JPH1036040A - Hydraulic elevator device - Google Patents
Hydraulic elevator deviceInfo
- Publication number
- JPH1036040A JPH1036040A JP8215397A JP21539796A JPH1036040A JP H1036040 A JPH1036040 A JP H1036040A JP 8215397 A JP8215397 A JP 8215397A JP 21539796 A JP21539796 A JP 21539796A JP H1036040 A JPH1036040 A JP H1036040A
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- hydraulic
- oil chamber
- valve
- pump
- 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
- Types And Forms Of Lifts (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Elevator Control (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、油圧エレベータに
係り、特にインバータ制御等によって電動機を制御する
ことにより、この電動機によって駆動される油圧ポンプ
の吐出油量を制御する油圧エレベータに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator, and more particularly to a hydraulic elevator in which a motor is controlled by inverter control or the like to control a discharge amount of a hydraulic pump driven by the motor.
【0002】[0002]
【従来の技術】従来の油圧エレベータにおいては、エレ
ベータの走行中に停電が発生すると、乗かごがフリーラ
ンを起こすことがある。この現象は、エレベータの下降
運転時でその速度が小さい場合に起こり、下降運転の高
速運転時や加速時、及び上昇運転時には起こらない。こ
の原因は、下降運転時には、主制御弁を全開し、油圧ポ
ンプを制御することにより作動油の流量を制御している
ことにある。このため、低速運転時に停電が発生する
と、電動機が停止する一方、主制御弁は全開になってい
るため、作動油の流量が急増し、乗かごがフリーラン状
態になり、その後主制御弁が閉じるにしたがって、乗か
ごは減速し、主制御弁が閉じ切ると乗かごは停止する。2. Description of the Related Art In a conventional hydraulic elevator, if a power failure occurs during traveling of the elevator, the car may cause a free run. This phenomenon occurs when the speed of the elevator is low during the descending operation, and does not occur during the high-speed operation of the descending operation, the acceleration, and the ascent operation. This is due to the fact that during the descent operation, the main control valve is fully opened and the hydraulic pump is controlled to control the flow rate of the hydraulic oil. For this reason, if a power failure occurs during low-speed operation, the motor stops, while the main control valve is fully open, so the flow rate of hydraulic oil increases rapidly, the car enters a free-run state, and then the main control valve As the car closes, the car decelerates and stops when the main control valve closes.
【0003】このフリーランを防止する従来技術とし
て、特願平8−160902号がある。この従来技術
は、主制御弁を構成する各油室内の油圧と主制御弁内を
流れる作動油の流量及び方向によって、主制御弁の開度
が自動的に変化するようにしたものである。この従来技
術を図2により説明する。図2は油圧エレベータの全体
構成を示す概略図である。As a prior art for preventing this free run, there is Japanese Patent Application No. 8-160902. In this prior art, the opening degree of the main control valve is automatically changed depending on the oil pressure in each oil chamber constituting the main control valve and the flow rate and direction of the working oil flowing in the main control valve. This prior art will be described with reference to FIG. FIG. 2 is a schematic diagram showing the entire configuration of the hydraulic elevator.
【0004】図において、1は乗かご2を昇降する油圧
ジャッキ、3は電動機4を制御することにより油圧ポン
プ5を駆動する制御部、6はタンクである。7は主制御
弁であり、弁体7a,油圧配管によって油圧ジャッキ1
に連結されたジャッキ側油室7b,油圧ポンプ5に連結
されたポンプ側油室7c,弁体7aの背面側に配置した
背面側油室7d,及び圧縮ばね7eを有している。In FIG. 1, reference numeral 1 denotes a hydraulic jack for raising and lowering the car 2; 3, a control unit for driving a hydraulic pump 5 by controlling an electric motor 4; and 6, a tank. Reference numeral 7 denotes a main control valve, which is a hydraulic jack 1 having a valve body 7a and hydraulic piping.
, A pump-side oil chamber 7c connected to the hydraulic pump 5, a rear-side oil chamber 7d disposed on the rear side of the valve body 7a, and a compression spring 7e.
【0005】8はジャッキ側油室7bと背面側油室7d
間に配置した第1の制御弁である電磁パイロット弁、8
a,8bはソレノイドコイル、9は一方はチェック弁1
0を介してポンプ側油室7cに他方は背面側油室7dに
連結した第2の制御弁である電磁パイロット弁、9aは
ソレノイドコイル、11は電磁パイロット弁8と並列に
配置した絞りである。また、上記各ソレノイドコイル8
a〜9bは制御部3から供給される乗かご2の運転開始
及び停止信号により作動する。Reference numeral 8 denotes a jack-side oil chamber 7b and a rear-side oil chamber 7d.
