JP3958644B2

JP3958644B2 - Platform load detection device for aerial work platforms

Info

Publication number: JP3958644B2
Application number: JP2002203548A
Authority: JP
Inventors: 真克前田
Original assignee: Aichi Corp
Current assignee: Aichi Corp
Priority date: 2002-07-12
Filing date: 2002-07-12
Publication date: 2007-08-15
Anticipated expiration: 2022-07-12
Also published as: JP2004043121A

Description

【０００１】
【発明の属する技術分野】
本発明は、高所作業車の作業台荷重検出装置に関し、更に詳細には、ブームの先端に上下に揺動自在に取り付けられた作業台の荷重を検出可能に構成された高所作業車の作業台荷重検出装置に関する。
【０００２】
【従来の技術】
このような作業台荷重検出装置を搭載する高所作業車は、走行可能なトラック車両をベースに構成され、作業装置を搭載して構成されるのが一般的である。作業装置は、車両に搭載されて旋回動可能な旋回台と、旋回台に起伏動自在に枢結されて伸縮動自在なブームと、ブームの先端部に上下に揺動自在に枢結されてブームの起伏角度に拘わらず垂直に保持される垂直ポストと、垂直ポストに取り付けられた作業台とを有して構成されているものがある。
【０００３】
このような作業装置には、作業台からブームの先端部に作用する荷重を検出してブームを介して車体に作用する転倒方向モーメントを算出することが出来るように、ブームの先端部と作業台との間に作業台の荷重を検出する作業台荷重検出装置が設けられているものがある。この作業台荷重検出装置９０は、図１０に示すように、垂直ポスト１７及び作業台１９間に配設され、それぞれ一端が垂直ポスト１７に接続されて作業台１９側へ延び、それぞれ他端が作業台１９の垂直ポスト１７に対向する側の側面に接続され、上下に所定の間隔を有して配置されて作業台１９を支持する上リンク部材９１及び下リンク部材９２を有してなり、垂直ポスト１７に対して作業台１９を平行状態のままで上下動可能に構成された平行リンク機構９３と、一端が垂直ポスト１７に接続されて作業台１９側へ延びた中間部材３１と、中間部材３１の先端部に取り付けられて、平行リンク機構９３の上リンク部材９１と作業台１９との間を繋ぐ接続部材９４の下面に押圧当接して作業台１９の荷重を検出するロードセル４３とを有して構成されているものがある。
【０００４】
このような作業台荷重検出装置９０によれば、作業台１９の荷重は、上リンク部材９１に作用する引っ張り力、下リンク部材９２に作用する圧縮力及び荷重を検出するロードセル４３に作用する下方向の圧縮力とで釣り合って、作業台１９が平行リンク機構に支持されている。
【０００５】
ここで、作業台１９は上リンク部材９１及び下リンク部材９２の各先端部に対して枢結（例えば、ピン結合）されているので、作業台１９から平行リンク機構９３に作用するモーメントが上リンク部材９１及び下リンク部材９２に対して曲げモーメントとして作用することはない。このため、接続部材９４が枢結された上リンク部材９１への枢結位置は上下動することはなく、作業台１９はこの枢結位置を揺動中心として上下揺動し、接続部材９４の下面にロードセル４３が押圧当接して、ロードセル４３が作業台１９の荷重を高い精度で検出することができる。
【０００６】
【発明が解決しようとする課題】
しかしながら、平行リンク機構は、上リンク部材及び下リンク部材の各両端部が垂直ポスト及び作業台に対して上下に揺動できるように枢結機構９５を介して接続されている。このため、平行リンク機構は構造が複雑になるとともに、部品数が増加して、製造コストが増加するという問題が生じる。
【０００７】
本発明は、このような問題に鑑みてなされたものであり、作業台の荷重を高い精度で検出可能であり、且つ製造コストが安価な作業台荷重検出装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
前記課題を解決するために本発明に係わる高所作業車の作業台荷重検出装置は、車体と、車体に少なくとも起伏動自在に取り付けられたブームと、ブームの先端部に基部が上下に揺動自在に取り付けられて上方へ延び、ブームの起伏角度に拘わらず垂直に保持される垂直ポストと、垂直ポストに水平状態に取り付けられた作業台とを有してなる高所作業車の作業台荷重検出装置であって、垂直ポスト及び作業台間に配設され、それぞれ一端が垂直ポストに一体に結合されて作業台側へ延び、それぞれ他端が作業台の垂直ポストに対向する側の側面に一体に結合され、上下に所定の間隔を有して平行に配置されて垂直ポストに対して作業台を支持する上支持部材及び下支持部材と、上支持部材及び下支持部材の上下間隔内に配設され、基部側端部が垂直ポストに一体に結合されて片持ち支持された状態で作業台側へ延びた中間部材と、中間部材の先端部上面側に上支持部材の下面に当接して取り付けられ、作業台の荷重に応じて下方向に撓む上支持部材の下面からの押圧力を検出して作業台の荷重を検出する作業台荷重検出手段（例えば、実施形態におけるロードセル４３）とを有し、上支持部材及び下支持部材は、同一材料から作られ、上支持部材の断面係数が下支持部材の断面係数よりも大きくなるように構成されている。
【０００９】
上記構成の作業台荷重検出装置によれば、垂直ポスト及び作業台間に上下に所定の間隔を有した上支持部材及び下支持部材を平行に配設し、これらの部材間に垂直ポストに接続されて片持ち支持された状態の中間部材を配設し、この中間部材の先端部に作業台荷重検出手段を設けることで、作業台の荷重は上支持部材及び下支持部材の先端部に曲げモーメントとして作用してこれらの部材を下方へ撓ませ、この上支持部材の撓みに応じた押圧力を作業台荷重検出手段が作業台の荷重として検出することになる。ここで、作業台の荷重による上支持部材及び下支持部材に作用するモーメントは上支持部材の引っ張り力及び下支持部材の圧縮力によって略打ち消され、上支持部材及び下支持部材に作用する曲げモーメントの影響を小さくしている。このため、作業台荷重検出手段は作業台荷重を高い精度で検出することができる。また、作業台検出装置は上支持部材、下支持部材、中間部材及び作業台荷重検出手段から構成されるので、構造が簡素化される。このため、製造コストが安価な作業台荷重検出装置を提供することができる。また、作業台は上支持部材及び下支持部材を介して垂直ポストにラーメン構造のように接続され、曲げモーメントの影響をある程度受けることになる。ここで、作業台は上支持部材及び下支持部材のそれぞれの先端部に接続されているので、作業台の荷重による上支持部材及び下支持部材の撓み量は同一になる。このため、上支持部材の断面係数を下支持部材の縦断面係数よりも大きくし、且つ上支持部材及び下支持部材の材料を同一材料で形成した場合には、作業台の荷重のうち上支持部材に作用する荷重を下支持部材に作用する荷重よりも大きくすることができる。その結果として作業台荷重検出手段に作用する荷重の大きさを作業台の荷重に近づけることができ、作業台荷重検出装置の荷重値の検出精度をより向上させることができる。
【００１０】
上記構成の作業台荷重検出装置において、垂直ポストに取り付けられた中間部材の基部側に上方へ突出する基部側段部が形成され、上支持部材はその一端が中間部材の基部側段部上に一体に結合されて作業台側へ延び、上支持部材の他端が作業台の側面に一体に結合され、作業台及び垂直ポスト間に接続された下支持部材の長さは、中間部材の基部側段部及び作業台の側面間に接続された上支持部材の長さよりも長いようにすることが好ましい。
【００１１】
上記構成の作業台荷重検出装置によれば、作業台は上支持部材及び下支持部材を介して垂直ポストにラーメン構造のように接続され、曲げモーメントの影響をある程度受けることになる。また、上支持部材及び下支持部材の先端部は作業台に接続されているので、上支持部材及び下支持部材の撓み量は同一量になる。ここで、基部側端部から突出する上支持部材の長さを一定にした状態で下支持部材の長さを変化させると、下支持部材の長さが長くなるほど下支持部材の先端部に作用する負荷を小さくすることができる。また、下支持部材の長さを一定にした状態で基部側端部から突出する上支持部材の長さを変化させると、上支持部材の長さが短くなるほど上支持部材の先端部に作用する負荷を大きくすることができる。その結果、下支持部材の長さをできる限り長くし、上支持部材の長さを下支持部材の長さよりも短くすれば、下支持部材に作用する負荷を小さくすることができ、且つ上支持部材に作用する負荷を大きくすることができる。従って、上支持部材に作用する作業台からの負荷を作業台の荷重に近づけることができ、作業台荷重検出装置の荷重値の検出精度を更に向上させることができる。
【００１２】
上記構成の作業台荷重検出装置において、上支持部材の一方の端部が垂直ポスト又は作業台にボルト結合されて着脱可能に一体結合され、上支持部材の他方の端部が作業台又は垂直ポストに固着状態で取り付けられ、上支持部材の一方の端部と同一側に位置する下支持部材の端部が垂直ポスト又は作業台に固着状態で取り付けられ、上支持部材の他方の端部と同一側に位置する下支持部材の端部が作業台又は垂直ポストにボルト結合されて着脱可能に一体結合されている構成でも良い。
【００１３】
上記構成の作業台荷重検出装置によれば、上支持部材が垂直ポスト又は作業台に着脱可能に取り付けられる端部と、下支持部材が垂直ポスト又は作業台に着脱可能に取り付けられる端部の取り付け位置を反対側に配置することで、これらの端部が同一側に取り付けられる場合と比較して、着脱部の座面すべり強度を強くすることができる。
【００１４】
上記構成の作業台荷重検出装置において、作業台に上方向の力が作用したときに少なくとも下支持部材が上方へ撓むのを規制する撓み規制手段（例えば、実施形態における撓み規制部材６０）を設けてもよい。
【００１５】
上記構成の作業台荷重検出装置によれば、撓み規制手段を設けることで、作業台に上方向の力が作用しても撓み規制手段が少なくとも下支持部材の上方へ撓みを規制する。このため、作業台が上方向へ移動することにより下支持部材に応力集中が生じて下支持部材が破損する事態を未然に防止することができる。
【００１６】
上記構成の作業台荷重検出装置において、作業台の側面に垂直ポスト側へ突出する接続部材を設け、接続部材の先端に形成された面部に作業台の側面から延びる法線と所定の傾斜角度を有して延びる上支持部材の延伸中心軸線が直交するように少なくとも上支持部材の先端部が面部に接続されるようにしてもよい。
