JP2000281284A - Overload preventing device for crane - Google Patents
Overload preventing device for craneInfo
- Publication number
- JP2000281284A JP2000281284A JP8704899A JP8704899A JP2000281284A JP 2000281284 A JP2000281284 A JP 2000281284A JP 8704899 A JP8704899 A JP 8704899A JP 8704899 A JP8704899 A JP 8704899A JP 2000281284 A JP2000281284 A JP 2000281284A
- Authority
- JP
- Japan
- Prior art keywords
- load
- crane
- undulation
- boom
- lower limit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，クレーンの過負荷
防止装置に係り，詳しくは，クレーン本体に起伏可能に
取り付けられた起伏部材に作用する実荷重が設定荷重を
越える過負荷状態を防止するために，上記起伏部材の起
伏量が所定の下限値を上回る範囲で，上記起伏部材の起
伏量に応じて上記設定荷重が設定されるクレーンの過負
荷防止装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing overload of a crane, and more particularly, to an overload state in which an actual load acting on an undulating member mounted on a crane body so as to be able to undulate exceeds a set load. Therefore, the present invention relates to a crane overload prevention device in which the set load is set according to the amount of undulation of the undulating member in a range where the amount of undulation of the undulating member exceeds a predetermined lower limit.
【０００２】[0002]
【従来の技術】クレーンでは，本体に起伏可能に取り付
けられたブームやジブなどの起伏部材に掛けられた吊荷
ロープに荷物が吊り下げられるため，同じ荷物が吊り下
げられていたとしても，上記起伏部材が起伏駆動され上
記起伏部材の起伏角度が変化することによって，本体が
荷物を支えきれなくなって転倒したり，機械が破損した
りする恐れがある。上記のような転倒や機械の破損を防
止するために，上記起伏部材の起伏角度θは，所定の作
動許容範囲（上限値θmax ，下限値θmin ）内に制限さ
れることが多い。この作動許容範囲内では，上記起伏部
材の起伏角度θ（あるいは，これから演算される作業半
径Ｒ）に応じて吊持し得る最大の限界荷重Ｗa が，例え
ば図５に示す如く，クレーンの機械的強度及び転倒安定
度に基づいて定められる。図５に示す限界荷重Ｗa の場
合，上記作動許容範囲の下限値θmin から上記作動許容
範囲の上限値θmax 付近までは，上記起伏部材の起伏角
度θと上記起伏部材に作用する荷重Ｗとの積がほぼ一定
となるように上記限界荷重Ｗa が設定されており，上記
作動許容範囲の上限値θmax 付近では，上記起伏部材の
起伏角度θに対して上記限界荷重Ｗa がほぼ一定に設定
されている。上記クレーンでは，上記のような限界荷重
Ｗa よりも，吊荷作業時における吊荷の実荷重が大きい
過負荷状態を判別して，クレーンの運転者等に警告を与
えたり，クレーンの作動を強制的に停止させる過負荷防
止装置を搭載することが義務づけられている。このよう
なクレーンの過負荷防止装置に関する技術は，例えば特
公平３−２７４８０号公報に記載されている。上記起伏
部材の作動許容範囲を定める上記起伏角度の下限値θmi
n は，フック巻上ロープの損傷を防止するために，例え
ばフック巻上ロープとブーム背面のガイドローラとが接
触する起伏角度３０°付近に設定されるのが一般的であ
る。上記クレーンでは，上記過負荷状態の他，上記起伏
部材の起伏角度θが上記下限θmin （〜３０°）に達し
た場合に，荷物が吊り下げられているか否かにかかわら
ず，上記起伏部材の起伏駆動が上記過負荷防止装置によ
り自動的にあるいは強制的に停止させられる。従って，
上記起伏部材を上記下限値θmin 以下の起伏角度まで降
下させる場合には，上記過負荷防止装置による上記起伏
部材の自動停止機能を解除する必要がある。上記過負荷
防止装置による上記起伏部材の自動停止機能の解除は，
例えば上記起伏部材が上記下限値θmin まで降下して上
記過負荷防止装置により上記起伏部材の起伏駆動が一旦
停止させられた後，上記機能を解除させる解除ボタン
を，図５に示す如く運転手が一定起伏角度θd 分だけ押
圧操作しながら，上記自動停止機能が動作しない未作動
領域まで上記起伏部材を降下させることにより行われ
る。2. Description of the Related Art In a crane, since the load is hung on a lifting rope hung on an up-and-down member such as a boom or a jib mounted on the main body so as to be able to be raised and lowered, even if the same load is hung, When the undulation member is driven up and down to change the undulation angle of the undulation member, the main body may not be able to support the load and may fall down or the machine may be damaged. In order to prevent the above-mentioned overturn and damage to the machine, the undulation angle θ of the undulation member is often limited to a predetermined allowable operation range (upper limit θmax, lower limit θmin). Within this allowable operating range, the relief angle of the relief member theta (or working radius R is now operational) maximum limit load W a which may be suspended in response to, for example, as shown in FIG. 5, the crane machine It is determined based on the target strength and the fall stability. For critical load W a shown in FIG. 5, from the lower limit value θmin of the allowable operating range to the vicinity of the upper limit value θmax of the allowable operating range of the load W acting on the derricking angle θ and the relief member of the relief member product has been set the limit load W a to be substantially constant, in the vicinity of the upper limit value θmax of the allowable operating range, set to a constant the critical load W a substantially against derricking angle θ of the undulations member Have been. In the above crane, than limit load W a as described above, to determine the overload condition actual load of the suspended load is large at the time of suspended load work, or give a warning to the driver or the like of the crane, the operation of the crane It is mandatory to install an overload prevention device that forcibly stops. The technology relating to such a crane overload prevention device is described in, for example, Japanese Patent Publication No. 3-27480. The lower limit value θmi of the undulation angle that determines the allowable operating range of the undulation member
In order to prevent damage to the hook hoisting rope, n is generally set to, for example, around an undulating angle of 30 ° at which the hook hoisting rope contacts the guide roller on the back of the boom. In the crane, in addition to the overload state, when the undulation angle θ of the undulating member reaches the lower limit θmin (up to 30 °), regardless of whether the load is suspended or not, The undulating drive is automatically or forcibly stopped by the overload prevention device. Therefore,
When the undulation member is lowered to the undulation angle equal to or less than the lower limit value θmin, it is necessary to cancel the automatic stop function of the undulation member by the overload prevention device. Release of the automatic stop function of the undulating member by the overload prevention device
For example, after the undulating member has been lowered to the lower limit value θmin and the undulating member has been temporarily stopped by the overload prevention device, the driver presses a release button for releasing the function, as shown in FIG. while only pressing a predetermined derricking angle theta d min, it is performed by lowering the undulations member to the unactuated region where the auto-stop function does not work.
