JPH0653554B2 - Hydraulic elevator system and its tampering alarm method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator, and more particularly to a technique for issuing a warning against forced vibration (mischievous oscillation) due to mischief of a hydraulic elevator.

[Conventional technology]

In the elevator, the car may be subjected to forced vibration due to the mischief of the passenger, and if the vibration becomes significant, the governor may malfunction and the passenger may be trapped in the car.

In order to eliminate such inconvenience, conventionally, as disclosed in, for example, JP-A-56-108680, JP-A-58-69687 and JP-A-59-203081, the vibration resistance of the governor is improved. It has been designed to prevent the vibration of the car from being transmitted to the governor rope by providing a spring or the like at the connection between the car and the governor rope.

However, such a means is, for example, for a hydraulic elevator, in which a spring constant of an oil system is added in addition to a rope system, and the car is easily forcibly excited at a low natural frequency (usually 2 to 3 Hz). However, there is a limit to the correspondence. In particular, it is technically very difficult to increase the vibration resistance of several Hz (in this case, it is necessary to set the governor natural frequency to about 1 Hz). There is a problem that the governor is likely to malfunction due to the influence of overshoot at the end of acceleration.

Therefore, recently, for example, No. 60-64961 and No. 60
As disclosed in Japanese Unexamined Patent Publication No. 64962, mischievous vibrations are detected from acceleration or rope slack when the car is vertically rocked, and an alarm is issued at the initial stage of car rocking, for example.

[Problems to be Solved by the Invention]

Such a conventional tampering alarm device is effective in stopping the nuisance swinging that calls attention to passengers, but has the following points for improvement.

For example, in the case of detecting tampering swing due to acceleration as described above, in addition to the tampering swing of the elevator car, the elevator car can be operated normally by passengers getting in and out of loading and unloading the cargo. Since vibration acceleration also occurs, it is necessary to set an acceleration reference value for tampering swing detection (reference acceleration for issuing an alarm) so as not to be confused with the vibration acceleration generated by these normal operations. From the above, the acceleration reference value g ₁ (gal) is
It is necessary to make it larger than the vibration acceleration g ₂ of loading and unloading (here, g ₂ is the largest value in the allowable range), and smaller than the vibration resistance acceleration g _{3 of the} guide in order to prevent malfunction of the governor (g ₂ <G ₁ <g ₃ ).

When the reference acceleration g ₁ is set in this way, there is no problem in detecting the mischievous swing when the elevator is stopped, but the following problems occur during traveling of the elevator. This will be described with reference to FIG.

FIG. 4 is an explanatory diagram showing an elevator traveling state, and shows a series of states of acceleration, rated speed, deceleration, and stop of the elevator. As shown in the figure, for example, if there is a mischievous swing in the car while traveling at the rated speed, the acceleration g of this swing g
Rides on the traveling speed V ₂ and the speed changes to V ′. In this case, 'becomes more than the velocity V' acceleration g one large g but will reach the operating speed also Gabanasuitsuchi (Gabanasuitsuchi operating point) V _3, the acceleration g at this time ', the acceleration in the general elevator stop The relationship is smaller than the reference value g ₁ (g ′ <g ₁ ). Normally, the acceleration reference value g ₁ determined with the elevator stopped as a reference and the acceleration g ′ that causes the governor to malfunction during elevator traveling are g ₁ ≈1.
It is about 5 g '. Therefore, even if the acceleration reference value (warning generation reference value) g ₁ of the corner angle and the mischievous swing is set, the governor malfunctions before the acceleration g ₁ is reached, that is, before the alarm is issued while the elevator is traveling. It may happen.

In addition to the acceleration, when the vertical swing of the car is detected from the looseness of the rope, the same problem as described above occurs.

The present invention has been made in view of the above points, and an object thereof is to constantly detect a mischievous swing accurately and issue an alarm, regardless of whether the elevator is stopped or running. It is an object of the present invention to provide a mischievous rocking alarm method and device capable of effectively preventing rocking and a governor malfunction accident.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is configured as follows, focusing on that it is necessary to determine a reference value for mischievous swing determination from the viewpoint of the traveling speed of the elevator in addition to the vibration acceleration. .

