JPH0637271B2 - Safety control device for hydraulic elevator - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a safety control device at the time of abnormality of a hydraulic elevator.

[Technical background of the invention]

Generally, in hydraulic elevators, there are a direct type in which a hydraulic jack is located directly below a car to raise and lower the car directly, and an indirect type in which a hydraulic jack moves the car up and down via a sheave and rope.

FIG. 3 shows a schematic configuration of the above-mentioned direct hydraulic elevator. A power unit 3 which is a drive source of the hydraulic elevator is arranged in a machine room 2 adjacent to the hoistway 1, and a pressure oil generated from the power unit 3 is arranged. A hydraulic jack 5 for feeding the oil through a pipe 4 is erected in the hoistway 1, and a basket 8 is supported on an upper end of a plunger 7 slidably fitted in a cylinder 6 of the hydraulic jack 5. The car 8 is guided up and down by sliding a guide device 10 such as a guide shoe on the left and right guide rails 9 provided on the inner wall of the hoistway 1.

The power unit 3 includes the oil tank 11 and the electric motor 1.
2 and a hydraulic pump 13 driven by the electric motor 12
And a flow control valve 14 and the like.

When the electric motor 12 of the power unit 3 is driven, the hydraulic pump 13 sucks the oil in the oil tank 11 and discharges it as pressure oil, and the pressure oil is flow-controlled by the flow control valve 14 while the hydraulic pressure is supplied via the pipe 4. It is sent into the cylinder 6 of the jack 5, and the plunger 7 pushes up the car 8 and moves up. On the other hand, when descending, the weight of the car 8 causes the pressure oil in the cylinder 6 of the hydraulic jack 5 to be controlled by the flow control valve 14 via the pipe 4 while the oil tank 1 is being controlled.
It is returned to 1, so that the plunger 7 moves down together with the car 8. That is, the pressure oil is supplied from the hydraulic pump 13 to the flow control valve 14
By being sent to the cylinder of the hydraulic plunger 5 through the pipe 4 while being controlled by the flow rate, or conversely being returned to the oil tank while being controlled by the flow rate control valve 14 from the cylinder 6 through the pipe 4, The car 8 comes to move up and down according to a predetermined traveling pattern.

Further, the power unit 3 which is the heart portion for driving the hydraulic elevator as described above will be described in more detail with reference to the hydraulic circuit diagram of FIG. 4. The flow control valve 14 of the power unit 3 is discharged from the oil tank 11 by the hydraulic pump 13. The check valve 15 through which the pressurized oil passes, the check valve 16 and the normally closed valve 18 under the control of the descending control circuit 17, which are connected in parallel to each other so as to communicate with the pipe 4, and in the opposite direction. It is composed of a normally open valve 21 under the control of an ascending control circuit 20 provided in a return pipe 19 that branches to communicate with the oil tank 11.

When the hydraulic pump 13 is driven by the electric motor 12 and the normally open valve 21 is closed by the raising control circuit 20 of the flow rate control valve 14, the pressure oil discharged from the hydraulic pump 13 passes through the check valves 15 and 16. It is supplied from the pipe 4 to the cylinder 6 of the hydraulic jack 5 to raise the car 8. When lowering the raised car 8, the hydraulic pump 13
The normally open valve 21 of the ascending control circuit 20 of the flow rate control valve 14 is returned to the open state while the above is stopped, and the normally closed valve 18 of the descending control circuit 17 is opened in this state. By doing so, the pressure oil in the cylinder 6 of the hydraulic jack 5 is pushed out to the pipe 4 by the load of the car 8 and returns to the oil tank 11 through the return pipe 19 through the normally closed valve 18 and the normally open valve 21. Then, the plunger 7 comes down with the car 8.

By the way, the power unit 3 of such hydraulic elevator
Then, the flow control valve 14 is provided with the safety valve 22, and when the hydraulic pressure rises abnormally when the car 8 is driven upward, the high pressure oil is returned to the oil tank 11 to limit the hydraulic pressure rise to ensure safety. It is like this. In other words, when the car 8 is in the ascending operation, for example, when a load higher than the rated load is applied to the car 8 or while the car 8 is running, it is caught by a protrusion or the like in the hoistway 1 and the smooth movement is possible. When it is no longer possible or when the check valve 15 or the like fails, the hydraulic pressure in the hydraulic circuit rises abnormally.
In that case, the safety valve 22 operates to return the high pressure oil to the oil tank 11 to prevent an abnormal increase in the hydraulic pressure in the hydraulic circuit,
It is designed to prevent damage to hydraulic equipment.

Although not shown, the power unit of the indirect hydraulic elevator is the same as that of the direct elevator.