【０００３】[0003]
【発明が解決しようとする課題】上記のような解除操作
により，上記起伏部材を上記下限値θmin 以下の角度ま
で降下させることが可能であるが，上記起伏部材が比較
的短く荷物も吊り下げられていない場合，機械的強度及
び転倒安定度の面で，上記解除操作は本来不要なもので
ある。上記解除操作は，上記起伏部材を降下させる操作
と同時に行われることになるため，本来不要であるにも
かかわらず，上記起伏部材を降下させる操作に対する運
転手の注意力を散漫にする恐れがある。また，上記起伏
部材を上記下限値θmin 以下の起伏角度まで降下させる
ために，解除ボタンの操作を日常的に行っていると，上
記解除ボタンに対する操作が習慣化してしまい，荷物が
吊り下げられており，本来的に過負荷状態を防止するこ
とが必要な場合でも，運転手が誤って解除ボタンを押し
てしまう恐れがある。このように，上記起伏部材を上記
下限値θmin 以下の起伏角度まで降下させる従来の手法
では，操作性の面でも，安全性の面でも問題がある。本
発明は，このような従来の技術における課題を解決する
ために，クレーンの過負荷防止装置を改良し，クレーン
本体に起伏可能に取り付けられた起伏部材に作用する実
荷重が設定荷重を越える過負荷状態を防止するために，
上記起伏部材の起伏量が所定の下限値を上回る範囲で，
上記起伏部材の起伏量に応じて上記設定荷重を設定する
だけでなく，上記起伏部材の起伏量が上記所定の下限値
以下の範囲でも，上記起伏部材の起伏量が所定の下限値
を上回る範囲での最小値よりも小さい値にて上記設定荷
重を設定することにより，起伏部材が比較的短く荷物が
吊り下げられていない場合には，上記解除操作等を行う
必要なく，上記起伏部材を上記所定の下限値以下の起伏
量まで降下させることのできるクレーンの過負荷防止装
置を提供することを目的とするものである。By the above-described releasing operation, it is possible to lower the undulating member to an angle equal to or less than the lower limit value θmin. However, the undulating member is relatively short, and the load can be hung. Otherwise, the above-mentioned release operation is essentially unnecessary in terms of mechanical strength and fall stability. Since the release operation is performed simultaneously with the operation of lowering the undulating member, there is a possibility that the driver's attention to the operation of lowering the undulating member may be distracted even though the operation is originally unnecessary. . Also, if the release button is operated on a daily basis in order to lower the undulating member to the undulation angle equal to or less than the lower limit value θmin, the operation of the release button becomes habitual, and the luggage is hung. Therefore, even when it is necessary to prevent the overload state, the driver may accidentally press the release button. As described above, the conventional method of lowering the undulating member to the undulating angle equal to or less than the lower limit value θmin has problems in operability and safety. In order to solve such problems in the prior art, the present invention has improved an overload prevention device for a crane, and an actual load acting on an up-and-down member mounted on a crane body so as to be able to undulate exceeds a set load. To prevent load conditions
When the amount of undulation of the undulating member exceeds a predetermined lower limit,
In addition to setting the set load according to the amount of undulation of the undulating member, the range in which the amount of undulation of the undulating member exceeds the predetermined lower limit even when the amount of undulation of the undulating member is below the predetermined lower limit. By setting the set load at a value smaller than the minimum value in the above, if the luggage member is relatively short and the load is not hung, it is not necessary to perform the release operation, etc. It is an object of the present invention to provide a crane overload prevention device capable of lowering the amount of undulation below a predetermined lower limit.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に，請求項１に係る発明は，クレーン本体に起伏可能に
取り付けられた起伏部材に作用する実荷重が設定荷重を
越える過負荷状態を防止するために，上記起伏部材の起
伏量が所定の下限値を上回る範囲で，上記起伏部材の起
伏量に応じて上記設定荷重が設定されるクレーンの過負
荷防止装置において，上記設定荷重が，上記起伏部材の
起伏量が上記所定の下限値以下の範囲でも設定されてお
り，かつ，上記起伏部材の起伏量が上記所定の下限値を
上回る範囲での上記設定荷重の最小値よりも小さくなる
ように設定されてなることを特徴とするクレーンの過負
荷防止装置として構成されている。In order to achieve the above object, the invention according to claim 1 is directed to an overload state in which an actual load acting on an undulating member mounted on a crane body so as to be able to undulate exceeds a set load. In order to prevent this, in a crane overload prevention device in which the set load is set according to the amount of undulation of the undulating member within a range where the amount of undulation of the undulating member exceeds a predetermined lower limit, the set load is The amount of undulation of the undulating member is also set in a range below the predetermined lower limit, and the undulation of the undulating member is smaller than the minimum value of the set load in a range in which the amount of undulation exceeds the predetermined lower limit. It is configured as a crane overload prevention device characterized by being set as described above.
【０００５】また，請求項２に係る発明は，上記請求項
１に記載のクレーンの過負荷防止装置において，上記起
伏部材が起伏駆動されている間に，上記実荷重が上記設
定荷重を越えた過負荷状態が判別されると，上記起伏部
材の駆動を自動的に停止してなることをその要旨とす
る。According to a second aspect of the present invention, in the crane overload prevention device according to the first aspect, the actual load exceeds the set load while the undulating member is driven up and down. The gist is that when the overload state is determined, the driving of the undulating member is automatically stopped.
【０００６】また，請求項３に係る発明は，上記請求項
２に記載のクレーンの過負荷防止装置において，上記起
伏部材を起伏駆動するために用いる起伏ロープを停止さ
せてなることをその要旨とする。According to a third aspect of the present invention, in the crane overload prevention device according to the second aspect, an up-and-down rope used for driving the up-and-down member to move up and down is stopped. I do.
【０００７】また，請求項４に係る発明は，上記請求項
１〜３のいずれか１項に記載のクレーンの過負荷防止装
置において，上記設定荷重が，上記起伏部材の起伏量が
上記所定の下限値以下の範囲で，上記起伏部材から吊下
ロープを介して荷物を吊り下げるための吊下手段による
荷重に基づいて設定されてなることをその要旨とする。According to a fourth aspect of the present invention, in the crane overload prevention device according to any one of the first to third aspects, the set load is the predetermined amount and the undulation amount of the undulating member is the predetermined amount. The gist is that the setting is made based on the load by the suspending means for suspending the luggage from the undulating member via the suspending rope within the range of the lower limit or less.
【０００８】また，請求項５に係る発明は，上記請求項
１〜４のいずれか１項に記載のクレーンの過負荷防止装
置において，上記起伏量が，上記起伏部材の起伏角度，
又は上記起伏部材の起伏角度から演算される上記起伏部
材の作業半径であることをその要旨とする。According to a fifth aspect of the present invention, in the crane overload prevention device according to any one of the first to fourth aspects, the amount of undulation is defined by the undulation angle of the undulation member,
Alternatively, the gist is a working radius of the undulating member calculated from the undulating angle of the undulating member.
