JPH09278307A - Safety device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the sudden stop and operating failure of an elevator caused by the action of tension pulley switches. SOLUTION: An elevator with a tension pulley weight 8 provided at the lowest pert of an elevator shaft so as to impart tension to a governor rope 5 is provided with an upper side tension pulley switch 10A provided on the upper side of the lowest part of the elevator shaft so as to detect the position of the tension pulley weight 8, a tower side tension pulley switch 10B provided on the tower side of the lowest part of the elevator shaft so as to detect the position of the tension pulley weight 8, and a control device 13 for detecting the action time difference between the upper side tension pulley switch 10A and the lower side tension pulley switch 10B and controlling the elevator according to the time difference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator equipped with a tensioning wheel that applies tension to a governor rope at the bottom of a hoistway and two tensioning wheel switches that detect the position of the tensioning wheel. Detects the time difference that the
The present invention relates to an elevator safety device that controls an elevator according to the time difference.

[0002]

2. Description of the Related Art The structure of a conventional elevator safety device will be described with reference to FIG. FIG. 4 is a diagram showing the entire conventional elevator and a governor-tensioned vehicle portion.

In FIG. 4, 1 is a hoisting machine sheave, 2 is a counter, 3 is a main rope, 4 is a governor sheave, 5 is a governor rope, 6 is a basket, 7 is a governor tensioned wheel, 8 is a tensioned vehicle weight, and 9 is a cam. 10 is a tension switch, 11 is a control panel, 1
2 is an emergency stop device.

Next, the operation of the conventional elevator safety device will be described.

The governor rope 5 is fixed to the car 6, and moves in accordance with the movement of the car 6 via the governor sheave 4 in the elevator machine room and the governor tension vehicle 7 at the lowest part of the hoistway. Further, a tension wheel weight 8 is attached to the governor tension wheel 7 in order to apply tension to the governor rope 5.

[0006] In a building where the ascending / descending stroke exceeds 100 m, generally, a tension wheel switch 10 for detecting the position of the tension weight 8 and checking that tension is constantly applied is provided.

In the elevator control panel 11, when the governor rope 5 is broken and the tensioner weight 8 falls on the floor surface of the pit in the hoistway, it becomes impossible to apply tension to the governor rope 5.
When the tension switch 10 is disengaged from the cam 9, an abnormality is detected, and the emergency stop device 12 is operated to stop the car 6 suddenly.

In the conventional method for detecting an abnormality in the tensioning device as described above, it is not necessary to stop the car 6 suddenly when the governor rope 5 expands or contracts due to changes in humidity over time. However, even if the car can be operated until the next maintenance if it is adjusted, the car 6 is suddenly stopped as in the case of an emergency, which causes a problem such as elevator operation failure.

[0009]

In the conventional elevator safety device described above, when the governor rope 5 is extended due to aging or the like, it is not necessary to stop the car 6 suddenly, but it is the same as in an emergency. Since the basket 6 is suddenly stopped, there is a problem in that elevator operation may be defective.

The present invention has been made in order to solve the above-mentioned problems. When the governor rope expands and contracts, the tension vehicle provided at the bottom of the hoistway moves up and down. It is an object of the present invention to obtain an elevator safety device that can control the elevator according to the situation so that it can be operated up to the limit of operability, and can prevent the elevator from suddenly stopping or being inoperable due to the tension switch operation.

[0011]

A safety device for an elevator according to the present invention is an elevator having a tensioning wheel weight for applying tension to a governor rope at the bottom of a hoistway,
An upper tension wheel switch provided above the lowermost part of the hoistway to detect the position of the tension vehicle weight, and a lower tensioning wheel switch provided below the lowest part of the hoistway to detect the position of the tension vehicle weight. And a control means for detecting a difference in operation time between the upper and lower lower sheave switches and controlling the elevator according to the time difference.

Further, in the elevator safety device according to the present invention, when the governor rope is contracted, the upper sheave switch moves to the upper sheave weight and reaches the first limit position where elevator operation is possible. It is sometimes installed so as to move away from the cam installed on the weight of the tension vehicle.

