JP4580828B2 - Elevator equipment - Google Patents

Elevator equipment Download PDF

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JP4580828B2
JP4580828B2 JP2005192383A JP2005192383A JP4580828B2 JP 4580828 B2 JP4580828 B2 JP 4580828B2 JP 2005192383 A JP2005192383 A JP 2005192383A JP 2005192383 A JP2005192383 A JP 2005192383A JP 4580828 B2 JP4580828 B2 JP 4580828B2
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sheave
rope
test
emergency stop
test jig
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JP2007008669A (en
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尚文 尾方
貴 安部
秀佳 松岡
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Hitachi Ltd
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Hitachi Ltd
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Description

本発明は、エレベータ装置に係り、特に、インバータ制御されるエレベータにあって、非常時に乗かごの昇降を阻止する非常止め手段の試験を行うのに好適なエレベータ装置に関する。   The present invention relates to an elevator apparatus, and more particularly to an elevator apparatus suitable for testing an emergency stop means for preventing an elevator from moving up and down in an elevator controlled by an inverter.

図７は従来のエレベータ装置の概略構成図である。   FIG. 7 is a schematic configuration diagram of a conventional elevator apparatus.

一般に、エレベータ装置は図７に示すように、乗かご２とつり合いおもり４とを繋ぐロープ８を電動機５に接続された綱車１および反らせ車７に巻き掛け、綱車１を電動機５で回転させ綱車１とロープ８との間の摩擦力により乗かご２を昇降させるものであり、電動機５を駆動・制御するために可変電圧可変周波数の交流電源を供給するインバータ装置６を備えている。また、エレベータにはさまざまな安全装置を備えることが義務付けられており、そのうちの１つとして乗かご２には非常時に図示しないガイドレール把持して乗かご２の昇降を阻止する非常止め手段３が備えられている。   In general, as shown in FIG. 7, the elevator apparatus winds a rope 8 that connects the car 2 and the counterweight 4 around the sheave 1 and the warp 7 that are connected to the electric motor 5, and the sheave 1 is rotated by the electric motor 5. The car 2 is moved up and down by the frictional force between the sheave 1 and the rope 8, and is provided with an inverter device 6 that supplies AC power of variable voltage and variable frequency to drive and control the electric motor 5. . Further, the elevator is required to be provided with various safety devices, and as one of them, the elevator 2 has an emergency stop means 3 for holding the guide rail (not shown) in an emergency to prevent the elevator 2 from moving up and down. Is provided.

そして、このようなエレベータ装置にあっては、非常止め手段３の安全性を検証するために定期的に行われる非常止め試験が義務付けられている。この非常止め試験は乗かご２に取り付けられた非常止め手段３を作動させて乗かご２を停止させ、綱車１を電動機５により乗かご２が下降する方向に回転させる。この時、綱車１の回転によりつり合いおもり４側から乗かご２側にロープ８ｂが送り出されるが、乗かご２は非常止め手段により停止しているので、乗かご２側のロープ８ａが緩む。さらに綱車１はつり合いおもり４側から乗かご２側にロープ８ｂを送り出そうとするが、ついには綱車１とロープ８ａ、８ｂとの間の摩擦力がつり合いおもり４の重さに耐えられなくなり綱車１は空転する。この時、非常止め３が正常に機能していなければ、綱車１がつり合いおもり４側から乗かご２側に送り込んだロープ８ｂの分だけ乗かご２が下降するので、綱車１は空転しない。このようにして乗かご２に取り付けられた非常止め手段３を作動させ、綱車１を空転させることにより、非常止め手段３の安全性を検討することができる。この非常止め試験にあって綱車１を空転させるためには大きなトルクが必要であり、綱車１を空転させるためのトルクTは式(１)で表される。   And in such an elevator apparatus, in order to verify the safety | security of the emergency stop means 3, the emergency stop test regularly performed is obliged. In this emergency stop test, the emergency stop means 3 attached to the car 2 is operated to stop the car 2, and the sheave 1 is rotated by the electric motor 5 in the direction in which the car 2 is lowered. At this time, the rope 8b is sent out from the counterweight 4 side to the car 2 side by the rotation of the sheave 1, but since the car 2 is stopped by the emergency stop means, the rope 8a on the car 2 side is loosened. Furthermore, the sheave 1 tries to send out the rope 8b from the counterweight 4 side to the car 2 side, but finally the frictional force between the sheave 1 and the ropes 8a, 8b withstands the weight of the counterweight 4. The sheave 1 will run idle. At this time, if the emergency stop 3 is not functioning properly, the sheave 1 is lowered by the amount of the rope 8b that the sheave 1 has sent from the counterweight 4 side to the car 2 side, so the sheave 1 will not idle. . The safety of the emergency stop means 3 can be examined by operating the emergency stop means 3 attached to the car 2 in this way and causing the sheave 1 to idle. In this emergency stop test, a large torque is required to idle the sheave 1 and the torque T for causing the sheave 1 to idle is expressed by equation (1).