An electromagnetic pilot valve, which is a first control valve disposed therebetween, 8
a and 8b are solenoid coils, 9 is a check valve 1
The other is an electromagnetic pilot valve, which is a second control valve connected to the pump-side oil chamber 7c through the backside oil chamber 7d through 0, 9a is a solenoid coil, and 11 is a throttle arranged in parallel with the electromagnetic pilot valve 8. . In addition, each solenoid coil 8
a to 9b are operated by the operation start and stop signals of the car 2 supplied from the control unit 3.
【0006】次にこの従来技術の動作について説明す
る。まず、上昇運転の場合を説明すると、制御部3から
の指令により、電動機4が上昇運転方向に回転を始め、
これに連結された油圧ポンプ5が駆動して、油室7cの
圧力が上昇する。更に、ソレノイドコイル8bが励磁し
て電磁パイロット弁8が開き、油室7bと7dの圧力を
等しくする。このため、油室7cと油室7bの圧力によ
る開弁力が、油室7dの圧力とばね7eによる閉弁力を
上回ると、弁体7aは開き始め、乗かご2は上昇を開始
する。Next, the operation of this prior art will be described. First, the case of ascending operation will be described. In response to a command from the control unit 3, the electric motor 4 starts rotating in the ascending operation direction.
The hydraulic pump 5 connected thereto is driven to increase the pressure in the oil chamber 7c. Further, the solenoid coil 8b is excited to open the electromagnetic pilot valve 8, and equalize the pressures of the oil chambers 7b and 7d. Therefore, when the valve opening force due to the pressure in the oil chambers 7c and 7b exceeds the pressure in the oil chamber 7d and the valve closing force due to the spring 7e, the valve element 7a starts to open and the car 2 starts to rise.
【0007】そして、電動機4の回転数の増加に伴っ
て、主制御弁7内を流れる作動油の流量が増加し、この
流量の増加に伴って主制御弁7の開度(弁体7aの移動
量)が大きくなり、乗かご2が加速する。乗かご2が定
格速度で走行して目的階床の減速開始点に来ると、電動
機4の回転数が減少し始め、主制御弁7内の作動油の流
量が減少し、主制御弁7の開度は小さくなっていく。し
たがって、乗かご2は減速を始め、目的階床に着床する
と、主制御弁7内の作動油の流量は0になって主制御弁
7は閉じ、更に電動機4が停止する。また、電磁パイロ
ット弁8はソレノイドコイル8aが励磁するまでそのま
まの位置を保持する。The flow rate of the hydraulic oil flowing through the main control valve 7 increases with an increase in the rotation speed of the electric motor 4, and the opening degree of the main control valve 7 (the opening of the valve body 7a) increases with the increase in the flow rate. The movement amount) increases, and the car 2 accelerates. When the car 2 runs at the rated speed and reaches the deceleration start point of the destination floor, the rotation speed of the electric motor 4 starts to decrease, the flow rate of the hydraulic oil in the main control valve 7 decreases, and the The opening decreases. Therefore, when the car 2 starts decelerating and lands on the destination floor, the flow rate of the hydraulic oil in the main control valve 7 becomes zero, the main control valve 7 closes, and the electric motor 4 stops. The electromagnetic pilot valve 8 keeps its position until the solenoid coil 8a is excited.
【0008】上記のように、上昇運転時は、主制御弁7
の開度は作動油の流量に応じて増減しているため、主制
御弁7の開度は必要最小限になっている。そのため、上
昇運転中に停電が発生した場合でも、主制御弁7内の作
動油の流量が0になるに伴って、主制御弁7は速やかに
閉じるため、作動油が逆流して乗かご2がフリーランを
起こすことはない。As described above, during the ascending operation, the main control valve 7
Is increased or decreased in accordance with the flow rate of the working oil, so that the opening of the main control valve 7 is minimized. Therefore, even if a power failure occurs during the ascending operation, the main control valve 7 closes promptly as the flow rate of the hydraulic oil in the main control valve 7 becomes zero, so that the hydraulic oil flows backward and the car 2 Never free-run.