Further, in the elevator safety device according to the present invention, when the car is driven to the lowermost position of the hoistway at the limit position where the first elevator can operate, immediately before the collision with the governor-tensioned vehicle at the lower end of the governor rope. Is the position of.

Further, in the elevator safety device according to the present invention, the lower tension switch is moved downward by the extension of the governor rope, and the second tension switch reaches the second limit position where elevator operation is possible. When it is carried out, it is installed so as to move away from the cam installed on the weight of the tension car.

Further, in the elevator safety device according to the present invention, the limit position at which the second elevator can operate is set to a position immediately before the tensioned vehicle weight comes into contact with the pit floor surface in the hoistway.

Further, in the elevator safety device according to the present invention, the control means operates the emergency stop device when the time difference is short.

Further, in the elevator safety device according to the present invention, when the time difference is long, the control means operates the alarm device to operate the elevator to the elevator operation limit point.

Further, in the elevator safety device according to the present invention, the control means then operates the nearest floor stop device when the weight of the trolley reaches the limit position.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. The configuration of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a first embodiment of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 1 is a sheave of the hoisting machine, 2 is a counter, 3 is a main rope, 4 is a governor sheave, 5 is a governor rope, 6 is a basket, 7 is a governor tension wheel, 8 is a tension wheel weight, and 9 is a cam. , 11 is a control panel, and 12 is an emergency stop device.

In the figure, 10A is a tension switch installed on the upper side, 10B is a tension switch installed on the lower side, 13 is a control device, 14 is a nearest floor stop device, 15
Is an informing device.

Two tension wheel switches 10A and 10B are installed. When the governor rope 5 is affected by humidity and the governor rope 5 is contracted, the tensioner weight 8 moves upward, and the governor rope 5 moves to a limit position where elevator operation is possible, for example, when the car 6 is driven to the bottom of the hoistway, It is installed so that it will move away from the cam 9 when it reaches the position immediately before it collides with the tension vehicle 7.

Further, the tension switch 10B is used to extend the governor rope 5 to move the tension weight 8 downward, and to reach a limit position where elevator operation is possible, for example, just before the tension weight 8 touches the pit floor in the hoistway. It is installed so that it will come off the cam 9 when it reaches the position, and it will operate.

The control device 13 includes two tension switch 10
The difference between the operation times of A and 10B is detected, and the emergency stop device 12, the nearest floor stop device 14 or the notification device 15 is operated according to the time difference.

Next, the operation of the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing the operation of the first embodiment of the present invention.

When the governor rope 5 is cut and the tensioning vehicle weight 8 falls on the floor surface of the pit in the hoistway, the two tensioning wheel switches 10A and 10B are disengaged from the cam 9 at substantially the same time and operate.

On the other hand, when the governor rope 5 is stretched over time, the upper tension switch 10A is first disengaged from the cam 9, and after a certain period of time, the lower tension switch 10 is lowered.
B comes off the cam 9.

In other words, the operating time of the two tension switch 10A, 10B varies depending on the cause of movement of the tension weight 8. The controller 13 detects this difference in operating time, and when the time difference is short, the emergency stop device 12 is operated because the governor rope 5 is broken.

Also, the two tension switch 10A, 10B
If the difference in the operation time is long, it is because the governor rope 5 is elongated over time. Therefore, the alarm device 15 is operated to operate the elevator to the elevator operation limit point. After that, when the weight 8 of the trolley reaches the limit position, the nearest floor stop device 14 is operated.

When the lower tension control switch 10B operates within a reference time, for example, 10 seconds or less after the upper tension control switch 10A operates, the governor rope 5
Since it is in an abnormal state such as running out, the emergency stop device 12 is operated to suddenly stop the car 6 (steps 20 to 2).
4).

