JPS629510B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic elevator control device, and more particularly to a hydraulic elevator control device suitable for eliminating the influence of increased viscosity when oil temperature drops and performing stable elevator control.

Figure 1 shows a schematic configuration diagram of a general hydraulic elevator, in which 1 is a tank, 2 is an oil tank, 3 is a tank.
is an electric motor, 4 is a pump, 5 is a flow control valve, 6 is a jack, 7 is a cylinder, 8 is a plunger, 9
10 is a main pipe, and 11 is a branch pipe.

In this configuration, when the car 9 is raised, the oil 2 in the tank 1 is discharged by the hydraulic pump 4 driven by the electric motor 3, and the flow rate is controlled by the flow control valve 5 and sent to the jack 6. In the jack 6 that receives the pressure oil, the plunger 8 is pushed up from inside the cylinder 7 and rises.
The car 9 connected to this will rise.

On the other hand, when the car 9 is lowered, the weight of the car 9 causes the oil in the cylinder 7 to flow back through the main pipe 10 to the tank 1 through the branch pipe 11 while controlling the flow rate with the flow control valve 5 .

As described above, when raising or lowering the hydraulic elevator, it is necessary to control the flow rate of pressure oil by the flow control valve 5 in order to match the speed of the car 9 to a predetermined speed pattern. Therefore, the function of the flow control valve 5 is extremely important in controlling the hydraulic elevator.

On the other hand, the flow rate control valve 5 is often quite sensitive to the viscosity of the oil 2, and especially when the back pressure of the oil itself is used to control the flow rate, the influence of the difference in viscosity is very large.

Incidentally, it is known that the viscosity of oil changes greatly depending on temperature. An example of the relationship between oil temperature and viscosity is shown in Figure 2. According to this, from 80℃ to 40℃
As the oil temperature (oil temperature) decreases to about ℃,
The viscosity tends to increase roughly proportionally. However, it can be seen that the viscosity increases rapidly from around 20°C to 0°C.

In such a case, the performance of the flow control valve 5, which is optimally designed when the oil temperature is around 40°C, changes significantly when the oil temperature falls below 20°C, making it difficult to operate the elevator normally.

On the other hand, when the oil temperature reaches 60°C or higher, air bubbles and turbulence occur in the oil due to cavitation, which similarly makes elevator operation difficult.

Therefore, in a hydraulic elevator using ordinary oil having the characteristics as shown in FIG. 2, for example, it is desirable that the power unit operate within the oil temperature range of 20°C to 60°C.

However, in elevators installed in cold regions, the room temperature in the machine room where the power unit is installed can naturally become low, and if this drops below 10°C, the oil temperature in the tank will drop below 20°C, so the above-mentioned There is a problem in that the movement of the flow control valve changes, making normal operation of the elevator difficult.

Conventionally, the only way to deal with such a drop in oil temperature was to operate the elevator only during the day when the room temperature rises, which significantly deteriorated the operating rate of the elevator.

Therefore, an object of the present invention is to eliminate the above-mentioned problems of the prior art, and to bring the oil temperature to the optimum temperature by raising and lowering the elevator with the car door closed when the oil temperature drops. An object of the present invention is to provide a new hydraulic elevator control device that enables good control using a flow rate control valve.

Figure 3 is a system diagram showing the hydraulic system of a general hydraulic elevator to which the present invention is applied;
5 and 16 are pipes, 17 is a rising valve, 18 and 23 are solenoid valves, 19 is a check valve, 20, 21, 24, 25
2 represents a throttle valve, and 22 represents a lowering valve.

In this configuration, when the elevator ascends, the pump 4 is first driven by the electric motor 3, and pressure oil is pumped through the pipes 15, 16, the ascending valve 17, and the branch pipe 1.
1 to tank 1. At the next moment, the solenoid valve 18 is energized to gradually close the rising valve 17, and the pressure oil from the pump 4 is transferred from the check valve 19 to the path where it is gradually sent to the cylinder 7 through the main pipe 10. As a result, the plunger 8 is pushed up, and the cage 9 attached to it is raised. Note that the acceleration state of the elevator at the start of the ascent is adjusted by the throttle valve 20.

When the elevator stops ascending, the ascending valve 17 is gradually opened by demagnetizing the solenoid valve 18, and the pressure oil from the pump 4 is returned to the tank 1.
Stop car 9. In this case, the stop state is adjusted using the throttle valve 21.

On the other hand, the elevator is lowered by using the weight of the car 9. That is, when the elevator is stopped, the pressure oil in the cylinder 7 is stopped by the check valve 19 and the descending valve 22, but when a command to start descending the elevator is issued, the solenoid valve 23 is energized.
The descending valve 22 gradually opens, and the pressure oil in the cylinder 7 flows from the main pipe 10 to the descending valve 22 to the branch pipe 11.
Go through and return to tank 1. For this reason, the car 9 is driven downward by its own weight, but the downward acceleration state at this time is adjusted by the throttle valve 24.