【００１７】
上記構成の作業台荷重検出装置によれば、接続部材の面部に作業台の側面から延びる法線と所定の傾斜角度を有して延びる上支持部材の延伸中心軸線が直交するように上支持部材の先端部を面部に接続させることで、上支持部材の先端部に作用する作業台からの捻れトルクを上支持部材の延伸中心軸線を中心として上支持部材の幅方向に均等に作用させることができる。このため、上支持部材に当接する作業台荷重検出手段の当接位置を延伸中心軸線の垂直方向を通る垂直面内に位置させれば、上支持部材が捻れてもロードセルにより検出される作業台荷重の検出精度を高い状態に維持させることができる。
【００１８】
上記構成の作業台荷重検出装置において、中間部材は内部に空間部を有して箱状に形成され、中間部材の先端側上部に上方へ開口して空間部に連通する先端孔部を形成し、先端孔部よりも下方の空間部内に作業台荷重検出手段（例えば、実施形態におけるロードセル４３，距離検出センサ４５）を設け、上支持部材又は作業台に取り付けられて上下に延びて先端孔部を挿通し、上支持部材が撓むと上下に移動して上支持部材の撓み量を作業台荷重検出手段に伝達する撓み伝達手段（例えば、実施形態における撓み伝達部材５２）を有してなるようにしてもよい。
【００１９】
上記構成の作業台荷重検出装置によれば、箱状に形成した中間部材の先端内部に作業台荷重検出手段を設けることで、中間部材が中実の厚板で構成された場合と比較して、中間部材自体の重量を軽減することができ、且つ中間部材の縦剛性を向上させることができる。また、縦剛性の向上により中間部材の撓み量が減少するので、上支持部材の撓み量と作業台荷重検出手段に作用する撓み量を同一量により近づけることができ、作業台荷重検出装置により検出される作業台荷重の検出精度を高い状態に維持させることができる。また、作業台荷重検出手段は中間部材で覆われるようにして空間部内に設置されるので、中間部材が作業台荷重検出手段を保護する保護カバーとしての機能も兼ねることになり、作業台荷重検出手段の損傷を未然に防止することができる。
【００２０】
【発明の実施の形態】
以下、本発明の好ましい実施の形態を図１から図９に基づいて説明する。本実施の形態は、伸縮動可能に構成されたブームの先端に作業台を備えた高所作業車の態様を示す。
【００２１】
先ず、本発明に係わる作業台荷重検出装置を説明する前に、この作業台荷重検出装置を搭載した高所作業車を説明する。高所作業車１は、図１に示すように、トラック車両をベースとして構成され、車体３の前後の左右両端部に車輪４を配設して走行可能であり、車体３の前部に運転キャビン５が設けられ、車体３の前後の左右両側部に車体３を持ち上げ支持するジャッキ７が配設されている。車体３の後部には旋回動自在な旋回台９が取り付けられ、旋回台９は車体３に内臓された図示しない旋回モータにより旋回動可能に構成されている。この旋回台９の上部には基部が上下揺動自在に枢結されたブーム１１が取り付けられている。ブーム１１は起伏シリンダ１３により起伏動可能である。
【００２２】
ブーム１１はその基端側から基端ブーム１１ａ、中間ブーム１１ｂ、先端ブーム１１ｃを入れ子式に組み合わされて伸縮動自在であり、内臓された伸縮シリンダ１５により伸縮動可能に構成されている。先端ブーム１１ｃの先端部には下部が上下に揺動可能に枢結されて上方へ延びる垂直ポスト１７が設けられ、垂直ポスト１７はこれと先端ブーム１１ｃとの間に設けられた図示しないレベリングシリンダによりブーム１１の起伏角度に拘わらず垂直状態に保持されている。垂直ポスト１７の側面には後述する作業台荷重検出装置３０が水平旋回動（首振り動）可能に取り付けられ、作業台荷重検出装置３０の先端部に有底容器状の作業台１９が作業台ブラケット２０を介して水平状態に取り付けられている。作業台１９にはブーム１１の旋回、起伏及び伸縮動の駆動を操作するとともに、作業台１９の旋回動（首振り動）の駆動を操作する操作装置２１が配設されている。
【００２３】
次に、このように構成された高所作業車１に設けられた作業台１９の荷重を検出する作業台荷重検出装置３０について説明する。なお、図２（ａ）は作業台荷重検出装置３０の平面図を示し、図２（ｂ）は作業台荷重検出装置３０の側面図を示す。作業台荷重検出装置３０は、図２に示すように、垂直ポスト１７の上部に右端部が固着されて片持ち支持された状態で作業台１９側へ水平方向に延びた中間部材３１と、中間部材３１よりも上方側に配置され、作業台１９の垂直ポスト１７に対向する側の側面１９ａに固着されて垂直ポスト１７側へ水平方向に延び、先端部が中間部材３１の基部の上面に着脱自在に取り付けられた上支持部材３５と、中間部材３１よりも下方側に配置され、作業台１９に対向する側の垂直ポスト１７の側面１７ａに固着されて作業台側へ水平方向に延び、先端部が作業台１９の底部に着脱自在に取り付けられた下支持部材３９と、中間部材３１の先端部に取り付けられ、上端部が作業台１９の荷重に応じて撓む上支持部材３５の下面と押圧当接して作業台１９の荷重を検出するロードセル４３とを有して構成されている。なお、作業台荷重検出装置３０の別の構成については後述する。
【００２４】
中間部材３１は縦断面形状が矩形状で水平に延びる板状部材であり、垂直ポスト１７に固着された側の基部３１ａと、基部３１ａの先端部から作業台１９側へ突出した先端部３１ｂとを有して構成されている。基部３１ａの上部には上方へ突出する段部３１ｃが形成され、この段部３１ｃの上面は水平面状に形成され、この上面に上支持部材３５の先端部が複数のボルト４７を介して基部３１ａに取り付けられている。複数のボルト４７は中間部材３１の前後方向（図２（ａ）の左右方向）に延びる中心軸線Ｓを境にして左右方向に均等に、且つ前後に整列された状態で配設されている。なお、ボルト４７の大きさについては後述する。
【００２５】
上支持部材３５の基端部は作業台１９の側面１９ａに溶接等により固着されている。また下支持部材３９の基部は垂直ポスト１７の側面１７ａに溶接等により固着され、下支持部材３９の先端部は作業台１９の底部に複数のボルト４９を介して取り付けられている。なお、ボルト４９の配置は前述した上支持部材３５を中間部材３１に取り付けるボルト４７に準じるのでその説明は省略する。
【００２６】
前述したように作業台１９は水平方向に延びる上支持部材３５及び下支持部材３９を介して垂直ポスト１７に接続され、上支持部材３５及び下支持部材３９のそれぞれの両端部は剛接された状態にある。即ち、作業台１９は上支持部材３５及び下支持部材３９を介して垂直ポスト１７に対していわゆるラーメン構造のように接続されている。このため、作業台１９の荷重は上支持部材３５及び下支持部材３９の先端部に曲げモーメントとして作用してこれらの部材を下方へ撓ませるが、作業台１９の荷重による上支持部材３５及び下支持部材３９に作用するモーメントは上支持部材３５の引っ張り力及び下支持部材３９の圧縮力によって略打ち消される。このため、上支持部材３５及び下支持部材３９は曲げモーメントを受けるがその程度は小さくなり、ロードセル４３に作用する荷重の大きさを作業台１９の荷重に近づけることができ、作業台荷重検出装置３０の荷重値の検出精度を向上させることができる。
【００２７】
ここで、前述したボルト４７、４９の取り付け位置について図３を更に追加して説明する。図３は、下支持部材３９の先端部が中間部材３１の基部から下方へ突出して形成された段部３１ｄの下面にボルト４７を介して取り付けられ、下支持部材３９の基部側が作業台１９に固着された一例を示している。即ち、図３は、下支持部材３９の先端部を取り付けるボルト４７と上支持部材３５の先端部を取り付けるボルト４７が同じ垂直ポスト１７側にある場合を示している。このような場合、作業台１９の側面１９ｂに垂直ポスト１７を揺動中心として旋回動（首振り動）させる方向の外力Ｅが作用し、且つボルト４７により上支持部材３５が中間部材３１に締め付け力Ｆで締め付けられていると想定した場合、外力Ｅにより作業台１９を旋回動させるモーメントＭ（Ｍ＝ＳＬ）に抗して、ボルト４７の座面に作用する抗モーメントの最大値Ｍ′は数１により表わされる。なお、説明の都合上、抗モーメントは上支持部材３５に取り付けられた複数のボルト４７のピッチ円直径に限って考慮し、図３（ａ）中のｆは摩擦力を示す。
【００２８】
【数１】
Ｍ′＝２μＦＬ′
但し、μはボルト４７ａ、４７ｂの座面と上支持部材３５の上面との間の摩擦係数を示し、
Ｌ′は図３（ａ）に示すボルト４７のピッチ円直径を示す。
【００２９】
一方、図２の場合、作業台１９の側面１９ｂに外力Ｅが作用し、上支持部材３５の先端部に取り付けられたボルト４７により上支持部材３５が中間部材３１に締め付け力Ｆで締め付けられていると想定した場合、外力Ｅにより作業台１９を旋回動させるモーメントＭ（Ｍ＝ＳＬ）に抗してボルト４７の座面に作用する抗モーメントの最大値Ｍ″は数２により表わされる。なお、説明の都合上、上支持部材３５に取り付けられた複数のボルト４７のうちの１本のボルト４７ａについて考慮する。
【００３０】
【数２】
Ｍ″＝μＦＬ
但し、Ｌは図２（ｂ）に示すボルト４７ａと下支持部材３９の先端部を取り付けているボルト４９との間の距離を示す。
【００３１】
これら数１及び数２を比較すると、２Ｌ′≪Ｌなる関係であれば、Ｍ′≪Ｍ″となる。即ち、図２に示すように、上支持部材３５の先端部を垂直ポスト１７側でボルト４７を介して取り付け、且つ下支持部材３９の先端部を作業台１９側でボルト４９を介して取り付けることで、図３の場合と比較して抗モーメントＭ″の大きさを大きくすることができる。このため、図２に示す上支持部材３５の先端部を中間部材３１に取り付けるためのボルト４７の径を大きくする必要がない。
【００３２】
このようにボルト４７、４９を介して中間部材３１に取り付けられた上支持部材３５及び作業台１９に取り付けられた下支持部材３９は、同一の材料（例えば、金属材料）で形成され、上支持部材３５の断面係数は下支持部材３９の断面係数よりも大きいように構成されている。具体的には、上支持部材３５と下支持部材３９の平面視形状は同一形状であり、上支持部材３５の厚さ寸法は下支持部材３９のそれよりも大きな寸法を有している。ここで、前述したように作業台１９は上支持部材３５及び下支持部材３９を介して垂直ポスト１７にラーメン構造のように接続され、上支持部材３５は曲げモーメントの影響をある程度受けることになる。しかしながら、上支持部材３５の厚さ寸法を下支持部材３９のそれよりも大きくすれば、作業台１９の荷重が上支持部材３５及び下支持部材３９に作用して、上支持部材３５及び下支持部材３９の端部がそれぞれ同一の撓み量で下方へ撓んだ場合、上支持部材３５に作用する荷重の大きさは、下支持部材３９に作用する荷重の大きさよりも大きくすることができる。
【００３３】