That is, in terms of the method, when any one of the acceleration and the speed equivalent value of the car exceeds a reference value, an alarm is generated as if the car has been mischievously rocked,
In addition, among the above reference values, the acceleration reference value is set smaller than the vibration resistance acceleration for operating the governor, and the speed reference value is set smaller than the speed for operating the governor.

Further, as a basic device, it is provided with means for issuing an alarm when either the acceleration or the speed equivalent value of the car exceeds a reference value, and the reference value of the acceleration among the reference values is a vibration-proof acceleration for operating the governor. We propose a hydraulic elevator system in which the speed reference value is set smaller than the speed at which the governor is operated.

The above-mentioned method and apparatus for tampering with tampering with an elevator, in addition to generating the alarm when any one of the detected values of the acceleration and the velocity exceeds the respective reference value, causes the car to move to the nearest floor. It may be controlled so that the door is stopped and the door is opened, and a means for automatically returning the elevator to a normal state by the opening operation of the door may be added.

[Action]

With such a configuration, an alarm is issued when the acceleration and the speed exceed any _one of the acceleration reference value g ₁ and the speed reference value V ₁ while the elevator is operating (stopping or traveling).

For example, if the car is mischievous rocking while the elevator is stopped, and this rocking gradually increases, in this case, the acceleration exceeds the acceleration reference value g ₁ before the speed reference value V ₁ , and this g ₁ is exceeded. An alarm is issued when the time is exceeded.

Further, if a mischievous rocking occurs while the elevator is traveling at the rated speed, in this case, even if the rocking (acceleration) is smaller than the acceleration reference value g ₁ , the elevator running speed is caused by the rocking. often value of the variation exceeds the speed reference value V _1, an alarm is issued when the speed fluctuation value exceeds a speed reference value V _1.

During acceleration / deceleration of the elevator, the speed of the elevator reaches the corresponding reference value V ₁ before the acceleration, or the acceleration reaches the corresponding reference value g ₁ before the speed,
Since it varies depending on the situation, an alarm is issued when either the speed or the acceleration becomes larger than either of the reference values V ₁ and g _{1 first} .

As described above, the present invention issues an alarm when the detected values of speed and acceleration exceed either of the reference values V ₁ and g ₁ . Therefore, even if the elevator traveling speed approaches the governor operating point V ₃ at an acceleration (car swing) smaller than the acceleration reference value g ₁ during elevator traveling, the presence of the speed reference value V ₁ causes the governor to move. An alarm can be issued before activation to prevent tampering swings. Therefore, even when the elevator is stopped or running, the mischievous swing of the elevator car is accurately detected, and an alarm is issued before the governor is activated to prompt the discontinuation of the mischievous swing. . As a result, it is possible to prevent ineffective tampering swing and prevent malfunction of the governor.

Further, if a tampering swing is detected, in addition to an alarm, if the car is stopped at the nearest floor, the door is opened, and then the elevator is returned to a normal state, the tampering swing is forced. Therefore, the effect of preventing mischievous swing and the effect of preventing malfunction of the governor can be achieved.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

1 and 2 are system configuration diagrams of an elevator which is an embodiment of the present invention, and FIG. 3 is an operation explanatory diagram thereof.

The elevator of this embodiment is a hydraulic type, and in FIG.
Is a car, 2 is a guide roller, 3 is a rail, 4 is a pulley, 5 is a hydraulic cylinder, 6 is a plunger, 7 is hydraulic oil,
8 is a rope.

The hydraulic pressure of the cylinder 5 is controlled by the hydraulic control valve 9 supplying and discharging the hydraulic oil 7, and the hydraulic control causes the plunger 6 to move up and down. The pulley 4 is attached to the upper end of the plunger 6, and when the plunger 6 moves up and down, the pulley 4 and the rope 8
The car 1 moves up and down along the rail 3 via.

Reference numeral 10 is an oil pump, and 11 is a motor for driving the oil pump.

