【０００１】
【発明の属する技術分野】
本発明は棒鋼等の重量長尺物をクレーンにより吊り上げるための自動玉掛け吊具に関するものである。
【０００２】
【従来の技術】
棒鋼等の重量長尺物をクレーンにより吊り上げるための自動玉掛け吊具は、従来より実開平２−９９８８６号公報，実開平４−３４２８４号公報，実開平４−６０９９１号公報等により知られているが、これら従来の玉掛け吊具は、吊具本体の両端部に一対の吊アームをシリンダを作動させることにより外方に回転し拡張し得るように構成したものであった。
【０００３】
【発明が解決しようとする課題】
ところで、吊荷である棒鋼等の長尺物製品の長さには長いものから短いものまで非常に大きな幅があるが、従来の上記吊具の構造では長さに対する適用範囲が狭く、実状にそぐわないという問題があった。また、吊アームの回転支点となる枢軸に集中荷重が掛かるので強度が損なわれるという問題があった。
そこで本発明は、長いものから比較的短いものまで広範囲に吊り上げられるとともに、耐荷重性が優れた長尺物自動玉掛け吊具を提供しようとするものである。
【０００４】
【課題を解決するための手段】
そのために本発明に係る長尺物自動玉掛け吊具は、クレーンにより略水平に支持される長尺ビームの長軸中心の両側に一対の支持枠体を夫々走行可能に吊下し、該各支持枠体を該長尺ビームに沿って走行させる走行駆動装置を設けるとともに、該各支持枠体は垂下アーム対を拡縮自在に吊下し、該垂下アーム対の下端に所定長の吊索を張設してなることを特徴とする。
また本発明は上記長尺物自動玉掛け吊具において、走行駆動装置は、長尺ビームの長軸中心の両側に夫々モータによって回転駆動される一対の螺子軸を設け、各支持枠体には該各螺子軸に螺合するボール螺子を設けてなるものであることを特徴とする。
【０００５】
【発明の実施の形態】
次に図面に従い本発明の実施の形態を説明する。図１は本発明に係る長尺物自動玉掛け吊具の正面図、図２はそのＡ−Ａ線断面矢視図である。同図中、１は２本のＩ形鋼１ａ，１ａを横架材１ｂを固着することにより平行に配してなる長尺ビームで、該長尺ビームの上面に一対の吊金具２，２を突設し、該吊金具にクレーン（図示せず）ロープのフック３，３を掛けて吊り上げることにより、該長尺ビーム１が略水平に支持されるようにしている。また、４，４は該長尺ビーム１の長軸中心の両側に吊下された一対の支持枠体である。該支持枠体４，４は、水平杆５，５の上面に軸受片６，６を突設することで夫々８個の車輪７を夫々回転自在に支持し、該各車輪７をＩ形鋼１ａ，１ａの下辺上を乗せて転動させることで、該長尺ビーム１に沿って走行可能に吊下する。
【０００６】
また、８，８は該支持枠体４，４を長尺ビーム１に沿って走行させる走行駆動装置で、該走行駆動装置は、長尺ビーム１の長軸中心の両側に長手方向に沿い一対の螺子軸９，９を軸受１０，１１によって夫々回転自在に軸支し、該螺子軸９，９の一端に固着したスプロケット１２，１２と減速機付きモータ１３，１３の回転軸に固着したスプロケット１４，１４に無端チェーン１５，１５を巻き掛けし、さらに、前記水平杆５，５上に突設された支持台１６，１６に該螺子軸９，９に螺合するボール螺子１７，１７を設けてなる。
【０００７】
また、支持枠体４，４は水平杆５，５の両端部にピン１８，１８によって一対の垂下アーム１９，１９を拡縮自在に吊下し、該垂下アーム対の下端に所定長のベルト，チェーン等の吊索２０を張設し、該垂下アーム対の略中間部にリンク部材２１，２１をトグルジョイント様に組み付け、該リンク部材２１，２１の交点を水平杆５，５の下面との間に設けられた圧縮バネ２２によって弾性的に圧下し、常態ではその弾性により該垂下アーム１９，１９対が拡幅され、吊索２０が水平に引っ張られるようにしている。
【０００８】
このように構成した玉掛け吊具では、モータ１３，１３を駆動して螺子軸９，９を回転させることで支持枠体４，４を長尺ビーム１に沿って走行させ任意の位置で停止できるので、図１に示したように両支持枠体４，４の間隔に吊り上げようとする長尺物２３が位置するように調整し、その状態で両支持枠体４，４の間隔をさらに狭め、両支持枠体４，４の吊索２０上に該長尺物２３があるようにしてからクレーン操作により長尺ビーム１を吊り上げれば、図３に示したように該長尺物２３が該吊索２０により吊り上げられる。そのとき図４に示したように該長尺物２３の荷重によって該吊索２０は撓み圧縮バネ２２の弾性に抗して垂下アーム１９，１９対は縮まり該長尺物２３は該吊索２０により包まれることから安定的に吊り上げることができる。また、長尺物２３を降ろしたときは圧縮バネ２２の弾性により吊索２０はまた水平に張設される。
【０００９】
また、図５に示したように、両支持枠体４，４を長尺ビーム１の一方に寄せることも可能であるので、比較的短い長尺物２６を吊り上げる場合はこのように両支持枠体４，４を偏在させることで工場内壁面等の邪魔となることなく上げ降ろしをすることができる。
【００１０】
なお、この実施形態では、走行駆動装置として、螺子軸９，９とボール螺子１７，１７を示したが、チェーン駆動により両支持枠体４，４を走行させるようにしてもよい。
【００１１】
【発明の効果】
このように本発明に係る長尺物自動玉掛け吊具は、クレーンにより略水平に支持される長尺ビームの長軸中心の両側に一対の支持枠体を夫々走行可能に吊下し、該各支持枠体を該長尺ビームに沿って走行させる走行駆動装置を設けるとともに、該各支持枠体は垂下アーム対を拡縮自在に吊下し、該垂下アーム対の下端に所定長の吊索を張設してなるので、長尺ビームの長さ如何により長いものから比較的短いものまで広範囲に吊り上げられ、しかも従来の玉掛け吊具のように枢軸を有しないので、耐荷重性が優れるなど有益な効果がある。
【図面の簡単な説明】
【図１】本発明の実施形態を示す長尺物自動玉掛け吊具の正面図。
【図２】図１の長尺物自動玉掛け吊具のＡ−Ａ線断面矢視図。
【図３】図１の長尺物自動玉掛け吊具の使用状態を示した正面図。
【図４】図３の長尺物自動玉掛け吊具のＢ−Ｂ線断面矢視図。
【図５】図１の長尺物自動玉掛け吊具の使用状態を示した正面図。
【符号の説明】
１ 長尺ビーム
２ 吊金具
４ 支持枠体
７ 車輪
８ 走行駆動装置
９ 螺子軸
１３ モータ
１７ ボール螺子
１９ 垂下アーム
２０ 吊索[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sling suspender for lifting a heavy and long object such as a steel bar by a crane.
[0002]
[Prior art]