【０００９】上記請求項１〜５のいずれか１項に記載の
クレーンの過負荷防止装置によれば，クレーン本体に起
伏可能に取り付けられた起伏部材に作用する実荷重が設
定荷重を越える過負荷状態を防止するために，上記設定
荷重が，上記起伏部材の起伏量が所定の下限値を上回る
範囲で，上記起伏部材の起伏量に応じて設定されるだけ
でなく，上記起伏部材の起伏量が上記所定の下限値以下
の範囲でも，上記起伏部材の起伏量が所定の下限値を上
回る範囲での最小値よりも小さい値にて設定されるた
め，起伏部材が比較的短く荷物が吊り下げられていない
場合に，本来必要でない上記解除操作等を行う必要な
く，上記起伏部材を上記所定の下限値以下の起伏量まで
降下させることができ，その結果，クレーンの操作性と
安全性を向上させることができる。According to the apparatus for preventing overload of a crane according to any one of claims 1 to 5, the overload that exceeds the set load when the actual load acting on the undulating member mounted on the crane body so as to be able to undulate is set. In order to prevent the state, the set load is set not only in accordance with the amount of undulation of the undulating member but also in the range where the amount of undulation of the undulating member exceeds a predetermined lower limit value. Is set to a value smaller than the minimum value in the range in which the undulating member is above the predetermined lower limit even in the range below the predetermined lower limit, the undulating member is relatively short and the load is hung. If it is not, the undulating member can be lowered to the undulation below the predetermined lower limit without the need to perform the above-mentioned release operation, etc., which is not necessary, thereby improving the operability and safety of the crane. Let it be Can.
【００１０】また，上記請求項２に記載のクレーンの過
負荷装置のように，上記起伏部材が起伏駆動されている
間に，上記実荷重が上記設定荷重を越えた過負荷状態が
判別されると，上記起伏部材の駆動を自動的に停止させ
るようにすれば，荷物が吊り下げられているにもかかわ
らず，誤って運転手が上記起伏部材を上記所定の下限値
以下の角度まで降下させようとしても，上記起伏部材の
起伏駆動を直ちに停止させることができる。According to another aspect of the present invention, an overload state in which the actual load exceeds the set load is determined while the undulating member is being driven up and down. If the driving of the undulating member is automatically stopped, the driver may erroneously lower the undulating member to an angle equal to or less than the predetermined lower limit even though the load is suspended. In this case, the up / down driving of the up / down member can be immediately stopped.
【００１１】ここで，上記起伏部材の駆動の停止は，例
えば上記請求項３に記載のクレーンの過負荷防止装置の
ように，上記起伏部材を起伏駆動するために用いる起伏
ロープを停止させることにより行うことができる。Here, the drive of the undulating member is stopped by stopping an undulating rope used for undulating the undulating member as in the overload protection device for a crane according to the third aspect of the present invention. It can be carried out.
【００１２】また，上記設定荷重は，例えば上記請求項
４に記載のクレーンの過負荷防止装置のように，上記起
伏部材の起伏量が上記所定の下限値以下の範囲で，上記
起伏部材から吊下ロープを介して荷物を吊り下げるため
の吊下手段による荷重に基づいて設定されるものであ
る。The set load may be, for example, a crane overload prevention device according to the fourth aspect, in which the amount of undulation of the undulating member is less than or equal to the predetermined lower limit value. It is set based on the load by the suspending means for suspending the luggage via the lower rope.
【００１３】また，上記起伏量は，具体的には上記請求
項５に記載のクレーン過負荷防止装置のように，上記起
伏部材の起伏角度，又は上記起伏部材の起伏角度から演
算される上記起伏部材の作業半径である。The undulation amount is calculated from the undulation angle of the undulation member or the undulation angle of the undulation member, as in the crane overload prevention device according to the fifth aspect. This is the working radius of the member.
【００１４】[0014]
【発明の実施の形態】以下，添付図面を参照して，本発
明の実施の形態につき説明し，本発明の理解に供する。
尚，以下の実施の形態は，本発明の具体的な一例あっ
て，本発明の技術的範囲を限定する性格のものではな
い。ここに，図１は本発明の一実施の形態に係るクレー
ンの過負荷防止装置の概略構成を示す図，図２は上記過
負荷防止装置が搭載されるクレーンの概略構成例を説明
するための図，図３は上記クレーンの過負荷防止装置の
動作を説明するためのフローチャート，図４は上記クレ
ーンの過負荷防止装置における起伏部材の起伏角度と限
界荷重との対応関係を説明するための図である。図１及
び図２に示す如く，本発明の一実施の形態に係るクレー
ンの過負荷防止装置は，ブーム（起伏部材の一例）３の
起伏角度θを検出するブーム角検出器５と，上記ブーム
３に連結されたガイケーブル６Ｃの張力Ｆを検出する張
力検出器１２と，上記ブーム角検出器５により検出され
た上記ブーム３の起伏角度θに基づいて，上記ブーム３
の作業半径を演算する作業半径演算器１３１，上記作業
半径演算器１３１により演算された上記ブーム３の作業
半径Ｒに基づいて，ブーム３の起伏角度θに応じて吊持
し得る最大の限界荷重（設定荷重）Ｗa を演算する限界
荷重演算器１３２，上記張力検出器１２により検出され
た上記ブーム３に連結されたガイケーブル６Ｃの張力Ｆ
に基づいて上記ブーム３に作用する吊り荷重（実荷重）
Ｗを演算する吊り荷重演算器１３３，上記限界荷重演算
器１３２により演算された上記限界荷重Ｗa ，及び上記
吊り荷重演算器１３３により演算された上記吊り荷重Ｗ
に基づいて，両者の比Ｗ／Ｗa である負荷率を演算する
負荷率演算器１３４を含む過負荷防止部１３と，上記過
負荷防止部１３から出力された負荷率に基づいて，警報
を発するとともに上記ブーム３の起伏駆動を自動停止さ
せる警報・作動自動停止装置１４とを具備する。本実施
の形態に係るクレーンの過負荷防止装置が具備する構成
は，従来装置と同様であるが，上記限界荷重演算器１３
２において用いられる上記限界荷重Ｗaの設定が，従来
装置では，図５に示したような上記上限値θmax と下限
値θminとの間でのみ行われているのに対し，本実施の
形態に係るクレーンの過負荷防止装置では，図４に示す
如く，上記下限値θmin 以下でも上記限界荷重Ｗa が設
定されており，かつ上記起伏角度θが下限値θmin を上
回る範囲での最小限界荷重Ｗmin よりも小さい値に設定
される点で相違する。Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention. FIG. 1 is a view showing a schematic configuration of a crane overload prevention device according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining a schematic configuration example of a crane on which the above-mentioned overload prevention device is mounted. FIGS. 3 and 4 are flowcharts for explaining the operation of the crane overload prevention device, and FIG. 4 is a diagram for explaining the correspondence between the undulation angle of the undulating member and the limit load in the crane overload prevention device. It is. As shown in FIGS. 1 and 2, an overload prevention device for a crane according to an embodiment of the present invention includes a boom angle detector 5 for detecting an elevation angle θ of a boom (an example of an elevation member) 3, 3 based on a tension detector 12 for detecting a tension F of a guy cable 6C connected to the boom 3 and an elevation angle θ of the boom 3 detected by the boom angle detector 5.