【0009】次に下降運転の場合を説明する。制御部3
からの指令により、電動機4は、乗かご2の起動ショッ
クの防止のため、まず上昇運転方向に回転し、油室7c
及び油室7cに連結された配管内の圧力を所定圧まで高
める。そして、ソレノイドコイル8a,9aを励磁する
とともに、電動機4を下降運転方向に回転させる。これ
により、油室7c,7dの圧力が下がり始め、油室7c
と油室7bの圧力による開弁力が、油室7dの圧力とば
ね7eによる閉弁力を上回ると、弁体7aは開き始め、
乗かご2は下降を開始する。Next, the case of the descent operation will be described. Control unit 3
, The motor 4 first rotates in the ascending operation direction to prevent the start-up shock of the car 2, and the oil chamber 7 c
And the pressure in the pipe connected to the oil chamber 7c is increased to a predetermined pressure. Then, the solenoid coils 8a and 9a are excited, and the electric motor 4 is rotated in the descending operation direction. As a result, the pressure in the oil chambers 7c and 7d starts to decrease, and the oil chamber 7c
When the valve opening force due to the pressure in the oil chamber 7b exceeds the pressure in the oil chamber 7d and the valve closing force due to the spring 7e, the valve element 7a starts to open,
Car 2 starts descending.
【0010】主制御弁7が開き始めると、油圧ジャッキ
1内の作動油が乗かご2の重量によって押し出され、主
制御弁7を通って、油圧ポンプ5からタンク6へ排出さ
れる。またこの主制御弁7内の作動油の流量の増加に伴
って主制御弁7の開度も大きくなる。このとき、電動機
4は制御部3からの信号によって油圧ポンプ5を駆動
し、作動油の流量を制御して、乗かご2の下降を加速さ
せる。When the main control valve 7 starts to open, the hydraulic oil in the hydraulic jack 1 is pushed out by the weight of the car 2 and is discharged from the hydraulic pump 5 to the tank 6 through the main control valve 7. The opening of the main control valve 7 also increases with an increase in the flow rate of the working oil in the main control valve 7. At this time, the electric motor 4 drives the hydraulic pump 5 according to a signal from the control unit 3 to control the flow rate of the hydraulic oil to accelerate the lowering of the car 2.
【0011】乗かご2が定格速度で走行して目的階床の
減速開始点に来ると、電動機4の回転数が減少し始め、
主制御弁7内の作動油の流量が減少し、主制御弁7の開
度は小さくなっていく。したがって、乗かご2は減速を
始め、目的階床に着床すると、主制御弁7内の作動油の
流量は0になって主制御弁7は閉じ、更に電動機4が停
止するとともに、ソレノイドコイル8a,9aは非励磁
にされる。上記のように、下降運転時においても、主制
御弁7の開度は作動油の流量に応じて増減しており、必
要最小限の開度になっている。When the car 2 travels at the rated speed and reaches the deceleration start point on the destination floor, the rotation speed of the electric motor 4 starts to decrease,
The flow rate of the working oil in the main control valve 7 decreases, and the opening degree of the main control valve 7 decreases. Therefore, when the car 2 starts to decelerate and lands on the destination floor, the flow rate of the hydraulic oil in the main control valve 7 becomes zero, the main control valve 7 closes, the electric motor 4 stops, and the solenoid coil 8a and 9a are de-energized. As described above, even during the lowering operation, the opening of the main control valve 7 increases and decreases in accordance with the flow rate of the working oil, and is the minimum necessary opening.
【0012】下降運転中に停電が発生すると、ソレノイ
ドコイル9aが非励磁になって、電磁パイロット弁9は
閉状態になり、油室7bの作動油は絞り11を通って油
室7dに供給されるため、弁体7aは閉方向に移動し
て、主制御弁7は閉じる。このとき、油室7dに供給さ
れる作動油は絞り11を通るため、主制御弁7はゆっく
り閉じる。そのため、乗かご2に大きなショックを与え
ることがない。このように、下降運転時においても、乗
かご2がフリーランを起こすことはない。When a power failure occurs during the descent operation, the solenoid coil 9a is de-energized, the electromagnetic pilot valve 9 is closed, and the operating oil in the oil chamber 7b is supplied to the oil chamber 7d through the throttle 11. Therefore, the valve element 7a moves in the closing direction, and the main control valve 7 closes. At this time, since the hydraulic oil supplied to the oil chamber 7d passes through the throttle 11, the main control valve 7 closes slowly. Therefore, a large shock is not applied to the car 2. Thus, the car 2 does not run free even during the descent operation.
