JPH0356375A - Control device for fluid pressure elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for a hydraulic elevator, and in particular, to a control device for reducing the floating or sinking of an elevator car when passengers board or exit the elevator. The present invention relates to a control device for a hydraulic elevator suitable for use in controlling a hydraulic elevator.

[Prior Art] Generally, elevators using fluid (in the following explanation,
(which uses oil as the fluid) drives the electric motor and pump to supply pressurized oil to the cylinder when rising,
During descent, the electric motor and pump are not driven, and pressure oil is discharged from the cylinder.

This pressure oil changes depending on the load (carrying capacity) of the car.
It changes its volume (much due to the gases contained within the fluid), which affects the landing error of the elevator car.

As a prior art related to a control device for a fluid pressure elevator that reduces such a landing error, for example, Japanese Patent Laid-Open No. 49
Techniques described in JP-A-77333, JP-A-49-108749, etc. are known.

The prior art described in the above publication detects the floating or sinking of the car when a passenger gets on or off the car, and supplies pressure oil into the cylinder using an accumulator, or , which discharges pressure oil from the cylinder.

In addition, as another conventional technology, when the landing error of the car exceeds a predetermined value, if the error is sinking of the car, the electric motor constituting the fluid pressure source is driven, and the A method has been proposed in which the landing error is corrected at a minute speed by supplying pressure oil into the cylinder.

[Problems to be Solved by the Invention] The conventional technology using the accumulator has the problem that the device is large and expensive.

In addition, the conventional technology using the electric motor detects a landing error of the car, and if the error is due to sinking of the car, then the electric motor is driven to supply pressure oil to the cylinder. However, due to the delay in the start-up time of the electric motor, the car sinks further, causing great discomfort to the passengers.

The purpose of the present invention is to solve the problems of the prior art described above,
To provide a control device for a hydraulic elevator that has an inexpensive configuration, safely reduces the amount of sinking of a car without delay in starting an electric motor, and does not cause discomfort to passengers.

[Means for Solving the Problem] According to the present invention, the object is to provide a means for detecting the load amount in the car, and a means for detecting a change in the load amount of the elevator car at the next floor after starting the elevator car. and a means for predicting whether the car will float or sink, and if sinking is predicted, after the car has landed on the ground, a means for supplying pressure fluid is activated to prepare for the sinking of the car. This can be achieved by making sure that

Furthermore, in order to make the control more precise and to improve safety, the means for supplying the pressure fluid is configured using a two-speed electric motor, and the sinking of the car is predicted. The means for supplying pressure fluid is activated by starting the low-speed electric motor when the vehicle is running, and a door zone signal and an inching permission zone are provided so that the low-speed electric motor is activated only within this zone. .

[Function] As already mentioned, pressure oil reduces the load (loading capacity) of the car.
The change in volume causes the volume to change, which affects the landing error of the car.

Therefore, when starting the elevator or while it is running,
By detecting the load inside the car, it is possible to predict whether the car will sink or rise if the car stops at the next floor. Based on this prediction, if the elevator car is predicted to sink when stopped at the next floor, the present invention drives the low-speed side of the two-speed motor at the same time as the elevator car lands and the door opens. , be prepared for the car to sink. As a result, the pressure of the pressure oil can be increased so that it can be supplied into the cylinder at any time, thereby avoiding the problem of a delay in starting the electric motor and making it possible to cope with the sinking of the car.

A two-speed motor is used as the electric motor constituting the fluid pressure source, and the low speed side is used for inching operation to cope with the sinking of the car.
It is necessary to perform this at a slow speed, and this is to enable more accurate use of the flow control valve used during normal operation. In addition, by using the low speed side of the electric motor, even if some abnormality occurs in the flow control valve during inching operation and all of the pressure oil is supplied into the cylinder, the electric motor will continue to rotate at low speed. Therefore, it is possible to prevent a serious failure from occurring.

In general, from the passenger's perspective, the sinking of the car is more likely to be a problem than the floating of the car, and even if the electric motor is started after sinking is detected, it will not be possible to completely prevent the car from sinking. As described above, the invention can prepare for the sinking of the car by starting the electric motor in advance, so that if the car sinks, it can be dealt with without delay.

[Example 1] Hereinafter, an example of a control device for a hydraulic elevator according to the present invention will be described in detail with reference to the drawings.