2. Description of the Related Art An automatic sling and hanging tool for lifting a heavy and long object such as a steel bar by a crane is conventionally known from Japanese Utility Model Laid-Open No. 2-99886, Japanese Utility Model Laid-Open No. 4-34284, Japanese Utility Model Laid-Open No. 4-60991, and the like. However, these conventional sling hanging devices are configured such that a pair of hanging arms can be rotated outward and expanded at both ends of the hanging device main body by operating a cylinder.
[0003]
[Problems to be solved by the invention]
By the way, the length of a long product such as a steel bar, which is a suspended load, has a very large width from a long one to a short one. There was a problem that it did not fit. Further, there is a problem that the strength is impaired because a concentrated load is applied to the pivot, which is a rotation fulcrum of the suspension arm.
Therefore, the present invention aims to provide a long-length automatic sling suspension tool that can be lifted over a wide range from a long one to a relatively short one and has excellent load resistance.
[0004]
[Means for Solving the Problems]
For this purpose, the long object automatic sling suspender according to the present invention suspends a pair of support frames on both sides of the center of the long axis of a long beam supported substantially horizontally by a crane so as to be able to travel, respectively. A traveling drive device for moving the frame along the long beam is provided, and each of the support frames suspends a hanging arm pair so as to be able to expand and contract, and extends a hanging cable of a predetermined length at the lower end of the hanging arm pair. It is characterized by being provided.
Further, in the present invention, in the long object automatic sling hanging device, the traveling drive device is provided with a pair of screw shafts which are respectively driven to be rotated by motors on both sides of the center of the long axis of the long beam. It is characterized in that a ball screw is screwed to each screw shaft.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an automatic sling for hanging a long object according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. In the drawing, reference numeral 1 denotes a long beam in which two I-shaped steel members 1a, 1a are arranged in parallel by fixing a horizontal member 1b, and a pair of hanging fittings 2, 2 is provided on the upper surface of the long beam. The elongate beam 1 is supported substantially horizontally by hanging the hooks 3 and 3 of a crane (not shown) on the hanging metal fittings. Reference numerals 4 and 4 denote a pair of support frames suspended on both sides of the center of the long axis of the long beam 1. The support frames 4, 4 respectively support eight wheels 7 rotatably by projecting bearing pieces 6, 6 on the upper surfaces of the horizontal rods 5, 5, respectively. By rolling on the lower side of 1a, 1a, it is suspended so that it can run along the long beam 1.
