JPH04333482A - Safety device for hydraulic elevator - Google Patents

Abstract

PURPOSE:To provide a safety device of a hydraulic elevator which can restore the operation stop condition of the hydraulic elevator based on the action of an emergency stop device due to sinking of an elevator cage to the normal condition simply at site. CONSTITUTION:It is provided with a push button 17 to energizare a safety confirming relay by pushing it, and an inching operation device 25 which is driven by operation of the push button at working of an emergency stop switch 11 and lifts an elevator cage up to the lowermost floor level at low speed. Consequently, dispatch of a maintenance engineer is unnecessary, the restoring work can be carried out simply at site and in a short time at low working cost, and a fall of service for users is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a hydraulic elevator that indirectly drives a car using a hydraulic jack.

0002

[Prior Art] In a hydraulic elevator, for example, when a power outage occurs and the car is stopped at the bottom floor for a long time,
Oil leakage may cause the plunger to sink, causing the car to descend further and land on the shock absorber. In preparation for such a case, this type of hydraulic elevator is equipped with a safety device, as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-235381. When the elevator is loosened, the emergency stop means of the safety device is activated and the car is held at the stopped position, and at the same time, the operation stop means is activated and the elevator is brought to a stopped state.

[0003] Conventionally, the manager of the building where the elevator is installed would know that the elevator had stopped operating due to the activation of such a safety device, and would notify the elevator service company, so that a maintenance engineer could come to the site. They were dispatched and carrying out restoration work. After the power supply is restored, the maintenance engineer confirms that the car has sunk due to the power outage, and short-circuits the contacts that have been opened due to the activation of the emergency stop means using a caterpillar clip. Then, by inching the elevator, which has been set to the operating state by short-circuiting the contacts, the car is raised to the level of the lowest floor. When the elevator car rises to the lowest floor level, the normal operation relay is energized, and the maintenance engineer removes the Minomushi clip from the contacts shorted by the Minomushi clip and returns the elevator from the stopped state to the normal operating state. was reinstated.

0004

[Problems to be Solved by the Invention] As mentioned above, restoration work of a hydraulic elevator from a state where the elevator has stopped operating due to the activation of an emergency stop device caused by a long power outage, for example, is relatively difficult because the cause is clear. It's easy. However, in the past, maintenance engineers from the elevator service company would go to the site to carry out restoration work in this case as well, which meant that the elevators would be left out of service for long periods of time, resulting in poor service to customers. was causing a decline in

The present invention was made in view of the current state of this type of hydraulic elevator as described above, and its purpose is to easily restore the stopped state of the elevator on site due to the operation of the emergency stop device. Our goal is to provide the best possible hydraulic elevator safety device.

[0006]

[Means for Solving the Problems] The above object is such that when the car sinks and collides with a shock absorber, the emergency stop means is activated to hold the car in a stopped state, and the car descent detection means In a hydraulic elevator safety device, a safety confirmation relay is deenergized by detecting subsidence of the car, and the deenergization of the safety confirmation relay activates an operation stop means to stop the operation of the elevator. a non-locking push button that energizes the safety confirmation relay; and an inching operation means that is driven by the operation of the push button when the car lowering detection means is activated, and that raises the car at a low speed to the lowest floor level. This is achieved by adopting a configuration that provides.

[0007]

[Operation] With this configuration, if the car sinks and collides with the shock absorber due to, for example, a long power outage, the emergency stop means is activated and the car is held in a stopped state. At the same time, when the car descent detection means detects that the car is sinking, the safety confirmation relay is de-energized, and the de-energization of the safety confirmation relay activates the operation stop means, and the elevator is placed in a non-operation state. In this state, even if the power is restored and the power is turned on, the descent detection means still detects the sinking of the car, the safety confirmation relay is deenergized, and the elevator is in a stopped state.

For example, when a manager of a building in which an elevator is installed operates a push button, a safety confirmation relay is energized, the inching operation means is activated, and the car is operated at low speed to ascend to the lowest floor level. Ru. and,
When the car reaches the lowest floor level, the elevator returns to normal operation.