Even if the reference value is exceeded, for example, 10 seconds have passed since the upper tension switch 10A was operated,
When the lower tension switch 10B does not operate, the governor rope 5 has aged, so the alarm device 15 is activated to display it in the elevator control panel or notify the building management room or elevator maintenance company. Yes (Step 2
0-22, → 25-26).

After that, when the governor rope 5 continues to grow over time and the tension of the tension vehicle 8 is lowered, and the control device 13 detects that the lower tension wheel switch 10B has operated, the elevator operation limit is reached. That is, the nearest floor stop device 14 is operated (steps 20 to 22, → 2).
5, → 27).

When the tension wheel weight 8 moves upward, the lower tension wheel switch 10B is turned off while the upper tension wheel switch 10A is turned on. In this case, the alarm device 1 is used.
5 is operated to display the information in the elevator control panel or notify the building management personnel room or the elevator maintenance company (steps 20 to 21, → 28, → 26).

Further, when the tensioner weight 8 moves upward and the tensioner switch 10A on the upper side is turned off, since the tensioner switch 10B on the lower side has already been turned off, the emergency stop device 12 is operated. Suddenly stop the car 6 (Step 2
0-24).

According to the first embodiment, by changing the elevator control contents depending on the difference in the operating time of the two tension switch 10A and 10B, it becomes possible to operate according to the movement of the tension weight 8. It is possible to prevent the problem that the elevator cannot be started even if the elevator can be operated.

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a relay circuit according to the second embodiment of the present invention. The second embodiment is an example in which the relay circuit is used to configure the control device of the first embodiment to achieve the same effect.

In FIG. 3, A is the upper tension switch 1
0A is associated with the relay coil, B is a relay coil associated with the lower tension switch 10B, C is a timer relay,
D is an emergency stop relay, E is a notification relay, and F is a nearest floor stop relay. Note that Ab is a normally closed contact of the relay coil A, Ba is a normally open contact of the relay coil B, Bb is a normally closed contact of the relay coil B, Ca is a normally open contact of the timer relay C, and Cb is a normally closed contact of the timer relay C. It is a contact point.

The relay coil A is the upper tension switch 1
When 0A moves out of the cam 9, the excitation is cut off.
Further, the relay coil B is de-energized when the lower tension switch 10B is disengaged from the cam 9.

Next, the timer relay coil C is deenergized 10 seconds after the relay coil A is deenergized.

The emergency stop relay D is the tension switch 10
Within 10 seconds after A operates, tension switch 10B
Is activated when is activated, which causes the elevator to stop urgently.

The notification relay E is provided with a tension switch 10B even if 10 seconds have elapsed after the tension switch 10A was operated.
When is not working, it is excited and displayed in the elevator control panel or notified to the building management room or the elevator maintenance company.

The nearest floor stop relay F is the tension switch 1
10 seconds after OA operates, the tension switch 1
When 0B operates, it is excited and stops the elevator at the nearest floor.

With the above operation, it is possible to operate in accordance with the moving condition of the suspension vehicle weight 8 as in the first embodiment, and it is possible to prevent the problem that the elevator cannot be started regardless of the elevator operating state.

[0044]

As described above, the elevator safety device according to the present invention is provided above the lowermost part of the hoistway in an elevator having a tensioner weight for applying tension to the governor rope at the lowermost part of the hoistway. An upper tension wheel switch for detecting the position of the tension vehicle weight, a lower tension wheel switch provided under the lowermost part of the hoistway for detecting the position of the tension vehicle weight, the upper tension wheel switch and the lower tension wheel switch. Since it has a control means for detecting the difference in the operating time of the side stretcher switch and controlling the elevator according to this time difference,
It is possible to prevent the sudden stop of the elevator and the inoperability of the elevator due to the tension switch operation.

Further, in the elevator safety device according to the present invention, as described above, when the governor rope is contracted by the upper sheave switch, the sheave weight is moved upward to enable operation of the first elevator. Since it is installed so as to move away from the cam installed on the weight of the tension vehicle when the limit position is reached, it is possible to prevent the elevator from suddenly stopping and being unable to operate due to the tension switch operation.