Fig. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, Fig. 2 is a flowchart explaining the operation of predicting the ups and downs of the car, Fig. 3 is a flowchart explaining the operation of inching operation, and Fig. 4 The figure is a time chart illustrating the overall operation of an embodiment of the present invention, and FIG. 5 is a diagram illustrating a method for determining the loading capacity of a car from the pressure of fluid. In Fig. 1, 1 is a car, 2 is a hydraulic ram, 2a is a plunger, 3 is a booley, 4 is a rope, 5 is a spring, and 6
is a flow rate control valve, 7 is a fluid pressure source, 8 is a two-stage speed motor, 8
a is a low-speed side electric motor, 8b is a high-speed side electric motor, 10 is a control device, J2 is a speed detector, 13 to 15 are contactors, 17
a, 17b are inching zone detectors, 18 is a door zone detector, and 20 is a fluid pressure detector.

One embodiment of the present invention shown in FIG. 1 includes a pulley 3 provided at the top of a plunger 2a of a hydraulic ram 2, a rope 4 hung on the pulley 3, a spring 5 fixing one end of the rope 4, and a rope The car 1 is connected to the other end of the car 4, and the car 1 is driven by driving the plunger 2a. The plunger 2a is controlled by pressure oil from a fluid pressure source 7 to which pressure is applied by a two-speed electric motor 8 being injected into and discharged from the fluid pressure ram 2 under the control of a flow rate control valve 6.

The control device 10 is configured with a microcomputer, and detects the displacement or speed of the car 1.
It receives a detection signal from a speed detector 12 such as a rotary encoder or a generator, and a signal from a fluid pressure detector 20 that detects the pressure of pressure oil with respect to the fluid pressure ram 2.
The operation of the elevator car 1 is controlled in response to calls by inputting and outputting various signals inside the tower and controlling the fluid control valve based on the results.

The signal of the fluid pressure detector 20 is returned to the control device ↓0,
It is used for the above-mentioned operation control, and at the same time serves as a signal for determining the loading capacity of the car 1, as will be described later. Further, the fluid pressure source 7, which is usually constituted by a pump, is connected to a two-stage speed electric motor 8, and uses its power to apply pressure to the fluid.

The two-speed motor 8 includes, for example, a high-speed motor 8a and a low-speed motor 8b having a four-pole configuration, and the high-speed motor 8a is connected to a low-speed motor that performs inching operation via the contact point of the contactor l3. The electric motor 8b is connected to the control device via a series connection of the contactor 14 and the constant contacts of the contactor 15 representing the door zone and the inching saw.

A door zone detector 18 and inching zone detectors 17a and 17b are provided at the top of the car 1, and these detectors are magnetically coupled to a shielding plate 16 provided in the tower. Detect each zone.

The fluid pressure elevator configured as described above drives the electric motor 8, uses its rotational force to drive the fluid pressure source 7, and injects pressurized fluid into the fluid pressure ram 2 through the flow control valve 6. By doing so, the car 1 is operated at the 2nd level. On the other hand, when driving the car 1 downward, the electric motor 8 is not driven;
The flow rate control valve 6 only controls the flow rate of the pressure fluid, and the car is lowered by its own weight.

Now, as mentioned above, the hydraulic elevator has the drawback that when the car is stopped with the door open, when passengers get on and off, the volume of the fluid changes and the car rises and falls.

This ups and downs of the car can be suppressed to a level that does not pose a practical problem by promptly controlling the flow rate of the fluid.

Therefore, in the embodiment of the present invention, when the elevator is started, the load amount in the car is detected based on the detection signal of the fluid pressure detector 20, and when the elevator stops at the next floor while the elevator is running. This system predicts the ups and downs of the car 1 and prepares for the ups and downs of the car. Thereby, if the car 1 actually floats or sinks, it is possible to take immediate action.

The control for preventing floating of a car according to an embodiment of the present invention will be explained below. First, with reference to the flow shown in FIG. The operation of predicting the ups and downs of the car as passengers get on and off will be explained.

(1) The pressure of the pressurized fluid immediately before the elevator starts is detected and stored by the fluid pressure detector 20, and the loading amount in the car 1 is estimated from the detected pressure (steps 21, 22).

(2) When the elevator starts running, step 22
Determine whether the estimated loading capacity of the car is a predetermined value, for example, 70% or more of the rated loading capacity (
Steps 23, 24).

(3) If the loading capacity is determined to be 70% or more in step 24, after the car stops at the next floor and the door is opened,
It is determined that there is a high possibility that the car will levitate (step 25).

(4) If it is determined in step 24 that the loaded amount is 70% or less, it is checked whether the loaded amount is 30% or less (step 26).