[Problems of background technology]

The conventional hydraulic elevator described above has the following problems. In other words, as described above, when the hydraulic pressure in the hydraulic circuit rises due to being caught by a protrusion or the like in the hoistway 1 while the car 8 is traveling, the safety valve 22 operates,
Although the hydraulic pressure in the hydraulic circuit is prevented from rising above the set value of the safety valve 22, the electric motor 1 continues to rotate in the overload state, which results in loss of electric power and heating / burning. There was a problem that led to a failure or accident.

Further, the safety valve 22 does not operate for some reason, the hydraulic pressure in the hydraulic circuit rises abnormally, and the hydraulic equipment may be damaged.

Therefore, when the oil pressure of the power unit 3 rises abnormally, the applicant immediately stops the electric motor 12 driving the hydraulic pump 13 to stop the traveling of the car, thereby causing the loss of electric power and the heating of the electric motor as described above.・ It is designed to prevent burnout and failure or accidents due to it, and to prevent further hydraulic pressure rise even if the safety valve 22 of the flow control valve does not operate, to prevent damage to hydraulic equipment, etc. Has proceeded with development.

However, if the elevator operation is immediately stopped and the car 8 is stopped on the spot when such an abnormal increase in hydraulic pressure occurs, the car 8 can be prevented from being seriously injured, such as destruction of the car 8 and personal injury, in addition to the above-described effects. There is a problem that passengers are trapped inside the car 8 and cannot escape outside, which is a so-called "cull condition", and in such a recent social situation, such a claw accident causes a great deal of human unrest. There is a problem that the economic and time loss suffered by the passengers who are trapped is very great.

[Object of the Invention]

The present invention has been made in view of the above-mentioned circumstances. First, when an abnormal increase in the hydraulic pressure in the hydraulic circuit of the power unit occurs,
Provide a very safe and simple safety control device for a hydraulic elevator that can safely stop the elevator after the car has been guided to the nearest floor and stop the operation of the car, and can quickly blame passengers outside Secondly, in addition to the above-mentioned first purpose, when the abnormal hydraulic pressure rise is excessive (when the hydraulic pressure rises excessively), it is possible to prevent a serious accident such as car destruction which is more dangerous than a crash accident. Therefore, it is an object of the present invention to provide a safety control device for an elevator with extremely high safety, which can immediately stop the elevator operation and stop the car on the spot.

[Outline of Invention]

The first elevator safety control device of the present invention is provided with a pressure detector for detecting an abnormal rise in the hydraulic pressure of the hydraulic circuit of the power unit, and lowers the car by the hydraulic pressure abnormality detection output signal of the pressure detector. A control circuit is installed to stop the elevator operation after landing on the nearest floor, and when an abnormal rise in the hydraulic pressure in the hydraulic circuit is detected, the control circuit does not stop the car on the spot to reach the nearest floor while descending. It is designed to be stopped on the floor.

The second elevator safety control device of the present invention is
When an abnormal rise in the hydraulic pressure of the hydraulic circuit of the power unit is detected, the elevator operation is stopped after landing on the nearest floor while lowering the car in the same manner as above, but when the hydraulic pressure of the hydraulic circuit rises excessively abnormally. Is a system in which the elevator operation is immediately stopped due to the detection of a hydraulic abnormality and the car is stopped on the spot regardless of its position.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. It should be noted that, in the drawings, the same components as those shown in FIGS. 3 and 4 are designated by the same reference numerals to simplify the description.

Here, the pressure detector 23 is attached to the pipe 4 arranged to connect the power unit 3 and the hydraulic jack 5 to each other so that the hydraulic pressure acting on the inside of the cylinder 6 of the hydraulic jack 5 from the hydraulic circuit of the power unit 3 is detected. An abnormal rise is detected. The pressure detector 23 uses a hydraulic pressure gauge with an electric contact or the like. When the hydraulic pressure exceeds a preset set value, the electric contact operates and outputs an electric signal. An abnormality detection signal when the degree of abnormal rise in hydraulic pressure is relatively low, and a super abnormality detection signal when the degree of abnormal rise in hydraulic pressure is excessive (when the hydraulic pressure is abnormally high) Is output. In other words, the hydraulic pressure is 120
When it exceeds%, the first stage abnormality detection output signal is output, and when it reaches 150% of the rated pressure, the second stage super abnormality detection output signal is output. The reason for setting the two-stage pressure setting values to 120% and 150% of the rated pressure is that the safety valve 22 starts operating before the hydraulic pressure when the car rises does not exceed 120% of the normal pressure (rated pressure) according to the regulations. In addition, it corresponds to the obligation to set it so that it does not exceed 150% at the maximum.