A working radius calculator 131 for calculating the working radius of the boom 3, based on the working radius R of the boom 3 calculated by the working radius calculator 131, and the maximum limit load that can be suspended in accordance with the elevation angle θ of the boom 3. (set load) W load limit calculator 132 for calculating the a, tension F Guy cables 6C which is connected to the boom 3 detected by the tension detector 12
Load (actual load) acting on the boom 3 based on the
Suspension load calculator 133 calculates the W, the limit load above limit load calculated by the calculator 132 W a, and the suspension load W calculated by the suspension load calculator 133
And an overload prevention unit 13 including a load ratio calculator 134 for calculating a load ratio that is a ratio W / Wa of the two, and an alarm based on the load ratio output from the overload prevention unit 13. An alarm / operation automatic stop device 14 that emits and automatically stops the up / down driving of the boom 3 is provided. The configuration of the crane overload prevention device according to the present embodiment is the same as that of the conventional device.
Setting of the limit load W a to be used in 2, in the conventional apparatus, while being conducted only between the upper limit value θmax and the lower limit value θmin as shown in FIG. 5, the present embodiment according overload preventing apparatus for a crane, as shown in FIG. 4, the minimum limit load Wmin in the range are the lower limit θmin the critical load W a even less setting, and that the relief angle θ is larger than the lower limit value θmin The difference is that the value is set to a smaller value.
【００１５】以下，本実施の形態に係るクレーンの過負
荷防止装置の詳細について説明する。まず，上記ブーム
角検出器５，張力検出器１２，過負荷防止部１３，警報
・作動自動停止装置１４を備える過負荷防止装置が搭載
されるクレーン１本体には，ブームピン２を中心として
ブーム３が起伏可能に取り付けられており，荷吊り用の
ウインチドラム４Ａ，及びブーム起伏用のウインチドラ
ム４Ｂが設けられている。上記ウインチドラム４Ａから
引き出されたロープ（吊荷ロープ）６Ａは，ブームヘッ
ド（ブーム先端）のシーブ７に掛けられており，このロ
ープ６Ａによってフックブロック８（吊下手段の一例）
が吊り下げられている。上記ウインチドラム４Ｂから引
き出されたロープ（起伏ロープ）６Ｂは，一対の動滑車
９Ａ，９Ｂ間に巻かれており，一方の動滑車９Ａがピン
１１を介して回動可能にクレーン１本体側の支持部材１
ａに連結され，他方の動滑車６Ｂがガイケーブル６Ｃを
介してブームヘッドに連結されている。即ち，上記ウイ
ンチドラム４Ａの回転駆動によりフックブロック８が昇
降させられ，上記ウインチドラム４Ｂの回転駆動により
ブーム３が起伏させられる。尚，ウインチドラムの巻上
制御装置の油圧回路構成は，周知のものと同様のものを
採用することができ，例えば特開平７−４１２８７号公
報などを参照されたい。そして，上記過負荷防止装置の
ブーム角検出器５は，上記ブーム３の基部に設けられ，
上記過負荷防止装置の張力検出器１２は，動滑車９Ａと
クレーン１本体側の支持部材１ａの間に設けられる。ま
た，上記過負荷防止部１３，及び警報・作動停止装置１
４は，クレーン１本体の運転室内に設置され，上記ブー
ム角検出器５及び上記張力検出器１２と電気的に接続さ
れている。Hereinafter, the crane overload prevention device according to the present embodiment will be described in detail. First, the crane 1 main body on which the overload prevention device including the boom angle detector 5, the tension detector 12, the overload prevention unit 13, and the alarm / operation automatic stop device 14 is mounted has a boom pin 2 and a boom 3 as a center. Are mounted so as to be able to be raised and lowered, and a winch drum 4A for hanging a load and a winch drum 4B for raising and lowering a boom are provided. A rope (suspension rope) 6A pulled out from the winch drum 4A is hung on a sheave 7 of a boom head (boom tip), and the rope 6A causes a hook block 8 (an example of suspension means).
Is suspended. A rope (up-and-down rope) 6B pulled out from the winch drum 4B is wound between a pair of moving pulleys 9A and 9B. One of the moving pulleys 9A is rotatable via a pin 11 on the crane 1 body side. Support member 1
a, and the other moving pulley 6B is connected to the boom head via a guy cable 6C. That is, the hook block 8 is raised and lowered by the rotation of the winch drum 4A, and the boom 3 is raised and lowered by the rotation of the winch drum 4B. The hydraulic circuit configuration of the winch drum hoisting control device may be the same as that of a well-known hydraulic circuit. For example, see JP-A-7-41287. And the boom angle detector 5 of the overload prevention device is provided at the base of the boom 3,
The tension detector 12 of the overload prevention device is provided between the moving pulley 9A and the support member 1a on the crane 1 body side. In addition, the overload prevention unit 13 and the alarm / operation stop device 1
4 is installed in the cab of the main body of the crane 1 and is electrically connected to the boom angle detector 5 and the tension detector 12.
【００１６】次に，図３のフローチャートを参照して，
上記クレーンの過負荷防止装置の動作について説明す
る。はじめに，ブーム角検出器５から検出信号が上記過
負荷防止部１３に読み込まれ（Ｓ１０１），上記ブーム
３の起伏角度θが所定の下限値θmin を上回る範囲にあ
るか，上記下限値θmin 以下の範囲であるかの判別が行
われる（Ｓ１０２）。上記工程Ｓ１０２において，上記
ブーム３の起伏角度θが上記下限値θmin を上回る範囲
にあるとの判別が行われた場合，上記過負荷防止部１３
の作業半径演算器１３１により上記ブーム３のそのとき
の作業半径Ｒが，上記ブーム３の起伏角度θ及び上記ブ
ーム３の長さに基づいて演算され，さらに上記過負荷防
止部１３の限界荷重演算器１３２により上記作業半径Ｒ
に基づいて限界荷重Ｗa が演算される（Ｓ１０３）。Next, referring to the flowchart of FIG.
