JP3151073U - Co-rotation prevention jig - Google Patents

Co-rotation prevention jig Download PDF

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JP3151073U
JP3151073U JP2009001892U JP2009001892U JP3151073U JP 3151073 U JP3151073 U JP 3151073U JP 2009001892 U JP2009001892 U JP 2009001892U JP 2009001892 U JP2009001892 U JP 2009001892U JP 3151073 U JP3151073 U JP 3151073U
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nut
bolt
jig
preventing
screwed
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幹夫 大峰
幹夫 大峰
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Kagome Co Ltd
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Abstract

【課題】ボルトやナット又は被締結部材を特殊な構造に加工する必要がなく、汎用性に富み、構造が簡単で、安価に製作できる共回り防止用冶具を提供する。【解決手段】ナットを回すときに該ナットが螺合するボルト又は該ボルトに螺合する他のナットが共回りしないようにするための冶具であって、ボルト又は他のナットに着脱可能に係止する係止部材と、該係止部材から延設したアームと、該アームの先端に取付けた錘とを具備した。【選択図】図１A jig for preventing co-rotation is provided that does not require a bolt, a nut, or a member to be fastened to be processed into a special structure, is versatile, has a simple structure, and can be manufactured at low cost. A jig for preventing a bolt screwed into the nut or another nut screwed into the bolt from rotating together when the nut is turned, wherein the jig is detachably engaged with the bolt or the other nut. A locking member to be stopped, an arm extending from the locking member, and a weight attached to the tip of the arm were provided. [Selection] Figure 1

Description

本考案は共回り防止用冶具に関する。複数の被締結部材にボルトを通し、その片側又は両側からナットを締め付けて相互に締結したり、又は締め付けたナットを緩めて相互の締結を解除することが行なわれる。例えば、複数の殺菌用加熱プレートに頭部のないボルトを通し、その両側からナットを締め付け、殺菌機を構成して、飲食品の殺菌に供したり、又は締め付けたナットを緩めて一枚一枚の殺菌用加熱プレートに分解し、清掃に供するような場合である。このような場合、ナットを回すときに該ナットが螺合するボルト又は該ボルトが螺合する他のナットが共回りすると、ナットを締め付けて複数の被締結部材を相互に締結したり、又はナットを緩めて相互の締結を解除することができなくなる。本考案はかかる共回りを防止するための冶具に関する。   The present invention relates to a jig for preventing co-rotation. Bolts are passed through a plurality of members to be fastened, and nuts are tightened from one side or both sides to fasten each other, or the tightened nuts are loosened to release mutual fastening. For example, pass headless bolts through multiple sterilization heating plates, tighten nuts from both sides, configure a sterilizer, and sterilize food or drink, or loosen the tightened nuts one by one It is a case where it decomposes | disassembles into a heating plate for sterilization and uses for cleaning. In such a case, when the nut that is screwed into the nut or another nut to which the bolt is screwed rotates when the nut is rotated, the nut is fastened to fasten a plurality of members to be fastened together, or the nut It becomes impossible to release the mutual fastening by loosening. The present invention relates to a jig for preventing such co-rotation.

従来、前記のような共回りを防止する手段として、１）ボルト又はナットに突出部を設け、該突出部を被締結部材に設けた縦壁部に当接させるようにした例（例えば特許文献１参照）、２）被締結部材にボルト又はナットの回転を規制するための凹部や段差部等を設けた例（例えば特許文献２〜４参照）等が知られている。しかし、１）の従来手段にはボルト又はナットを特殊な構造に加工する必要があり、また２）の従来手段には被締結部材を特殊な構造に加工する必要があって、共に汎用性に欠け、構造が複雑になって、高価になるという問題がある。   Conventionally, as means for preventing the above-mentioned co-rotation, 1) an example in which a protrusion is provided on a bolt or nut, and the protrusion is brought into contact with a vertical wall provided on a member to be fastened (for example, patent document) 1) 2) An example in which a recessed portion or a stepped portion for restricting the rotation of a bolt or a nut is provided on a member to be fastened (see, for example, Patent Documents 2 to 4) is known. However, the conventional means of 1) requires processing of bolts or nuts into a special structure, and the conventional means of 2) requires processing of the fastening member into a special structure, both of which are versatile. There is a problem that chipping, the structure becomes complicated, and the cost becomes high.

