JPS63196474A - Cage sinking-quantity detector for hydraulic type 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] The present invention relates to a car sinking amount detection device for a hydraulic elevator.

[Conventional technology]

In general, hydraulic elevators are, for example,
As shown in Publication No. 6074, when a lift command is issued, the motor starts and the hydraulic pump of the hydraulic power unit rotates.
Oil in the oil tank is fed by a hydraulic pump to a hydraulic cylinder via a lifting solenoid valve, and the car is raised together with the plunger. On the other hand, when a descending command is issued, the descending electromagnetic valve opens, and the weight of the car and plunger forces the oil in the hydraulic cylinder back into the oil tank, causing the car to descend together with the plunger.

If such a hydraulic elevator is operated for a long period of time, the sliding parts such as the gasket installed between the plunger and the hydraulic cylinder may wear out, the seat of the solenoid valve may become flattened, or the gasket may become damaged due to the heat of the oil. As a result, the oil in the hydraulic cylinder may leak, impairing the car's speed characteristics, or causing the car to sink abnormally while it is stopped.

Conventionally, in order to check the sinking caused by oil leakage, the car was stopped for, for example, one hour, and the distance the car sank during this period was measured using a ruler or the like. If the measured value of the amount of subsidence obtained in this way exceeds a predetermined value, it was determined that the amount of subsidence is abnormal.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, not only is it necessary for maintenance personnel to wait at the location while the car is stopped to measure the amount of subsidence, but the car also stops, causing a great deal of inconvenience to passengers. There was a problem with multiplying .

The purpose of the present invention is to provide a car sinking amount detection device that can effectively check the state of car sinking without requiring maintenance personnel to wait or causing a great deal of inconvenience to passengers due to the stoppage of the car. It is about providing.

[Means for solving problems]

In order to achieve this object, the present invention is provided with a counter device that detects how many times the car has sunk by a predetermined distance within a predetermined time after the car has stopped.

[For production]

After the car stops, the number of times the car sinks by a predetermined distance within a predetermined time is detected, and this is displayed by a counter change T.

Thereby, maintenance personnel can determine whether or not the sinking state of the car is abnormal simply by checking the counter device.

Therefore, it is possible to check for subsidence due to oil leakage in a short time, and there is no need for maintenance personnel to wait to measure the amount of subsidence or cause a great deal of inconvenience to passengers.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a hoistway, 2 is a hydraulic cylinder fixed at the bottom of the hoistway 1, 3 is a plunger inserted into the hydraulic cylinder 2, 4 is a car supported by the plunger 3, and 5 is a hydraulic cylinder fixed to the lower part of the hoistway 1. A hydraulic power unit consisting of a hydraulic pump, etc., 6 is an oil pipe connecting the hydraulic power unit 5 and the hydraulic cylinder 2, and when the hydraulic oil sent from the hydraulic power unit 5 enters the hydraulic cylinder 2 through the oil pipe 6, The plunger 3 is pushed up and the car 4 is raised. On the other hand, by returning the hydraulic oil in the hydraulic cylinder 2 to the hydraulic power unit 5 via the oil pipe 6, the car 4 is lowered together with the plunger 3. Reference numeral 7 denotes a gasket attached to the upper end of the hydraulic cylinder 2, and this gasket 7 prevents the hydraulic oil in the hydraulic cylinder 2 from leaking. 8 is the lowest floor landing, SL and S are detection objects attached to the wall of the hoistway l, such as limit switches, 9
is attached to car 4, and limit switch Sl.

1) is a cam that operates S2, 10 is a relay box attached to the wall of the hoistway 1, and 1) is a limit switch S1.
A wiring 12 connects S2 and the relay box 10, and 12 is another wiring connected to the relay box 10. The other end of this wiring 12 is connected to a display device 13 provided below the entrance of the lowest floor landing 8. ing.

In Figure 2, P and N are the positive power supplies, respectively.

The negative terminal T is a timer relay that starts operating when the limit switch S is closed, and K is a counter that starts operating when the limit switch S2 is closed before the timer relay T reaches a predetermined time.

Ka is a contact that is turned ON when the counter K operates a predetermined number of times, for example, 10 times.
Relay A is energized and contacts Aa are self-held at ONL. 13 is a display device that lights up when contact Ka is turned on.

However, now, when the car 4 is stopped at the lowest floor, the car 4 sinks and the cam 9 of the car 4 is activated by the limit switch S.
1, this limit switch Sl operates. With this operation, a circuit of P-3, -T-N is formed, and timer relay T starts counting. Then, when the car 4 sinks further within the predetermined setting time of the timer relay T and the limit switch S2 is activated by contact with the cam 9, a circuit of P-3t-'l''b KN is formed and the counter records one action.

When this operation is repeated a predetermined number of times, for example 10 times, the counter K
The contact Ka is turned on, and P-Ka -Cb-A-N
A circuit is formed, contact Aa is turned on, and relay A maintains itself. At the same time, a P-Ka-Cb-13-N circuit is formed and the display device 13 lights up. On the other hand, limit switch S2 turns ON outside the predetermined time of timer relay T.
However, since the contact Tb is turned off, the counter does not operate.

Therefore, maintenance personnel can detect abnormal conditions such as sinking of the car 4 by simply looking into the pit between the sills during inspection. Moreover, when the counter K operates a predetermined number of times,
Since the display device 13 is turned on, it is possible to reliably grasp the abnormal state. Furthermore, by providing a counter that can display the number of operations, abnormal conditions can be known more accurately.

Although the display device 13 is provided in the above embodiment, an abnormal state can be confirmed simply by checking the number of operations on the counter. Therefore, attachment of the display device 13 can be omitted if necessary.

Further, in the above embodiment, the display device 13 is provided below the entrance of the lowest floor landing 8, but it may be provided in the machine room, inside the car 4, or on the side of the entrance. Further, the limit switches S+ and St may be provided on the car 4, and the cam 9 may be provided on the ascending Kml wall. Furthermore, a proximity switch may be provided as a detection object, or an existing position detection switch may be used.

〔Effect of the invention〕

According to the present invention, maintenance personnel can simply check the number of operations on a counter or check the lighting of a display device.
You can check whether the condition of car sinking due to oil leakage is normal or abnormal. Therefore, there is an effect that maintenance personnel do not have to wait to measure the amount of subsidence, and there is no need for passengers to have to wait for the maintenance staff to measure the amount of subsidence, or to open a row of windows to passengers when the car is stopped.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a lower hoistway of a hydraulic elevator equipped with a car sinking amount detecting device according to an embodiment of the present invention, and FIG. 2 is an electrical diagram of the car sinking amount detecting device shown in FIG. It is a circuit diagram. DESCRIPTION OF SYMBOLS 1... Hoistway, 2... Hydraulic cylinder, 3... Plunger, 4... Car, 9... Cam, 13... Display device, K... Counter, S... S ! ...Limit switch (Detection Fig. 1 Fig. 2

Claims (2)

[Claims] (1) Hydraulic type in which the car is supported by a plunger of a hydraulic cylinder placed in the hoistway, and the car is raised and lowered via the plunger by controlling the amount of oil in the hydraulic cylinder. A car sinking amount detection device for a hydraulic elevator, characterized in that the elevator is provided with a counter device for detecting how many times the car has sunk a predetermined distance within a predetermined time after the car has stopped. (2) The car sinking of the hydraulic elevator according to claim 1, further comprising a display device that displays when the counter device operates a predetermined number of times, a predetermined number of times has been reached. Quantity detection device.