これは、上支持部材３５及び下支持部材３９に作用する作業台１９の荷重の多くが上支持部材３５に作用することを意味する。その結果として上支持部材３５に作用する荷重を作業台１９の荷重に近づけることができ、ロードセル４３により検出される荷重値の精度をより向上させることができる。なお、前述では、上支持部材３５及び下支持部材３９は同一材料で形成される場合を示したが、これに限るものではなく、別の材料で形成されてもよい。この場合、上支持部材３５の曲げ剛性（曲げこわさ）が下支持部材３９の曲げ剛性よりも大きくなるように材料や形状を選択し且つ形成する。
【００３４】
次に、上支持部材３５及び下支持部材３９のそれぞれの長さについて説明する。作業台荷重検出装置３０は、作業台１９の荷重によって上支持部材３５が撓み、この撓みによって上支持部材３５がロードセル４３を押圧当接して、ロードセル４３が作業台１９の荷重を検出するように構成されている。しかしながら、上支持部材３５が撓むと、下支持部材３９も同一の撓み量を有して下方へ撓みので、ロードセル４３が検出する検出値は作業台１９の真の荷重を検出することができない。即ち、ロードセル４３が検出する検出値は作業台１９の真の荷重から上支持部材３５及び下支持部材３９を下方へ撓ませるのに必要な押圧力を減算した値である。その結果、下支持部材３９を下方へ撓ませる押圧力が大きくなるほど、ロードセル４３が検出する検出値は作業台１９の真の荷重から遠ざかり、荷重検出精度を低下させることになる。
【００３５】
そこで、図４に示すように、下支持部材３９の長さが長短２種類（Ｌ２′<Ｌ２″）の下支持部材３９のそれぞれに同じ大きさの撓み量δを与えるのに必要な下支持部材３９に作用する荷重の大きさを考慮すると、下支持部材３９の長さが長い方が短い方よりも小さい力で撓み量δを得ることができると考えられる。その結果、図２（ｂ）に示すように、下支持部材３９の長さは図１に示す作業台１９が車両に格納されたときの格納姿勢等を考慮した許容できる長さのうちの最大限の長さＬ２に設定されている。
【００３６】
一方、図２に示すように、下支持部材３９の撓み量は前述したように大きくなると作業台荷重の検出精度を低下させるので、この撓み量は小さくしたい。このため、上支持部材３５の撓み量も小さくする必要がある。また、上支持部材３５には大きな荷重が作用するので、上支持部材３５をボルト４７で固定する部分の面積も大きくしたい。そこで、上支持部材３５の長さＬ１は下支持部材３９の長さＬ２よりも短い長さＬ１（Ｌ１<Ｌ２）に設定されている。その結果、上支持部材３５に作用する荷重の大きさを作業台１９の荷重に更に近づけることができ、作業台荷重検出装置３０の荷重検出精度をさらに向上させることができる。また、本発明に係わる作業台荷重検出装置３０は、上支持部材３５、下支持部材３９、中間部材３１及びロードセル４３で構成されているので、図１０に示すような上リンク部材９１及び下リンク部材９２を枢結する枢結機構９５が不要であり、少ない部品数で構成されて製造コストを安価にすることができる。
【００３７】
なお、図５に示すように、上支持部材３５の垂直ポスト１７への固着が確実に行なわれる場合には、上支持部材３５の垂直ポスト１７側の端部を垂直ポスト１７に直接に固着する。また下支持部材３９の作業台１９側の端部を作業台１９に直接に固着すれば、作業台荷重検出装置３０の構造がより簡素化し、作業台荷重検出装置３０のコストをより安価にすることができる。
【００３８】
また、本発明に係わる作業台荷重検出装置は、図２（ｂ）に示す作業台１９にこれを上方へ移動させる方向の外力Ｒが作用した場合には、上支持部材３５及び下支持部材３９が上方へ撓んでしまう。この場合、特に、下支持部材３９の垂直ポスト１７に固着された部分Ｑには、外力Ｒによる曲げモーメントと引っ張り力が作用して応力が集中し、部分Ｑが損傷する虞が生じる。そこで、このような損傷を未然に防止するため、図６に示す作業台荷重検出装置３０には上支持部材３５及び下支持部材３９が上方へ撓むのを規制する撓み規制部材６０が設けられている。
【００３９】
具体的には、図６（ａ）に示す撓み規制部材６０は中間部材３１の先端下部から下方へ突出し、この撓み規制部材６０の下部が下支持部材３９の上面に接触した状態で形成されている。また、図６（ｂ）に示す撓み規制部材６０は垂直ポスト１７に対抗する側の作業台１９の側面１９ａに垂直ポスト側へ突設され、この撓み規制部材６０の先端上面が中間部材３１の先端下面に接触した状態になるように配設されている。さらに、図６（ｃ）に示す撓み規制部材６０は、中間部材３１の先端部に上下に所定の間隔を有して水平方向に延びた上突出部材６３及び下突出部材６５のうちの上突出部材６３の先端部に形成された貫通孔を上下に挿通して摺動自在であって上支持部材３５に締結固定されるねじ部材であり、撓み規制部材６０の上下両端部にそれぞれナット６７、６８が螺合している。撓み規制部材６０を回転させるとこの上下位置が調整されて、下突出部材６５の先端側上面に設置されたロードセル４３への撓み規制部材６０の当接状態を調整することができ、上方のナット６７を回転させると撓み規制部材６０が上支持部材３５に固定される。また、下方のナット６８を回転させてナット６８の上面と上突出部材６３の下面を接触させた状態にすると、図２（ｂ）に示す作業台１９に上方へ移動させる外力Ｒが作用しても、上支持部材３５、ナット６７及び撓み規制部材６０を介してナット６８が上突出部材６３の底面に押圧当接して、作業台１９の上方への移動を規制し、その結果として下支持部材３９及び上支持部材３５の上方への撓みが規制される。
【００４０】
なお、図８（ａ）に示すように、撓み規制部材６０の先端部にボルト８０を上下方向に延びた状態で螺合させ、ナット８１でボルト８０を撓み規制部材６０に締結させるように構成することで、撓み規制部材６０の撓み量を調整することができ、且つボルト８０及びナット８１からなる簡易な撓み量調整機構を提供することができる。
【００４１】
また、本発明に係わる作業台荷重検出装置３０の上支持部材３５及び下支持部材３９（以下、これらをまとめて「支持部材３５、３９」と記す。）は、図７（ａ）に示すように、支持部材３５、３９が延伸する延伸中心軸線Ｕが作業台１９の側面１９ａに対して直交するように配設されない場合がある。このような場合、作業台１９の側面１９ａに垂直ポスト１７側へ突出して先端部が上下に延びる平面状の平面部７０ａを形成した接続部材７０を取り付け、この平面部７０ａに延伸中心軸線Ｕが直交するように支持部材３５、３９の先端部を平面部７０ａに固着させる。
【００４２】
このように、支持部材３５、３９の先端部を平面部７０ａに固着させることで、支持部材３５、３９の先端部に作用する作業台１９からの捻れトルクを延伸中心軸線Ｕを中心として支持部材３５、３９の幅方向（延伸中心軸線Ｕに直交するＨ方向）に均等に作用させることができる。このため、上支持部材３５に当接する図２（ａ）に示すロードセル４３の当接位置を延伸中心軸線Ｕの垂直方向を通る垂直面内に位置させれば、上支持部材３５が捻れてもロードセル４３により検出される作業台荷重の検出精度を高い状態で維持させることができる。なお、平面部７０ａに固着させる支持部材は上支持部材３５だけでもよい。
【００４３】
また、上支持部材３５及び下支持部材３９を接続させる接続部材７０の面部７０ｂは、図７（ｂ）に示すように、平面に限るものではなく、平面視において球面状に形成されてもよい。この場合、延伸中心軸線Ｕはこれが球面状の面部７０ｂと交わる交点Ｏを通る接線Ｔと直交するように配置され、且つ上支持部材３５及び下支持部材３９は延伸中心軸線Ｕに対して左右対象に取り付けられる。このように構成することで、図７（ａ）に示した場合と同様の効果を得ることができる。
【００４４】
なお、前述した作業台荷重検出装置３０は図８（ａ）に示すように構成されてもよい。即ち、中間部材３１は内部に空間部３１ｆを有して中空状に形成され、中間部材３１の先端部の上部に上方へ開口して空間部３１ｆに連通する先端孔部３２を形成し、先端孔部３２の下方の空間部３１ｆ内にロードセル４３を設置する。ロードセル４３の上方位置に、上下に延びて上支持部材３５に螺合しナット５１により締結されて作業台１９の荷重に応じた上支持部材３５の撓みをロードセル４３に伝達する撓み伝達部材５２を設ける。
【００４５】
このように撓み伝達部材５２を介して上支持部材３５の撓みをロードセル４３に伝達するように構成することで、荷重検出値の調整が容易になり、作業台荷重検出装置３０の組立精度を低くすることができる。また、中間部材３１を中空状に形成することで、中間部材自体の重量を軽減することができ、且つ中間部材３１の縦剛性を向上させることができる。この縦剛性の向上により中間部材３１の撓み量が減少し、ロードセル４３に作用する撓み量を上支持部材３５の撓み量により近づけることができ、ロードセル４３により検出される作業台荷重の検出精度を高い状態に維持させることができる。また、ロードセル４３は中間部材３１で覆われるので、中間部材３１がロードセル４３を保護する保護カバーとしての機能も兼ねることになり、ロードセル４３の損傷を未然に防止することができる。
【００４６】
ここで、ロードセル４３は、図９に示すように、上支持部材３５の撓みを検出せずに作業台１９に突設されたブラケット５４の撓み（上向き方向の撓み）を検出するようにしてもよい。ブラケット５４は上支持部材３５と中間部材との間に配置されて作業台１９に片持ち支持された状態で設けられ、このブラケット５４の先端部に撓み伝達部材５２が上下方向に螺合し、ナット５１によって撓み伝達部材５２をブラケット５４に締結する。このように構成することで、図８（ａ）に示す作業台荷重検出装置３０と同様の効果を得ることができる。
【００４７】
また、作業台荷重検出装置３０は図８（ｂ）に示すように構成されてもよい。即ち、中間部材３１の先端孔部３２の下方の空間部３１ｆ内に上支持部材３５までの距離を検出する非接触式の距離検出センサ４５を設ける。この非接触式の距離検出センサ４５により検出される上支持部材３５までの距離は作業台荷重と比例関係になるので、検出される上支持部材３５までの距離から作業台荷重を容易に換算することができ、その結果として作業台荷重を検出することができる。また、非接触式の距離検出センサ４５を用いることで、作業台荷重検出装置３０の構造を簡素にすることができる。
【００４８】
【発明の効果】