The operation of the crane overload prevention device will be described. First, a detection signal is read from the boom angle detector 5 to the overload prevention unit 13 (S101), and the undulation angle θ of the boom 3 is in a range exceeding a predetermined lower limit value θmin or is equal to or smaller than the lower limit value θmin. It is determined whether it is within the range (S102). In the step S102, when it is determined that the undulation angle θ of the boom 3 is in a range exceeding the lower limit value θmin, the overload prevention unit 13
The working radius R of the boom 3 at that time is calculated by the working radius calculator 131 based on the undulation angle θ of the boom 3 and the length of the boom 3, and the limit load calculation of the overload prevention unit 13 is performed. The working radius R is determined by the
Critical load W a is calculated based on (S103).
【００１７】上記限界荷重演算器１３２では，例えば図
４に示すような上記ブーム３の作業半径Ｒ（あるいは起
伏角度θ）と，限界荷重Ｗa との対応関係が予め保持さ
れており，上記作業半径Ｒが上記作業演算器１３１から
上記限界荷重演算器１３２に供給されると，上記限界荷
重演算器１３２により上記対応関係が参照され，上記限
界荷重Ｗa が演算される。尚，上記限界荷重Ｗa は，ブ
ーム３の起伏角度θに応じて吊持し得る最大の荷重をい
うが，これは本発明における設定荷重の一例であって，
例えば上記限界荷重Ｗa の代わりに，安全率を考慮して
多少上記限界荷重Ｗa より小さな値に設定された定格総
荷重Ｗ0 を用いるようにしてもよい。上記図４に示す対
応関係では，上記ブーム３の作動許容範囲の上限値Ｒma
x （θmax ）と下限値Ｒmin （θmin ）との間では，上
記定格総荷重Ｗ0 が用いられている。また，この上限値
Ｒmax と下限値Ｒmin との間では，従来装置と同様，上
記作業半径Ｒと荷重Ｗとの積がほぼ一定となるように上
記定格総荷重Ｗ0 が設定されている。この場合，上記下
限値Ｒmin において上記定格総荷重Ｗ0 は最小となり，
そのときの値はＷmin である。[0017] In the limit load calculator 132, for example, the operating radius R of the boom 3, as shown in FIG. 4 (or derricking angle theta), correspondence between the critical load W a are held in advance, the work When the radius R is supplied to the critical load calculator 132 from the working calculator 131, the corresponding relationship is referred by the limit load calculator 132, the critical load W a is calculated. Incidentally, the critical load W a refers to the maximum load that can be suspended in accordance with the derricking angle of the boom 3 theta, which is an example of a set load of the present invention,
For example, instead of the limit load W a, it may be used rated load W 0 which is set slightly smaller than the critical load W a in consideration of the safety factor. In the correspondence shown in FIG. 4, the upper limit value Rma of the allowable operation range of the boom 3 is set.
Between x (θmax) and the lower limit value Rmin (θmin), the above-mentioned rated total load W 0 is used. Further, in this between the upper limit value Rmax and the lower limit value Rmin, as in the conventional device, the rated load W 0 so that the product is substantially constant between the working radius R and the load W is set. In this case, the rated total load W 0 becomes minimum at the lower limit value Rmin,
The value at that time is Wmin.
【００１８】上記のようにして限界荷重Ｗa （或いは定
格総荷重Ｗ0 ）が演算されると，次に上記張力検出器１
２により検出された上記ガイケーブル６Ｃの張力検出信
号が上記過負荷状態部１３読み出され，読み出された上
記張力検出信号に基づいて上記吊り荷重演算器１３３に
より上記ブーム３に作用する吊り荷重Ｗが演算される
（Ｓ１０４）。次に，上記工程Ｓ１０３において演算さ
れた上記限界荷重Ｗa と，上記工程Ｓ１０４において演
算された上記吊り荷重Ｗとが，上記限界荷重演算器１３
２，上記吊り荷重演算器１３３から上記負荷率演算器１
３４にそれぞれ供給され，両者の比Ｗ／Ｗa である負荷
率が上記負荷率演算器１３４により演算される（Ｓ１０
５）。そして，上記負荷率演算器１３４により上記負荷
率が演算されると，上記過負荷防止部１３において，上
記負荷率が９０％以下であるか，９０％〜１００％の範
囲にあるか，１００％以上であるかの判別が行われる
（Ｓ１０６）。上記工程Ｓ１０６において，上記負荷率
が９０％以下であるとの判別が行われた場合，上記限界
荷重Ｗa より上記吊り荷重Ｗが１割以上小さいことを意
味するから，転倒や機械の破損等の恐れがなく，特に過
負荷防止に関する処理を行うことなく上記工程Ｓ１０１
に処理が戻される。また，上記工程Ｓ１０６において，
上記負荷率が９０％〜１００％の範囲にあるとの判別が
上記過負荷防止部１３によりされた場合，上記吊り荷重
Ｗが上記限界荷重Ｗa に近い値にあり，このまま上記ブ
ーム３を起伏駆動すると，上記吊り荷重Ｗが上記限界荷
重Ｗa に達して過負荷となる恐れが高いので，その旨を
知らせる予告音が上記警報・作動停止装置１４から発せ
られ（Ｓ１０７），その後処理が上記工程Ｓ１０１に戻
される。また，上記工程Ｓ１０６において，上記負荷率
が１００％以上であるとの判別が上記過負荷防止部１３
により行われた場合，上記吊り荷重Ｗが既に上記限界荷
重Ｗa を上回っており，そのままにするとクレーン１本
体の転倒を招いたり，機械を破損したりする恐れがある
ため，その旨を表す警報，又は合成音声が上記警報・作
動停止装置１４から発せられると共に，上記警報・作動
停止装置１４からの制御信号に基づいて上記ウインチド
ラム４Ｂ，即ち上記ロープ６Ｂの巻き出しが直ちに停止
させられ，上記ブーム３の起伏駆動が強制的あるいは自
動的に停止させられ（Ｓ１０８），その後処理が上記工
程Ｓ１に戻される。このような上記工程Ｓ１０１乃至Ｓ
１０８で表現される上記クレーンの過負荷装置の動作は
従来装置と同様のものである。[0018] limit load W a (or rated load W 0) as described above is calculated, then the tension detector 1
2, the tension detection signal of the guy cable 6C detected by the cable 2C is read out by the overload state unit 13, and the suspension load calculator 133 applies a suspension load acting on the boom 3 based on the read tension detection signal. W is calculated (S104). Next, the above limit load W a computed in the step S103, and the above suspension load W which is computed in the step S104, the limit load calculator 13
2. From the hanging load calculator 133 to the load factor calculator 1
34 are supplied, a both the ratio W / W a load ratio is calculated by the load factor calculator 134 (S10
5). When the load factor is calculated by the load factor calculator 134, the overload prevention unit 13 determines whether the load factor is 90% or less, in the range of 90% to 100%, or 100%. It is determined whether this is the case (S106). In the step S106, when the load factor is to distinguish between 90% or less has been performed, it means that the critical load W a from the suspension load W is less 10% or more, falling and breakage of the machine or the like There is no danger of the above-mentioned step S101
The processing is returned to. In the above step S106,
If the judgment of the load factor is in a range of 90% to 100% is by the overload prevention unit 13, the suspension load W is a value close to the critical load W a, undulations in this state the boom 3 When driven, since the suspension load W is high may become overloaded reached the critical load W a, notice sound indicating to that effect is issued from the alarm-deactivation device 14 (S107), thereafter the processing is the The process returns to step S101. In the step S106, the overload prevention unit 13 determines that the load factor is 100% or more.