Further, a position detector 24A is provided below the car 8 in the hoistway 1 so as to move together with the car 8, and a position detector 24B is provided by fixing one to each floor of the building. Then, when the car 8 arrives at the landing position on each floor, the position detector 24A of the car 8 faces the position detector 24B of the floor in close proximity and outputs a position detection signal.

As shown in FIG. 2, a control circuit 25 for performing elevator operation control based on the detection output signals of the pressure detector 23 and the position detectors 24A and 24B is provided. The structure of the control circuit 25 will be described. For the P and N power supplies, the first-stage electrical contact E1 of the pressure detector 23 and the electrical contact E
A relay RS that is excited by closing 1 is connected, and a contact RS1 that is closed in parallel with the power sources P and N by the excitation of the relay RS and its contact RS.
1 is connected to a relay D that is excited when it is closed, and the relay D is interlocked with a descending switching circuit unit 26 that issues a descending operation command to the descending control circuit 17 of the flow control valve 14 of the power unit 3. . Further, in parallel with them, a normally closed contact D1 which is opened by exciting the relay D with respect to the power sources P and N, a second-stage normally closed electrical contact E2 of the pressure detector 23, and its contacts D1 and E2. Is connected to a switch MC that shuts off the power supply to the electric motor 12, and further, to the power supplies P and N, another contact D2 of the relay D and the position detectors 24A and 2 are connected.
4B is connected to a position detecting contact point F which is closed when the contact point 4B and 4B are closely opposed to each other, and a relay C which is excited by closing the contact points D2 and F is connected. The other electrical contact E3 of the stage is connected to the power source P in parallel with each other, and is connected to the elevator stop circuit section ST which stops the elevator operation when either one of them is closed via these contacts C1 and E3. .

Therefore, in the safety control device for the hydraulic elevator described above,
If the car 8 is hindered from smoothly moving up and down for some reason, the following control is performed. For example, when the elevator 8 is in the ascending operation, foreign matter is caught between the guide rail 9 and the guide device 10 and the traveling of the car 8 is disturbed, and the hydraulic pressure of the hydraulic circuit rises abnormally. To detect.

At this time, the oil pressure is 120% of the rated pressure depending on the degree of foreign matter.
In some cases, it may exceed 100% or may become extremely high, such as 150%.
Therefore, when the hydraulic pressure is extremely abnormally increased to reach 150%, it is a very dangerous state that may lead to a serious accident that may lead to the destruction of the guide device 10, the car 8 and the like, so it is necessary to immediately stop the elevator operation. . However, in the case of an abnormally high pressure of about 120% or less, since there is some time to run the car 8, the elevator is unnecessarily stopped suddenly to give passengers a shock or anxiety, and the passengers can be disturbed. It is better to avoid trapping in a state. Therefore, safety control is performed in consideration of these matters.

In other words, first, when the hydraulic pressure exceeds 120% of the rated pressure,
Do not stop the car 8 suddenly, continue driving and land on the nearest floor, then stop. However, if the raising operation of the car 8 is continued when an abnormal pressure is generated, there is a risk that the hydraulic pressure further rises. In that case, the electric motor 12 should be stopped and the lowering operation should be performed to land on the nearest floor. To do. Also the hydraulic pressure is 1
At the time of a super abnormal rise of as much as 50%, the danger is great, so it is unavoidable that it may cause an accident, so the elevator operation is stopped immediately and the car 8 is stopped in that case.

That is, in FIGS. 1 and 2, the hydraulic pressure is equal to the rated pressure 1
When it exceeds 20%, the pressure detector 23 operates to detect and output an oil pressure abnormality detection output signal. That is, the contact E1 of the first stage is closed. This excites the relay RS and its contact RS
1 closes and excites the relay D that works in conjunction with the descending switching circuit unit 26. The contact D1 is immediately opened by the excitation of the relay D, the switch MC is cut off, the power supply to the electric motor 12 is stopped, and the electric motor 12 is stopped. At the same time, a command to switch from the ascending control circuit 20 of the flow rate control valve 14 of the power unit 3 to the descending control circuit 17 is issued by the descending switching circuit section 26 that interlocks with the relay D, and the normally closed valve 18 is closed. Is opened, the normally open valve 21 is returned to the open state, and the descending operation state is set. At the same time, the other contact D2 of the relay D closes. In such a state, the car 8 is lowered while the electric motor 12 is stopped.

Thus, when the car 8 comes to a position where it comes to the nearest nearest floor below the point when the hydraulic pressure abnormally rises, the position detector 24A of the car 8 causes the position detector 2 of the nearest floor on the building side.
The position detection contact F is closed by closely facing 4B. By closing both the position detecting contact F and the contact D2, the relay C is excited and the contact C1 is closed, so that the elevator stop circuit ST is energized.
The stop circuit portion ST works to completely stop the elevator operation, and the car 8 is landed on the nearest floor and stopped.

