JPS61140481A - Hydraulic 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] [Field of Application of the Invention] The present invention controls the flow rate of pressure fluid supplied to and discharged from a fluid pressure ram using a flow rate control valve to control the traveling speed of a riding corner and to control the fluid temperature by adjusting the flow rate. The present invention relates to a hydraulic elevator that provides feedback to the control of a control valve.

[Background of the invention]

Conventionally, this type of elevator was disclosed in Japanese Patent Application Laid-Open No. 57-126378.
As per the publication, when the car is going up, a part of the discharge flow rate of the fluid pressure pump is bleed-off controlled by the flow control valve, and when the car is going down, all the fluid from the fluid pressure ram is controlled by the flow control valve. Ta. Therefore, the pressure energy is converted into thermal energy by the flow control valve, and the fluid temperature increases. Particularly when the frequency of use is high, the fluid temperature rises significantly, exceeding the permissible operating temperature of the fluid, and the operation of the hydraulic elevator must be stopped. Alternatively, in order to continue operation, a cooler must be installed to cool the fluid. In addition, in the winter, the fluid used becomes colder than the permissible operating temperature, and thermal energy must be supplied to bring the fluid temperature within the permissible range.

For this purpose, it was necessary to use a plurality of dedicated temperature switches.

[Purpose of the invention]

An object of the present invention is to control fluid temperature by using the output of a temperature sensor for controlling a flow control valve, thereby eliminating the need for multiple temperature switches and at the same time allowing these set temperatures to be changed arbitrarily. The object of the present invention is to provide a hydraulic elevator that makes it possible.

[Summary of the invention]

In the fluid pressure elevator that is the object of the present invention, the temperature of the fluid is conventionally detected and the temperature is fed back to the operation control of the flow control valve.In the present invention, this temperature sensor output is fed back to the control of the flow control valve. At the same time, it is also used to control fluid temperature.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a fluid pressure elevator.

1 is a car, 2 is a pulley, 3 is a hydraulic ram that pushes up the car and 1 via a rope 4, 5 is a flow control valve that controls the pressure fluid supplied to and discharged from the hydraulic ram 2, and 6 is driven by an electric motor 7. 9 is a tank, 10 is a filter, 11 is a temperature control device that controls the fluid temperature, 8 is a temperature sensor, and the figure shows the case where it is installed at the flow rate control valve 5, but the tank 9 is a pump that generates fluid pressure. The elevator can be operated by commands 12 from switches 14 from inside the tower where the elevator car and elevator 1 go up and down, and switches 15 from other switches inside the elevator car. The control device controls the electric motor 7 and the temperature control device 11, and at the same time controls the flow rate control valve 5 via the control valve control device 13.

In a fluid pressure elevator, when the fluid temperature changes, its viscosity also changes, and the flow rate characteristics of the flow control valve change under the same control conditions. It is changed by the control device 12. It is carried out within the temperature range shown in Figure 2, that is, as a control method,
Depending on the detected temperature, the speed pattern of the car is changed or the deceleration start point is slightly delayed from the deceleration command point, both of which aim to improve the ride comfort of the elevator and reduce energy consumption.

On the other hand, in a fluid pressure elevator, the temperature range of the fluid used has an upper limit Tu and a lower limit TI. This is provided to ensure the durability and quality of the fluid and the characteristics of the flow rate control valve, and the elevator must be controlled to operate within this temperature range. That is, the lower limit T, the lower temperature region (I
I), the upper limit of T, and the higher temperature range (III), the elevator operation is suspended. Further, in order to avoid stopping the operation of the elevator, heating may be performed in the region (IV) where temperature is lower than T, and cooling may be performed in the region (V) where the temperature is higher than To. Further, a setting such as a warning may be provided to indicate that it is abnormal and dangerous for the fluid temperature to exceed 12.

Conventionally, it has been customary to use inexpensive temperature switches to set these temperatures. Although temperature switches are inexpensive, they are expensive as a whole because there are many of them, and the set temperature is fixed.

In the present invention, the temperature control device 11 is controlled by the output of the temperature detector 8 for controlling the speed of the rider. That is, the confirmation shown in the third vg is performed for the elevator operation command,
Actual operation will be carried out after all conditions permit operation. For example, an alarm is issued for region (VI), a shutdown command is issued for regions (II) and (m), a heating command is issued for region (IV), a cooling command is issued for region (V), and a control valve is issued only when the region is in region (1). A command is transmitted to the control device 13 to operate the elevator. The W notification/operation suspension is processed by the control device 12 itself, and the user is informed accordingly. Heat again.

Regarding cooling, the contents are transmitted to the temperature control device 11. Each control device that receives this information operates and controls each device according to a preset program.

[Effects of the Invention] According to the fluid pressure elevator of the present invention, a plurality of temperature switches can be omitted, cost reduction and space saving can be realized, and since the temperature detector 8 continuously detects the fluid temperature, the To , TII, Tc.

The temperature range such as T, , T, etc. can be set arbitrarily. Furthermore, it is safe because it can be confirmed that there is no abnormality in the elevator operation immediately before the elevator operation. Furthermore, if the program is programmed to constantly check the area, the condition of the elevator will be constantly monitored, and abnormalities can be detected early.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a fluid pressure elevator according to the present invention, FIG. 2 is a diagram for explaining temperature setting, and FIG. 3 is a flowchart diagram for explaining an elevator control method. DESCRIPTION OF SYMBOLS 1... Passenger car, 2... Fluid pressure ram, 5... Flow rate control valve, 6... Pump, 8... Temperature detector, 11...
- Temperature control device, 12... Operation control device, 13...
Control valve control device. Figure 1: Country Z

Claims (1)

[Claims] 1. A fluid pressure elevator driven by supplying and discharging pressure fluid to a fluid pressure ram, which is controlled by a flow control valve that is controlled by feedback of an output signal from a temperature sensor. The fluid pressure elevator 2 is characterized in that the output signal of the temperature detector is supplied to a control device that controls fluid temperature, and the fluid pressure elevator 2 searches for a corresponding temperature range according to a predetermined program and responds accordingly. The hydraulic elevator according to claim 1, characterized in that the command is transmitted to another control device.