[0009]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Here, FIG. 1 is a circuit diagram showing the circuit configuration of the embodiment, and FIG. 2 is an explanatory diagram showing the overall configuration of the embodiment. In FIG. 2, reference numeral 1 denotes a hoistway. A pit 2 is provided at the bottom of the hoistway 1, and a shock absorber 12 and a cylinder 3 of a hydraulic jack are disposed in the pit 2. A plunger 4 is inserted into the cylinder 3 so as to be freely removable and removable.
By pressurizing hydraulic oil into the cylinder 3 from a hydraulic unit (not shown), the plunger 4 is moved in the vertical direction. A pulley 5 is rotatably attached to the tip of the plunger 4, and a rope 7 is wrapped around the pulley 5. One end of the rope 7 is attached to a support piece 8 provided on the lower side of the car 6. The other end is fixed to a support piece 9 provided on the lower side of the cylinder 3. Also, car 6
A guide rail (not shown) that engages with the car 6 is vertically provided on the side of the car, and the plunger 4 is connected to the cylinder 3.
By moving in and out of the hoistway 1, the car 6 engages with a guide rail and moves upward or downward within the hoistway 1.

By the way, an emergency stop switch 11 and an emergency stop device 10 are fixedly installed at the bottom of the car 6. When an emergency situation occurs in which the rope 7 becomes loose or breaks, the emergency switch 11 will stop the rope 7 from loosening or breaking. When this is detected, the emergency stop device 10 is activated and grips the guide rail, thereby stopping and holding the car 6 at that position. Further, a side plate portion 14 is provided on the side of the car 6.
This side plate portion 14 pushes the limit switch 13 provided on the side wall of the hoistway 1 at the position where the car 6 contacts the shock absorber 12, and when the car 6 rises to the lowest floor position, the pushing is released. It's becoming like that. A machine room 15 is provided adjacent to the hoistway 1.
A control panel 16 is disposed at 5, and a non-lock type push button 17, which will be described later, is provided.

On the other hand, in the embodiment, as shown in FIG. 1, a normally closed contact 11b of the emergency switch 11 and a normally closed contact 2 of another safety detection switch (not shown) are connected between the DC power terminals P and N.
1b, 22b and the safety confirmation relay 23 are connected in series, and the normally open contact 17a of the non-locking push button 17 is connected in parallel to the normally closed contact 11b. Further, between the DC power terminals P and N, a normally open contact 23a of a safety confirmation relay 23, a normally closed contact 20b of a normal operation relay 20, which will be described later, and a normal operation device 24 are connected in series with each other. The normally open contact 2 of the normal operation relay 20 is connected between the connection point of the normally closed contact 23a and the normally closed contact 20b and the DC power supply terminal N.
0a and the inching driving device 25 are connected to each other in series. The normally open contact 13a of the limit switch 13 and the normal operation relay 20 are connected in series between the DC power terminals P and N.

In the above configuration, the safety confirmation relay 23
has the function of activating the normal operation device 24 by energizing the emergency switch 11 and other safety detection switches (not shown) when it is confirmed that they are all switched to a state where safe operation is possible, and the inching operation relay 20 has a function of operating the inching driving device 25 by its urging.

In an embodiment with such a configuration, the emergency stop device 10, the emergency stop switch 11, and the inching operation device 25
However, the safety confirmation relay 23 and the normally open contact 23a constitute the operation stopping means of the present invention, which respectively correspond to the emergency stop means, the car lowering detection means, and the inching operation means of the present invention.

Next, the operation of the embodiment having such a configuration will be explained.

When the car 6 is located above the lowest floor level and all the other safety detection switches (not shown) are switched to the safety confirmation side, the emergency stop switch 11 is in the open state, and as shown in FIG. Other safety detection switches not shown are also open. For this reason, the normally closed contact 11b is closed, and the normally closed contacts 21b and 22b are also closed, so that the DC power terminal P, the normally closed contact 11b, the normally closed contact 21b, and the normally closed contact 22b are closed.
, the safety confirmation relay 23 and the DC power supply terminal N form a closed circuit, and the safety confirmation relay 23 is energized. At this time, the limit switch 13 is open, the normally open contact 13a is open, the inching operation relay 20 is deenergized, and the normally closed contact 20b is closed. Therefore, safety confirmation relay 23
When energized, the normally open contact 23a closes, and the DC power terminal P
, normally open contact 23a, normally closed contact 20b, normal operation device 24
A closed circuit is formed between the terminal N and the DC power supply terminal N, the normal operation device 24 is activated, and the elevator is operated normally.