If done by, the suspension load W has already exceeded the limit load W a, or cause the overturning of the crane 1 body when left alone, because it may be damaged machines, alarm indicating that fact Or a synthesized voice is issued from the alarm / operation stopping device 14, and the unwinding of the winch drum 4B, that is, the rope 6B is immediately stopped based on a control signal from the alarm / operation stopping device 14, The up / down driving of the boom 3 is forcibly or automatically stopped (S108), and the process is thereafter returned to the step S1. Such steps S101 to S101
The operation of the crane overload device represented by 108 is similar to that of the conventional device.
【００１９】一方，上記工程Ｓ１０２において，上記ブ
ーム３の起伏角度θが上記下限値θmin 以下の範囲にあ
ると判別された場合，従来装置であれば，上記吊り荷重
Ｗの大きさにかかわらず，荷物が吊り下げられていない
場合でも，処理が上記工程Ｓ１０８に移され，上記警報
・作動停止装置１４により警報，作動停止等が行われて
いたのに対し，本実施の形態に係るクレーンの過負荷防
止装置では，図４に示す如く，上記限界荷重演算器１３
２に保持されている作業半径Ｒ（或いは起伏角度θ）と
荷重Ｗとの対応関係が，上記上限値Ｒmax と上記下限値
Ｒmin との間だけでなく，上記下限値Ｒmin 以下の範囲
でも設定されており，上記下限値Ｒmin（或いはθmin
）以下の場合でも，上記工程Ｓ１０３から上記工程Ｓ
１０８の処理が行われる。即ち，上記工程Ｓ１０２にお
いて，上記ブーム３の起伏角度θが上記下限値θmin 以
下の範囲にあるとの判別が上記過負荷防止部１３により
された場合，本実施の形態に係るクレーンの過負荷防止
装置では，上記作業半径演算器１３１により上記作業半
径Ｒが演算され，上記限界荷重演算器１３２により上記
限界荷重Ｗ a が演算される。また，そのときの吊り荷重
Ｗが上記吊り荷重演算器１３３により演算され，さらに
上記負荷率が上記負荷率演算器１３４により演算され，
上記負荷率に対する判定が行われる。On the other hand, in the step S102, the block
Angle 3 of the arm 3 is in the range below the lower limit value θmin.
If it is determined that the lifting load is
Luggage is not suspended regardless of the size of W
Even in this case, the processing is moved to the step S108,
・ Alarm, operation stop, etc. are performed by the operation stop device 14.
In contrast, the crane according to the present embodiment
In the stopping device, as shown in FIG.
2 and the working radius R (or undulation angle θ)
The correspondence between the load W and the upper limit value Rmax and the lower limit value
Rmin as well as the range below the lower limit Rmin
However, the lower limit value Rmin (or θmin
) Even in the following cases, the above steps S103 to S
The processing of 108 is performed. That is, in the above step S102,
And the up-and-down angle θ of the boom 3 is smaller than the lower limit value θmin.
It is determined by the overload prevention unit 13 that it is in the lower range.
If this is done, prevent the crane according to this embodiment from overloading.
In the device, the work radius calculator 131 performs the work half operation.
The diameter R is calculated, and the limit load calculator 132 calculates the diameter R.
Critical load W aIs calculated. The lifting load at that time
W is calculated by the hanging load calculator 133, and
The load factor is calculated by the load factor calculator 134,
A determination is made for the load factor.
【００２０】ここで，上記限界荷重演算器１３２に保持
される上記作業半径Ｒ（或いは起伏角度θ）と荷重Ｗと
の関係では，上記下限値Ｒmin （θmin ）以下の範囲
で，上記限界荷重Ｗa が，上記定格総荷重Ｗ0 の最小値
Ｗmin よりも小さい値で設定されている。上記上限値Ｒ
max と上記下限値Ｒmin との間の作業許容範囲での限界
荷重Ｗa，或いは定格総荷重Ｗ0 は，荷物が吊り下げら
れており，クレーンの最大能力が要求されることを考慮
して設定されるのに対し，上記下限値Ｒmin 以下の範囲
での限界荷重Ｗa は，荷物が吊り下げられていない場合
を想定して設定されている。上記下限値Ｒmin 以下の範
囲での限界荷重Ｗa は，例えば上記フックブロック８の
重量，又は上記フックブロック８に荷物が吊り下げられ
ていないときの上記張力検出器１２の張力検出信号に基
づいて定められる上記定格総荷重Ｗa の最小値Ｗmin よ
りも小さいほぼ一定の値であり，荷物が吊り下げられて
いない上記フックブロック８を吊持するための必要最小
限の値である。このため，上記作業許容範囲と，上記下
限値Ｒmin 以下との範囲では，上記限界荷重Ｗa は不連
続である。従って，上記フックブロック８に荷物が吊り
下げられていないときに，運転手が上記下限値Ｒmin 以
下の範囲まで上記ブーム３を降下させようとした場合で
も，荷物が吊り下げられていなければ，上記吊り荷重Ｗ
が上記限界荷重Ｗa を上回らないから，上記予告音等が
発せられる場合があるものの，従来装置のように解除ボ
タン等の操作を行う必要なく，上記ブーム３の降下を継
続させることができる。これに対し，上記フックブロッ
ク８に荷物が吊り下げられているにもかかわらず，誤っ
て運転手が上記下限値Ｒmin 以下の範囲まで上記ブーム
３を降下させようとすると，上記下限値Ｒmin に達する
までは上記ブーム３の降下は可能であるものの，上記下
限値Ｒmin において上記限界荷重Ｗa が不連続に大きく
減少するため，上記吊り荷重Ｗが上記限界荷重Ｗa を上
回って上記負荷率が１００％以上となり，上記警報・作
動停止装置１４により警報が発せられると共に，上記ロ
ープ６Ｂ，即ち上記ブーム３の起伏駆動が直ちに停止さ
せられる。Here, in the relationship between the working radius R (or the undulation angle θ) and the load W held in the limit load calculator 132, the limit load W is not more than the lower limit value Rmin (θmin). a is set at a value smaller than the minimum value Wmin of the rated load W 0. The upper limit R
critical load W a of the working tolerance, or rated load W 0 is luggage has suspended, considering that the maximum capacity of the crane is required set between max and the lower limit value Rmin while being, critical load W a in the range of the lower limit value Rmin are set on the assumption that the package is not suspended. Critical load W a in the range of the lower limit Rmin, for example based on the tension detection signal of the tension detector 12 when the weight of the hook block 8, or the luggage to the hook block 8 not suspended This is a substantially constant value smaller than the minimum value Wmin of the determined total rated load Wa, and is a minimum necessary value for suspending the hook block 8 on which no load is suspended. Therefore, the above work tolerance, in the range of less than the lower limit value Rmin, the critical load W a is discontinuous. Therefore, even if the driver attempts to lower the boom 3 to a range equal to or less than the lower limit value Rmin when the luggage is not suspended on the hook block 8, if the luggage is not suspended, Suspension load W
But it does not exceed the critical load W a, although there is a case where the notice sound or the like is emitted, without operating the release button, etc. as in the conventional apparatus, it is possible to continue the descent of the boom 3. On the other hand, if the driver mistakenly attempts to lower the boom 3 to a range equal to or less than the lower limit value Rmin even though the load is hung on the hook block 8, the lower limit value Rmin is reached. although up is possible drop of the boom 3, for the critical load W a decrease discontinuously increased in the lower limit Rmin, the load factor above suspension load W is greater than the critical load W a 100 %, The alarm / operation stop device 14 issues an alarm, and the rope 6B, that is, the up / down driving of the boom 3 is immediately stopped.
