JPS60148877A - Controller for hydraulic 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 [Technical Field of the Invention] The present invention relates to a control device for a hydraulic elevator.

[Prior art]

Conventional hydraulic control methods for hydraulic elevators include a flow rate control valve, a pump control method, and an electric motor rotation speed control method, but the flow rate %51.19AI valve method rotates the electric motor at a constant rotation when ascending, and the hydraulic pump This speed is controlled by adjusting the amount of oil discharged from the car back into the tank using a flow control valve.Also, when descending, the descent of the car due to its own weight is controlled by a flow control valve. Which speed is to be controlled.

This system circulates an excess amount of oil when ascending, and when descending, the positional power key is consumed to heat the oil, resulting in a large power key loss and a significant rise in oil temperature.

To overcome this drawback, there is a system in which only the required amount of oil is fed during upward movement, and the electric motor is regeneratively braked during downward movement.For example, there is a pump control system and an electric motor rotation speed control system. The pump control method uses a variable displacement pump and makes the discharge amount variable by a total control device of the pump itself, but the structure of the control device and the pump is complicated and expensive.

On the other hand, in recent years, with the advancement of technology including semiconductors, a method (VVVF control) of controlling the rotation speed of an induction motor over a wide range by changing the voltage and frequency has been considered. -98471) This gold leaf is based on the electric motor rotation speed control method.

What is the pump discharge amount using a constant discharge pump? ``It is a device that is controlled variably by changing the rotation speed of the rotor, and is inexpensive and highly reliable.

By the way, in a hydraulic elevator, when the oil temperature decreases, such as in winter, the viscosity changes, which may lead to worsening of first ride comfort or insufficient motor torque at startup.

In the V, VVF control described above, since the power loss is small, the oil temperature rise is less than 2 or less compared to the pump control method described above, but it does not cause the problem noise in winter etc. There was a fear that it would get lost.

[Summary of the invention]

This invention was made to solve all of these problems, and its purpose is to use the regenerated power to raise the temperature of the hydraulic oil when the electric motor that drives the corner is in regenerative operation. , and the oil temperature raising operation is performed only once during descending regenerative operation and the oil temperature drops below a certain value, thereby keeping the oil level at an appropriate level at all times and effectively providing regeneration to the elevator. Is it labor-saving and labor-saving that does not use all the extra power? We offer a complete range of hydraulic elevators that can be scaled.

Furthermore, in this invention, the hydraulic elevator is VVVF
The regenerated electric power generated during descent can be used to compensate for oil temperature drop and to cool the gas cylinder, which is a disadvantage of hydraulic elevators, without installing an expensive regenerative inverter. Therefore, it is an object of the present invention to provide a hydraulic elevator which is inexpensive and has a large labor-saving and labor-saving effect.

[Funny example of invention]

This invention will be fully explained below with reference to nine drawings.

In Fig. 1, a hydraulic cylinder (2) is installed at the bottom of the hoistway (Ii), and this cylinder is filled with hydraulic oil, and a plunger (4) moves up and down by controlling the amount of oil.Plunger There is a parenthesis (5) in the @ section of (4).

They are connected at the floor (5a), and the heel (5) moves up and down within the hoistway (1) and lands at an appropriate designated landing (7)K. Although only one set of cams (8) provided on the back surface of the car (5) are shown in FIG. 1, this landing operation is provided correspondingly to each floor and both in the vertical travel direction. This is achieved by matching the deceleration command switch (9) and the stop command switch QOI.

A direct valve (formerly) is installed between the hydraulic pump Oz and the cylinder f2+, and when supplying oil to the cylinder (2), the amount of oil flows as is, and when returning from the cylinder (21) to the oil amount tank (151), a command signal is sent. The oil is energized by K so that the jack (from 21 starts sending oil (3) from all pumps α2) to the tank discharge, and is energized by the downward continuous running command of the cage (5).

Induction electric motor 03) is an electric [fi contactor contact (30a)
~ (30C) The whistle, power is supplied through i, but the contact (30
a) ~ (SaC) f5) When a travel command for K is issued.

