration, the bamboo material 1 rotates 15 to 25 while traveling between the support rolls 2 and 3, and when it is rotated in a bent state, any point (attention point) of the bamboo material 1 is in all directions of the cross section. Bending and unbending are received three times or more, and the bending correction effect can be sufficiently exhibited. However, as shown in FIG. 3, since the bamboo material 1 jumps up outside the support rolls 2 and 3, if the bamboo material 1 has an initial bend, the bamboo material 1 swings as shown by a broken line during one rotation on the entrance side of the bamboo material. If the rotation speed of the bamboo material 1 is low, there is no problem because the vibration is low, but if the rotation speed is high, there is a problem of high vibration, and the amplitude may increase due to a resonance phenomenon (so-called rampage). Therefore, it is desirable to keep the roll rotation speed to about 50 rpm (so that the rotation speed of the bamboo material 1 is 150 rpm or less) in order to suppress the expansion of vibration due to the resonance phenomenon.
この装置の運転について説明すると、（式１）に基づき、圧潰割れを起こさないよう、まず竹材１の径ｄに応じて両支持ロール２，３の間隔Ｌを設定する。次に竹材１の矯正効果を高めるためと、圧潰割れを防ぐために、予め竹材１を約１００℃に加熱しておく（この加熱は本発明とは関係なく別の装置で行う）。この作業は、竹材中のリグニンのガラス転移点（６０〜８０℃）以上に加熱することにより竹材を軟化させるためである。その加熱した竹材１の先端を下流側の支持ロール３上に置き、竹材１を両支持ロール２，３で支持した状態で押込みロール４を下げて行く。その押込みロール４による竹材１の押し込みが始まったらそれの回転駆動を開始すると共に、竹材１の径ｄに応じてさらに前述の位置Δｈまで押し込む。それに伴って竹材１はその軸方向の前進及び回転を開始すると共に、押し込みロール４によって曲がりの矯正が開始される。この開始と同時に予め加熱した温度を低下させないために、加熱装置１０により熱風を竹材１に吹きかける。その状態は、その竹材１の後端が前記支持ロール２から外れる直前（例えば１〜２回転後に外れる）に進むまで続ける。竹材１の後端が前記支持ロール２から外れる直前に進んだら、一旦前記支持ロール２，３及び押込みロール４、加熱装置１０を停止させる。次に、前記支持ロール２，３間の下部に配置された冷却装置２０のスイッチを入れ、直接冷水を竹材１に吹きかける。そして、その常態で前記支持ロール２，３及び押込みロール４をこれまでとは逆回転させ、竹材１の先端が前記支持ロール３から外れる直前に進んだら、前記押込みロール４を後退させ、前記竹材１の進行、回転及び曲がりの矯正を停止させる。それによって、その竹材１は格別大きな振れ（跳ね返り）もなく、安全に回転しながら支持ロール２，３の間を通過し、且つその間で前記冷却装置２０により急激に冷却されるため、竹材中のリグニンがガラス転移点以下になり硬くなるので、その曲がりが矯正され、真っ直ぐになる。 The operation of this apparatus will be described. Based on (Equation 1), the interval L between the two support rolls 2 and 3 is first set according to the diameter d of the bamboo material 1 so as not to cause crushing cracks. Next, in order to enhance the straightening effect of the bamboo material 1 and to prevent crushing cracks, the bamboo material 1 is preheated to about 100 ° C. (this heating is performed by another apparatus irrespective of the present invention). This work is for softening the bamboo material by heating to a glass transition point (60 to 80 ° C.) or more of lignin in the bamboo material. The tip of the heated bamboo material 1 is placed on the downstream support roll 3, and the push roll 4 is lowered while the bamboo material 1 is supported by both the support rolls 2 and 3. When the pushing of the bamboo material 1 by the pushing roll 4 starts, the rotation of the bamboo material 1 is started and further pushed to the position Δh according to the diameter d of the bamboo material 1. Along with this, the bamboo material 1 starts to advance and rotate in the axial direction, and correction of bending is started by the push roll 4. Simultaneously with this start, hot air is blown onto the bamboo material 1 by the heating device 10 in order not to lower the temperature heated in advance. This state continues until the rear end of the bamboo material 1 proceeds just before it is removed from the support roll 2 (for example, after 1 to 2 rotations). When the rear end of the bamboo material 1 is advanced immediately before it is detached from the support roll 2, the support rolls 2 and 3, the push roll 4, and the heating device 10 are once stopped. Next, the cooling device 20 disposed at the lower part between the support rolls 2 and 3 is turned on, and cold water is directly sprayed onto the bamboo material 1. Then, in the normal state, the support rolls 2 and 3 and the push roll 4 are rotated in the reverse direction so far, and when the front end of the bamboo material 1 advances just before the support roll 3 is detached, the push roll 4 is moved backward, and the bamboo material Stop the progress, rotation and bend correction of 1. Thereby, the bamboo material 1 passes between the support rolls 2 and 3 while rotating safely and without any significant swing (bounce back), and is rapidly cooled by the cooling device 20 between them. Since lignin is below the glass transition point and hardens, the bend is corrected and straightened.
