JPS62285884A - 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 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a hydraulic elevator whose speed is controlled by controlling the flow rate of pressure oil supplied to or discharged from a hydraulic cylinder.

[Conventional technology]

In conventional hydraulic elevators, the speed of the elevators is controlled by sequentially operating flow control valves hydraulically or mechanically.

Note that this type of device is disclosed in Japanese Unexamined Patent Application Publication No. 53-1989, 4525.
There is one described in Publication No. 2.

[Problem that the invention seeks to solve]

With this method, the running characteristics change as the oil temperature or load changes. i.e. acceleration, deceleration.

Full-speed running speed 2, landing speed, etc. change. For this reason,
The time spent traveling at the landing speed varied, which could have a negative impact on passenger psychology.

An object of the present invention is to correct the running characteristics of a hydraulic elevator, which vary depending on the load and oil temperature, by using a simple control circuit configuration, and to always keep the landing running time constant.

The purpose of the present invention is to provide a hydraulic elevator with good riding comfort.

[Means for solving problems]

In order to achieve the above object, the present invention detects the load of a hydraulic elevator and the temperature of hydraulic oil flowing through a flow control valve,
The deceleration command delay time is determined from the detected value, and deceleration control is performed at the time of landing.

[Effect]

The load and oil temperature of a hydraulic elevator are detected, and the detected values are substituted into an arithmetic expression expressed as a relationship between load and temperature to determine deceleration delay time. Since the deceleration delay time is determined from the elevator operating conditions, the landing time can be kept constant.

〔Example〕

Hereinafter, the invention will be described in detail using figures showing one embodiment of the invention.

FIG. 1 shows the configuration of a hydraulic elevator according to the present invention,
Control device with calculation function 5. A control device section consisting of an electromagnetic control valve 4, a flow rate control valve 6. The main components are a hydraulic drive unit consisting of a hydraulic cylinder 9 and a car 12 to be controlled. The control command device 1 excites the electromagnetic control valve 4, and the flow rate control valve 6 controls the flow rate of pressure oil supplied from the hydraulic pump 3 to the hydraulic cylinder 9 or from the hydraulic cylinder 9 to the tank (
(not shown) to control the rise or fall of the plunger 9' of the hydraulic cylinder 9.

Although the seat 12 can be directly connected to the top of the plunger 9', FIG. 1 shows a system in which the seat 12 is supported via a pulley 10 and a rope 11.

One end of the lobe 11 is fixed, and the other end is fixed to the seat 12. As a result, when the plunger 9' rises or falls, the seat 12 also rises or falls.

Here, as shown in FIG. 2, there are two electromagnetic control valves 4 for raising and lowering, and solenoids U'l and U2 (Di, D2) are energized at the same time by the raising (lowering) starting command from the control command device 1. , the flow rate of the pressure oil flowing through the flow rate control valve 6 gradually increases, and the car 12 starts up and accelerates and rises (or descends) at full speed. Switch 13 (
By switching 13') to 12, the control command device 1 de-energizes the solenoid Ul (Di).

Therefore, the flow rate of the pressure oil flowing through the flow control valve 6 decreases, and the car 12 starts decelerating. This point corresponds to point A in FIG. After this, the car 12 finishes decelerating and runs at a constant speed (landing speed). Switch 14 provided at the stop position
(14') is switched between the driver and 12, so that the control command device 1 de-energizes the solenoid U2 (D2).

As a result, the flow rate of the pressure oil flowing through the flow control valve 6 becomes zero, and the ride stops at 12. This point corresponds to point B in FIG.

However, if the load of the hydraulic elevator or the temperature of the oil changes, the flow rate characteristics of the flow rate control valve 6 change, so that the speed characteristics of the 1st power and the 12th power change. In other words, the acceleration/deceleration, the speed during full-speed running, or during landing-on-bed running change. An example of this is shown in FIG.

Compared to the driving characteristics shown by the solid line, when the load or oil temperature is changed, the characteristics are shown by the two-dot chain line. In this way, the time T during which the vehicle travels at the landing speed changes from Tt'' to Ts''. In the case of the characteristic shown by the two-point ffi line in the figure, T, 2
Because the time is long, passengers feel that B% does not open even though the elevator has finished decelerating, causing frustration. This tendency increases as the range of change in load and oil temperature increases.