Ｔ＝Ｔ２（１−１／ｅμｋθ）Ｄ／２・・・（１）
なお、ここでT２はつり合いおもり４側のロープ張力、μは綱車１とロープ８との間の摩擦係数、ｋは綱車１の溝形状によって決まる係数（以下、溝形状係数）、θは綱車１に巻き掛けられたロープ８の角度、Dは綱車１の直径である。また、ｅμｋθは綱車１のエレベータ通常運転時のトラクション能力、つまり通常運転時に綱車１が空転することなく乗かご２を昇降可能な、乗かご２側のロープ張力T１とつり合いおもり４側の張力T２の最大張力差T２/T１のことである。非常止め試験時に綱車１を空転させるためには、電動機５のトルクが上式(1)のトルクTよりも大きい必要があり、そのため電動機５の大型化・インバータ装置６の大容量化が必要となる。 T = T2 (1-1 / e μkθ ) D / 2 (1)
Here, T2 is the rope tension on the counterweight 4 side, μ is a coefficient of friction between the sheave 1 and the rope 8, k is a coefficient determined by the groove shape of the sheave 1 (hereinafter referred to as groove shape factor), and θ is The angle of the rope 8 wound around the sheave 1, D is the diameter of the sheave 1. Further, e μkθ is the traction capacity of the sheave 1 during normal operation of the elevator, that is, the rope tension T1 on the side of the car 2 and the weight 4 side that can raise and lower the car 2 without causing the sheave 1 to idle during normal operation. The maximum tension difference T2 / T1 of the tension T2. In order to idle the sheave 1 during the emergency stop test, the torque of the electric motor 5 needs to be larger than the torque T in the above equation (1), so that the electric motor 5 must be enlarged and the capacity of the inverter device 6 must be increased. It becomes.

このため、従来、電動機５の大型化・インバータ装置６の大容量化を避けるために、非常止め試験時に、上式(1)のｅμｋθの値を小さくする、つまり綱車１のトラクション能力を小さくして非常止め試験に必要なトルクTを小さくする方法が提案されている。すなわち、反らせ車７の位置を上昇させて綱車１に巻き掛けられたロープ８の角度θを小さくする図示しない試験用反らせ車を使って綱車１と反らせ車７との間のロープ８を上昇させて綱車１に巻き掛けられたロープ８の角度θを小さくすることにより綱車１のトラクション能力を小さくして、上式(1)で表される非常止め試験に必要な電動機のトルクTを小さくしている。その結果、電動機５およびインバータ装置６の容量を小さくすることが可能となるものである（例えば、特許文献１参照）。
特開２００２−３４８０７３号公報 For this reason, conventionally, in order to avoid the increase in the size of the electric motor 5 and the increase in the capacity of the inverter device 6, the value of e μkθ in the above equation (1) is reduced during the emergency stop test, that is, the sheave 1 has a traction capability. A method has been proposed in which the torque T required for the emergency stop test is reduced. That is, the rope 8 between the sheave 1 and the warping wheel 7 is lowered by using a test warping wheel (not shown) that raises the position of the warping wheel 7 to reduce the angle θ of the rope 8 wound around the sheave 1. The torque of the motor required for the emergency stop test expressed by the above equation (1) is reduced by reducing the angle θ of the rope 8 that is wound around the sheave 1 and making the traction capacity of the sheave 1 smaller. T is reduced. As a result, it is possible to reduce the capacity of the electric motor 5 and the inverter device 6 (see, for example, Patent Document 1).
JP 2002-348073 A