Reference numeral 12 is a rotary encoder (pulse generator) interlocking with the car, 13 is an arithmetic and control unit for driving and controlling the elevator, and 14 is a control command unit for giving various operation commands to the elevator. The rotary encoder 12 serves as means for detecting the acceleration and speed of the elevator car.

In addition to performing various calculations necessary for elevator operation, the arithmetic and control unit 13 inputs a pulse signal from the rotary encoder 12, counts pulses per unit time, and performs differential calculation to determine the traveling speed and acceleration of the elevator. It has a circuit for calculating and a circuit for comparing the calculated values (detected values) of the traveling speed and the acceleration with a predetermined reference value to judge the mischievous swing of the car. The operation of the alarm device 15 is controlled by the output of this determination circuit. That is, the alarm device 15 and the arithmetic and control unit 13 constitute a means for issuing an alarm when either the acceleration or the speed equivalent value of the car exceeds the reference value. Among the reference values determined by the arithmetic and control unit 13, the acceleration reference value g ₁ is set to be larger than the normal acceleration g ₂ that occurs when a passenger or the like gets in when the elevator is stopped and smaller than the vibration resistance acceleration g ₃ that operates the governor. (G ₂ <g ₁ <
g ₃ ), on the other hand, the reference value V _{1 of the} speed is set to be larger than the rated speed V ₂ during traveling of the elevator and smaller than the speed V ₃ for operating the governor switch (V ₂ <V ₁ <V ₃ ).

The governor system of this embodiment is shown in FIG. 2, and 16 is a car 1
A lever for activating an emergency stop device (not shown) mounted on the vehicle, 17 is a governor rope, and 18 is a governor.

Next, the operation of this embodiment will be described.

During operation of the elevator, the rotary encoder 12 generates a pulse according to the movement of the car 1, and the arithmetic and control unit 1
Sent to 3.

The arithmetic and control unit 13 counts this pulse number or performs a differential operation to calculate the velocity and the acceleration.

If any of the speed detection value and the acceleration detection value is equal to or more than the reference value g ₁ or V ₁ , it is determined that there is a mischievous swing. When this determination is made, an operation command is issued to the alarm device 15 and an alarm sound is emitted, and at the same time, the control command device 14 issues a command to stop the car 1 to the nearest floor and open the door. After that, when the door is closed, the elevator is returned to the normal operation mode.

For example, mischievous rocking occurs in the car 1 ride in the elevator is stopped, when the swing is gradually increased, in this case, generally the reference velocity V ₁ before the acceleration is more acceleration reference value g ₁
Therefore, an alarm is issued when g ₁ is exceeded. That is, when the acceleration detection value is a normal acceleration g ₂ level or more that occurs when a passenger gets in, the vibration resistance acceleration g of the governor
_An alarm is issued before reaching ₃ .

Further, if the mischievous swing occurs while the elevator is traveling at the rated speed, in this case, the rated speed V ₂ is multiplied by the acceleration g as shown in FIG. 3, and the acceleration g reaches a certain level. , The fluctuation value of the elevator traveling speed often exceeds the speed reference value V ₁ due to the fluctuation even if the fluctuation (acceleration) is smaller than the reference value g _1. When the value exceeds the speed reference value V ₁ , an alarm is issued. That is, in this case, as shown in FIG. _3, an alarm is issued when the speed detection value reaches a predetermined level between the rated speed V ₂ and the governor operating speed V ₃ .

During acceleration / deceleration of the elevator, the speed of the elevator reaches the corresponding reference value V ₁ before the acceleration, or the acceleration reaches the corresponding reference value g ₁ before the speed,
Since it varies depending on the situation, an alarm is issued when either the speed or the acceleration becomes larger than either of the reference values V ₁ and g ₁ .

Therefore, according to the present embodiment, since the mischievous swing of the car is monitored by two sets of the speed reference value and the acceleration reference value, the mischievous swing can be accurately detected both when the elevator is stopped and when the elevator is running. Then, an alarm can be issued before the governor is activated, and the elevator can be stopped at the nearest floor. Therefore, it is possible to prevent mischievous rocking and extremely effectively prevent malfunction of the governor.