In view of these circumstances, the present invention provides a hydraulic elevator that keeps the landing time constant even if the load or oil temperature changes.

That is, a load sensor 8 and a temperature sensor 7 are provided to determine the current operating conditions of the hydraulic elevator.

It is determined how much this operating condition differs from the reference operating condition, and the control command device 1 sends a deceleration command by □ to Δt.
The flow rate control valve 6 is operated with a delay of 10 minutes. In FIG. 1 showing one embodiment, a load sensor 8 detects the load of the car 12, and a temperature sensor 7 provided near the flow control valve 6 detects the oil temperature.

This signal is sent to the load judgment table 24 in the arithmetic and control unit 5 shown in FIG. The data is sent to the oil temperature determination device 25 to perform determination calculations on each load and oil temperature, and the calculated values are used in the calculation device 26 to calculate a deceleration command delay time Δt. If this load condition or oil temperature is measured in response to an elevator drive command, a state value immediately before the hydraulic elevator starts and that does not include a transient response can be detected.

The calculation formula for the deceleration command delay time Δt is the load P and the oil temperature T.
Display as a quadratic or linear function. Here, we will show a case where it is given by the following equation as a quadratic function.

Δt=aT”+bT+cP”+dP+e ・=■■
The coefficients of the load P and oil temperature T in the equation are stored in advance in the arithmetic unit 26 of the flow control valve 6 according to the characteristics.
Load determination device 24. Calculations are performed using the formulas for each value determined and calculated by the oil temperature determination device 25, and as shown in FIG. Deenergize by delaying Δ by the time until point A'. As a result, the running characteristics become the characteristics shown by the broken line in the figure. The landing time can be shortened from T- to T-, making T,3=Rt''.In this way, by delaying the start time of deceleration of the hydraulic elevator by Δt, the deceleration time can be reduced regardless of load conditions and oil temperature conditions. In addition, it is possible to set the floor landing traveling time to Ttl, that is, according to the present invention, a constant floor landing traveling time can be ensured, so there is an effect that a hydraulic elevator with good riding comfort can be constructed.

In the embodiment shown in FIG.
Although the case where the load of No. 2 is directly detected is shown, the same effect can be obtained by detecting the pressure acting on the hydraulic cylinder 9, and the present invention is not limited to the embodiment.

Furthermore, even if the coefficients a-e shown in equation 0 change due to variations in the flow rate control valve 6, the present invention always maintains optimal conditions by examining the characteristics of the flow rate control valve 6 and changing these coefficients as appropriate. Since it can be set, the landing time can always be kept constant.

〔Effect of the invention〕

According to the present invention, it is possible to ensure a constant landing travel time even when the load and oil temperature change, and to provide a hydraulic elevator with good riding comfort.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a hydraulic elevator according to an embodiment of the present invention, Fig. 2 is a block diagram of the electromagnetic control valve shown in Fig. 1, Fig. 3 is a speed characteristic diagram with respect to the load of the car, and Fig. 4 is a diagram of the first embodiment of the hydraulic elevator. FIG. 2 is a configuration diagram of an arithmetic and control device. DESCRIPTION OF SYMBOLS 1... Control command device, 2... Motor, 3... Hydraulic pump, 4... Electromagnetic control valve, 5... Arithmetic control device,
6...Flow rate control valve, 7...Temperature sensor, 8...Load sensor, 9...Hydraulic cylinder, 9'...Plunger, 10...Pulley, 11...Rope, 12...・
Passenger car, 24... Load determination device, 25... Oil temperature determination device, 26... Arithmetic device. Sue. Ya 2nd 3rd mouth °1

Claims (1)

[Scope of Claims] 1. The car is raised and lowered by controlling the flow rate of pressure oil supplied to or discharged from a hydraulic cylinder, and when landing on the floor, the car runs for a deceleration command delay time that delays the start of deceleration from a predetermined deceleration start point. In a hydraulic elevator that decelerates after deceleration, a detection means for detecting at least one of the load of the hydraulic elevator or the temperature of the pressure oil, and a detection means for detecting at least one of the load of the hydraulic elevator or the temperature of the pressure oil; A hydraulic elevator comprising: means for storing a relational expression; and means for determining the deceleration command delay time Δt from the value detected by the detection means using the relational expression.