(5) If the loading capacity is determined to be 30% or less in step 26, after the car stops at the next floor and the door is opened,
It is determined that there is a high possibility that the car will sink, and preparations for the sinking of the car are made, that is, the low speed motor 8a of the two-speed motor 8 is started to increase the pressure of the fluid from the fluid pressure source 7. , ready to inject fluid into the hydraulic ram 2 at any time (steps 27, 28). ,(6
) After the completion of steps 25, 28 and step 26
If the load capacity is determined to be between 30% and 70% (in this case, the car neither rises nor sinks), the car stops, and after the door is opened, the flow rate increases depending on the rise and fall of the car. The control valve is controlled (step 29) In the above, when the car's loading capacity is 70% or more of the rating, it is determined that the car will float because there is a high possibility that passengers will get off at the next floor. Furthermore, the reason why it was determined that the car would sink if the car's loading capacity was 30% or more of the rated value was that there was a high possibility that passengers would board the car on the next floor.

The predetermined values of the 70% and 30% loading amounts that serve as the basis for this determination may be arbitrary values that can be obtained empirically.

Furthermore, it is possible to predict the ups and downs of the car by taking into account information such as the registration status of calls in the car and the registration status of hall calls. predictions can be made.

Furthermore, in the above, the loading capacity of the car was detected just before the elevator started.
This is because the most accurate loading amount can be obtained.

As described above, the elevator car floats and sinks as passengers get on and off, and in particular, when the car sinks, it causes a sensory problem. Therefore, next, with reference to the flow shown in FIG. 3, the driving operation when it is predicted that the car will sink will be explained.

Generally, the inching operation for adjusting the ups and downs of the car is to correct the landing error of the elevator by operating the car at a very slow speed. It operates according to the flow shown.

(1) First, the car has landed on the floor and the door has opened.
Check that the car position is within the door zone, in the inching zone, and that the car is expected to sink when passengers get on and off, and when these conditions are met, the second speed Low speed side motor 8 of electric motor 8
b (steps 31 to 35).

(2) Check whether the landing error of the car exceeds a predetermined value. If the landing error exceeds the predetermined value, control the flow rate control valve 6 to perform inching operation at a slow speed (step 36 , 37).

In controlling the flow rate control valve 6 for the slow inching operation described above, the high-speed side motor 8a of the two-speed motor 8 and a normal flow rate control valve may be used, as in the case of normal operation control. However, there are limits to the characteristics of the control valve, making it difficult to control the car at very low speeds.

Therefore, in one embodiment of the present invention, the low speed motor of the two-speed motor is used for inching operation. As a result, the amount of pressure oil protruding from the fluid pressure source can be made smaller than usual, and the car can be controlled at very low speed even with a normal flow rate control valve.

Therefore, as in the embodiment of the present invention described above, if it is predicted that the car will sink due to passengers getting on and off at the next stopping floor, it is difficult to determine whether the landing error of the car will exceed a predetermined value. Regardless, by driving the low-speed electric motor in advance to prepare for the sinking of the car, the delay in starting the motor will no longer be a problem, and when the car actually begins to sink, inching operation can be started immediately. You can start.

One embodiment of the present invention described above includes two parts for driving a fluid pressure source.
Although a step-speed motor is used, this two-step speed motor may be constructed using two motors with different speeds, that is, different numbers of poles, or by switching the number of poles of one motor. It may be used. Alternatively, the speed of one electric motor may be controlled by an inverter device capable of frequency control, so that the motor is used at a low speed.

Further, in the present invention, a highly accurate flow control valve may be used, and the electric motor for driving the fluid pressure source may also be used for normal operation.

Next, control characteristics during upward operation will be explained with reference to the time chart of FIG. 4. This example shows a case where the car has a small loading capacity and there is a possibility that the car will sink as passengers get on and off at the next stop floor.

When the elevator is started, the car loading capacity is determined from the fluid pressure P, and the contactor 13 is closed during normal operation (hereinafter referred to as high-speed operation) and supplies power to the high-speed side motor 8a of the two-speed motor 8. Turn on.

This starts high-speed operation, and during this high-speed operation,
Using the method explained with reference to FIG. 2, it is predicted whether or not there is a possibility that the car will sink at the next floor where it will stop.

In this example, it is assumed that the car is predicted to sink, so after stopping at the next floor, the door is opened, and at the same time, contact is made to supply power to the low-speed motor 8b of the two-speed motor 8 in preparation for inching operation. Insert the container 14.

Then, as passengers got on board, the fluid pressure rose to 22.
That is, when the car sinks by a predetermined amount, the flow rate control valve 6 is controlled to perform slow speed control of the car and perform inching operation back to the original position.

At the start of the above-mentioned inching operation, the low speed motor 8a of the two-stage speed motor 8 is sufficiently rotating, so that pressure fluid can be supplied to the fluid pressure ram 2 without any time delay.

As mentioned above, one embodiment of the present invention uses the low-speed electric motor 8a during inching operation, so even if a failure occurs in the flow rate control valve 6, the flow rate of the fluid is small, so that To safely perform inching operation even when the door is open without causing the car to reach an abnormal speed.

