JPS6118687A - Safety device 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 invention] The present invention relates to a safety device for a hydraulic elevator.

[Technical background of the invention and its problems] In response to the demand for larger elevators, a plurality of hydraulic devices are connected in parallel to a hydraulic jack to which a car is connected, and these hydraulic devices are driven substantially simultaneously. There is a hydraulic elevator that raises and lowers a car at a predetermined speed.

Here, the hydraulic system refers to a series of units capable of supplying and storing oil, including an oil tank for storing hydraulic oil and a hydraulic pump.

Such a hydraulic elevator is adjusted so that a desired output is obtained when each hydraulic device exhibits a predetermined ability. Therefore, if one hydraulic system becomes abnormal, the balance in the amount of oil flowing in and out between the hydraulic systems and the balance in the amount of oil in the hydraulic tanks will be disrupted. As a result, not only the components of the hydraulic system are adversely affected, but also the speed of the car is reduced, resulting in poor service and poor riding comfort.

Conventionally, flow meters were installed in the piping of each hydraulic system to detect flow rate abnormalities, or liquid level gauges were installed in the oil tanks of each hydraulic system to detect oil level abnormalities, and when these abnormalities were detected, the elevator A safety device was used that outputs a stop command.

However, the flow meters and level gauges for this safety device are quite expensive, and it is difficult to add it to an existing elevator.
It was difficult to install it because it required major modifications.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and aims to provide an extremely inexpensive safety device for hydraulic elevators that has a simple configuration and can be easily applied to existing elevators.

SUMMARY OF THE INVENTION To achieve this object, the present invention connects a plurality of hydraulic devices to a hydraulic jack to which a car is connected, and raises and lowers the car by driving these hydraulic devices substantially simultaneously. The hydraulic elevator is characterized in that an elevator stop command is output when the time required for the car to travel between predetermined points exceeds a set predetermined time.

[Embodiments of the invention]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention.

In this safety device, a running time control relay 5, a deceleration position relay 108, a running time detection timer 11, and an operation control relay 13 are connected between DC power supply buses 3P and 3N.

A normally open contact 4a of an operation relay (not shown) and a normally open contact 10a of a deceleration position relay 10, which are energized during elevator operation, are connected in series to the running time control relay 5, and the normally open contacts 1. A normally open contact 5a of the running time control relay 5 is connected in parallel to Oa.

Next, the deceleration position relay 10 includes a parallel circuit of ascending direction deceleration switches 6a, 6b, 6c, etc., each of which detects the car for deceleration immediately before the stop floor when the car ascends. In addition to being connected in series with a normally open contact 8a of an up-direction relay (not shown) which is energized when the car is going up, a down-direction relay is connected in series to detect the car for deceleration just before the stop floor when the car is going down. Deceleration switch 7m, 7b, 7c...
... and a normally open contact 9a of a descending relay (not shown) which is energized when the car descends are connected in series.

The running time detection timer H also includes a normally open contact 4b of the driving relay and a normally closed contact 5b of the running time control relay 5.
are connected in series, and the normally open contacts of this running time detection timer are connected in parallel to these series contact circuits.

Next, the operation control relay 13 is connected in series with a safety switch group 12 including a normally closed contact (hereinafter, normally open contacts and normally closed contacts are simply referred to as contacts) of the running time detection timer 11 and a final switch. ing.

The operation of this embodiment configured as described above will be explained below with reference to FIG. 2, which shows the relationship between the travel distance and speed of the car.

First, as shown in Fig. 2, the car starts and stops according to the traveling pattern indicated by the polygonal line IL of acceleration, constant speed, and deceleration. If not, a travel pattern shown by the polygonal line 2L will be drawn.

Then, when the car that has landed at point Pl heads toward point 23 on the upper floor, an operation relay (not shown) is energized and contact 4a
, 4b are closed. Since the contact 10a of the deceleration position relay 10 is connected in series to the contact 4a, the travel time control relay 5 is deenergized, but the travel time detection timer 11 is activated by closing the contact 4b.