Further, as described above, the elevator safety device according to the present invention, when the car is operated to the lowermost portion of the hoistway at the first elevator operation limit position, the governor tension at the lower end of the governor rope is set. Since the position is set immediately before the collision with the vehicle, there is an effect that it is possible to prevent the elevator from suddenly stopping or being inoperable due to the tension switch operation.

Further, in the elevator safety device according to the present invention, as described above, when the governor rope of the lower side tension switch extends, the weight of the tension car moves downward, and the second elevator operation is possible. When it reaches the limit position, it is installed so that it will move away from the cam installed on the weight of the tension car, so it is possible to prevent the sudden stop of the elevator due to the switch operation of the tension car and the effect of being unable to operate. Play.

Further, in the elevator safety device according to the present invention, as described above, the limit position at which the second elevator can operate is set to the position immediately before the tensioner weight comes into contact with the pit floor in the hoistway. Therefore, there is an effect that it is possible to prevent the elevator from suddenly stopping and being unable to operate due to the tension switch operation.

Further, in the elevator safety device according to the present invention, as described above, the control means operates the emergency stop device when the time difference is short. The effect of being able to prevent operation failure is exhibited.

Further, in the elevator safety device according to the present invention, as described above, when the time difference is long, the control means operates the alarm device to operate the elevator to the elevator operation limit point. It is possible to prevent the sudden stop of the elevator and the inoperability of the elevator due to the tension switch operation.

Further, in the elevator safety device according to the present invention, as described above, since the control means subsequently operates the nearest floor stop device when the weight of the tension vehicle reaches the limit position, the tension vehicle switch is activated. The effect of being able to prevent the sudden stop of the elevator and the inability to operate due to the operation is exhibited.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an elevator safety device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the elevator safety device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a relay circuit of an elevator safety device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional elevator safety device.

[Explanation of symbols]

1 hoisting machine sheave, 2 counter, 3 main ropes, 4
Governor sheave, 5 governor rope, 6 car, 7 governor tension car, 8 tension car weight, 9 cam, 10A tension car switch, 10B tension car switch, 11 control panel, 12 emergency stop device, 13 control device, 14 nearest floor stop device 1
5 Notification device.

Claims (8)

[Claims] 1. An elevator equipped with a tensioning wheel weight for applying tension to a governor rope at the bottom of the hoistway, wherein an upper tensioning wheel switch is provided above the bottommost part of the hoistway and detects the position of the tensioning wheel weight. A lower tension vehicle switch provided below the lowermost part of the hoistway to detect the position of the tension vehicle weight, and a difference in operating time between the upper tension vehicle switch and the lower tension vehicle switch is detected. And a control means for controlling the elevator according to the above. 2. The upper tension switch is a cam installed on the tension weight when the governor rope contracts to move the tension weight upward and reach a first elevator operation limit position. The elevator safety device according to claim 1, wherein the elevator safety device is installed so as to be operated outside. 3. The first elevator operable limit position is a position immediately before a collision with a governor-stretched vehicle at the lower end of the governor rope when the car is driven to the bottom of the hoistway. Item 2. An elevator safety device according to item 2. 4. The lower tension switch is configured to move the tension weight downward by extending the governor rope,
The safety device for an elevator according to claim 2, wherein the safety device is installed so as to move away from a cam installed on the weight of the suspension vehicle when the limit position where the elevator can be operated is reached. 5. The safety device for an elevator according to claim 4, wherein the limit position at which the second elevator can operate is a position immediately before the weight of the tensioned car touches the floor surface of the pit in the hoistway. 6. The elevator safety device according to claim 4, wherein the control unit operates an emergency stop device when the time difference is short. 7. The elevator safety device according to claim 4, wherein the control means operates the alarm device to operate the elevator to the elevator operation limit point when the time difference is long. 8. The elevator safety device according to claim 7, wherein the control means then operates the nearest floor stop device when the weight of the trolley reaches the limit position.