The power supply to the induction motor OJ, which is closed immediately before the corner (5) stops landing, is supplied by a third-phase induction motor OJ, which is converted into three-phase AC, R, S, and T2 DC. Converter t211 consisting of
This is done through a capacitor C which smoothes the output of the 1+, and a PWM type inverter (23) which controls the pulse width of the smoothed DC to generate AC power of variable voltage and variable frequency.

The power regeneration inverter 04) has a pair of terminals on the input side connected between the converter (211 and the inverter (support)), and the three terminals of the output 111i1 or the three-phase AC current (ll
jl, R, S.

When the electric motor (13) is in regenerative operation.

It is detected by the regeneration control device (27), and the inverter (2
Control the firing of the thyristor in 4) to fully regenerate the electric power.

The speed %i control device (251) compares the output of the speed generator 0, which detects the speed of the electric motor α3, with the output of the pattern generator tf26+, which generates the speed control signal, and compares the output of the inverter Q, 3). Generates control signals. The pattern generator (6) is closed when a signal (9a) from the deceleration command switch (9), a signal (10a) from the stop command switch (101), and a start command are issued. Pattern generation is controlled by the output from the contacts (31) and (1), which open when .

The oil tank is filled with hydraulic oil, and pump α2 supplies the oil and receives the entire ring return.

This oil tank 051 is provided with an oil temperature detection device @-a6+.

The output signal is input to the oil temperature control device, and the oil temperature control device cL mark further indicates the output signal (
Sl) is input. Based on these two input signals, the oil temperature control device 0 mark detects all cases where the oil temperature is lower than a predetermined deviation and the oil temperature is in regenerative operation.

Operate the heater ←71- provided in the oil tank (151) to keep the oil temperature within the appropriate range.

This oil temperature control will be further explained.

When a descending command is given, the coil 5 of the descending electromagnetic switching valve α1) is energized and the jack starts to gradually send oil to the pump. In addition, the contacts (30a) to (10(1) of the electromagnetic contactor
is closed, power is connected to the induction motor (131), a running pattern is output from the pattern generator, and the speed control signal (251 drives the inverter 1'-tor (23+) to reverse the induction motor housing. Reverse pump azt.

At the time of C, in the pump θ2), the amount of oil sent from the jack (2j) is larger than the amount of oil controlled by the motor α3, so the pump ←2 causes a regenerative braking force 5' to the motor 03.
) to drive.

At this time, the regenerative power from the motor (13+ is in/<
-ta(23+'e) and is inversely converted to direct current. At this time.

The DC output is charged into a capacitor between the DC circuit 00 between the inverter (support) and the converter (21). When the voltage E becomes higher than the constant voltage E1 of the voltage source 6z, the regeneration control device 127+ starts outputting. Return 1
j 21st gHc, 1. ;The comparator 00 operates and outputs a signal "H". This allows BCR
A signal OUT is output by the C Radoff circuit (3 (8)), which makes the first regeneration inverter C141 conductive and connects the power supply (R, S, T
) Returns the regenerated power to the inverter (23+).The constant voltage E1 is set to a value slightly higher than the voltage E obtained by rectifying the inverter (23+). If the width of the NTO thermistor C in the oil decreases, the resistance value increases, and as it increases, it decreases).
Terminal voltage of resistor G9 at 3rd pin 1) or source (
A) becomes smaller than the reference voltage v1 of comparator G0
outputs the output signal “L”. A by inverter (support)
The input signal to the ND gate 0') becomes "L", and the output Sl of the regeneration control device (27) in Fig. 2 also becomes "L", so the AND gate C31 outputs "'H". , transistor (4@ is driven, relay +41
1 is excited. As a result, the normally open contact (41a) is closed and the heater 07j is made conductive, so that the oil is heated and the oil l! j Increase A'i. Ga is a constant reference voltage that supplies current to the thermistor α, etc., and 4z is a diode for preventing surges in the relay coil.

After that, the oil 6B'r rises, and when it exceeds the setting (A+ U TO), the comparator (371) outputs the output signal °°H "full," which is reversed by the inverter (to) and becomes "°L"', AND gate C' 19 is set to have a full output "L". Therefore, the heater Q71 stops its heat generation operation. This operation keeps the oil flow within an appropriate range.