【００２１】このように本実施の形態に係るクレーンの
過負荷防止装置によれば，クレーン本体に起伏可能に取
り付けられたブームに作用する吊り荷重が限界荷重を越
える過負荷状態を防止するために，上記限界荷重が，上
記起伏部材の起伏角度或いは作業半径が所定の下限値を
上回る範囲で，上記ブームの起伏角度或いは作業半径に
応じて設定されるだけでなく，上記ブームの起伏角度或
いは作業半径が所定の下限値以下の範囲でも，上記ブー
ムの起伏角度或いは作業半径が所定の下限値を上回る範
囲での最小値よりも小さい値にて設定されるため，ブー
ムが比較的短く荷物が吊り下げられていない場合に，本
来必要でない上記解除操作等を行う必要なく，上記ブー
ムを上記所定の下限値以下の角度まで降下させることが
でき，その結果，クレーンの操作性と安全性を向上させ
ることができる。尚，上記実施の形態では，本発明にお
ける起伏部材の一例として単独のブームを記載していた
が，これに限られるものではなく，複数のブームやジブ
からなるものも上記起伏部材の具体例である。また，本
発明が適用されるクレーンは，例えばクローラクレーン
であるが，これに限られるものではなく，本発明は，起
伏部材の起伏駆動によって生じる過負荷により転倒，機
械破損等の恐れある場合に適用可能である。As described above, according to the crane overload prevention device according to the present embodiment, it is necessary to prevent an overload state in which the suspension load acting on the boom mounted on the crane body so as to be able to undulate exceeds the limit load. The limit load is set not only in accordance with the boom angle or working radius but also in the range where the hoisting angle or working radius of the hoisting member exceeds a predetermined lower limit. Even when the radius is less than or equal to the predetermined lower limit, the boom is set to a value smaller than the minimum value in the range where the boom undulation angle or the working radius is greater than the predetermined lower limit. If the boom has not been lowered, the boom can be lowered to an angle equal to or less than the predetermined lower limit without the necessity of performing the above-described releasing operation and the like which are not originally required. It is possible to improve the operability and safety of the lane. In the above-described embodiment, a single boom is described as an example of the undulating member in the present invention. However, the present invention is not limited to this. A member including a plurality of booms and jib is also a specific example of the undulating member. is there. The crane to which the present invention is applied is, for example, a crawler crane. However, the present invention is not limited to this. Applicable.
【００２２】[0022]
【発明の効果】以上説明した通り，上記請求項１〜５の
いずれか１項に記載のクレーンの過負荷防止装置によれ
ば，クレーン本体に起伏可能に取り付けられた起伏部材
に作用する実荷重が設定荷重を越える過負荷状態を防止
するために，上記設定荷重が，上記起伏部材の起伏量が
所定の下限値を上回る範囲で，上記起伏部材の起伏量に
応じて設定されるだけでなく，上記起伏部材の起伏量が
上記所定の下限値以下の範囲でも，上記起伏部材の起伏
量が所定の下限値を上回る範囲での最小値よりも小さい
値にて設定されるため，起伏部材が比較的短く荷物が吊
り下げられていない場合に，本来必要でない上記解除操
作等を行う必要なく，上記起伏部材を上記所定の下限値
以下の起伏量まで降下させることができ，その結果，ク
レーンの操作性と安全性を向上させることができる。ま
た，上記請求項２に記載のクレーンの過負荷装置のよう
に，上記起伏部材が起伏駆動されている間に，上記実荷
重が上記設定荷重を越えた過負荷状態が判別されると，
上記起伏部材の駆動を自動的に停止させるようにすれ
ば，荷物が吊り下げられているにもかかわらず，誤って
運転手が上記起伏部材を上記所定の下限値以下の角度ま
で降下させようとしても，上記起伏部材の起伏駆動を直
ちに停止させることができる。さらに，上記請求項４に
記載のクレーンの過負荷装置によれば，上記設定荷重
が，上記起伏部材の起伏量が上記所定の下限値以下の範
囲で，上記起伏部材から吊下ロープを介して荷物を吊り
下げるための吊下手段による荷重に基づいて設定される
ため，上記起伏部材を上記所定の下限値以下の起伏量ま
で降下させようとする場合に，上記吊下手段に荷物が吊
り下げられているか否かを自動的に判別することができ
る。As described above, according to the apparatus for preventing overload of a crane according to any one of claims 1 to 5, the actual load acting on the undulating member movably mounted on the crane body. In order to prevent an overload condition that exceeds the set load, the set load is set not only in accordance with the amount of undulation of the undulating member in a range where the undulation of the undulating member exceeds a predetermined lower limit value. Even when the amount of undulation of the undulating member is equal to or less than the predetermined lower limit, the amount of undulation of the undulating member is set to a value smaller than the minimum value in a range exceeding the predetermined lower limit. When the load is not suspended for a relatively short time, the undulating member can be lowered to the undulation amount below the predetermined lower limit without performing the releasing operation or the like that is not originally required, and as a result, the crane Operability and It is possible to improve the total resistance. Further, when an overload state in which the actual load exceeds the set load is determined while the up-and-down member is being driven up and down, as in the overload device for a crane according to claim 2,
If the driving of the undulating member is automatically stopped, the driver may erroneously try to lower the undulating member to an angle equal to or less than the predetermined lower limit, even though the load is suspended. Also, it is possible to immediately stop the undulating drive of the undulating member. Further, according to the overload device for a crane according to the fourth aspect, the set load is set such that the amount of undulation of the undulating member is equal to or less than the predetermined lower limit value and the undulating member is connected to the undulating member via a suspension rope. Since the setting is made based on the load by the suspending means for suspending the load, when the undulating member is to be lowered to the amount of undulation below the predetermined lower limit, the load is suspended by the suspending means. It can be automatically determined whether or not the operation has been performed.