【0013】[0013]
【発明が解決しようとする課題】前記従来技術において
は、下降運転終了時には、主制御弁7が閉じた後に電磁
パイロット弁9を閉じているため、万一、電磁パイロッ
ト弁9のスプリング破損や作動油中の異物等により、電
磁パイロット弁9が閉じない場合には、背面側油室7d
の作動油が油圧ポンプ5からタンク6へ抜けるため、閉
じていた主制御弁7は再び開き始め、乗かご2は下降す
るという問題がある。また、停電発生時には電磁パイロ
ット弁9が閉じることによって、主制御弁7を閉じてい
るため、同様に電磁パイロット弁9が閉じない場合に
は、主制御弁7は閉じることができず、乗かご2は下降
する。In the above prior art, when the descent operation is completed, the electromagnetic pilot valve 9 is closed after the main control valve 7 is closed. If the electromagnetic pilot valve 9 does not close due to foreign matter in the oil, the rear oil chamber 7d
Is released from the hydraulic pump 5 to the tank 6, the closed main control valve 7 starts to open again, and the car 2 descends. In addition, when the power failure occurs, the main control valve 7 is closed by closing the electromagnetic pilot valve 9. Similarly, if the electromagnetic pilot valve 9 is not closed, the main control valve 7 cannot be closed and the car 2 descends.
【0014】また、電動機4や油圧ポンプ5の故障等に
よって、主制御弁7のポンプ側油室7c側の圧力が立ち
上がっていないときに電磁パイロット弁9が誤励磁する
と、前記と同様に、主制御弁7が開き、乗かご2が下降
する。Further, if the electromagnetic pilot valve 9 is erroneously excited when the pressure on the pump side oil chamber 7c of the main control valve 7 has not risen due to a failure of the electric motor 4 or the hydraulic pump 5, etc. The control valve 7 opens, and the car 2 descends.
【0015】[0015]
【課題を解決するための手段】本発明は、ポンプ側油室
側の圧力によって開閉する手段を第2の制御弁と直列に
設け、第2の制御弁の故障等の異常発生時にも、主制御
弁の開放を阻止できるようにしたものである。According to the present invention, a means for opening and closing by the pressure of the oil chamber on the pump side is provided in series with the second control valve. The opening of the control valve can be prevented.
【0016】[0016]
【発明の実施の形態】本発明の実施の形態は、ポンプ側
油室側の圧力が所定以下のときには、背面側油室からポ
ンプ側油室への作動油の流通を阻止する弁を設け、ポン
プ側油室側の圧力が所定以下になるとこの弁を閉じるこ
とにより、主制御弁の開放を阻止する構成にしたもので
ある。また、本発明の他の実施の形態は、前記弁とし
て、圧力制御弁又はパイロット操作チェック弁を使用し
たものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is provided with a valve for preventing the flow of hydraulic oil from the rear side oil chamber to the pump side oil chamber when the pressure on the pump side oil chamber side is equal to or lower than a predetermined value. When the pressure on the pump-side oil chamber side becomes equal to or less than a predetermined value, this valve is closed to prevent the main control valve from being opened. In another embodiment of the present invention, a pressure control valve or a pilot operation check valve is used as the valve.
【0017】[0017]
【実施例】本発明の一実施例を図1により説明する。図
1は図2に相当する図である。図において、20は第1
の制御弁である電磁パイロット弁8と第2の制御弁であ
る電磁パイロット弁9との間に設置した圧力制御弁、2
1はそのパイロット回路、図2と同一符号は同一のもの
を示している。FIG. 1 shows an embodiment of the present invention. FIG. 1 is a diagram corresponding to FIG. In the figure, 20 is the first
A pressure control valve installed between an electromagnetic pilot valve 8 as a control valve and an electromagnetic pilot valve 9 as a second control valve;
Reference numeral 1 denotes the pilot circuit, and the same reference numerals as those in FIG.