The above width v control operation is performed when 'tt<#1 machine u3 is in regenerative operation, that is, the regeneration control device 0D is
It only takes place when a signal is being emitted.

The output H (H4, H2) of the pond width control device θ seconds is shown in the table below.

Considering that in the conventional valve control system, all the positional pressure during descent is converted into heat, causing a considerable rise in oil temperature, and necessitating complete cooling, it is possible to increase the oil temperature f even during descent. Enough of the unlucky.

On the other hand, the car reaches full speed under speed control by the electric motor, and when it reaches the deceleration point, the deceleration command switch sends a signal (9a).
With this, the pattern generator outputs the electric motor (13
The rotation speed of the car is gradually lowered, and the car decelerates.

When the cam (8) engages with the stop command switch 00), a signal (10a) K causes the pattern generator Q6) to further lower the motor rotation speed and bring it to a stop. is demagnetized, so it gradually closes, and after a slight delay, the excitation of the magnetic finger contactor "a" is cut off, so the contacts (30a) to (30d) When the solenoid valve α1) is completely closed, the car stops.

By the way, when controlling the hydraulic elevator 1VVVF, when descending, the speed of the car is controlled by the location braking of the electric motor, so first regenerative power is generated, so the inverter Ql+K power flows into it. The power failure of C is accumulated in the capacitor 1221Vc, causing a total voltage rise, which may destroy the inverter elements.

For this reason, a power regeneration inverter maintains the inverter by converting all of the regenerated power to the AC side. However, having 9 inverters for regeneration makes the device complicated and expensive, and the power supplies R and S during power regeneration.

If no other load is connected, the voltage will rise even if a regenerative inverter is installed, and there is a risk that the inverter (231) will be completely destroyed.A second embodiment of the present invention that also solves this problem will be explained. do.

In other words, a 9 regeneration inverter (not installed along the 2nd line, configured to consume power in the DC voltage section, and used as an oil temperature raising device when the oil temperature drops due to the 1st regeneration inverter, and when the oil temperature is above a certain level) The electric motor blower 1 is used for the fan, etc. in the control panel.

In FIG. 4, the same or similar components as those in the embodiment shown in FIG. 1 are given the same reference numerals.

The difference from the embodiment shown in FIG. 1 is the element receiving the output of the oil temperature control circuit and the regeneration control device W@ in FIG.
This is a modified internal configuration that is completely omitted and is built into the oil temperature control circuit.

The oil temperature control circuit (18A) receives the signal from the thermistor α and all DC voltage inputs, and depending on the status of each input, operates the heater A7"+ or the motor blower 0.
1 Fully operated 9. Heater α7- and motor blower α9 are connected to the DC side of inverter C73) and supplied with power.

In Fig. 5, the DC voltage E due to the first regenerative power increases,
When E>El, the comparator (31A) operates and outputs a signal "H".

At this time, if the oil temperature is lower than the predetermined oil temperature To (for example, 10°C), the resistance of the thermistor α mark in the tank Q51 increases, so the voltage V at the resistance 0j decreases, and the comparator (37A) The output “H” output and the input of A/D Kate (40A) both become “HI+” and the oil temperature control device (
An "H" signal is generated at the output terminal HK of the transistor 18A), which drives the transistor eiQli. Therefore, the heater αη operates to increase the oil temperature. In conventional valve control, the position control key when descending is all generated by oil heat generation, which causes a considerable rise in oil pressure. It is.

Also, during the first regeneration, the oil temperature To is above a certain value.

There is no need to raise the oil temperature, and the comparator (37A)
outputs the signal “L+”, so AND cable 1-(40A
) is "L", and the NOT gate (1□□□ becomes "°H"), making the transistor (51) k conductive and supplying power to, for example, a motor floor, to cool the motor.

In addition, the resistor C provided with the comparator (37A) K
11fl and 01 have hysteresis, and depending on the settings, for example, the oil temperature drop signal becomes full height at 10°C, and the oil temperature 'II
:The output of the oil temperature drop signal is maintained until 15℃ to prevent the oil temperature from dropping frequently. Comparator (31A) K is provided with a resistor (4a (43 is also similar).