以上説明したように、本発明における高所作業車の作業台荷重検出装置によれば、垂直ポスト及び作業台間に上下に所定の間隔を有した上支持部材及び下支持部材を平行に配設し、これらの部材間に垂直ポストに接続されて片持ち支持された状態の中間部材を配設し、この中間部材の先端部に作業台荷重検出手段を設けることで、作業台は上支持部材及び下支持部材を介して垂直ポストに支持され、作業台の荷重による上支持部材及び下支持部材に作用するモーメントは上支持部材の引っ張り力及び下支持部材の圧縮力によって略打ち消されて、このモーメントによる上支持部材及び下支持部材への曲げモーメントの影響を小さくすることができる。また、作業台の荷重は上支持部材及び下支持部材の先端部に作用してこれらの部材を下方へ撓ませ、上支持部材の撓みにより上支持部材の下面が作業台荷重検出手段の上端部に押圧当接し、作業台荷重検出手段が作業台の荷重を検出する。このように、作業台荷重検出手段は、曲げモーメントの影響を受けるがその程度を小さくすることができるので、作業台荷重を高い精度で検出することができる。また、作業台荷重検出装置は上支持部材、下支持部材、中間部材及び作業台荷重検出手段から構成されるので、構造が簡素化される。このため、製造コストが安価な作業台荷重検出装置を提供することができる。また、上支持部材の断面係数を下支持部材の縦断面係数よりも大きくした場合において、上支持部材及び下支持部材の材料を同一材料で形成したときには、作業台の荷重のうち上支持部材に作用する荷重を下支持部材に作用する荷重よりも大きくすることができる。その結果として作業台荷重検出手段に作用する荷重の大きさを作業台の荷重に近づけることができ、作業台荷重検出装置の荷重値の検出精度をより向上させることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態における作業台荷重検出装置を搭載した高所作業車の左側面図を示す。
【図２】本発明の一実施の形態における作業台荷重検出装置を示し、同図（ａ）は作業台荷重検出装置の平面図であり、同図（ｂ）は作業台荷重検出装置の側面図である。
【図３】本発明の一実施の形態における上支持部材及び下支持部材の固定方法を説明する図であり、同図（ａ）は作業台荷重検出装置の平面図であり、同図（ｂ）は作業台荷重検出装置の側面図である。
【図４】本発明の一実施の形態における下支持部材の長さを説明するための作業台荷重検出装置の部分側面図である。
【図５】本発明の一実施の形態における作業台荷重検出装置の側面図を示す。
【図６】本発明の一実施の形態における撓み規制部材を有した作業台荷重検出装置の側面図を示す。
【図７】本発明の一実施の形態における上支持部材及び下支持部材の作業台への取り付け方法を説明するための作業台荷重検出装置の平面図である。
【図８】本発明の一実施の形態における作業台荷重検出装置の側面図を示す。
【図９】本発明の一実施の形態における作業台荷重検出装置の側面図を示す。
【図１０】従来技術における作業台荷重検出装置の側面図を示す。
【符号の説明】
１高所作業車
３車体
１１ブーム
１７垂直ポスト
１９作業台
１９ａ側面
３０作業台荷重検出装置
３１中間部材
３１ｃ段部（基部側段部）
３１ｆ空間部
３２先端孔部
３５上支持部材
３９下支持部材
４３ロードセル（作業台荷重検出手段）
４５距離検出センサ（作業台荷重検出手段）
５２撓み伝達部材（撓み伝達手段）
６０撓み規制部材（撓み規制手段）
７０接続部材
７０ａ平面部
７０ｂ面部
Ｕ延伸中心軸線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a platform load detection device for an aerial work platform, and more particularly, to an aerial platform vehicle configured to be able to detect the load of a work platform that is swingably attached to the tip of a boom. The present invention relates to a work bench load detection device.
[0002]
[Prior art]
An aerial work vehicle equipped with such a work bench load detection device is generally constructed based on a track vehicle that can travel, and is constructed by mounting the work device. The work device is mounted on a vehicle and can be swiveled, a boom that can be swung up and down on the swivel, and a telescopically movable boom. Some have a vertical post that is held vertically regardless of the boom undulation angle and a work table that is attached to the vertical post.
[0003]
In such a working device, the tip of the boom and the work table can be calculated so that the load acting on the tip of the boom can be detected from the work table and the overturning direction moment acting on the vehicle body can be calculated via the boom. Is provided with a work table load detecting device for detecting the load on the work table. As shown in FIG. 10, the work table load detecting device 90 is disposed between the vertical post 17 and the work table 19, each having one end connected to the vertical post 17 and extending toward the work table 19, and the other end being connected. It is connected to the side of the work table 19 on the side facing the vertical post 17, and has an upper link member 91 and a lower link member 92 that support the work table 19 by being arranged at a predetermined interval in the vertical direction. A parallel link mechanism 93 configured to be movable up and down while the work table 19 remains parallel to the vertical post 17, an intermediate member 31 having one end connected to the vertical post 17 and extending toward the work table 19, and an intermediate A load cell 43 that is attached to the tip of the member 31 and presses and contacts the lower surface of the connecting member 94 that connects the upper link member 91 of the parallel link mechanism 93 and the work table 19 to detect the load on the work table 19. Possess There are those that are configured.
[0004]
According to such a work table load detecting device 90, the load of the work table 19 is applied to the load cell 43 that detects the tensile force acting on the upper link member 91, the compressive force acting on the lower link member 92, and the load. The work table 19 is supported by the parallel link mechanism in balance with the compressive force in the direction.
[0005]
Here, since the work table 19 is pivotally connected (for example, pin-coupled) to the tip portions of the upper link member 91 and the lower link member 92, the moment acting on the parallel link mechanism 93 from the work table 19 is increased. It does not act as a bending moment on the link member 91 and the lower link member 92. Therefore, the pivot position to the upper link member 91 to which the connection member 94 is pivoted does not move up and down, and the work table 19 swings up and down with the pivot position as the pivot center. The load cell 43 comes into press contact with the lower surface, and the load cell 43 can detect the load of the work table 19 with high accuracy.