作用について図２によって説明すると、竹材１は、上述のように２個の支持ロール２，３と１個の押し込みロール４による３点曲げ状態でその軸方向に進みながら回転するが、それによって各点（注目点）の任意方向の曲率が、図のように軸方向位置の進行によって＋から−、−から＋と大きく変化し、正逆曲げを繰返し受けることになると共に、その曲率の振幅は、上流側の支持ロール２から押し込みロール４までは次第に増大し、極大値を経た後、下流側の支持ロール３に向かって次第に低下して行く。それによってその竹材１は徐々にその曲がりを矯正され、最終的には真っ直ぐになって行く。 The action will be described with reference to FIG. 2. The bamboo material 1 rotates while proceeding in the axial direction in a three-point bending state by the two support rolls 2, 3 and one push roll 4 as described above. The curvature of the point (attention point) in any direction changes greatly from + to-and-to + as the axial position progresses as shown in the figure, and it repeatedly receives forward and reverse bending, and the amplitude of the curvature is The distance from the upstream support roll 2 to the push-in roll 4 gradually increases, and after passing through the maximum value, gradually decreases toward the downstream support roll 3. As a result, the bamboo material 1 is gradually corrected in its bending and finally straightened.
１ 竹材
２ 支持ロール
３ 支持ロール
４ 押し込みロール
１０ 加熱装置
２０ 冷却装置
Ｄ ロール径
ｄ 竹材の径
Ｌ ２支持ロールの間隔
Ｍｎ 曲げモーメント
Ｐ 押し込み荷重
Ｒ 鼓の曲率半径
Δｈ 押し込み量
θ 傾斜角度
DESCRIPTION OF SYMBOLS 1 Bamboo material 2 Support roll 3 Support roll 4 Push-in roll 10 Heating device 20 Cooling device D Roll diameter d Bamboo material diameter L 2 Support roll interval Mn Bending moment P Indentation load R Curvature radius Δh Indent amount θ Inclination angle
Claims (5)
軸回転しながら２支点間をその一方から他方に向って通過する竹材に対して、その２支点間の定位置で、竹材軸に垂直な方向の集中荷重を加えることを特徴とする、竹材の曲がり矯正方法。 A bamboo bending correction method that corrects the bending of the bamboo by temporarily applying a load that reverses the bending opposite to the bending that the bamboo originally had,
Bamboo material that passes between two fulcrum points from one side to the other while rotating the shaft is applied with a concentrated load in a direction perpendicular to the bamboo material axis at a fixed position between the two fulcrum points. Bending correction method.
竹材を支持する２個の支持ロールと、竹材軸に対し垂直方向の集中荷重を加える押し込みロールを前記支持ロール間に配置し、いずれのロールも鼓状に形成するとともに、いずれのロール軸も前記竹材の通過方向に対して傾斜させ、且つ少なくとも１個のロールを回転駆動させることを特徴とする、竹材の曲がり矯正装置。 It is a bamboo bending correction device that corrects the bending of the bamboo by temporarily applying a load that reverses the bending in the direction opposite to the bending that the bamboo originally had,
Two supporting rolls for supporting the bamboo material and a pushing roll for applying a concentrated load in a direction perpendicular to the bamboo material axis are arranged between the supporting rolls, and each roll is formed in a drum shape, and each roll axis is An apparatus for correcting a bending of a bamboo material, characterized in that the bamboo material is inclined with respect to a passing direction of the bamboo material and at least one roll is rotationally driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009076043A JP2010228170A (en) | 2009-03-26 | 2009-03-26 | Method and device for correcting bend of bamboo material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009076043A JP2010228170A (en) | 2009-03-26 | 2009-03-26 | Method and device for correcting bend of bamboo material |
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| Publication Number | Publication Date |
|---|---|
| JP2010228170A true JP2010228170A (en) | 2010-10-14 |
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ID=43044508
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009076043A Withdrawn JP2010228170A (en) | 2009-03-26 | 2009-03-26 | Method and device for correcting bend of bamboo material |
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| JP (1) | JP2010228170A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110890080A (en) * | 2019-12-25 | 2020-03-17 | 聂润英 | Flute is roast straight device |
| CN112536873A (en) * | 2020-11-24 | 2021-03-23 | 何志南 | Equipment is corrected to culture flute production earlier stage curvature |
-
2009
- 2009-03-26 JP JP2009076043A patent/JP2010228170A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110890080A (en) * | 2019-12-25 | 2020-03-17 | 聂润英 | Flute is roast straight device |
| CN110890080B (en) * | 2019-12-25 | 2023-08-11 | 欧北特(南京)科技发展有限公司 | Flute baking straight device |
| CN112536873A (en) * | 2020-11-24 | 2021-03-23 | 何志南 | Equipment is corrected to culture flute production earlier stage curvature |
| CN112536873B (en) * | 2020-11-24 | 2022-09-20 | 安徽润仲科技有限公司 | Equipment is corrected to culture flute production earlier stage curvature |
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