In addition to the above, regenerative power consumption when the oil temperature is rising may be consumed in the machine room as a resistor, in addition to the blower 1 machine room ventilation fan in the control panel and the oil tank radiator blower. In short, any electrical device other than the above-mentioned heater that consumes all the power is fine.

This regenerative power consumption does not directly increase the oil temperature as in conventional valve control, so it has little effect on riding comfort.

〔Effect of the invention〕

As described above, the present invention uses the regenerated power to raise the total temperature of the hydraulic oil when the electric motor that drives the car is in regenerative operation, and also performs an operation to raise the temperature of the oil during regenerative operation when descending. In addition, since it is performed only when the oil temperature drops below a certain value, the oil level can always be kept in a proper condition, and the regenerated power to the elevator can be used effectively, which saves labor and costs as no extra power is used. It is what it is.

Furthermore, in the second embodiment of the present invention, the hydraulic elm 1
VVVF Control 1 - Regenerated power during descent caused by control 1? , without installing an expensive regenerative inverter, it can be used to compensate for oil temperature drop due to changes in oil temperature, which is a drawback of hydraulic elevators, and to cool electrical equipment.
It is possible to provide a hydraulic elevator that is inexpensive and has a large labor-saving and labor-saving effect.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the entire configuration of the control device of the present invention, and FIG.
Figure 3 is a circuit diagram showing the entire internal configuration of the regeneration control device, Figure 3 is a circuit diagram showing the internal configuration of the oil temperature control device, Figure 4 is a circuit diagram showing the configuration of the second embodiment of the invention, FIG. 5 is a circuit diagram showing the internal configuration of the oil temperature controller. (I6) is the thermistor, α force is the heater, discharge is the oil temperature control device, CD is the regeneration control device Agent Masuo Oiwa Procedural amendment (voluntary) 1. Indication of the case Japanese Patent Application No. 59-2261 2 Title of the invention Hydraulic elevator control device 3 To the person making the amendment Representative Hitoshi Katayama Department 4 Agent + 11 Drawings. 6. Contents of amendment +1+ Figures 2 and 3 of the drawings are corrected as not being placed in the attached drawings, and Figure 5 is corrected to be included in the attached drawings. (2) The specification shall be amended as follows.

Claims (1)

[Scope of Claims] (11) When the car is in continuous upward movement, the electric motor is operated to drive the pump and hydraulic oil is sent out from the pump, and when the car is in downward movement, the potential energy of the car is used to cause the hydraulic oil to flow into the pump. In a Y ball elevator where the motor is reversed and the motor is operated in full regenerative mode; a regeneration control means that detects whether or not the motor is operating regeneratively; and issues a signal when it detects that the motor is operating regeneratively; Oil temperature detection means that detects and generates a temperature signal; Heating means that raises the temperature of the hydraulic oil; When all the width # signals and regeneration signals are input, and the oil temperature is below a predetermined value and it is determined that regenerative operation is in progress, the above Oil temperature control means for operating the heating means; 1.- A control device for a hydraulic elevator. +2+ When the car is in ascending operation, the electric motor e is operated to drive the pump and the hydraulic oil is sent out from the pump, and the car is in descending operation. In a hydraulic elevator in which hydraulic oil is caused to flow into the pump and reversed by the potential energy of the corner, and the electric motor is operated regeneratively; it is detected whether or not the electric motor is operating regeneratively. When it is detected that the electric motor is operating regeneratively, a signal is activated. Regeneration I control means that detects the entire width of the hydraulic oil and generates a warning signal; Heating means that raises the entire temperature of the hydraulic oil; Power consumption that occurs during the regenerative operation* A consumption means that does not cause a temperature change to the hydraulic oil; When the temperature signal and regeneration signal are input and it is determined that the oil temperature is below a predetermined value and regenerative operation is in progress, the regeneration box is activated in the heating means. , and when it is determined that the oil temperature is higher than a predetermined value and that the regenerative operation is in progress, the consumption means Vc
19j Oil temperature control means to supply full raw power; Fully equipped hydraulic elevator control device.