JP2002154757A - Rope cut detecting device for counter weight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rope cut detecting device for a counter weight for detecting a malfunction when a rope for a counter weight of an elevator is cut. SOLUTION: This rope cut detecting device is formed of a detecting lever 11 always energized freely to be turned, a rotating roller 14 for supporting the tensile force of a rope 1 for a counter weight, and a detecting means 15 to be operated by a contact with a free end 11a of the detecting lever 11. In usual, the rope 1 for the counter weight moving in the vertical direction hinders the turning of the detecting lever 11, when the rope for the counter weight is cut, the free end 11a of the detecting lever 11 is turned by a push and brought in contact with the detecting means 15 to detect a cut of the rope 1 for the counter weight. This rope cut detecting device is desirably applied for a hydraulic elevator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator counterweight rope breakage detecting device. More particularly, the present invention relates to a rope cut detection device for a counterweight of a hydraulic elevator installed in a relatively narrow place such as a general home.

[0002]

2. Description of the Related Art Conventionally, in order to reduce energy consumption when an elevator is moved up and down, a counterweight is connected to an elevator car via a pulley by a rope, a wire, or the like. That is, the counterweight moves in a direction opposite to the movement of the car so as to cancel the weight of the car, and acts to reduce the load on the electric motor. However, when an abnormality such as the rope hanging the counterweight is cut or entangled, it is necessary to immediately detect the abnormality from the viewpoint of safety and equipment and to issue an alarm to the user.

[0003] As an elevator equipped with a means for detecting the above-mentioned abnormality, Japanese Patent Laid-Open Publication No. Hei 10-338434 discloses a method in which a thimble rod spring is provided at a joint between a counterweight rope and a suspension frame on which a car is placed. There is disclosed a technique of detecting a displacement of a thimble rod spring by a displacement sensor and detecting an abnormality of a counterweight rope. Japanese Patent Application Laid-Open No. 10-258976 discloses that a distance between the bottom surface of a tension weight and a floor surface is detected by a sensor, a displacement amount thereof is calculated by a calculation means, and an abnormality of a governor rope is automatically determined based on the obtained position data. An apparatus for detecting is disclosed. Further, JP-A-5-1785
No. 60 proposes a lifting type high pole provided with lifting and lowering prevention means for preventing rapid rise and fall of the car in case the counterweight rope is cut.

[0004]

However, the technology described in Japanese Patent Application Laid-Open No. H10-338434 is applied to a hydraulic elevator, particularly a general household elevator which is directly called a hydraulic type, in consideration of its structure. Have difficulty. Further, the technology described in JP-A-10-258076 is a technology for detecting an abnormality of a governor rope, and the technology described in JP-A-5-178560 is disclosed in
Since the technology relates to an elevating high pole that raises and lowers a mount on which various instruments are mounted along a pole erected on the ground, it is not directly related to the rope cut detection device for the counterweight of the hydraulic elevator.

In the above-mentioned hydraulic elevator, since a car is connected to a plunger operated by a hydraulic jack and the car is moved up and down, even if the rope for the counterweight connected to the car is cut, the load on the hydraulic equipment is reduced. Although it increases, there is no significant change in its operation. Therefore, when an abnormality such as a breakage of the counterweight rope occurs, it is necessary to immediately notify the user of the abnormal situation.

[0006]

SUMMARY OF THE INVENTION The present invention has been conceived under such circumstances, and when an abnormality such as a breakage of an elevator counterweight rope occurs, the abnormality is immediately corrected. It is an object of the present invention to provide a counterweight rope disconnection detection device capable of detecting and issuing an alarm to a user. To solve this problem, the present invention takes the following technical measures. That is, according to the present invention, a detection lever that is rotatable and constantly urged, a roller that freely rotates while supporting the tension of the counterweight rope, and a detection device that operates by contacting the free end of the detection lever Means,
Normally, the counterweight rope that moves up and down prevents the detection lever from rotating.However, when the counterweight rope is cut, the free end of the detection lever rotates by urging and moves to the detection means. Provided is an elevator counterweight rope disconnection detection device for detecting the disconnection of the counterweight rope upon contact.

In the above-described counterweight rope disconnection detection device, even if the counterweight rope connected to the elevator car is cut, the load on the hydraulic device is increased, but its operation hardly changes. It is suitably used for hydraulic elevators. That is, the counterweight rope which moves up and down normally prevents the rotation of the detection lever. However, when the counterweight rope is cut and released, the free end of the detection lever is attached. The device is rotated by the force to come into contact with the detection means, and the abnormality alarm device is activated. Therefore, when an abnormal situation such as the breakage of the counterweight rope occurs, it can be immediately detected and notified to the user.