しかしながら、前述の従来例では、反らせ車７または試験用反らせ車を使って綱車１と既設反らせ車７の間のロープ８を上昇させ、綱車１に巻き掛けられたロープ８の角度θを小さくするものであることから、反らせ車７を上昇させるための機構が必要となる。またロープ８を上昇させるためには、反らせ車７または試験用反らせ車により、ロープ８の上昇量に相当する分だけつり合いおもり４を持ち上げることになる。したがってつり合いおもり４の質量に耐えながら反らせ車７を上昇させるため、その上昇機構は大型化・複雑化せざるを得ないという問題がある。   However, in the above-described conventional example, the rope 8 between the sheave 1 and the existing curving wheel 7 is raised using the warping wheel 7 or the test warping wheel, and the angle θ of the rope 8 wound around the sheave 1 is set. Since it is made small, a mechanism for raising the curving wheel 7 is required. In order to raise the rope 8, the counterweight 4 is lifted by the amount corresponding to the amount of the rope 8 raised by the warp wheel 7 or the test warp wheel. Therefore, since the curving wheel 7 is raised while withstanding the mass of the counterweight 4, there is a problem that the raising mechanism must be increased in size and complexity.

本発明は、上述した従来技術における実状からなされたもので、その目的は、簡易な構造で、電動機およびインバータを小型化することのできるエレベータ装置を提供することにある。   The present invention has been made from the actual situation in the above-described prior art, and an object of the present invention is to provide an elevator apparatus capable of downsizing an electric motor and an inverter with a simple structure.

前記目的を達成するために、本発明は、可変電圧可変周波数の交流電源を供給するインバータと、このインバータの出力側に接続された電動機と、この電動機により回転駆動する綱車と、この綱車に巻き掛けられたロープの一端に連結された乗かごと、前記ロープの他端に連結されたつり合いおもりと、前記乗かごに取付けられ非常時にガイドレールを把持して前記乗かごの昇降を阻止する非常止め手段を備えたエレベータ装置において、前記非常止め手段の試験時に前記綱車と前記ロープとの間に介在され、その外周面に溝が形成される着脱可能な試験用治具を備え、前記綱車の前記ロープに対するトラクション能力をエレベータ通常運転時よりも小さくすることを特徴としている。   In order to achieve the above object, the present invention provides an inverter for supplying AC power of variable voltage and variable frequency, an electric motor connected to the output side of the inverter, a sheave that is driven to rotate by the electric motor, and the sheave A cage connected to one end of a rope wound around, a counterweight connected to the other end of the rope, and a guide rail attached to the cage to hold the guide rail in an emergency to prevent the elevator from going up and down In an elevator apparatus equipped with an emergency stop means, a removable test jig that is interposed between the sheave and the rope during the test of the emergency stop means and has a groove formed on the outer peripheral surface thereof, It is characterized in that the traction capacity of the sheave with respect to the rope is made smaller than that during normal elevator operation.

このように構成した本発明は、前記非常止め手段の試験時に、前記綱車と前記ロープとの間に試験用治具を介在させ、この試験用治具の外周面に形成された前記溝に前記ロープが係合するようにし、前記綱車の前記ロープに対するトラクション能力をエレベータ通常運転時よりも小さくする。これによって、前記綱車と前記ロープとの間に試験用治具を介在させるという簡易な構造で、非常止め試験時に必要な電動機のトルクを小さくすることができる。   In the present invention configured as described above, a test jig is interposed between the sheave and the rope during the test of the emergency stop means, and the groove formed on the outer peripheral surface of the test jig is provided in the groove. The rope is engaged, and the traction capability of the sheave with respect to the rope is made smaller than that during normal elevator operation. Thereby, the torque of the electric motor required at the time of an emergency stop test can be reduced with a simple structure in which a test jig is interposed between the sheave and the rope.

本発明は、試験用治具を綱車とロープとの間に介在させることにより、非常止め試験時の綱車のトラクション能力を小さくし、非常止め試験時に必要な電動機のトルクを小さくすることができ、したがって、電動機とインバータ装置の小型化が可能となる。また、綱車のトラクション能力を小さくするための試験用治具は簡易な構造であることから、低コストなものとすることできる。   In the present invention, by interposing a test jig between the sheave and the rope, the traction capacity of the sheave during the emergency stop test can be reduced, and the torque of the electric motor required during the emergency stop test can be reduced. Therefore, the electric motor and the inverter device can be downsized. Moreover, since the test jig for reducing the traction capability of the sheave has a simple structure, it can be made low-cost.