[0006]
[Problems to be solved by the invention]
However, the parallel link mechanism is connected via the pivoting mechanism 95 so that both ends of the upper link member and the lower link member can swing up and down with respect to the vertical post and the work table. For this reason, the structure of the parallel link mechanism becomes complicated, and the number of parts increases, resulting in an increase in manufacturing cost.
[0007]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a work table load detection device that can detect a load on a work table with high accuracy and that is inexpensive to manufacture.
[0008]
[Means for Solving the Problems]
  In order to solve the above-described problems, a platform load detection device for an aerial work platform according to the present invention includes a vehicle body, a boom that is attached to the vehicle body so as to be at least movable up and down, and a base that swings up and down at the tip of the boom. Platform load of an aerial work platform comprising a vertical post that is freely mounted and extends upward and is held vertically regardless of the boom undulation angle, and a work platform that is mounted horizontally on the vertical post A detection device, which is arranged between a vertical post and a workbench, and one end of each is a vertical post.United togetherThe other end on the side of the work table facing the vertical post.United togetherAn upper support member and a lower support member, which are arranged in parallel with a predetermined distance above and below to support the work table with respect to the vertical post, and the upper support member and the lower support memberWithin the vertical spacing ofArranged,The base side end isOn a vertical postUnited togetherIntermediate member extended to the workbench side in a cantilevered state and the tip of the intermediate memberContact the lower surface of the upper support member on the upper surface sideDepending on the load of the workbenchThe pressing force from the lower surface of the upper support member that bends downward is detected toWork table load detection means (for example, load cell 43 in the embodiment) to detect, the upper support member and the lower support member,Made from the same material,The section modulus of the upper support member is configured to be larger than the section modulus of the lower support member.
[0009]
  According to the work table load detection device having the above-described configuration, the upper support member and the lower support member having a predetermined vertical distance between the vertical post and the work table are arranged in parallel,theseAn intermediate member connected to a vertical post and supported in a cantilevered manner is disposed between the members, and a work table load detecting means is provided at the tip of the intermediate member, so that the load on the work table is supported by the upper support member and It acts as a bending moment on the tip of the lower support member, bending these members downward, andThe pressing force according to the bendingThe work table load detection means detects the load on the work table. Here, the moment acting on the upper support member and the lower support member due to the load on the work table is substantially canceled by the pulling force of the upper support member and the compression force of the lower support member, and the bending moment acting on the upper support member and the lower support member The influence of is reduced. For this reason, the work table load detecting means can detect the work table load with high accuracy. Further, since the workbench detection device includes the upper support member, the lower support member, the intermediate member, and the workbench load detection means, the structure is simplified. For this reason, it is possible to provide a work bench load detection device that is inexpensive to manufacture. Further, the work table is connected to the vertical post via a top support member and a bottom support member like a ramen structure, and is affected to some extent by the bending moment. Here, since the work table is connected to the respective front ends of the upper support member and the lower support member, the amount of deflection of the upper support member and the lower support member due to the load of the work table becomes the same. Therefore, if the section modulus of the upper support member is larger than the longitudinal section modulus of the lower support member, and the upper support member and the lower support member are made of the same material, the upper support of the work table load The load acting on the member can be made larger than the load acting on the lower support member. As a result, the magnitude of the load acting on the work table load detecting means can be brought close to the load on the work table, and the detection accuracy of the load value of the work table load detecting device can be further improved.
[0010]
  In the work table load detecting device having the above-described configuration, a base side stepped portion protruding upward is formed on the base side of the intermediate member attached to the vertical post, and one end of the upper support member is on the base side stepped portion of the intermediate member.United togetherExtends to the workbench side and the other end of the upper support member is on the side of the workbenchUnited togetherThe length of the lower support member connected between the work table and the vertical post may be longer than the length of the upper support member connected between the base side step of the intermediate member and the side surface of the work table. preferable.
[0011]
According to the work table load detecting apparatus having the above-described configuration, the work table is connected to the vertical post via the upper support member and the lower support member like a rigid frame structure, and is affected to some extent by the bending moment. Moreover, since the front-end | tip part of an upper support member and a lower support member is connected to the work bench | platform, the bending amount of an upper support member and a lower support member becomes the same amount. Here, if the length of the lower support member is changed in a state where the length of the upper support member protruding from the base side end portion is made constant, the longer the lower support member length, the more it acts on the distal end portion of the lower support member. Load to be reduced. Further, when the length of the upper support member protruding from the base side end portion is changed in a state where the length of the lower support member is constant, the lower support member acts on the distal end portion of the upper support member as the length of the upper support member becomes shorter. The load can be increased. As a result, if the length of the lower support member is made as long as possible and the length of the upper support member is made shorter than the length of the lower support member, the load acting on the lower support member can be reduced and the upper support member can be reduced. The load acting on the member can be increased. Therefore, the load from the work table acting on the upper support member can be brought close to the load on the work table, and the detection accuracy of the load value of the work table load detection device can be further improved.
[0012]
  In the work table load detection device having the above configuration, one end of the upper support memberIs attached to the vertical post or workbench by bolts and is detachably integrated, and the other end of the upper support member is fixedly attached to the workbench or vertical post and is on the same side as one end of the upper support member. The end of the lower support member located on the vertical post or workbench is fixedly attached to the vertical post or workbench, and the end of the lower support member located on the same side as the other end of the upper support member is bolted to the workbench or vertical post. It may be configured to be coupled and detachably integrated.
[0013]
According to the work table load detection device having the above configuration, the upper support member is detachably attached to the vertical post or the work table, and the lower support member is detachably attached to the vertical post or the work table. By disposing the positions on the opposite side, the sliding strength of the seating surface of the detachable portion can be increased compared to the case where these end portions are attached to the same side.
[0014]
In the work table load detecting device having the above-described configuration, a bending control means (for example, a bending control member 60 in the embodiment) that controls at least the lower support member from bending upward when an upward force is applied to the work table. It may be provided.
[0015]
According to the work table load detecting device having the above configuration, by providing the bending restricting means, the bend restricting means restricts the bending at least above the lower support member even when an upward force is applied to the work table. For this reason, it is possible to prevent a situation in which stress concentration occurs in the lower support member due to the work table moving upward, and the lower support member is damaged.
[0016]
In the work table load detecting device having the above-described configuration, a connection member that protrudes toward the vertical post side is provided on the side surface of the work table, and a normal extending from the side surface of the work table and a predetermined inclination angle are formed on a surface portion formed at the tip of the connection member. You may make it the front-end | tip part of an upper support member be connected to a surface part so that the extending | stretching center axis line of the upper support member to have may be orthogonally crossed.
[0017]
According to the work table load detection device having the above-described configuration, the upper support member is configured such that the normal extending from the side surface of the work table and the extension center axis of the upper support member extending at a predetermined inclination angle are orthogonal to the surface portion of the connection member. By connecting the front end portion of the upper support member to the surface portion, the torsional torque from the work table acting on the front end portion of the upper support member can be made to act evenly in the width direction of the upper support member around the extending center axis of the upper support member. it can. For this reason, if the contact position of the work table load detecting means that contacts the upper support member is positioned within a vertical plane passing through the vertical direction of the extending central axis, the work table detected by the load cell even if the upper support member is twisted. The load detection accuracy can be maintained at a high level.
[0018]
In the work table load detecting apparatus having the above-described configuration, the intermediate member has a space portion inside and is formed in a box shape, and a tip hole portion that opens upward and communicates with the space portion is formed in the upper portion on the tip end side of the intermediate member. The working table load detecting means (for example, the load cell 43 and the distance detecting sensor 45 in the embodiment) is provided in the space below the tip hole portion, and is attached to the upper support member or the work table and extends vertically to the tip hole portion. And when the upper support member is bent, it has a bending transmission means (for example, the bending transmission member 52 in the embodiment) that moves up and down and transmits the amount of bending of the upper support member to the work bench load detection means. It may be.
[0019]
According to the work table load detecting device having the above configuration, by providing the work table load detecting means inside the tip of the intermediate member formed in a box shape, compared to the case where the intermediate member is configured by a solid thick plate. The weight of the intermediate member itself can be reduced, and the longitudinal rigidity of the intermediate member can be improved. Further, since the amount of bending of the intermediate member is reduced by improving the longitudinal rigidity, the amount of bending of the upper support member and the amount of bending acting on the platform load detecting means can be made closer to the same amount and detected by the platform load detecting device. The detection accuracy of the work table load to be performed can be maintained at a high level. In addition, since the platform load detection means is installed in the space so as to be covered with the intermediate member, the intermediate member also serves as a protective cover for protecting the platform load detection means. Damage to the means can be prevented beforehand.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. The present embodiment shows an aspect of an aerial work vehicle including a work table at the tip of a boom configured to be extendable and retractable.
[0021]
First, before explaining the platform load detection device according to the present invention, an aerial work platform equipped with the platform load detection device will be described. As shown in FIG. 1, the aerial work vehicle 1 is configured with a truck vehicle as a base, and is capable of traveling with wheels 4 disposed at the left and right ends of the front and rear of the vehicle body 3. A cabin 5 is provided, and jacks 7 that lift and support the vehicle body 3 are disposed on the left and right sides of the vehicle body 3 at the front and rear. A swivel base 9 capable of swiveling is attached to the rear part of the vehicle body 3, and the swivel base 9 is configured to be turnable by a turn motor (not shown) built in the car body 3. A boom 11 is attached to the upper part of the swivel base 9. The boom 11 can be raised and lowered by a raising and lowering cylinder 13.