特開２００３−２０２０１１号公報JP 2003-202011 A 特開平１１−２８７２３２号公報JP-A-11-287232 特開２００２−１３０２２１号公報JP 2002-130221 A 特開２００６−２８１８５６号公報JP 2006-281856 A 実開平６−５３０６８号公報Japanese Utility Model Publication No. 6-53068

本考案が解決しようとする課題は、ボルトやナット又は被締結部材を特殊な構造に加工する必要がなく、汎用性に富み、構造が簡単で、安価に製作できる共回り防止用冶具を提供する処にある。   SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a jig for preventing co-rotation that does not need to process bolts, nuts or fastening members into a special structure, is versatile, has a simple structure, and can be manufactured at low cost. There is in place.

前記の課題を解決する本考案は、ナットを回すときに該ナットが螺合するボルト又は該ボルトに螺合する他のナットが共回りしないようにするための、共回り防止用冶具に係る。   This invention which solves the above-mentioned subject relates to a jig for preventing co-rotation in order to prevent a bolt screwed into the nut or another nut screwed into the bolt from rotating together when the nut is turned.

本考案に係る共回り防止用冶具は、ボルト又は他のナットに着脱可能に係止される係止部材と、該係止部材から延設されたアームと、該アームの先端に取付けられた錘とを備えている。   A jig for preventing co-rotation according to the present invention includes a locking member detachably locked to a bolt or other nut, an arm extending from the locking member, and a weight attached to the tip of the arm. And.

係止部材は、ボルトの軸部又は頭部又は該ボルトに螺合する他のナットに被せる囲繞部材を備えている。囲繞部材は全体としてリング形又は短尺な筒形を呈し、一体成形されたものであってもよいし又は相互に関係付けられた二つの部材片からなるものであってもよい。例えば、二つの半割れ状の部材片の一端部がヒンジで関係付けられており、他端部がネジ止めされるようになっているもの、また断面逆Ｕ字形の部材片の端部に該部材片の底蓋となる他の部材片がネジ止めされるようになっているもの等が挙げられる。   The locking member includes a surrounding member that covers the shaft or head of the bolt or another nut that is screwed to the bolt. The surrounding member has a ring shape or a short cylindrical shape as a whole, and may be integrally molded or may be composed of two mutually related member pieces. For example, one end of two half-cracked member pieces is related by a hinge and the other end is screwed, or the end of a member piece having an inverted U-shaped cross section The thing etc. which the other member piece used as the bottom cover of a member piece is screwed are mentioned.

囲繞部材は、ボルトの頭部の外周部又は該ボルトに螺合する他のナットの外周部に係合する内周部を有するものである場合、ボルトの頭部又は他のナットに宛てがうだけで、ボルトの頭部又は他のナットに係止される。代表的には、囲繞部材の内周部をボルトの頭部の外周部又は他のナットの外周部に嵌め込む場合である。しかし、囲繞部材がボルトのネジ部又は頭部又は該ボルトに螺合する他のナットに単に被せるだけのものである場合、言い替えれば、そのままでは囲繞部材がボルトのネジ部又は頭部又は他のナットに係止されるものではない場合、かかる囲繞部材をボルトのネジ部又は頭部又は他のナットに係止するためのストッパ部材が必要である。例えば、全体として短尺な筒形を呈する囲繞部材の側面にネジ溝を施した貫通孔を設け、この貫通孔にストッパ用のネジを螺合してその先端部をボルトのネジ部又は頭部又は他のナットに当接させつつ締め付けて、囲繞部材を係止させるような手段が必要である。   When the surrounding member has an inner peripheral portion that engages with an outer peripheral portion of the head portion of the bolt or an outer peripheral portion of another nut that is screwed to the bolt, the surrounding member is directed to the head portion of the bolt or the other nut. Just be locked to the head of the bolt or other nut. Typically, this is a case where the inner periphery of the surrounding member is fitted into the outer periphery of the bolt head or the outer periphery of another nut. However, when the surrounding member is simply put on the threaded portion or head of the bolt or other nut screwed to the bolt, in other words, the surrounding member remains the threaded portion or head or other portion of the bolt as it is. When not being locked to the nut, a stopper member for locking the surrounding member to the threaded portion of the bolt or the head or other nut is necessary. For example, a through-hole having a thread groove is provided on the side surface of an enclosing member that has a short cylindrical shape as a whole, and a stopper screw is screwed into the through-hole so that the tip of the screw is a screw portion or head of a bolt or A means for locking the surrounding member by tightening while abutting against another nut is required.