[0006]
Numerals 8 and 8 denote traveling driving devices for moving the supporting frames 4 and 4 along the long beam 1, and the traveling driving device comprises a pair of longitudinal driving beams on both sides of the center of the long axis of the long beam 1. Screw shafts 9 and 9 are rotatably supported by bearings 10 and 11, respectively, and sprockets 12 and 12 fixed to one end of the screw shafts 9 and 9 and sprockets fixed to the rotating shafts of motors 13 and 13 with reduction gears. The endless chains 15, 15 are wound around 14, 14, and further, ball screws 17, 17 screwed to the screw shafts 9, 9 are supported on support bases 16, 16 protruding from the horizontal rods 5, 5. Provided.
[0007]
Further, the support frames 4, 4 suspend a pair of hanging arms 19, 19 at both ends of the horizontal rods 5, 5 by pins 18, 18 so as to be able to expand and contract, and a belt of a predetermined length is attached to the lower end of the hanging arm pair. A hanging cable 20 such as a chain is stretched, and link members 21 and 21 are attached to a substantially intermediate portion of the pair of hanging arms in a toggle joint manner. An intersection of the link members 21 and 21 is connected to the lower surface of the horizontal rods 5 and 5. It is elastically lowered by a compression spring 22 provided therebetween, and in a normal state, the elasticity causes the hanging arms 19 and 19 to be widened so that the hanging cable 20 is pulled horizontally.
[0008]
In the sling hanging device configured as described above, by driving the motors 13, 13 to rotate the screw shafts 9, 9, the support frames 4, 4 can travel along the long beam 1 and can be stopped at an arbitrary position. Therefore, as shown in FIG. 1, the distance between the two supporting frames 4 and 4 is adjusted so that the long object 23 to be lifted is located at the distance between the two supporting frames 4 and 4. In this state, the distance between the two supporting frames 4 and 4 is further reduced. When the long beam 1 is lifted by the crane operation after the long object 23 is placed on the suspension cords 20 of the two support frames 4, 4, the long object 23 is moved as shown in FIG. It is lifted by the hanging cable 20. At this time, as shown in FIG. 4, the hanging cable 20 is bent by the load of the elongated object 23, and the hanging arms 19, 19 are shrunk against the elasticity of the compression spring 22, and the elongated object 23 is connected to the hanging cable 20. It can be stably lifted because it is wrapped by the. When the long object 23 is lowered, the suspension cable 20 is stretched horizontally by the elasticity of the compression spring 22.
[0009]
Further, as shown in FIG. 5, since both support frames 4, 4 can be moved toward one of the long beams 1, when the relatively short long object 26 is lifted, the two support frames are thus used. By distributing the bodies 4 and 4 unevenly, it is possible to raise and lower the body without obstructing the inner wall of the factory.
[0010]
In this embodiment, the screw shafts 9, 9 and the ball screws 17, 17 are shown as the traveling drive devices. However, the two support frames 4, 4 may be driven by a chain drive.
[0011]
【The invention's effect】
As described above, the long object automatic sling suspender according to the present invention suspends the pair of support frames on both sides of the center of the long axis of the long beam supported substantially horizontally by the crane so as to be able to travel, respectively. A traveling drive device for traveling the support frame along the long beam is provided, and each of the support frames suspends a pair of hanging arms so as to be able to expand and contract, and a hanging cable having a predetermined length is provided at a lower end of the pair of hanging arms. Because it is stretched, it can be lifted over a wide range from a long beam to a relatively short one depending on the length of the long beam, and since it does not have a pivot unlike the conventional sling hanging tool, it has excellent load resistance, etc. Has a significant effect.
[Brief description of the drawings]
FIG. 1 is a front view of a long object automatic sling and hanging tool showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of the elongate automatic sling hanging device of FIG. 1;
FIG. 3 is a front view showing a use state of the long object automatic sling hanging device of FIG. 1;
FIG. 4 is a sectional view taken along line BB of the long object automatic sling hanging tool of FIG. 3;
FIG. 5 is a front view showing a use state of the long object automatic sling hanger of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Long beam 2 Suspension fitting 4 Support frame 7 Wheel 8 Traveling drive device 9 Screw shaft 13 Motor 17 Ball screw 19 Hanging arm 20 Hanging cable