[0022]
The boom 11 is configured such that a base end boom 11a, an intermediate boom 11b, and a front end boom 11c are telescopically combined with each other from the base end side, and can be expanded and contracted. A vertical post 17 is provided at the distal end of the tip boom 11c so that the lower part is pivotably pivoted upward and downward, and the vertical post 17 is a leveling cylinder (not shown) provided between the vertical post 17 and the tip boom 11c. Thus, the boom 11 is held in a vertical state regardless of the undulation angle of the boom 11. A work table load detecting device 30 to be described later is attached to the side surface of the vertical post 17 so as to be capable of horizontal swiveling (swinging motion), and a bottomed container-like work table 19 is attached to the tip of the work table load detecting device 30. It is attached in a horizontal state via a bracket 20. The work table 19 is provided with an operating device 21 that operates to drive the turning, undulation, and expansion / contraction motion of the boom 11, and to operate the drive of the swing motion (swing motion) of the work table 19.
[0023]
Next, a work table load detection device 30 that detects the load of the work table 19 provided in the aerial work platform 1 configured as described above will be described. 2A is a plan view of the work bench load detection device 30, and FIG. 2B is a side view of the work bench load detection device 30. As shown in FIG. 2, the work table load detection device 30 includes an intermediate member 31 that extends in the horizontal direction toward the work table 19 in a state where the right end is fixed to the upper portion of the vertical post 17 and is cantilevered. Arranged above the member 31, is fixed to the side surface 19 a of the work table 19 facing the vertical post 17, extends horizontally to the vertical post 17 side, and the tip is attached to and detached from the upper surface of the base of the intermediate member 31. A freely attached upper support member 35 and a lower side than the intermediate member 31 are fixed to the side surface 17a of the vertical post 17 on the side facing the work table 19 and extend horizontally to the work table side. A lower support member 39 that is detachably attached to the bottom of the work table 19, and a lower surface of the upper support member 35 that is attached to the tip of the intermediate member 31 and whose upper end bends according to the load of the work table 19. Work table 1 in press contact It is configured to include a load cell 43 for detecting the load. In addition, another structure of the work bench | platform load detection apparatus 30 is mentioned later.
[0024]
The intermediate member 31 is a plate-like member having a rectangular longitudinal section and extending horizontally, a base 31a on the side fixed to the vertical post 17, and a tip 31b protruding from the tip of the base 31a toward the work table 19 side. It is comprised. A step portion 31 c that protrudes upward is formed on the upper portion of the base portion 31 a, and the upper surface of the step portion 31 c is formed in a horizontal plane, and the tip end portion of the upper support member 35 is formed on the upper surface via a plurality of bolts 47. Is attached. The plurality of bolts 47 are arranged in a state where they are evenly aligned in the left-right direction with a central axis S extending in the front-rear direction (left-right direction in FIG. 2A) of the intermediate member 31 as a boundary. The size of the bolt 47 will be described later.
[0025]
The base end portion of the upper support member 35 is fixed to the side surface 19a of the work table 19 by welding or the like. The base portion of the lower support member 39 is fixed to the side surface 17 a of the vertical post 17 by welding or the like, and the distal end portion of the lower support member 39 is attached to the bottom portion of the work table 19 via a plurality of bolts 49. The arrangement of the bolts 49 conforms to the bolts 47 that attach the upper support member 35 to the intermediate member 31 and will not be described.
[0026]
As described above, the work table 19 is connected to the vertical post 17 via the upper support member 35 and the lower support member 39 extending in the horizontal direction, and both end portions of the upper support member 35 and the lower support member 39 are rigidly connected. Is in a state. That is, the work table 19 is connected to the vertical post 17 via the upper support member 35 and the lower support member 39 in a so-called ramen structure. For this reason, the load of the work table 19 acts as a bending moment on the tip portions of the upper support member 35 and the lower support member 39 to bend them downward. The moment acting on the support member 39 is substantially canceled by the pulling force of the upper support member 35 and the compression force of the lower support member 39. For this reason, the upper support member 35 and the lower support member 39 are subjected to a bending moment, but the degree thereof is reduced, and the magnitude of the load acting on the load cell 43 can be brought close to the load of the work table 19. The detection accuracy of 30 load values can be improved.
[0027]
Here, the mounting positions of the bolts 47 and 49 described above will be further described with reference to FIG. In FIG. 3, the lower support member 39 is attached to the lower surface of a step portion 31 d formed by protruding downward from the base portion of the intermediate member 31 via a bolt 47, and the base side of the lower support member 39 is attached to the work table 19. An example of fixing is shown. That is, FIG. 3 shows a case where the bolt 47 for attaching the tip of the lower support member 39 and the bolt 47 for attaching the tip of the upper support member 35 are on the same vertical post 17 side. In such a case, an external force E is applied to the side surface 19b of the work table 19 in the direction of turning (swinging) around the vertical post 17 as a swing center, and the upper support member 35 is fastened to the intermediate member 31 by the bolt 47. Assuming that it is tightened with a force F, the maximum value M ′ of the coercive moment acting on the bearing surface of the bolt 47 against the moment M (M = SL) that causes the work table 19 to pivot by the external force E is It is represented by the formula 1. For the convenience of explanation, the coercive moment is considered only for the pitch circle diameter of the plurality of bolts 47 attached to the upper support member 35, and f in FIG.
[0028]
[Expression 1]
M ′ = 2 μFL ′
However, μ indicates a friction coefficient between the seating surfaces of the bolts 47a and 47b and the upper surface of the upper support member 35,
L ′ indicates the pitch circle diameter of the bolt 47 shown in FIG.
[0029]
On the other hand, in the case of FIG. 2, an external force E acts on the side surface 19 b of the work table 19, and the upper support member 35 is tightened to the intermediate member 31 with the tightening force F by the bolt 47 attached to the tip of the upper support member 35. Assuming that, the maximum value M ″ of the coercive force acting on the seat surface of the bolt 47 against the moment M (M = SL) for turning the work table 19 by the external force E is expressed by the following equation (2). For convenience of explanation, one bolt 47a among the plurality of bolts 47 attached to the upper support member 35 is considered.
[0030]
[Expression 2]
M ″ = μFL
However, L shows the distance between the volt | bolt 47a shown in FIG.2 (b), and the volt | bolt 49 which has attached the front-end | tip part of the lower support member 39. FIG.
[0031]
When these formulas 1 and 2 are compared, if the relationship 2L ′ << L, then M ′ << M ″, that is, the tip of the upper support member 35 is positioned on the vertical post 17 side as shown in FIG. The magnitude of the coercive moment M ″ can be increased compared to the case of FIG. 3 by attaching via the bolt 47 and attaching the tip of the lower support member 39 via the bolt 49 on the work table 19 side. it can. For this reason, it is not necessary to increase the diameter of the bolt 47 for attaching the tip of the upper support member 35 shown in FIG.
[0032]
Thus, the upper support member 35 attached to the intermediate member 31 via the bolts 47 and 49 and the lower support member 39 attached to the work table 19 are formed of the same material (for example, a metal material) and are supported by the upper support member 35. The section modulus of the member 35 is configured to be larger than the section modulus of the lower support member 39. Specifically, the upper support member 35 and the lower support member 39 have the same shape in plan view, and the thickness dimension of the upper support member 35 is larger than that of the lower support member 39. Here, as described above, the work table 19 is connected to the vertical post 17 via the upper support member 35 and the lower support member 39 like a ramen structure, and the upper support member 35 is affected to some extent by the bending moment. . However, if the thickness dimension of the upper support member 35 is larger than that of the lower support member 39, the load of the work table 19 acts on the upper support member 35 and the lower support member 39, and the upper support member 35 and the lower support member 39 are supported. When the end portions of the members 39 are bent downward by the same amount of deflection, the magnitude of the load acting on the upper support member 35 can be made larger than the magnitude of the load acting on the lower support member 39.
[0033]
This means that most of the load of the work table 19 acting on the upper support member 35 and the lower support member 39 acts on the upper support member 35. As a result, the load acting on the upper support member 35 can be brought close to the load of the work table 19, and the accuracy of the load value detected by the load cell 43 can be further improved. In the above description, the upper support member 35 and the lower support member 39 are formed of the same material. However, the present invention is not limited to this, and may be formed of different materials. In this case, the material and shape are selected and formed so that the bending rigidity (bending stiffness) of the upper support member 35 is larger than the bending rigidity of the lower support member 39.
[0034]
Next, the lengths of the upper support member 35 and the lower support member 39 will be described. The work table load detection device 30 is configured so that the upper support member 35 is bent by the load of the work table 19, and the upper support member 35 presses and contacts the load cell 43 due to the bending, so that the load cell 43 detects the load of the work table 19. It is configured. However, when the upper support member 35 is bent, the lower support member 39 also has the same amount of bending and is bent downward, so that the detection value detected by the load cell 43 cannot detect the true load of the work table 19. That is, the detection value detected by the load cell 43 is a value obtained by subtracting the pressing force necessary to bend the upper support member 35 and the lower support member 39 downward from the true load of the work table 19. As a result, the detection value detected by the load cell 43 is further away from the true load of the work table 19 and the load detection accuracy is lowered as the pressing force that bends the lower support member 39 downward increases.