It is preferable that the detection lever is biased by a spring. Preferably, the detection means is a contact type micro switch. If this microswitch is connected to an audio alarm device, the user can be notified by voice of the disconnection of the counterweight rope.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 1 is a side sectional view showing a schematic configuration of a hydraulic elevator in which a counterweight rope cutting detection device according to the present invention is incorporated. FIG. 2 is a cross-sectional view of the rope cutting detector A for counterweight shown in FIG. 1, and the reference numerals indicate the same members as those in FIG.
As can be clearly understood from FIG. 1, the counterweight rope 1 has a counterweight 2 suspended at one end thereof.
The other end is connected via a pulley 3 to a plunger 5 operated by a hydraulic jack 4 by a fastener 6. Further, the elevator car 7 is fixed to the plunger 5 via fixing means 8, and moves up and down in conjunction with the vertical movement of the plunger 5.

The counterweight rope cutting detector A of the present invention is fixed to a fixed surface 9 such as a wall surface, as shown in FIG. 1, and attached to the counterweight rope 1 after the direction change by the pulley 3. Also, FIG.
As can be clearly understood from FIG. 2, the detection lever 11 urged by the spring 10 is mounted on a frame 12 fixed to the fixing surface 9 so as to rotate about a fulcrum 13 as an axis. In a normal state, the freely rotating roller 14 is supported by an arm 16 fixed to the frame 12 and supports the tension of the counterweight rope 1, so that the counterweight rope 1
The rotation of the free end 11 a of the detection lever 11 is prevented by the tension of the detection lever 11, and does not come into contact with the detection means 15.

Normally, the counterweight rope 1
Is moved up and down smoothly by the rotation of the roller 14 in the opposite direction to the raising and lowering of the car. However, when the counterweight rope 1 is cut, the detection lever 11 is biased by the spring 10 The detection lever 11 rotates around the fulcrum 13 as an axis, and the free end 11 a of the detection lever 11 comes into contact with the detection means 15. At the same time as the contact, as the detection means 15, usually
The contact type microswitch used is operated, and the circuit of the abnormality alarm device B is turned ON. When, for example, a voice alarm device is used as the abnormality alarm device B, the user can immediately know the abnormality such as the disconnection of the counterweight rope 1 by the sound of a buzzer, a bell, or the like. FIG. 3 shows that the detection lever 11 in the counterweight rope disconnection detecting device A shown in FIG. 1 is rotated by the cutting of the counterweight rope, the micro switch is operated, and the circuit of the abnormality alarm device B is turned on. It is a sectional side view which shows the state which became.

As described above, the counterweight rope cutting detection device of the present invention is based on the simple principle of utilizing the tension of the counterweight rope. Therefore, the detection device itself is simple, and it is possible to immediately detect the breakage of the counterweight rope and notify the user of the abnormality. Therefore, the present invention can be particularly preferably applied to a hydraulic elevator often installed in a general home or the like.

[0013]

According to the present invention, there is provided an elevator counterweight rope cutting detection device which is rotatable and always urged, a roller which freely rotates by supporting the tension of the counterweight rope, and The detection means is activated by contact with the free end of the lever, and the counterweight rope which moves up and down in a normal state prevents the rotation of the detection lever, but when the counterweight rope is cut, The free end of the detection lever is rotated by the bias and comes into contact with the detection means to detect the breakage of the counterweight rope.

That is, in the normal condition, the counterweight rope cutting detecting device of the present invention moves up and down smoothly by the rotation of the roller, while the counterweight rope cuts when it is cut. The simple principle is that the free end of the detection lever is rotated by the bias of the spring to activate the detection means and turn on the circuit of the abnormality alarm device. Therefore, the structure of the device itself is very simple.

In addition, it is possible to immediately detect the breakage of the counterweight rope and notify the user of the abnormality. Therefore, if an abnormal alarm is issued by sound, for example, a buzzer, a bell, or the like, when installed in a general household or the like, the user can immediately know the abnormality and take subsequent measures, which is preferable for safety. Become.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a hydraulic elevator provided with a rope cut detection device for a counterweight of the present invention.

FIG. 2 is a cross-sectional view of the counterweight rope cut detection device of the present invention.

FIG. 3 is a side sectional view showing a state in which a detection unit is operated.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Counterweight rope 2 Counterweight 3 Pulley 4 Hydraulic jack 5 Plunger 6 Clasp 7 Basket 8 Fixing means 9 Fixing surface 10 Spring 11 Detecting lever 11a Detecting lever free end 12 Frame 13 Support 14 Roller 15 Detecting means 16 Arm A Detecting device for rope breakage for counterweight B

Claims (5)

[Claims] 1. An apparatus for detecting the cutting of a counterweight rope of an elevator, comprising: a detection lever that is rotatable and constantly urged; a roller that freely rotates by supporting the tension of the counterweight rope; The detection means is operated by contact with the free end of the detection lever, and the counterweight rope which normally moves up and down prevents the detection lever from rotating, but when the counterweight rope is cut, And a detecting means for detecting a break of the counterweight rope, wherein the free end of the detection lever is rotated by the bias and comes into contact with the detection means to detect the breakage of the counterweight rope. 2. The apparatus according to claim 1, wherein the elevator is a hydraulic elevator. 3. An apparatus according to claim 1, wherein the detection lever is biased by a spring. 4. The apparatus according to claim 1, wherein said detecting means is a contact type micro switch. 5. An apparatus according to claim 1, wherein said detecting means is connected to activate an audio alarm device.