本考案に係る共回り防止用冶具において、係止部材から延設されたアームの長さ及び該アームの先端に取付けられた錘の質量は、ナットを回して締め付けるときや緩めるときに必要とされるトルクに応じて適宜に設定することができるが、概ね下記の数１を満足する範囲とする。   In the jig for preventing co-rotation according to the present invention, the length of the arm extending from the locking member and the mass of the weight attached to the tip of the arm are required when the nut is tightened or loosened. Although it can be set as appropriate according to the torque to be determined, it should be in a range that generally satisfies the following equation (1).

Figure 0003151073
Figure 0003151073

数１において、
θ：係止部材を係止したボルト又は他のナットの鉛直面からの錘の重心の振れ角度で、０＜θ＜９０の範囲内の角度。 In Equation 1,
θ: The swing angle of the center of gravity of the weight from the vertical surface of the bolt or other nut that locks the locking member, and an angle in the range of 0 <θ <90.

数１は、錘の質量が大きい程、またアームの長さが長い程、大きな力のモーメントが得られ、ナットを回して締め付けたり又は緩めるときに必要とされるトルクがかかる力のモーメント未満であれば、ボルトや他のナットの共回りを防止しつつナットを回すことができることを示している。   Equation 1 indicates that the greater the mass of the weight and the longer the arm, the greater the moment of force is obtained, and less than the moment of force applied when the nut is tightened or loosened. If so, it is shown that the nut can be turned while preventing the bolt and other nuts from rotating together.

本考案に係る共回り防止用冶具には、ボルトやナット又は被締結部材を特殊な構造に加工する必要がなく、汎用性に富み、また構造が簡単で、安価に製作できるという効果がある。   The jig for preventing co-rotation according to the present invention does not need to process bolts, nuts, or members to be fastened into a special structure, has a versatility, is simple in structure, and can be manufactured at low cost.

本考案に係る共回り防止用冶具の一実施例をボルト及びナットとの関係で示す正面図。The front view which shows one Example of the jig for co-rotation prevention which concerns on this invention in relation to a volt | bolt and a nut. 図１のＡ−Ａ線断面図。AA sectional view taken on the line AA of FIG. 本考案に係る共回り防止用冶具の他の一実施例をボルト及びナットとの関係で示す正面図。The front view which shows another Example of the jig for joint rotation prevention which concerns on this invention in relation to a volt | bolt and a nut. 図３のＢ−Ｂ線断面図。BB sectional drawing of FIG. 本考案に係る共回り防止用冶具の他の一実施例をボルト及びナットとの関係で示す正面図。The front view which shows another Example of the jig for joint rotation prevention which concerns on this invention in relation to a volt | bolt and a nut. 図５のＣ−Ｃ線断面図。The CC sectional view taken on the line of FIG. 本考案に係る共回り防止用冶具の他の一実施例をボルト及びナットとの関係で示す側面図。The side view which shows another Example of the jig for co-rotation prevention which concerns on this invention in relation to a volt | bolt and a nut. 本考案に係る共回り防止用冶具の他の一実施例をボルト及びナットとの関係で示す側面図。The side view which shows another Example of the jig for co-rotation prevention which concerns on this invention in relation to a volt | bolt and a nut. 図８の一実施例についてナットから外した状態を示す側面図。The side view which shows the state removed from the nut about one Example of FIG.