【0018】本実施例の動作について説明すると、上昇
運転時は電磁パイロット弁9は動作させないので、圧力
制御弁20は無関係であり、従来の図2と同一の動作に
なる。乗かご2の下降運転中は、油圧ポンプ5を駆動し
て作動油の流量を制御しているため、パイロット回路2
1の圧力は圧力制御弁20の設定値より高くなってお
り、圧力制御弁20は開いている。乗かご2が目的階床
に着床すると、主制御弁7内の作動油の流量は0になっ
て主制御弁7は閉じ、更に電動機4が停止するととも
に、ソレノイドコイル8a,9aは非励磁にされる。電
動機4が停止して油圧ポンプ5が停止すると、主制御弁
7のポンプ側油室7c側の圧力は急激に低下する。The operation of the present embodiment will be described. Since the electromagnetic pilot valve 9 is not operated during the ascending operation, the pressure control valve 20 is irrelevant, and the operation is the same as that of FIG. During the lowering operation of the car 2, the hydraulic pump 5 is driven to control the flow rate of the working oil, so that the pilot circuit 2
1 is higher than the set value of the pressure control valve 20, and the pressure control valve 20 is open. When the car 2 arrives on the destination floor, the flow rate of the hydraulic oil in the main control valve 7 becomes zero, the main control valve 7 closes, the electric motor 4 stops, and the solenoid coils 8a, 9a are de-energized. To be. When the electric motor 4 stops and the hydraulic pump 5 stops, the pressure of the main control valve 7 on the pump-side oil chamber 7c side drops sharply.
【0019】ここで、何らかの原因により、電磁パイロ
ット弁9が閉じなくなると、背面側油室7dの作動油
は、圧力制御弁20,電磁パイロット弁9を介してポン
プ側油室7c側へ流れようとするが、この回路には、チ
ェック弁10等の抵抗があるため、主制御弁7が開くに
は応答遅れが生じる。一方、ポンプ側油室7c側の圧力
低下によって圧力制御弁20は、ほとんど応答遅れなし
で閉じるため、背面側油室7dの作動油が流出すること
はなく、主制御弁7は閉じる。Here, if the electromagnetic pilot valve 9 cannot be closed for some reason, the hydraulic oil in the rear side oil chamber 7d will flow to the pump side oil chamber 7c through the pressure control valve 20 and the electromagnetic pilot valve 9. However, since this circuit has the resistance of the check valve 10 and the like, a response delay occurs when the main control valve 7 opens. On the other hand, the pressure control valve 20 closes with almost no response delay due to the pressure drop in the pump-side oil chamber 7c, so that the hydraulic oil in the rear-side oil chamber 7d does not flow out, and the main control valve 7 closes.
【0020】また、電動機4や油圧ポンプ5の故障等に
よって、ポンプ側油室7c側の圧力が立ち上がっていな
いときに電磁パイロット弁9が誤励磁した場合であって
も、前記と同様に圧力制御弁20が閉じているため、主
制御弁7が開くことはない。Even if the electromagnetic pilot valve 9 is erroneously excited when the pressure in the pump-side oil chamber 7c has not risen due to a failure of the electric motor 4 or the hydraulic pump 5, the pressure control is performed in the same manner as described above. Since the valve 20 is closed, the main control valve 7 does not open.
【0021】上記のように、本実施例によれば、電磁パ
イロット弁8と9との間に、ポンプ側油室7c側の圧力
によって開閉する圧力制御弁20を配置したため、電磁
パイロット弁9の故障等の異常が発生しても、主制御弁
7の開放を阻止し、乗かご2の下降を阻止することがで
きる。As described above, according to the present embodiment, since the pressure control valve 20 which opens and closes by the pressure of the pump-side oil chamber 7c is disposed between the electromagnetic pilot valves 8 and 9, Even if an abnormality such as a failure occurs, the opening of the main control valve 7 can be prevented, and the lowering of the car 2 can be prevented.
【0022】なお、上記実施例では圧力制御弁20を使
用しているが、これに限ることはなく、パイロット操作
チェック弁など、同様の動作をできるものであれば良
い。In the above embodiment, the pressure control valve 20 is used. However, the present invention is not limited to this, and any device capable of performing the same operation, such as a pilot operation check valve, may be used.
【0023】[0023]
【発明の効果】以上説明したように、本発明によれば、
簡単な装置を追加するのみで、電磁パイロット弁の故障
等による乗かごの降下を防止し、油圧エレベータの安全
性を向上させることができる。As described above, according to the present invention,
Only by adding a simple device, it is possible to prevent the car from lowering due to a failure of the electromagnetic pilot valve or the like, and to improve the safety of the hydraulic elevator.
【図1】本発明の一実施例による油圧エレベータの全体
構成を示す概略図である。FIG. 1 is a schematic diagram showing an overall configuration of a hydraulic elevator according to one embodiment of the present invention.
【図2】従来技術の油圧エレベータの全体構成を示す概
略図である。FIG. 2 is a schematic diagram showing the entire configuration of a conventional hydraulic elevator.