Next, when the car reaches point 22 at which it starts decelerating, the upward deceleration switch 6a is closed, and at this time, since the upward relay (not shown) is energized, the contact 8a is also closed.

Therefore, when the car reaches the 22nd point, the deceleration position relay 10 is energized, and at the same time, the running time control relay 5 is energized by closing the contact 10a, and is self-retained by the contact 5a.

Further, since the contact point 5b of the running time control relay 5 is opened, the excitation circuit of the running time detection timer 11 is cut off and the running time detection timer 11 returns to its original state.

Here, the running time detection timer 11 indicates that the car is normally at point P.
It is set slightly larger than the time required to reach point P2 from point P2. That is, assuming that the constant speed traveling distance is 81, the acceleration traveling distance is 82, the acceleration is α, and the speed at constant speed is VHl, the set value T1 is determined as shown in the following equation.

Therefore, if the car runs normally and the time is less than T1, 22
When this point is reached, even if the running time detection timer 11 operates, the contact 11a remains open and the contact 11b remains closed.

On the other hand, if the vehicle travels in the pattern shown by the polygonal line 2L in FIG. Contact 11a closes and holds itself due to time-up, and operation control relay 13 is deenergized by opening contact 11b. That is, an elevator stop command is output.

In this way, when driving is stopped as a result of abnormal driving, or when driving is aborted even during normal driving, contacts 4 & of the driving relay are opened, so driving time control relay 5 is deenergized. Ru.

The above has been explained when the car is going up, but when the car is going down, the contact 9a of the down direction relay and the down direction deceleration switch 7
The elevator stop command can be outputted in substantially the same manner as described above.

In addition, the deceleration switch in the ascending direction a, 6b, 6c...
...If the number of floors at which the elevator car stops is K, a total of ~1 deceleration switch is provided corresponding to each floor except the bottom floor, and similarly, deceleration switches 7a, 7b, 7c, etc. in the descending direction are provided. ... is provided in total by -1 corresponding to each floor except the top floor.

Therefore, in order to detect that the time it takes for a car to travel to an adjacent floor is too long, the travel time detection timer 11 can be set accordingly. The running time detection timer 11 can be set to a long time depending on the required time. In other words, according to the configuration shown in FIG. Just by setting it, it can be applied to most driving modes.

In the above embodiment, the time from when the operation relay is energized to when the deceleration switch operates while the car is on the floor is detected, but in other cases, when the hydraulic system is normal, If the time required to travel is known in advance, the time required between two other points may be detected.

In addition, the above embodiments mainly include relays, limit switches,
Although the present invention is constructed using a timer or the like, other switching elements, detection elements, time counting devices, etc. may be used to perform the same functions as those described above, as long as they can perform the same functions.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, when the time required for the car to travel between predetermined points becomes longer than the time set on the assumption that the hydraulic system is normal, the hydraulic system Since the structure is configured to determine abnormality, the structure is significantly simplified compared to conventional devices that use flowmeters and liquid level meters, and it can be easily added to existing elevators, at a significant cost. This has the effect of being able to lower the target.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and Figure 2 is a diagram showing the relationship between the travel distance and speed of the car, in order to explain the operation of the embodiment. 5... Running time control relay, 6a, 6J6c, 7a, 7b, 7cm deceleration switch, 1
0...Deceleration position relay, 1]... Regular travel time detection timer, J3... Operation control relay.

Claims (1)

[Claims] 1. A hydraulic elevator in which a plurality of hydraulic devices are connected to a hydraulic jack to which a car is coupled, and the car is raised and lowered by driving these hydraulic devices substantially simultaneously, in which the car is moved between predetermined points. A safety device for a hydraulic elevator, characterized in that when the time required for the car to travel exceeds a predetermined set time, a command to stop the elevator is output. 2. The safety device for a hydraulic elevator according to claim 1, wherein the predetermined points are a starting position of the car and a deceleration start position for the next stop.