On the other hand, the descent is stopped by demagnetizing the electromagnetic valve 23 and thereby closing the descent valve 22, thereby stopping the car 9. Adjustment of the stopped state at this time is performed by the throttle valve 25.

FIG. 4 is a wiring diagram showing an example of the control circuit of the hydraulic system shown in the third diagram, in which 30 and 31 are power lines, 41 and 42 are blocking diodes, and 38
is a rising conductor that turns on and off the input of the electric motor 3; 32 and 33 are rise and fall control relays that turn on and off the rise solenoid valve 18 and the fall solenoid valve 23, respectively; 39 and 40 are rise and fall control relays when the car is rising or falling; A landing limit switch that opens when the landing position is reached; 34 and 35 are upward direction auxiliary relays; 34
-1 is a contact point of the upward direction auxiliary relay 34;
35-1 to 35-4 are the contacts of the direction auxiliary relay 35 on the upward side, 36 and 37 are the direction auxiliary relays on the downward side, and 36-1 are the directional auxiliary relays 3 on the downward side.
6 contacts, 37-3 are contacts of the direction auxiliary relay 37 on the descending side, and 49-1 and 50-1 are direction selection relays to be described later that operate to close when the descending or ascending direction is selected. 49 and 50 contacts.

In this configuration, its operation will be explained when it is raised. The upward direction is selected and the contact point 50-
1 closes, the direction auxiliary relay 34 on the rising side is released, and since the contact 34-1 is closed, the direction auxiliary relay 35 on the rising side is pressurized. For this reason, the contacts 35-4 and 35-1 close, which pressurizes the contactor 38 and the lift control relay 32, causing the electric motor 3 to rotate, while the lift solenoid valve 18
is excited, so car 9 begins to rise. Basket 9
When rises, the implantation limit switch 39 closes,
Since the direction auxiliary relay 34 is pressurized, the contact 34-
1 is open, but the direction assist relay 35 is held by the landing limit switch 39. Then, when the car 9 reaches the landing position, the landing limit switch 39 is activated.
When is opened again, direction assist relay 35 is released and its contact 35-4 is opened, thereby opening contactor 38 and contact 35-1. As a result, the lift control relay 32 is released and the electric motor 3 for driving the pump is stopped, and at the same time, the lift solenoid valve 18 is also closed and the car 9 is closed.
stops. At the same time, the contact point 35-2 opens, so the direction assist relay 34 is released and returns to the state before operation.

On the other hand, the descending operation of the elevator is carried out in the same manner as the ascending operation, except that there is no contactor 38 for the electric motor 3.

FIG. 5 is a partial wiring diagram of a hydraulic elevator control device according to an embodiment of the present invention which is additionally applied to the circuit shown in FIG. 4, and is particularly applicable to the control of the hydraulic system shown in FIG. 3. This is an example of an application case. 43 in Fig. 5 is a relay for oil temperature increase movement, 4
3-1, 43-2 are contacts of the relay 43, 44
45 is a detection contact of an oil temperature detector (not shown), 45 is a contact that indicates the condition for oil temperature rising operation, 46 is a door opening relay,
47-1 and 48-1 are contacts of floor position relays (not shown), and 49-2 and 49-3 are direction selection relays 49.
50-2 is a contact of the direction selection relay 50,
51 is a direction selection circuit, and 52-1 is a contact point of a call registration relay (not shown).

In such a configuration, the contact 44 of the oil temperature sensor is closed when the oil temperature is below the set value and opened when the oil temperature exceeds the set value. There is a difference of about 3°C. For example, if the temperature sensor is set at 25°C, the contact 44 will change from open to closed when the oil temperature drops below 25°C, and conversely will close when the oil temperature rises above 27°C. state to open state. In addition, the temperature increase movement relay 43
has the effect of increasing the oil temperature by raising and lowering the elevator with the door of the car 9 closed when the oil temperature drops. In addition, contact 45 is closed when the operating conditions for raising the oil temperature are met, and the elevator is stopped within the standard floor door zone, all doors are closed, and inspection is performed. It is closed under the condition that it is not in operation.
On the other hand, contact 52-1 becomes open when a call is registered.

The door opening relay 46 is a relay for issuing a door opening command, and when the oil temperature raising movement is being performed, it is disconnected from the power supply by the contact 43-2 and therefore does not operate.

Further, the direction selection relays 49 and 50 are pressurized and released upon receiving call information from the direction selection circuit 51, thereby determining the direction.

On the other hand, contacts 47-1, 48- of the landing position relay
1 is used to indicate the position, and contact 47-1 indicates that the car is within a certain range from the reference floor (usually 200
~300mm), it becomes open and contact 4
8-1 becomes open when the car enters 200 to 300 mm near the landing level of the floor that turns over as the car moves to increase the oil temperature.