[0035]
Therefore, as shown in FIG. 4, the lower support member 39 is required to give the same amount of bending amount δ to each of the lower support members 39 of two types (L2 ′ <L2 ″). Considering the magnitude of the load acting on the member 39, it is considered that the longer support member 39 can obtain the deflection amount δ with a smaller force than the shorter support member 39. As a result, FIG. ), The length of the lower support member 39 is set to the maximum length L2 out of allowable lengths in consideration of the storage posture and the like when the work table 19 shown in FIG. 1 is stored in the vehicle. Has been.
[0036]
On the other hand, as shown in FIG. 2, if the amount of bending of the lower support member 39 is increased as described above, the accuracy of detecting the work table load is lowered, so this amount of bending is desired to be reduced. For this reason, it is necessary to reduce the amount of bending of the upper support member 35. Further, since a large load acts on the upper support member 35, it is desired to increase the area of the portion where the upper support member 35 is fixed with the bolts 47. Therefore, the length L1 of the upper support member 35 is set to a length L1 (L1 <L2) shorter than the length L2 of the lower support member 39. As a result, the magnitude of the load acting on the upper support member 35 can be made closer to the load on the work table 19, and the load detection accuracy of the work table load detection device 30 can be further improved. Further, since the work table load detecting device 30 according to the present invention includes the upper support member 35, the lower support member 39, the intermediate member 31, and the load cell 43, the upper link member 91 and the lower link as shown in FIG. The pivot mechanism 95 that pivots the member 92 is not required, and the number of parts can be reduced to reduce the manufacturing cost.
[0037]
As shown in FIG. 5, when the upper support member 35 is securely fixed to the vertical post 17, the end of the upper support member 35 on the vertical post 17 side is directly fixed to the vertical post 17. . If the end of the lower support member 39 on the work table 19 side is directly fixed to the work table 19, the structure of the work table load detection device 30 is further simplified, and the cost of the work table load detection device 30 is further reduced. be able to.
[0038]
Further, the work table load detecting apparatus according to the present invention is configured so that the upper support member 35 and the lower support member 39 are applied to the work table 19 shown in FIG. Will bend upward. In this case, in particular, in the portion Q fixed to the vertical post 17 of the lower support member 39, the bending moment and the pulling force due to the external force R act to concentrate the stress, and the portion Q may be damaged. Therefore, in order to prevent such damage, the work table load detection device 30 shown in FIG. 6 is provided with a deflection regulating member 60 that regulates the upper support member 35 and the lower support member 39 from bending upward. ing.
[0039]
Specifically, the deflection regulating member 60 shown in FIG. 6A protrudes downward from the lower end of the tip of the intermediate member 31, and the lower portion of the deflection regulating member 60 is formed in contact with the upper surface of the lower support member 39. Yes. Further, the deflection regulating member 60 shown in FIG. 6B is provided on the side surface 19 a of the work table 19 on the side facing the vertical post 17 so as to project toward the vertical post side, and the upper surface of the distal end of the deflection regulating member 60 is the intermediate member 31. It arrange | positions so that it may be in the state which contacted the front-end | tip lower surface. Further, the deflection regulating member 60 shown in FIG. 6C is an upper projecting member among the upper projecting member 63 and the lower projecting member 65 extending in the horizontal direction with a predetermined interval in the vertical direction at the tip of the intermediate member 31. A screw member that is slidable through a through-hole formed in the tip end portion of the member 63 and is fastened and fixed to the upper support member 35, and nuts 67, 68 is screwed together. When the deflection regulating member 60 is rotated, the vertical position is adjusted, and the contact state of the deflection regulating member 60 with the load cell 43 installed on the upper surface on the front end side of the lower protruding member 65 can be adjusted. When the 67 is rotated, the deflection regulating member 60 is fixed to the upper support member 35. Further, when the lower nut 68 is rotated to bring the upper surface of the nut 68 into contact with the lower surface of the upper protruding member 63, an external force R that moves upward acts on the work table 19 shown in FIG. In addition, the nut 68 presses and contacts the bottom surface of the upper projecting member 63 via the upper support member 35, the nut 67, and the deflection regulating member 60, thereby restricting the upward movement of the work table 19, and as a result, the lower support member. The upward bending of 39 and the upper support member 35 is restricted.
[0040]
As shown in FIG. 8A, the bolt 80 is screwed to the distal end portion of the deflection regulating member 60 in a state of extending in the vertical direction, and the bolt 81 is fastened to the deflection regulating member 60 with a nut 81. By doing so, the amount of deflection of the deflection regulating member 60 can be adjusted, and a simple deflection amount adjusting mechanism including the bolt 80 and the nut 81 can be provided.
[0041]
Further, an upper support member 35 and a lower support member 39 (hereinafter collectively referred to as “support members 35 and 39”) of the work table load detection device 30 according to the present invention are as shown in FIG. In addition, there is a case where the extending center axis U in which the support members 35 and 39 extend is not arranged so as to be orthogonal to the side surface 19 a of the work table 19. In such a case, a connecting member 70 is attached to the side surface 19a of the work table 19 so as to project to the side of the vertical post 17 to form a flat planar portion 70a whose tip portion extends vertically, and the extending central axis U is attached to the planar portion 70a. The front ends of the support members 35 and 39 are fixed to the flat portion 70a so as to be orthogonal to each other.
[0042]
Thus, by fixing the tip portions of the support members 35 and 39 to the flat surface portion 70a, the twisting torque from the work table 19 acting on the tip portions of the support members 35 and 39 is supported around the extending central axis U. It can be made to act equally in the width direction of 35, 39 (H direction orthogonal to the stretching center axis U). For this reason, even if the upper support member 35 is twisted if the contact position of the load cell 43 shown in FIG. 2A that contacts the upper support member 35 is positioned within a vertical plane passing through the vertical direction of the extending central axis U. The detection accuracy of the work table load detected by the load cell 43 can be maintained in a high state. In addition, the upper support member 35 may be sufficient as the support member fixed to the plane part 70a.
[0043]
Further, the surface portion 70b of the connecting member 70 for connecting the upper support member 35 and the lower support member 39 is not limited to a plane as shown in FIG. 7B, and may be formed in a spherical shape in plan view. . In this case, the extending center axis U is arranged so as to be orthogonal to the tangent T passing through the intersection point O where it intersects the spherical surface portion 70b, and the upper support member 35 and the lower support member 39 are subject to the left and right with respect to the extending center axis U. Attached to. By configuring in this way, the same effect as that shown in FIG. 7A can be obtained.
[0044]
The work table load detection device 30 described above may be configured as shown in FIG. That is, the intermediate member 31 has a space portion 31f inside and is formed in a hollow shape, and forms a tip hole portion 32 that opens upward and communicates with the space portion 31f at the top of the tip portion of the intermediate member 31. The load cell 43 is installed in the space 31 f below the hole 32. A deflection transmitting member 52 that extends vertically and is screwed into the upper support member 35 and fastened by a nut 51 to transmit the deflection of the upper support member 35 according to the load of the work table 19 to the load cell 43 at a position above the load cell 43. Provide.
[0045]
In this way, the configuration in which the deflection of the upper support member 35 is transmitted to the load cell 43 via the deflection transmission member 52 makes it easy to adjust the load detection value and reduce the assembly accuracy of the worktable load detection device 30. can do. Moreover, by forming the intermediate member 31 in a hollow shape, the weight of the intermediate member itself can be reduced, and the longitudinal rigidity of the intermediate member 31 can be improved. By improving the longitudinal rigidity, the amount of bending of the intermediate member 31 is reduced, and the amount of bending acting on the load cell 43 can be made closer to the amount of bending of the upper support member 35, and the detection accuracy of the work table load detected by the load cell 43 can be increased. It can be kept high. Further, since the load cell 43 is covered with the intermediate member 31, the intermediate member 31 also functions as a protective cover for protecting the load cell 43, and damage to the load cell 43 can be prevented.
[0046]
Here, as shown in FIG. 9, the load cell 43 may detect the bending (upward bending) of the bracket 54 protruding from the work table 19 without detecting the bending of the upper support member 35. Good. The bracket 54 is disposed between the upper support member 35 and the intermediate member and is supported in a cantilever manner on the work table 19, and the bending transmission member 52 is screwed in the vertical direction at the tip of the bracket 54, The bending transmission member 52 is fastened to the bracket 54 by the nut 51. By comprising in this way, the effect similar to the work bench | platform load detection apparatus 30 shown to Fig.8 (a) can be acquired.
[0047]
Further, the work bench load detection device 30 may be configured as shown in FIG. That is, a non-contact type distance detection sensor 45 that detects the distance to the upper support member 35 is provided in the space 31 f below the tip hole portion 32 of the intermediate member 31. Since the distance to the upper support member 35 detected by the non-contact type distance detection sensor 45 is proportional to the work table load, the work table load is easily converted from the detected distance to the upper support member 35. As a result, the work table load can be detected. Further, by using the non-contact type distance detection sensor 45, the structure of the worktable load detection device 30 can be simplified.