Next, a method for determining the loading capacity of the car from the pressure of the fluid will be explained with reference to FIG.

FIGS. 5(a) and 5(b) are diagrams showing the relationship between the car loading capacity and the fluid pressure, and these relationships are usually linear. The pressure under no load corresponds to the weight of the car.

Therefore, under two different conditions, for example, the pressure P at no load
0 and the pressure P at the rated loading capacity, the relational expressions between the pressure and the loading capacity can be determined as shown in equations (1) and (2).

Pressure = K, X (loading capacity) 10P.・・・・・・(1
) Therefore, the loading capacity. -(1/Kl)X (Pressure 1P.) ・・・・・・
- (2) In the above formulas (1) and (2), K1 is a constant.

Therefore, when adjusting or installing an elevator, first detect and store the fluid pressure P0 in the no-load state (in this case,
Electrically rewritable memory, e.g. EEP
(It is preferable to store it in ROM etc.), then load the rated load on the car, detect the fluid pressure P at that time,
By calculating and storing the constant K in equations (1) and (2) above using these pressures, the above (2)
The loading capacity of the car can be determined using the formula.

[Effects of the Invention] As explained above, according to the present invention, it is possible to predict in advance the ups and downs of the car due to changes in the loading capacity due to passengers getting on and off after landing on the car. By driving in advance, inching operation can be carried out quickly, landing errors can be improved, and passenger discomfort can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a flowchart explaining the operation of predicting the ups and downs of the car, FIG. 3 is a flowchart explaining the operation of inching operation, and FIG. The figure is a time chart illustrating the overall operation of an embodiment of the present invention, and FIG. 5 is a diagram illustrating a method for determining the loading capacity of a car from the pressure of fluid. 1... Car, 2... Fluid pressure ram,
2a...Plunger, 3...Pulley,
4...Rope, 5...Spring, 6...
...Flow rate control valve, 7...Fluid pressure source, 8...
・Two-speed motor, 8a...Low speed motor, 8
b...High-speed side electric motor, 10...Control device, 12...Speed detector, 13-15...
... Contactor, 17a, 17b ... Inching zone detector, 18 ... Door zone detector, 20
...Fluid pressure detector. JP3 56375 (8)

Claims (1)

[Claims] 1. In a fluid pressure elevator that controls the speed of a car by controlling the flow rate of pressure fluid supplied to a fluid pressure ram or pressure fluid discharged from a fluid pressure ram,
A fluid pressure system characterized by comprising means for detecting the load amount in the car, and means for predicting the ups and downs of the car due to changes in the load amount at the next stop floor based on the detected load amount. Elevator control device. 2. The control device for a fluid pressure elevator according to claim 1, wherein means for supplying pressure fluid is activated based on a prediction result of the means for predicting ups and downs of the car. 3. The means for supplying pressure fluid is constituted by a two-speed electric motor and a pump, and when the means for supplying pressure fluid is activated based on the prediction result of the means for predicting the ups and downs of the car, 3. The control device for a fluid pressure elevator according to claim 2, wherein the control device starts a low speed motor of the stage speed motor. 4. When the means for supplying pressure fluid is constituted by an electric motor controlled by an inverter and a pump, and the means for supplying pressure fluid is activated based on the prediction result of the means for predicting ups and downs of the car, 3. The control device for a fluid pressure elevator according to claim 2, wherein the electric motor controlled by the inverter is rotated at a low speed. 5. Claims 1 to 5, characterized in that the means for detecting the loading amount in the car calculates the loading amount in the car based on the detected pressure of pressure fluid. A control device for a fluid pressure elevator according to item 1 of item 4. 6. The operation of the means for supplying pressure fluid based on the prediction result of the means for predicting the ups and downs of the car is performed only when the car is within a predetermined landing error. A control device for a fluid pressure elevator according to one of the items 2 to 5. 7. The operation of the means for supplying pressure fluid based on the prediction result of the means for predicting the ups and downs of the car is performed only when the car is within the door zone and the door is open. A control device for a fluid pressure elevator according to one of claims 2 to 5. 8. The calculation of the loading amount in the car based on the detected pressure of the pressure fluid by the means for detecting the loading amount in the car is performed under two different conditions when adjusting the elevator or installing it. 6. The control device for a fluid pressure elevator according to claim 5, wherein the control is performed using an arithmetic expression determined from the pressure of the fluid and the loading capacity of the car. 9. The control device for a fluid pressure elevator according to claim 8, wherein the constants of the arithmetic expression are stored in an electrically rewritable nonvolatile memory.