The operation of the configuration as described above will be explained below.

First, when the oil temperature is above the set value, the direction selection circuit 51 determines whether the direction is upward or downward based on the floor and car position of the call from the call and car position outputs (not shown). direction selection relay 4
It is operated with 9 or 50 excited.

Now, when the elevator has landed on the standard floor, the oil temperature decreases under the closing condition of the contact 45-1, and when the contact 44 of the temperature sensor closes, the relay 43 for the oil temperature increase movement is pressurized. be done. As a result, contact 43-1
Since contact 47-1 is open when is closed,
The direction selection relay 50 is pressurized and the elevator starts to ascend with upward direction. When the car reaches near the turning floor, the contact point 48-1 opens, the upward direction selection relay 50 is released, and the landing limit switch 39 opens, so that the elevator lands on the turning floor. Through the above operations, when the direction selection relay 50 for the ascending direction is released before the elevator turns around and lands on the floor, the contact point 50-3 of the direction selection relay closes to select the direction for the descending direction. The relay 49 is pressurized and the elevator is given a downward direction.

After that, when the ascending direction auxiliary relay 35 is released and the elevator stops, the contact 35-3
is closed, the direction auxiliary relay 37 on the descending side is pressurized and the elevator immediately starts descending. In addition, when descending, the turnaround floor is detected in the same way as when ascending.
Needless to say, the descending motion is stopped and the ascending motion is started again.

The oil temperature increases while repeating the above-described operations, but when the oil temperature reaches a specified value, the elevator stops repeating the upward and downward operations. During this time, the door opening relay 46 of the elevator door is connected to the contact 43- of the oil temperature rising operation relay.
Since it has been released by 2, it will not be opened.

Note that if a call is registered during the oil temperature rising operation described above, the relay 43 for oil temperature rising operation is released by the contact 52-1, so that the elevator immediately returns to normal operation.

Therefore, while the elevator is on standby, the oil temperature in the tank is always maintained at contact 4 of the oil temperature detector due to the operation to raise the oil temperature.
Since the oil temperature is maintained above the operating range of 4, as long as this is done normally, even if you answer a call during bleed-off and cancel bleed-off, the elevator will continue to operate while the oil temperature is low. Not,
Therefore, it is possible to maintain a good and stable operating condition.

As described above, the present invention is configured to measure the rise in oil temperature by raising and lowering the elevator, so that a constant flow of oil is generated in the hydraulic system, which causes the oil inside the plunger to flow. Since the oil temperature can be maintained, it is extremely effective in ensuring the operating characteristics when descending compared to other methods of maintaining oil temperature using a heater or the like. In other words, since the oil in the plunger flows into the control valve when the elevator descends, by ensuring the oil temperature in the plunger, the inflow oil temperature of the control valve, which has a large effect on the operating characteristics of the hydraulic elevator, can be ensured. Therefore, it has an effective effect on the operating characteristics of the elevator when descending.

In the above embodiment, a single speed type hydraulic elevator having only one set of control valves for ascending and one set for descending was illustrated, but a hydraulic elevator having two sets of control valves for high speed and low speed is illustrated. When the present invention is applied to a stepped speed type hydraulic elevator, it is more effective to raise and lower the elevator at a low speed in order to raise the temperature.

As described above, according to the present invention, it is possible to obtain a hydraulic elevator control device that can ensure good operating characteristics of a hydraulic elevator in cold weather with an extremely simple configuration, and its usefulness is extremely high. It is a big thing.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a general hydraulic elevator, Fig. 2 is a characteristic diagram showing an example of the relationship between oil temperature and viscosity, and Fig. 3 is a hydraulic system of a general hydraulic elevator to which the present invention is applied. The system diagram shown in Figure 4 is the 3rd one.
FIG. 5 is a partial wiring diagram of a hydraulic elevator control device according to an embodiment of the present invention, which is additionally applied to the circuit shown in FIG. 4. be. 1...Tank, 2...Oil, 3...Electric motor, 4...
...Pump, 7...Cylinder 17...Rising valve,
18, 23...Solenoid valve, 19...Check valve, 20,
21, 24, 25... Throttle valve, 22... Lowering valve, 43... Oil temperature rising operation relay, 49, 50
... Direction selection relay, 44 ... Temperature detector contact.

Claims (1)

[Claims] 1. A valve control system that controls the rise and fall of the elevator by controlling the pressure oil sent from the pump to the cylinder and the oil returned from the cylinder to the oil tank;
A temperature detector detects the temperature of the oil; a condition detector detects the condition of the elevator, which is a condition for oil temperature rising operation; It is characterized by having a control means for raising and lowering the car while keeping the car door closed even when the car stops landing on a turnaround floor during ascending operation, and is characterized by maintaining the temperature of the pressure oil above a specified value. Hydraulic elevator control device.