以下、本発明に係るエレベータ装置の実施の形態を図に基づいて説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an elevator apparatus according to the present invention will be described with reference to the drawings.

図１は本発明のエレベータ装置の実施形態を示す概略構成図、図２は試験用治具の正面図、図３は試験用治具を綱車に装着した状態を示す側面図、図４は試験用治具を綱車に装着した状態を示す断面図、図５は試験用治具の連結部を示す図３Ａ部の要部拡大図、図６は綱車にロープが巻き掛けられた状態を示す断面図である。なお、前述した図７に示すものと同等のものには同一符号を付してある。すなわち、１は綱車、２は乗かご、３は非常止め手段、４はつり合いおもり、５は電動機、６はインバータ装置、７は反らし車、８はロープである。   1 is a schematic configuration diagram showing an embodiment of an elevator apparatus according to the present invention, FIG. 2 is a front view of a test jig, FIG. 3 is a side view showing a state in which the test jig is mounted on a sheave, and FIG. FIG. 5 is a cross-sectional view showing a state in which the test jig is mounted on the sheave, FIG. 5 is an enlarged view of a main part of FIG. 3A showing the connecting portion of the test jig, and FIG. 6 is a state in which a rope is wound around the sheave FIG. In addition, the same code | symbol is attached | subjected to the thing equivalent to what was shown in FIG. 7 mentioned above. That is, 1 is a sheave, 2 is a passenger car, 3 is an emergency stop means, 4 is a counterweight, 5 is an electric motor, 6 is an inverter device, 7 is a warping wheel, and 8 is a rope.

本実施形態のエレベータ装置は図１、２に示すように、非常止め手段３の試験時に、綱車２とロープ８との間に介在され、その外周面に溝１１ａが形成される着脱可能な試験用治具１１が備えられている。また、試験用治具１１は、例えば３分割構造となっており、図１はその一部が綱車１１に取り付けられた状態となっている。さらに、試験用治具１１は図２に示すように、綱車１外形と同一形状の円形薄板で、３分割された試験用治具１１のそれぞれを連結することにより綱車１の全周を覆う形状となっている。さらにまた、試験用治具１１は図４に示すように、その内周面は綱車１の溝１ａに沿ってはまり込むように凸型形状となっているとともに、試験用治具１１の外周面は図２および図６に示すように、綱車１の溝ピッチと同一ピッチで、綱車１の溝角度γよりも大きい溝角度γ’を持つ溝型が施されている。また、分割された試験用治具１１の連結部は図５に示すように、互いの端部がブラケット１２により接続され綱車１の外周に装着される。なお、３分割された試験用治具１１のうち、１枚目に綱車１に装着される試験用治具１１の先端形状は、ロープ８が無理なく試験用治具１１に乗り上げられるようにテーパが設けられている。   As shown in FIGS. 1 and 2, the elevator apparatus according to the present embodiment is detachable so as to be interposed between the sheave 2 and the rope 8 during the test of the emergency stop means 3 and to have a groove 11 a formed on the outer peripheral surface thereof. A test jig 11 is provided. Further, the test jig 11 has, for example, a three-part structure. FIG. 1 shows a state in which a part thereof is attached to the sheave 11. Further, as shown in FIG. 2, the test jig 11 is a circular thin plate having the same shape as the outer shape of the sheave 1. By connecting each of the test jigs 11 divided into three parts, the entire circumference of the sheave 1 is made. It has a shape to cover. Furthermore, as shown in FIG. 4, the test jig 11 has a convex shape so that its inner peripheral surface fits along the groove 1 a of the sheave 1, and the outer periphery of the test jig 11. As shown in FIGS. 2 and 6, the surface is provided with a groove mold having the same pitch as the groove pitch of the sheave 1 and a groove angle γ ′ that is larger than the groove angle γ of the sheave 1. Further, as shown in FIG. 5, the divided connecting portions of the test jig 11 are attached to the outer periphery of the sheave 1 with their ends connected by a bracket 12. Note that the tip shape of the test jig 11 mounted on the sheave 1 as the first piece among the three divided test jigs 11 is such that the rope 8 can easily ride on the test jig 11. A taper is provided.