図１及び図２に示した一実施例について説明する。頭部のないネジ部だけのボルト（以下、単に通しボルトという）１１にナット２１と他のナット２２が螺合している。この一実施例では、ナット２１と他のナット２２との間で、通しボルト１１を通した図示しない複数の被締結部材を締結するようになっている。通しボルト１１には、他のナット２２の右手側にて共回り防止用冶具３１が係止されている。共回り防止用冶具３１は、係止部材４１と、係止部材４１から延設されたアーム５１と、アーム５１の先端に取付けられた錘６１とを備えている。係止部材４１は、通しボルト１１の外径よりもやや大きい内径を有する短尺な円筒形の囲繞部材４１ａと、ストッパ部材としての小ネジ４１ｂとを備え、小ネジ４１ｂは囲繞部材４１ａの側面に設けられた貫通孔のネジ溝と螺合し、その先端部が通しボルト１１に当接した状態で締め付けられている。また錘６１はやや肉厚の円板形になっている。   The embodiment shown in FIGS. 1 and 2 will be described. A nut 21 and another nut 22 are screwed into a bolt 11 (hereinafter simply referred to as a through bolt) 11 having only a screw portion without a head. In this embodiment, a plurality of fastened members (not shown) through which the through bolts 11 are passed are fastened between the nut 21 and the other nut 22. A co-rotation prevention jig 31 is locked to the through bolt 11 on the right hand side of the other nut 22. The co-rotation prevention jig 31 includes a locking member 41, an arm 51 extending from the locking member 41, and a weight 61 attached to the tip of the arm 51. The locking member 41 includes a short cylindrical surrounding member 41a having an inner diameter slightly larger than the outer diameter of the through bolt 11 and a small screw 41b as a stopper member. The small screw 41b is provided on a side surface of the surrounding member 41a. It is screwed into the threaded groove of the provided through hole, and is tightened in a state where its tip end is in contact with the through bolt 11. Further, the weight 61 has a slightly thick disk shape.

図３及び図４に示した他の一実施例について説明する。通しボルト１２にナット２３と他のナット２４が螺合している。この一実施例では、ナット２３と他のナット２４との間で、通しボルト１２を通した図示しない複数の被締結部材を締結するようになっており、右手側の他のナット２４に共回り防止用冶具３２が係止されている。共回り防止用冶具３２は、係止部材４２と、係止部材４２から延設されたアーム５２と、アーム５２の先端に取付けられた錘６２とを備えている。係止部材４２は、他のナット２４の外周部と係合する内周部を有する短尺な筒形の囲繞部材４２ａからなっており、図面の場合には他のナット２４の外周部に囲繞部材４２ａの内周部が嵌合している。また錘６２はやや肉厚の円板形になっている。   Another embodiment shown in FIGS. 3 and 4 will be described. A nut 23 and another nut 24 are screwed to the through bolt 12. In this embodiment, a plurality of fastened members (not shown) through which through bolts 12 are passed are fastened between the nut 23 and the other nut 24, and rotate together with the other nut 24 on the right hand side. The prevention jig 32 is locked. The co-rotation prevention jig 32 includes a locking member 42, an arm 52 extending from the locking member 42, and a weight 62 attached to the tip of the arm 52. The locking member 42 is composed of a short cylindrical surrounding member 42 a having an inner peripheral portion that engages with the outer peripheral portion of another nut 24. In the case of the drawing, the surrounding member is disposed on the outer peripheral portion of the other nut 24. The inner periphery of 42a is fitted. Further, the weight 62 has a slightly thick disk shape.

図５及び図６に示した一実施例について説明する。頭部１３ａを有するボルト１３にナット２５が螺合している。この一実施例では、ボルト１３の頭部１３ａとナット２５との間で、ボルト１３のネジ部１３ｂを通した図示しない複数の被締結部材を締結するようになっており、ボルト１３の頭部１３ａに共回り防止用冶具３３が係止されている。共回り防止用冶具３３は、係止部材４３と、係止部材４３から延設されたアーム５３と、アーム５３の先端に取付けられた錘６３とを備えている。係止部材４３は、ボルト１３の頭部１３ａの外周部と係合する内周部を有する短尺な筒形の囲繞部材４３ａからなっており、図面の場合にはボルト１３の頭部１３ａの相対する二つの外周面に囲繞部材４３ａの相対する二つの内周面が面接触した状態で嵌め込まれている。また錘６３はやや肉厚の円板形になっている。   One embodiment shown in FIGS. 5 and 6 will be described. A nut 25 is screwed onto the bolt 13 having the head 13a. In this embodiment, between the head 13a of the bolt 13 and the nut 25, a plurality of members to be fastened (not shown) through the threaded portion 13b of the bolt 13 are fastened. A co-rotation preventing jig 33 is locked to 13a. The co-rotation prevention jig 33 includes a locking member 43, an arm 53 extending from the locking member 43, and a weight 63 attached to the tip of the arm 53. The locking member 43 is composed of a short cylindrical surrounding member 43a having an inner peripheral portion engaged with the outer peripheral portion of the head portion 13a of the bolt 13, and in the case of the drawing, The two inner peripheral surfaces opposite to each other of the surrounding member 43a are fitted into the two outer peripheral surfaces. Further, the weight 63 has a slightly thick disk shape.