1 油圧ジャッキ 2 乗かご 3 制御部 7 主制御弁 7a 弁体 7b ジャッキ側油室 7c ポンプ側油室 7d 背面側油室 7e ばね 8 第1の制御弁 9 第2の制御弁 20 圧力制御弁 21 パイロット回路 DESCRIPTION OF SYMBOLS 1 Hydraulic jack 2 Car 3 Control part 7 Main control valve 7a Valve body 7b Jack side oil chamber 7c Pump side oil chamber 7d Back side oil chamber 7e Spring 8 First control valve 9 Second control valve 20 Pressure control valve 21 Pilot circuit
Claims (2)
記油圧ジャッキに作動油を供給及び排出する油圧ポンプ
と、前記油圧ジャッキと油圧ポンプとの間に配置され、
正逆両方向に作動油を流通させる主制御弁とを備えたも
のにおいて、 前記主制御弁は、作動油の通路を開閉する弁体と、油圧
ジャッキ側に連結されたジャッキ側油室と、油圧ポンプ
側に連結されたポンプ側油室と、高圧時に前記弁体を閉
方向に付勢する背面側油室と、常時前記弁体を閉方向に
付勢する手段とを備えた構成であり、 乗かごの上昇運転中に前記ジャッキ側油室と前記背面側
油室間の作動油の流通を可能にする第1の手段と、乗か
ごの下降運転中に前記ジャッキ側油室から前記背面側油
室への作動油の流量を制限する第2の手段と、乗かごの
下降運転中に前記背面側油室から前記ポンプ側油室への
作動油の流通を可能にする第3の手段とを備えたものに
おいて、 前記ポンプ側油室側の圧力が所定以下のときには、前記
背面側油室から前記ポンプ側油室への作動油の流通を阻
止する手段を備えたことを特徴とする油圧エレベータ装
置。A hydraulic jack for raising and lowering a car; a hydraulic pump for supplying and discharging hydraulic oil to and from the hydraulic jack; and a hydraulic pump disposed between the hydraulic jack and the hydraulic pump;
A main control valve that allows hydraulic oil to flow in both forward and reverse directions, wherein the main control valve includes a valve body that opens and closes a passage for hydraulic oil, a jack-side oil chamber connected to a hydraulic jack, A pump-side oil chamber connected to a pump side, a rear-side oil chamber that urges the valve body in the closing direction at high pressure, and a unit that constantly urges the valve body in the closing direction, First means for allowing hydraulic oil to flow between the jack-side oil chamber and the rear-side oil chamber during the ascending operation of the car, and the back-side side from the jack-side oil chamber during the descending operation of the car Second means for restricting the flow rate of the hydraulic oil to the oil chamber, and third means for allowing the flow of the hydraulic oil from the rear oil chamber to the pump oil chamber during the lowering operation of the car. When the pressure on the pump-side oil chamber side is equal to or less than a predetermined value, the rear-side oil chamber Hydraulic elevator apparatus characterized by comprising means for preventing the flow of hydraulic fluid to et the pump-side oil chamber.
力制御弁又はパイロット操作チェック弁であることを特
徴とする請求項1記載の油圧エレベータ装置。2. The hydraulic elevator apparatus according to claim 1, wherein the means for blocking the flow of the hydraulic oil is a pressure control valve or a pilot operation check valve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21539796A JP3371705B2 (en) | 1996-07-25 | 1996-07-25 | Hydraulic elevator equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21539796A JP3371705B2 (en) | 1996-07-25 | 1996-07-25 | Hydraulic elevator equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1036040A true JPH1036040A (en) | 1998-02-10 |
JP3371705B2 JP3371705B2 (en) | 2003-01-27 |
Family
ID=16671653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21539796A Expired - Fee Related JP3371705B2 (en) | 1996-07-25 | 1996-07-25 | Hydraulic elevator equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3371705B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108203043A (en) * | 2016-12-16 | 2018-06-26 | 奥的斯电梯公司 | For the hydraulic starting formula shutoff valve of hydraulic elevator system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10246302B2 (en) | 2014-06-16 | 2019-04-02 | Thyssenkrupp Elevator Corporation | Auxiliary pumping unit |
-
1996
- 1996-07-25 JP JP21539796A patent/JP3371705B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108203043A (en) * | 2016-12-16 | 2018-06-26 | 奥的斯电梯公司 | For the hydraulic starting formula shutoff valve of hydraulic elevator system |
US10647546B2 (en) | 2016-12-16 | 2020-05-12 | Otis Elevator Company | Hydraulically activated shutoff valve for a hydraulic elevator system |
Also Published As
Publication number | Publication date |
---|---|
JP3371705B2 (en) | 2003-01-27 |
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