本実施形態にあっては、非常止め手段３の試験を行う際、エレベータを低速運転させ、図１に示すように試験用治具１１を、綱車１上のロープ８が巻き掛けられていない部分から綱車１とロープ８との間に巻き込むようにして３分割されたものを順次装着していく。このとき、分割された試験用治具１１の互いの端部をブラケット１２により連結し、最終的には試験用治具１１が綱車１を完全に覆い、綱車１と試験用治具１１が一体となって回転する。このようにして綱車１の溝角度γよりも大きい溝角度γ’にロープ８が摺接することにより、前述した式(１)中の溝形状係数kの値を小さくする。すなわち、溝形状係数kの値は溝の形状によって決まり、特に、溝の角度の影響を大きく受け、溝角度が大きくなることに応じて溝形状係数kが小さくなり、ひいては綱車１１のトラクション能力が小さくなる。この状態で非常止め試験を行うことにより、非常止め試験時に電動機５が発生しなければならない必要トルクTを小さくすることが可能となる。   In the present embodiment, when the emergency stop means 3 is tested, the elevator is operated at a low speed, and the test jig 11 is not wrapped around the rope 8 on the sheave 1 as shown in FIG. The parts divided into three so as to be caught between the sheave 1 and the rope 8 from the part are sequentially attached. At this time, the ends of the divided test jigs 11 are connected by the bracket 12, and finally the test jig 11 completely covers the sheave 1, and the sheave 1 and the test jig 11 Rotate together. In this way, the value of the groove shape factor k in the above-described equation (1) is reduced by the rope 8 slidingly contacting the groove angle γ ′ larger than the groove angle γ of the sheave 1. That is, the value of the groove shape factor k is determined by the shape of the groove. In particular, the groove shape factor k is greatly influenced by the groove angle, and the groove shape factor k decreases as the groove angle increases. Becomes smaller. By performing the emergency stop test in this state, it is possible to reduce the required torque T that the motor 5 must generate during the emergency stop test.

このように構成した本実施形態では、試験用治具１１を綱車１とロープ８との間に介在させることにより、非常止め試験時の綱車１のトラクション能力を小さくし、非常止め試験時に必要な電動機５のトルクを小さくすることができ、したがって、電動機５とインバータ装置６の小型化が可能となる。また、綱車１のトラクション能力を小さくするための試験用治具１１は簡易な構造であることから、低コストなものとすることできる。   In this embodiment configured as described above, by interposing the test jig 11 between the sheave 1 and the rope 8, the traction capability of the sheave 1 during the emergency stop test is reduced, and during the emergency stop test. The required torque of the electric motor 5 can be reduced, and therefore the electric motor 5 and the inverter device 6 can be reduced in size. Moreover, since the test jig 11 for reducing the traction capability of the sheave 1 has a simple structure, the cost can be reduced.

なお、前述した実施形態では、試験用治具１１の外周に施された溝１１ａの角度γ’を、綱車１の溝角度γよりも大きくすることによって溝形状係数kを小さくして、綱車１のトラクション能力を小さくしたが、本発明はこれに限らず、試験用治具の摩擦係数μを小さくすることによって、綱車１のトラクション能力を小さくすることもできる。すなわち、試験用治具の構造概要は前述した実施形態とほぼ同一とし、試験用治具の材質を綱車1の材質よりも低摩擦なものに変更したり、または試験用治具の外周面の溝部にコーティング処理を施したりし、試験用治具の溝部の摩擦係数を綱車１の摩擦係数よりも小さくして、綱車１のトラクション能力を小さくすることができる。また、試験用治具の摩擦係数μを小さくするとともに、前述した実施形態と同様に試験用治具の外周面の溝角度γ’を綱車１の溝角度γよりも大きくすることにより、さらに大きなトラクション低下効果を得ることも可能できる。さらに、摩擦係数が小さく容易に変形する薄いシートを綱車１とロープ８の間に巻き込むことにより、綱車１のトラクション能力を小さくすることも可能である。   In the above-described embodiment, the groove shape factor k is reduced by making the angle γ ′ of the groove 11a provided on the outer periphery of the test jig 11 larger than the groove angle γ of the sheave 1, thereby reducing the groove shape factor k. Although the traction capability of the vehicle 1 is reduced, the present invention is not limited to this, and the traction capability of the sheave 1 can also be reduced by reducing the friction coefficient μ of the test jig. That is, the structural outline of the test jig is almost the same as that of the above-described embodiment, and the material of the test jig is changed to one having lower friction than the material of the sheave 1 or the outer peripheral surface of the test jig. It is possible to reduce the traction capacity of the sheave 1 by applying a coating process to the groove portion of the sheave 1 or making the friction coefficient of the groove portion of the test jig smaller than the friction coefficient of the sheave 1. Further, by reducing the friction coefficient μ of the test jig and making the groove angle γ ′ of the outer peripheral surface of the test jig larger than the groove angle γ of the sheave 1 as in the above-described embodiment, It is also possible to obtain a large traction reduction effect. Furthermore, the traction capability of the sheave 1 can be reduced by winding a thin sheet having a small coefficient of friction and easily deformed between the sheave 1 and the rope 8.