図７に示した一実施例について説明する。通しボルト１４に図示しないナット２６（以下、ナット２６は図示しない）と他のナット２７が螺合している。この一実施例では、ナット２６と他のナット２７との間で、通しボルト１４を通した図示しない複数の被締結部材を締結するようになっており、この限りでは図１及び図２に示した一実施例と同様の構成になっていて、他のナット２７に共回り防止用冶具３４が係止されている。共回り防止用冶具３４は、係止部材４４と、係止部材４４から延設されたアーム５４と、アーム５４の先端に取付けられた錘６４とを備えている。係止部材４４は、他のナット２７の外周部と係合する内周部を有する逆Ｕ字形の部材片４４ａとその底蓋となる他の部材片４４ｂとからなる短尺な筒形の囲繞部材４４ｃと、ストッパ部材としての小ネジ４４ｄ，４４ｅとを備えており、図面の場合、他のナット２７の四つの角部で逆Ｕ字形の部材片４４ａの内周部が点接触し、また他のナット２７の一つの外周面に底蓋となる他の部材片４４ｂの内周面が面接触した状態で、逆Ｕ字形の部材片４４ａの両端部に底蓋となる他の部材片４４ｂが小ネジ４４ｄ，４４ｅで締め付けられている。アーム５４は底蓋となる他の部材片４４ｂから延設されており、錘６４はやや肉厚の円板形になっている。   One embodiment shown in FIG. 7 will be described. A nut 26 (not shown) (not shown) and another nut 27 are screwed to the through bolt 14. In this embodiment, a plurality of members to be fastened (not shown) that pass through bolts 14 are fastened between the nut 26 and the other nut 27, and as far as shown in FIGS. Further, the configuration is the same as that of the first embodiment, and a common rotation prevention jig 34 is locked to the other nut 27. The co-rotation prevention jig 34 includes a locking member 44, an arm 54 extending from the locking member 44, and a weight 64 attached to the tip of the arm 54. The locking member 44 is a short cylindrical enclosure member composed of an inverted U-shaped member piece 44a having an inner peripheral portion engaged with the outer peripheral portion of another nut 27 and another member piece 44b serving as a bottom cover thereof. 44c and small screws 44d and 44e as stopper members. In the case of the drawing, the inner peripheral portion of the inverted U-shaped member piece 44a is in point contact with the four corners of the other nut 27, and the like. In the state where the inner peripheral surface of the other member piece 44b serving as the bottom cover is in surface contact with one outer peripheral surface of the nut 27, the other member pieces 44b serving as the bottom cover are formed at both ends of the inverted U-shaped member piece 44a. It is tightened with small screws 44d and 44e. The arm 54 is extended from the other member piece 44b which becomes a bottom cover, and the weight 64 has a slightly thick disk shape.