[0048]
【The invention's effect】
As described above, according to the work load detecting device for an aerial work platform in the present invention, the upper support member and the lower support member having a predetermined vertical distance between the vertical post and the work table are arranged in parallel. AndtheseAn intermediate member connected to a vertical post and supported in a cantilever manner is disposed between the members, and a work table load detecting means is provided at the tip of the intermediate member, so that the work table is supported by the upper support member and the lower support member. The moment that is supported by the vertical post via the member and acts on the upper support member and the lower support member due to the load of the work table is substantially canceled by the pulling force of the upper support member and the compression force of the lower support member, and The influence of the bending moment on the support member and the lower support member can be reduced. In addition, the load of the work table acts on the tip portions of the upper support member and the lower support member to bend them downward, and the upper support member is bent by the upper support member so that the lower surface of the upper support member is the upper end of the work table load detecting means. The work table load detecting means detects the load on the work table. As described above, the work table load detecting means is affected by the bending moment, but the degree thereof can be reduced, so that the work table load can be detected with high accuracy. Further, since the work table load detecting device is composed of the upper support member, the lower support member, the intermediate member, and the work table load detecting means, the structure is simplified. For this reason, it is possible to provide a work bench load detection device that is inexpensive to manufacture. In addition, when the section modulus of the upper support member is larger than the longitudinal section modulus of the lower support member, when the upper support member and the lower support member are formed of the same material, The acting load can be made larger than the load acting on the lower support member. As a result, the magnitude of the load acting on the work table load detecting means can be brought close to the load on the work table, and the detection accuracy of the load value of the work table load detecting device can be further improved.
[Brief description of the drawings]
FIG. 1 is a left side view of an aerial work vehicle equipped with a workbench load detection device according to an embodiment of the present invention.
2A and 2B show a platform load detection device according to an embodiment of the present invention, in which FIG. 2A is a plan view of the platform load detection device, and FIG. 2B is a side view of the platform load detection device. FIG.
FIG. 3 is a diagram for explaining a method of fixing an upper support member and a lower support member in an embodiment of the present invention, wherein FIG. 3 (a) is a plan view of a work table load detection device, and FIG. ) Is a side view of the work bench load detection device.
FIG. 4 is a partial side view of the work bench load detection device for explaining the length of the lower support member in the embodiment of the present invention.
FIG. 5 is a side view of the work bench load detection device according to the embodiment of the present invention.
FIG. 6 is a side view of a work bench load detection apparatus having a deflection regulating member according to an embodiment of the present invention.
FIG. 7 is a plan view of a work bench load detecting device for explaining a method of attaching the upper support member and the lower support member to the work bench in the embodiment of the present invention.
FIG. 8 is a side view of the work bench load detection device according to the embodiment of the present invention.
FIG. 9 is a side view of the work bench load detection device according to the embodiment of the present invention.
FIG. 10 shows a side view of a work table load detection device in the prior art.
[Explanation of symbols]
1 aerial work vehicle
3 body
11 Boom
17 Vertical post
19 Working table
19a side
30 Platform load detector
31 Intermediate member
31c Step (base side step)
31f space
32 Tip hole
35 Upper support member
39 Lower support member
43 Load cell (Workbench load detection means)
45 Distance detection sensor (workbench load detection means)
52 Deflection transmitting member (deflection transmitting means)
60 Deflection regulating member (deflection regulating means)
70 Connection member
70a Plane section
70b face part
U Stretch center axis

Claims

車体と、
前記車体に少なくとも起伏動自在に取り付けられたブームと、
前記ブームの先端部に基部が上下に揺動自在に取り付けられて上方へ延び、前記ブームの起伏角度に拘わらず垂直に保持される垂直ポストと、
前記垂直ポストに水平状態に取り付けられた作業台とを有してなる高所作業車の作業台荷重検出装置であって、
前記垂直ポスト及び前記作業台間に配設され、それぞれ一端が前記垂直ポストに一体に結合されて前記作業台側へ延び、それぞれ他端が前記作業台の前記垂直ポストに対向する側の側面に一体に結合され、上下に所定の間隔を有して平行に配置されて前記垂直ポストに対して前記作業台を支持する上支持部材及び下支持部材と、
前記上支持部材及び前記下支持部材の上下間隔内に配設され、基部側端部が前記垂直ポストに一体に結合されて片持ち支持された状態で前記作業台側へ延びた中間部材と、
前記中間部材の先端部上面側に前記上支持部材の下面に当接して取り付けられ、前記作業台の荷重に応じて下方向に撓む前記上支持部材の下面からの押圧力を検出して前記作業台の荷重を検出する作業台荷重検出手段とを有し、
前記上支持部材及び前記下支持部材は、同一材料から作られ、前記上支持部材の断面係数が前記下支持部材の断面係数よりも大きくなるように構成されていることを特徴とする高所作業車の作業台荷重検出装置。The car body,
A boom attached to the vehicle body so as to be at least movable up and down;
A vertical post that is attached to the tip of the boom so as to be swingable up and down, extends upward, and is held vertically regardless of the undulation angle of the boom;
A work bench load detection device for an aerial work platform comprising a work bench mounted horizontally on the vertical post,
Disposed between the vertical post and the workbench, each having one end integrally coupled to the vertical post and extending toward the workbench side, and the other end on a side surface of the workbench facing the vertical post. An upper support member and a lower support member that are integrally coupled and arranged in parallel with a predetermined interval in the vertical direction to support the work table with respect to the vertical post;
An intermediate member that is disposed within a vertical interval between the upper support member and the lower support member , and that extends to the workbench side in a state where a base side end is integrally coupled to the vertical post and is cantilevered;
The pressing force from the lower surface of the upper support member attached to the lower surface of the upper support member on the upper surface side of the front end portion of the intermediate member and bent downward according to the load of the work table is detected and A work table load detecting means for detecting a load on the work table;
The aerial work characterized in that the upper support member and the lower support member are made of the same material, and the section modulus of the upper support member is larger than the section modulus of the lower support member. Car platform load detection device.

前記垂直ポストに取り付けられた前記中間部材の基部側に上方へ突出する基部側段部を形成し、
前記上支持部材はその一端が前記中間部材の前記基部側段部上に一体に結合されて前記作業台側へ延び、前記上支持部材の他端が前記作業台の前記側面に一体に結合され、
前記作業台及び前記垂直ポスト間に接続された前記下支持部材の長さは、前記中間部材の前記基部側段部及び前記作業台の側面間に接続された前記上支持部材の長さよりも長いことを特徴とする請求項１に記載の高所作業車の作業台荷重検出装置。Forming a base side stepped portion protruding upward on the base side of the intermediate member attached to the vertical post;
One end of the upper support member is integrally connected to the base side step portion of the intermediate member and extends to the work table side, and the other end of the upper support member is integrally connected to the side surface of the work table. ,
The length of the lower support member connected between the work table and the vertical post is longer than the length of the upper support member connected between the base side step of the intermediate member and the side surface of the work table. The work load detecting apparatus for an aerial work vehicle according to claim 1.

前記上支持部材の一方の端部が前記垂直ポスト又は前記作業台にボルト結合されて着脱可能に一体結合され、前記上支持部材の他方の端部が前記作業台又は前記垂直ポストに固着状態で取り付けられ、
前記上支持部材の一方の端部と同一側に位置する前記下支持部材の端部が前記垂直ポスト又は前記作業台に固着状態で取り付けられ、前記上支持部材の他方の端部と同一側に位置する前記下支持部材の端部が前記作業台又は前記垂直ポストにボルト結合されて着脱可能に一体結合されていることを特徴とする請求項１に記載の高所作業車の作業台荷重検出装置。One end of the upper support member is bolted to the vertical post or the workbench and is detachably integrated , and the other end of the upper support member is fixed to the workbench or the vertical post. Attached,
The end of the lower support member located on the same side as one end of the upper support member is fixedly attached to the vertical post or the work table, and is on the same side as the other end of the upper support member. The platform load detection of an aerial work platform according to claim 1, wherein an end portion of the lower support member positioned is bolted to the platform or the vertical post and is detachably integrated. apparatus.

前記作業台に上方向の力が作用したときに少なくとも前記下支持部材が上方へ撓むのを規制する撓み規制手段を設けたことを特徴とする請求項１から３のいずれかに記載の高所作業車の作業台荷重検出装置。 4. The height according to claim 1, further comprising a deflection regulating unit that regulates at least the lower support member to bend upward when an upward force is applied to the work table. 5. Work platform load detection device for work vehicles.

前記作業台の前記側面に前記垂直ポスト側へ突出する接続部材を設け、前記接続部材の先端に形成された面部に前記作業台の前記側面から延びる法線と所定の傾斜角度を有して延びる前記上支持部材の延伸中心軸線が直交するように少なくとも前記上支持部材の先端部が前記面部に結合されていることを特徴とする請求項１から４のいずれかに記載の高所作業車の作業台荷重検出装置。A connection member that protrudes toward the vertical post is provided on the side surface of the work table, and a surface portion formed at a tip of the connection member extends with a normal extending from the side surface of the work table and a predetermined inclination angle. 5. The aerial work vehicle according to claim 1, wherein at least a front end portion of the upper support member is coupled to the surface portion so that an extension center axis of the upper support member is orthogonal to the upper support member. Platform load detector.

前記中間部材は内部に空間部を有して箱状に形成され、前記中間部材の先端側上部に上方へ開口して前記空間部に連通する先端孔部を形成し、前記先端孔部よりも下方の前記空間部内に前記作業台荷重検出手段を設け、
前記上支持部材又は前記作業台に取り付けられて上下に延びて前記先端孔部を挿通し、前記上支持部材が撓むと上下に移動して前記上支持部材の撓み量を前記作業台荷重検出手段に伝達する撓み伝達手段を有してなることを特徴とする請求項１から５のいずれかに記載の高所作業車の作業台荷重検出装置。The intermediate member is formed in a box shape having a space inside, and forms a tip hole portion that opens upward and communicates with the space portion at an upper end on the tip side of the intermediate member. The work table load detection means is provided in the space portion below,
Attached to the upper support member or the work table and extending vertically to pass through the tip hole, and when the upper support member is bent, the upper support member moves up and down to determine the amount of bending of the upper support member. 6. A platform load detection device for an aerial work vehicle according to claim 1, further comprising a bending transmission means for transmitting to the aerial work platform.