本発明のエレベータ装置の実施形態を示す概略構成図である。It is a schematic structure figure showing an embodiment of an elevator apparatus of the present invention. 試験用治具の正面図である。It is a front view of the jig for a test. 試験用治具を綱車に装着した状態を示す側面図である。It is a side view which shows the state which mounted | wore the sheave with the test jig. 試験用治具を綱車に装着した状態を示す断面図である。It is sectional drawing which shows the state which mounted | wore the sheave with the test jig. 試験用治具の連結部を示す要部拡大図である。It is a principal part enlarged view which shows the connection part of the jig for a test. 綱車にロープが巻き掛けられた状態を示す断面図である。It is sectional drawing which shows the state by which the rope was wound around the sheave. 従来のエレベータ装置の概略構成図である。It is a schematic block diagram of the conventional elevator apparatus.

符号の説明Explanation of symbols

１ 綱車
２ 乗かご
３ 非常止め手段
４ つり合いおもり
５ 電動機
６ インバータ装置
７ 反らし車
８ ロープ
１１ 試験用治具
１１ａ 溝
１２ ブラケット DESCRIPTION OF SYMBOLS 1 Sheave 2 Passenger car 3 Emergency stop means 4 Balance weight 5 Electric motor 6 Inverter device 7 Warpage wheel 8 Rope 11 Test jig 11a Groove 12 Bracket

Claims (2)

可変電圧可変周波数の交流電源を供給するインバータと、このインバータの出力側に接続された電動機と、この電動機により回転駆動する綱車と、この綱車に巻き掛けられたロープの一端に連結された乗かごと、前記ロープの他端に連結されたつり合いおもりと、前記乗かごに取付けられ非常時にガイドレールを把持して前記乗かごの昇降を阻止する非常止め手段を備えたエレベータ装置において、
前記非常止め手段の試験時に前記綱車と前記ロープとの間に介在され、その外周面に溝が形成される着脱可能な試験用治具を備え、前記綱車の前記ロープに対するトラクション能力をエレベータ通常運転時よりも小さくすることを特徴とするエレベータ装置。 An inverter that supplies AC power of variable voltage and variable frequency, an electric motor connected to the output side of the inverter, a sheave that is driven to rotate by the electric motor, and one end of a rope wound around the sheave In an elevator apparatus comprising a counterweight connected to the other end of the rope, an emergency stop means attached to the car and holding a guide rail in an emergency to prevent the car from moving up and down,
A detachable test jig interposed between the sheave and the rope at the time of testing the emergency stop means and having a groove formed on the outer peripheral surface thereof, the traction ability of the sheave with respect to the rope is provided in an elevator. An elevator apparatus characterized by being smaller than that during normal operation. 前記試験用治具は、分割可能であることを特徴とする請求項１記載のエレベータ装置。   The elevator apparatus according to claim 1, wherein the test jig is separable.
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JP5076525B2 (en) * 2007-02-05 2012-11-21 株式会社日立製作所 Test method for emergency stop device of elevator equipment
WO2009075012A1 (en) * 2007-12-10 2009-06-18 Mitsubishi Electric Corporation Method for testing emergency stop of elevator and device for testing the emergency stop of the same
JP5174894B2 (en) * 2008-04-08 2013-04-03 三菱電機株式会社 Elevator apparatus and test method thereof
DE112014006631B4 (en) * 2014-04-30 2021-05-27 Mitsubishi Electric Corporation Elevator system and elevator test method
WO2018092308A1 (en) * 2016-11-21 2018-05-24 三菱電機株式会社 Inspection method for elevator emergency stop device

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JPS59153793A (en) * 1983-02-14 1984-09-01 株式会社東芝 Traction sheave for elevator
JP2001287877A (en) * 2000-04-04 2001-10-16 Hitachi Building Systems Co Ltd Main rope replacement method and device for elevator
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