In the above embodiment, the alarm is issued immediately when any of the detected values of the acceleration and speed of the car reaches either of the corresponding reference values g ₁ and V ₁ , but instead of this, the acceleration And any one of the detected values of the speed intermittently exceeds the corresponding reference values g ₁ and V ₁ within a predetermined time, that is, one of the detected values of the acceleration and the speed corresponds to the reference value within the predetermined time. An alarm may be issued when g ₁ and V ₁ are intermittently exceeded a predetermined number of times. In this case, it is necessary that the detected values of acceleration and speed intermittently exceed the reference values g ₁ and V ₁ levels without exceeding the governor vibration-proof acceleration g ₃ and the governor operating speed V ₃ , which is g ₁ , V ₁
The level may be lowered within the range of g ₂ to g ₃ or V _{2 to} V ₃ .

〔The invention's effect〕

As described above, according to the present invention, irrespective of whether the elevator is stopped or running, the car is always properly detected for mischievous rocking and an alarm is issued to prevent mischievous rocking and malfunction of the governor. It can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention, and FIG.
FIG. 4 is a block diagram showing the governor system of the above embodiment, FIG. 3 is an operation explanatory view of the above embodiment, and FIG. 4 is an operation explanatory view for explaining problems in the conventional elevator. DESCRIPTION OF SYMBOLS 1 ... Car, 12 ... Acceleration / speed detection means (rotary encoder), 13 ... Mischievous swing determination means (arithmetic control device), 15 ... Alarm device, 18 ... Governor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Yoneda Kenji Yoneda 1070 Imo, Katsuta-shi, Ibaraki Hitachi Co., Ltd. Mito Plant (72) Inventor Katsutaro Masuda 1070 Ichimo, Katsuta-shi, Ibaraki Hitachi Ltd. Mito Plant Within

Claims (5)

[Claims] 1. A means for issuing an alarm when any of the acceleration and speed equivalent values of a car exceeds a reference value, and the reference value of acceleration among the reference values is smaller than the vibration-resistant acceleration for operating a governor, A hydraulic elevator device characterized in that the reference value of speed is set to be smaller than the speed at which the governor is operated. 2. A means for detecting the acceleration and speed of a car and comparing the detected values of the acceleration and speed with respective reference values, and when any one of these detected values exceeds the reference value, an alarm is issued. The acceleration reference value g ₁ of the reference values is larger than the normal acceleration g ₂ that occurs when passengers, luggage, etc. are on board while the elevator is stopped, and the vibration-resistant acceleration g ₃ that operates the governor. On the other hand, the speed reference value V ₁ is larger than the rated speed V ₂ during elevator traveling, and the speed V ₃ for operating the governor is smaller than
A hydraulic elevator device characterized by being set smaller than 3. A means for detecting the acceleration and speed of a car, a means for issuing an alarm when any of the detected values of the acceleration and speed exceeds a reference value, and the above-mentioned ride when the detected value exceeds the reference value. And a control means for returning the elevator to the normal state after stopping the car at the nearest floor and opening the door,
In addition, the acceleration reference value g ₁ of the above reference values is set to be larger than the normal acceleration g ₂ that occurs when passengers and luggage are stopped while the elevator is stopped, and smaller than the vibration resistance acceleration g ₃ that operates the governor. , Speed reference value V
₁ is larger than the rated speed V ₂ during elevator traveling,
A hydraulic elevator device, wherein the speed is set to be lower than a speed V ₃ for operating the governor. 4. The hydraulic elevator apparatus according to claim 2, wherein the means for detecting the acceleration and the speed of the car comprises an encoder for generating pulses in conjunction with the car. 5. When any one of the acceleration and the speed equivalent value of the car exceeds a reference value, an alarm is generated as if the car has undergone a mischievous swing, and an acceleration of the reference value is calculated. Is set to be smaller than the vibration resistant acceleration for operating the governor, and the reference value for speed is set to be smaller than the speed for operating the governor.