To briefly describe the elevator safety control once again, when the hydraulic pressure in the hydraulic circuit exceeds 120% of the rated pressure, the electric motor 12 is first stopped to prevent danger, and the hydraulic pressure in the hydraulic circuit is reduced. Next, the mode is switched to elevator descent operation, the car 8 is lowered until it comes to the nearest floor, and when the position detection contact F is closed, the stop circuit unit ST operates,
The car 8 is landed on the nearest floor and the elevator operation is completely stopped.

Next, when the hydraulic pressure of the hydraulic circuit rises to 150% of the rated pressure, it is considered to be a very dangerous state that causes a serious accident such as damage as described above. Even if there is, stop immediately on the spot. That is, when the hydraulic pressure reaches 150% of the rated pressure, the pressure detector 23 outputs a super abnormal rise detection signal, that is, the second
The normally closed contact E2 of the second stage is opened to shut off the switch MC and stop the motor 12, and at the same time, the other contact E of the second stage is closed.
3 is closed and the elevator stop circuit ST is activated,
Immediately completely stop elevator operation to immediately stop the car 8 in place.

〔The invention's effect〕

Since the present invention has been made as described above, in the first invention, when the hydraulic pressure in the hydraulic circuit of the power unit is abnormally increased, the car can be safely guided and landed on the nearest floor, and then the elevator operation can be stopped to prevent a possible accident. It becomes a very complete and simple safety control device for a hydraulic elevator that can promptly denounce passengers to the outside.

Further, in the second invention, in addition to the effect of the first invention, when the degree of abnormal increase in hydraulic pressure is excessive (at the time of excessive increase in hydraulic pressure),
This is a very safe elevator safety control device that can immediately stop the elevator operation and stop the car on the spot in order to prevent a serious accident such as car destruction that is more dangerous than a crash accident.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a front view of a hydraulic elevator in which a safety control device of the present invention is assembled, FIG. 2 is an electric control circuit diagram, FIG. 3 is a schematic configuration diagram of a general hydraulic elevator, and FIG. 3 is a hydraulic circuit diagram of FIG. 1 ... hoistway, 2 ... machine room, 3 ... power unit,
4 ... Piping, 5 ... Hydraulic jack, 6 ... Cylinder, 7
…… Plunger, 8 …… Cage, 9 …… Guide rail, 1
0 ... Guide device, 11 ... Oil tank, 12 ... Electric motor,
13 ... Hydraulic pump, 14 ... Flow control valve, 15, 16
...... Check valve, 17 ...... Descent control circuit, 18 ...... Normally closed valve, 19 ...... Return pipe, 20 ...... Rise control circuit, 21 ...
… Normally open valve, 22 …… Safety valve, 23 …… Pressure sensor, E
1, E2, E3 ... Electric contact, 24A, 24B ... Position detector, F ... Position detection contact, 25 ... Control circuit, 26
...... Descent switching circuit section, MC ...... Switch for motor power supply,
ST ... Elevator stop circuit section, RS, D, C ... Relay, RS1, D1, D2, C1 ... Contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneharu Yamada 2-38 Yokobori, Higashi-ku, Osaka City, Osaka Prefecture Nikken Sekkei Co., Ltd. Fuchu Factory (72) Inventor Kunio Yasuda No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu Factory

Claims (2)

[Claims] 1. A car is moved up and down by sending pressure oil from a power unit oil tank to a hydraulic jack via a flow control valve by operating a hydraulic pump, or conversely returning pressure oil in the hydraulic jack to the oil tank. In the hydraulic elevator, the pressure detector that detects an abnormal increase in the hydraulic pressure of the hydraulic circuit of the power unit is provided, and the car is landed at the nearest floor while the car is descending according to the hydraulic pressure abnormal detection output signal of the pressure detector. A safety control device for a hydraulic elevator, comprising a control circuit for stopping the elevator operation after the start. 2. Raising and lowering the car by sending pressure oil from the oil tank of the power unit to the hydraulic jack via the flow control valve by the operation of the hydraulic pump, or conversely returning the pressure oil in the hydraulic jack to the oil tank. In the hydraulic elevator, the pressure detector that detects an abnormal increase in the hydraulic pressure of the hydraulic circuit of the power unit is provided, and the car is landed at the nearest floor while the car is descending according to the hydraulic pressure abnormal detection output signal of the pressure detector. The hydraulic pressure is characterized in that a control circuit is provided to stop the elevator operation after that, and to immediately stop the elevator operation immediately by the hydraulic pressure abnormality detection output signal of the pressure detector regardless of the position of the car. Elevator safety control device.