Next, for example, when a power outage occurs and the car 6 is stopped for a long time, the hydraulic oil in the cylinder 3 leaks little by little, causing the car 6 to sink, and eventually the car 6 becomes a shock absorber. Climb onto vessel 12. When the car 6 rides on the shock absorber 12, the rope 7 loosens, the emergency stop switch 11 closes, the normally closed contact 11b opens, and the emergency stop device 10 grips the guide rail, causing the car 6 to be lifted up.
is in a stopped state. At this time, the limit switch 13 is pushed by the side plate 14 of the car 6 which has sunk, and the normally open contact 13a is closed, so the inching operation relay 2
0 is energized.

By energizing the inching operation relay 20, the normally open contact 20a is closed and the normally closed contact 20b is opened.

When the power outage is restored in such a state, the manager of the building where the elevator is installed confirms that the power outage has been restored in the machine room 15 and presses the push button 17 to operate.
The normally open contact 17a is closed. By closing the normally open contact 17a, a closed circuit is formed by the DC power terminal P, the normally open contact 17a, the normally closed contact 21b, the normally closed contact 22b, the safety confirmation relay 23, and the DC power terminal N, and safety is confirmed. Relay 23 is energized. When the safety confirmation relay 23 is energized, the normally open contact 23a is closed, so the DC power terminal P and the normally open contact 3a are closed.
, the normally open contact 20a, the inching operation device 25, and the DC power supply terminal N form a closed circuit, and the inching operation device 25
becomes operational.

Then, the inching operation device 25 causes the car 6 to ascend at a low speed to the lowest floor level.
The emergency stop switch 11 is in the open state and the normally open contact 11
b is closed. Further, the limit switch 13 is in an open state, the normally open contact 13a is opened, the inching operation relay 20 is deenergized, the normally closed contact 20b is opened, and the normally open contact 2
0a opens. In this way, the car 6 rises to the lowest floor level and stops, and in this state, even if the caretaker releases the non-locking push button 17, the safety confirmation relay 23 is energized and the elevator stops. , and has been restored to a state where normal operation is possible.

According to this embodiment, even if the elevator has been stopped for a long time and the car 6 is in contact with the shock absorber 12 due to oil leakage, the push button 17 can be pressed in the machine room 15. By simply operating the elevator, you can quickly return the elevator to normal operation. As a result, the elevator outage time is shortened, service to customers is not degraded, and there is no need to dispatch maintenance engineers to the site, which is advantageous in terms of restoration work costs.

[0021]

[Effects of the Invention] As explained in detail above, in the present invention,
Even when the car sinks below the lowest floor level and the descent detection means is activated, the inching operation means is activated by simply operating the push button, and the car returns to the lowest floor level at low speed. Since the elevator is operated upward and quickly returns to normal operation, restoration work can be carried out quickly and at low cost without the need to dispatch maintenance engineers to the site, and there is no deterioration in service to customers.

[Brief explanation of drawings]

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

FIG. 2 is an explanatory diagram showing the overall configuration of an embodiment of the present invention.

[Explanation of symbols]

1 Hoistway 2 Pituto 3 Cylinder 4 Plunger 5 Pulley 6 Cart 10 Emergency stop device 11 Emergency switch 12 Buffer 13 Limit switch 17 Push button 20 Inching operation relay 23 Safety confirmation relay 24 Normal operation device 25 Inching device

Claims (1)

[Claims] [Claim 1] When the car sinks and collides with a shock absorber, an emergency stop means is activated to hold the car in a stopped state, and a car descent detection means detects the sinking of the car. In a hydraulic elevator safety device in which a safety confirmation relay is deenergized, and the deactivation of the safety confirmation relay activates an operation stop means to stop operation of the elevator, the safety confirmation relay is energized by a push operation. A hydraulic system characterized by having a non-locking push button and an inching operation means that is driven by the operation of the push button when the car lowering detection means is activated, and operates the car at a low speed to ascend to the lowest floor level. Elevator safety equipment.