【図１】 本発明の一実施の形態に係るクレーンの過負
荷防止装置の概略構成を示す機能ブロック図。FIG. 1 is a functional block diagram showing a schematic configuration of a crane overload prevention device according to an embodiment of the present invention.
【図２】 上記過負荷防止装置が搭載されるクレーンの
概略構成例を説明するための図。FIG. 2 is a diagram illustrating a schematic configuration example of a crane on which the overload prevention device is mounted.
【図３】 上記過負荷防止装置の動作を説明するための
フローチャート。FIG. 3 is a flowchart for explaining the operation of the overload prevention device.
【図４】 上記過負荷防止装置における吊り荷重と作業
半径との対応関係を説明するための図。FIG. 4 is a view for explaining a correspondence relationship between a hanging load and a working radius in the overload prevention device.
【図５】 従来のクレーンの過負荷防止装置における吊
り荷重と作業半径との対応関係を説明するための図。FIG. 5 is a diagram for explaining a correspondence relationship between a hanging load and a working radius in a conventional crane overload prevention device.
１…クレーン ３…ブーム ４Ａ，４Ｂ…ウインチ ５…ブーム角検出器 ６Ａ，６Ｃ…ロープ ８…フックブロック １２…張力検出器 １３…過負荷防止部 １４…警報・作動停止装置 DESCRIPTION OF SYMBOLS 1 ... Crane 3 ... Boom 4A, 4B ... Winch 5 ... Boom angle detector 6A, 6C ... Rope 8 ... Hook block 12 ... Tension detector 13 ... Overload prevention part 14 ... Alarm / operation stop device
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3F204 AA04 BA02 CA05 FA02 FB19 FC01 FC05 FC08 FD02 FD06 3F205 AA07 CA01 CA09 DA02 HA02 HA06 HB01 HB02 HB04 HC01 HC04 KA10 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F204 AA04 BA02 CA05 FA02 FB19 FC01 FC05 FC08 FD02 FD06 3F205 AA07 CA01 CA09 DA02 HA02 HA06 HB01 HB02 HB04 HC01 HC04 KA10
Claims (5)
た起伏部材に作用する実荷重が設定荷重を越える過負荷
状態を防止するために，上記起伏部材の起伏量が所定の
下限値を上回る範囲で，上記起伏部材の起伏量に応じて
上記設定荷重が設定されるクレーンの過負荷防止装置に
おいて，上記設定荷重が，上記起伏部材の起伏量が上記
所定の下限値以下の範囲でも設定されており，かつ，上
記起伏部材の起伏量が上記所定の下限値を上回る範囲で
の上記設定荷重の最小値よりも小さくなるように設定さ
れてなることを特徴とするクレーンの過負荷防止装置。In order to prevent an overload state in which an actual load acting on an up-and-down member mounted on a crane body so as to be able to undulate exceeds a set load, the up-and-down amount of the up-and-down member exceeds a predetermined lower limit value. In the crane overload prevention device in which the set load is set according to the amount of undulation of the undulating member, the set load is set even in a range where the amount of undulation of the undulating member is equal to or less than the predetermined lower limit. And an overload prevention device for a crane, wherein the amount of undulation of the undulating member is set to be smaller than a minimum value of the set load in a range exceeding the predetermined lower limit value.
に，上記実荷重が上記設定荷重を越えた過負荷状態が判
別されると，上記起伏部材の駆動を自動的に停止してな
る請求項１に記載のクレーンの過負荷防止装置。2. When the overload state in which the actual load exceeds the set load is determined while the up / down member is being driven up / down, the driving of the up / down member is automatically stopped. Item 2. The crane overload prevention device according to Item 1.
る起伏ロープを停止させてなる請求項２に記載のクレー
ンの過負荷防止装置。3. The overload protection device for a crane according to claim 2, wherein an up-and-down rope used for driving up and down the up-and-down member is stopped.
が上記所定の下限値以下の範囲で，上記起伏部材から吊
下ロープを介して荷物を吊り下げるための吊下手段によ
る荷重に基づいて設定されてなる請求項１〜３のいずれ
か１項に記載のクレーンの過負荷防止装置。4. The set load is based on a load by a suspending means for suspending a load from the up-and-down member via a suspension rope when the amount of up-and-down of the up-and-down member is within the predetermined lower limit. The crane overload prevention device according to any one of claims 1 to 3, wherein the crane overload prevention device is set.
度，又は上記起伏部材の起伏角度から演算される上記起
伏部材の作業半径である請求項１〜４のいずれか１項に
記載のクレーンの過負荷防止装置。5. The crane according to claim 1, wherein the amount of undulation is a undulation angle of the undulation member or a working radius of the undulation member calculated from the undulation angle of the undulation member. Overload protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08704899A JP3399397B2 (en) | 1999-03-29 | 1999-03-29 | Crane overload protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08704899A JP3399397B2 (en) | 1999-03-29 | 1999-03-29 | Crane overload protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000281284A true JP2000281284A (en) | 2000-10-10 |
| JP3399397B2 JP3399397B2 (en) | 2003-04-21 |
Family
ID=13904068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08704899A Expired - Fee Related JP3399397B2 (en) | 1999-03-29 | 1999-03-29 | Crane overload protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3399397B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014105090A (en) * | 2012-11-29 | 2014-06-09 | Tadano Ltd | Work confirmation device |
| WO2018074532A1 (en) * | 2016-10-21 | 2018-04-26 | 株式会社タダノ | Crane vehicle |
-
1999
- 1999-03-29 JP JP08704899A patent/JP3399397B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014105090A (en) * | 2012-11-29 | 2014-06-09 | Tadano Ltd | Work confirmation device |
| WO2018074532A1 (en) * | 2016-10-21 | 2018-04-26 | 株式会社タダノ | Crane vehicle |
| JP2018065680A (en) * | 2016-10-21 | 2018-04-26 | 株式会社タダノ | Crane vehicle |
| CN109843776A (en) * | 2016-10-21 | 2019-06-04 | 株式会社多田野 | Derrick car |
| US11053105B2 (en) | 2016-10-21 | 2021-07-06 | Tadano Ltd. | Crane vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3399397B2 (en) | 2003-04-21 |
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