図８及び図９に示した一実施例について説明する。通しボルト１５に図示しないナット２８（以下、ナット２８は図示しない）と他のナット２９が螺合している。この一実施例では、ナット２８と他のナット２９との間で、通しボルト１５を通した図示しない複数の被締結部材を締結するようになっており、この限りでは図１及び図２に示した一実施例と同様の構成になっていて、他のナット２９に共回り防止用冶具３５が係止されている。共回り防止用冶具３５は、係止部材４５と、係止部材４５から延設されたアーム５５と、アーム５５の先端に取付けられた錘６５とを備えている。係止部材４５は、他のナット２９の外周部と係合する内周部を有する半割れ状の部材片４５ａと他の半割れ状の部材片４５ｂとからなる短尺な筒形の囲繞部材４５ｃと、ストッパ部材としての小ネジ４５ｅ及び小ナット４５ｆとを備えており、図面の場合、他のナット２９の外周面にヒンジ４５ｄで関係付けられた二つの半割れ状の部材片４５ａ，４５ｂの内周面が接触した状態で小ネジ４５ｅ及び小ナット４５ｆにより相互に締め付けられている。アーム５５は下側に位置する半割れ状の部材片４５ｂから延設されており、錘６５はやや肉厚の円板形になっている。   One embodiment shown in FIGS. 8 and 9 will be described. A nut 28 (not shown) (not shown) and another nut 29 are screwed to the through bolt 15. In this embodiment, a plurality of fastening members (not shown) through which through bolts 15 are passed are fastened between a nut 28 and another nut 29, and as far as shown in FIGS. In addition, the configuration is the same as that of the first embodiment, and the co-rotation prevention jig 35 is locked to the other nut 29. The co-rotation prevention jig 35 includes a locking member 45, an arm 55 extending from the locking member 45, and a weight 65 attached to the tip of the arm 55. The locking member 45 is a short cylindrical surrounding member 45c composed of a half-cracked member piece 45a having an inner peripheral part engaged with the outer peripheral part of another nut 29 and another half-cracked member piece 45b. And a small screw 45e and a small nut 45f as stopper members. In the case of the drawing, two half-cracked member pieces 45a and 45b related to the outer peripheral surface of the other nut 29 by a hinge 45d are provided. The inner circumferential surfaces are in contact with each other by a small screw 45e and a small nut 45f. The arm 55 extends from a half-cracked member piece 45b located on the lower side, and the weight 65 has a slightly thick disk shape.

１１，１２，１４，１５ 通しボルト
１３ ボルト
１３ａ 頭部
２１〜２５，２７，２９ ナット
３１〜３５ 共回り防止用冶具
４１〜４５ 係止部材
４１ａ，４２ａ，４３ａ，４４ｃ，４５ｃ 囲繞部材
４１ｂ，４４ｄ，４４ｅ，４５ｅ ストッパ部材としての小ネジ
５１〜５５ アーム
６１〜６５ 錘 11, 12, 14, 15 Through bolt 13 Bolt 13a Head 21-25, 27, 29 Nut 31-35 Co-rotation prevention jig 41-45 Locking member 41a, 42a, 43a, 44c, 45c Surrounding member 41b, 44d , 44e, 45e Small screw as stopper member 51-55 Arm 61-65 weight

Claims (4)

ナットを回すときに該ナットが螺合するボルト又は該ボルトに螺合する他のナットが共回りしないようにするための冶具であって、ボルト又は他のナットに着脱可能に係止される係止部材と、該係止部材から延設されたアームと、該アームの先端に取付けられた錘とを備えて成ることを特徴とする共回り防止用冶具。   A jig for preventing a bolt that is screwed into the nut or another nut that is screwed into the bolt from rotating together when the nut is rotated, and is a releasably locked to the bolt or another nut. A jig for preventing co-rotation, comprising: a stop member; an arm extending from the locking member; and a weight attached to a tip of the arm. 係止部材が、囲繞部材と、該囲繞部材をボルト又は他のナットに止めるためのストッパ部材とからなるものである請求項１記載の共回り防止用冶具。   The jig for preventing co-rotation according to claim 1, wherein the locking member comprises an enclosing member and a stopper member for fixing the enclosing member to a bolt or other nut. 係止部材が、ボルトの頭部の外周部又は他のナットの外周部と係合する内周部を有する囲繞部材からなるものである請求項１記載の共回り防止用冶具。   The jig for preventing co-rotation according to claim 1, wherein the locking member is made of an enclosure member having an inner peripheral portion engaged with an outer peripheral portion of a bolt head or an outer peripheral portion of another nut. 囲繞部材が、相互に関係付けられた二つの部材片からなるものである請求項２又は３記載の共回り防止用冶具。   The jig for preventing co-rotation according to claim 2 or 3, wherein the surrounding member is composed of two mutually related member pieces.
JP2009001892U 2009-03-27 2009-03-27 Co-rotation prevention jig Expired - Lifetime JP3151073U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109908504A (en) * 2019-03-26 2019-06-21 国网湖北省电力公司咸宁供电公司 Safety belt suspension device is used in a kind of maintenance of main transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109908504A (en) * 2019-03-26 2019-06-21 国网湖北省电力公司咸宁供电公司 Safety belt suspension device is used in a kind of maintenance of main transformer

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