WO2019130425A1

WO2019130425A1 - Elevator

Info

Publication number: WO2019130425A1
Application number: PCT/JP2017/046643
Authority: WO
Inventors: 由子宮崎
Original assignee: 三菱電機株式会社
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2019-07-04

Abstract

An elevator provided with a car 1 moving in a hoistway and a counterweight 2 balancing the weight of the car, comprising: a detector 10 that has a photoelectric distance sensor 10a and is affixed to the floor surface 100a of the hoistway; and a detectable object 11 that is provided to the car and/or the counterweight so as to face the detector 10. If the distance between the detector 10 and the detectable object 11 as measured by the photoelectric distance sensor 10a falls below a preset reference value, the elevator stops operating.

Description

Elevator

The present invention relates to elevators, and more particularly to the detection of the elevator car and the stretch of a rope that lifts a counterweight.

Conventionally, there is a detection device provided with position detectors in both the elevator car and the counterweight, and comparing the time difference between when both position detectors start operation with the value of the rotary encoder to grasp the elongation of the rope (for example, Patent Document 1). In addition, there is a detection device which is provided at the lower part of the counterweight with an elastic body capable of coming into contact with a shock absorber or the floor surface of a hoistway and detecting the extension of the main rope using the expansion amount of this elastic body (for example, patent Reference 2).

JP-A-5-262474 JP-A-5-24763

However, in such a detection device, a car or a counterweight is connected to an apparatus installed on a floor surface of a hoistway or the like to continue normal operation during detection of rope extension and until rope trimming is performed. There was a risk of contact with the elevator causing failure.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the failure of an elevator caused by the extension of a rope as compared with the prior art.

An elevator according to the present invention is an elevator provided with a car moving in a hoistway and a balance weight to be balanced with the weight of a car, which has a photoelectric distance sensor and is provided on the floor surface of the hoistway. And a detection object provided opposite to the detector on at least one of the car and the counterweight, and the distance between the detection object and the detector measured by the photoelectric distance sensor is predetermined. It is characterized by stopping operation, when becoming less than the reference value.

Another elevator according to the present invention is an elevator equipped with a car moving in the hoistway, a counterweight for balancing with the weight of the car, and a hoist, and having a photoelectric distance sensor and moving up and down A detector provided on the floor of the road, a detection object provided opposite to the detector on at least one of the car and the counterweight, a rotary encoder for measuring the number of revolutions of the hoist, a hoist And a memory in which heights of counterweights corresponding to the number of rotations are pre-recorded, and the distance between the detector and the detection object measured by the photoelectric distance sensor is measured by the rotary encoder. It is characterized by stopping operation, when it is less than the height of the balance weight recorded on the memory corresponding to a number.

According to the present invention, since the elevator is stopped when the extension of the rope of the elevator is detected, it is possible to reduce the failure of the elevator due to the extension of the rope as compared with the prior art.

The schematic block diagram of the elevator concerning Embodiment 1 The schematic block diagram of the pit vicinity of the elevator concerning Embodiment 1 FIG. 6 is a diagram showing the relationship between a detected object, a detector, and a control panel in Embodiment 1 The flowchart which shows the operation for the elevator concerning Embodiment 1 to detect the extension of a rope The flowchart which shows the operation for the elevator concerning Embodiment 2 to detect the extension of a rope The flowchart which shows the operation | movement for the elevator which concerns on Embodiment 3 to detect elongation of a rope

Hereinafter, an embodiment for carrying out the present invention will be described. In addition, the same code | symbol is attached | subjected and demonstrated to an identical or similar structure.

Embodiment 1
An elevator according to Embodiment 1 of the present invention will be described using FIG. 1 to FIG.

FIG. 1 is a schematic block diagram of an elevator. As shown in FIG. 1, the elevator comprises a cage 1 moving up and down in the hoistway 100, a counterweight 2 provided to balance the weight of the cage 1, a cage 1 and a counterweight 2 Rope 3 supporting fishing via car 4, hoist 5 for driving sheave 4, return car 6, compen cable 7 suspended between lower part of car 1 and lower part of counterweight 2, buffer 8, elevator Control panel 9 of FIG.

In the upper part of the hoistway 100, a machine room 101 in which the hoisting machine 5 is installed is provided, and in the lower part of the hoistway 100, a pit 102 of a predetermined depth is provided.
Here, an elevator having a machine room 101 will be described, but the present invention can also be applied to a machine room-less elevator in which the hoisting machine 5 is installed in the hoistway 100.

FIG. 2 shows the configuration of the elevator near the pit 102.
In order to measure the distance between the floor surface 100 a of the hoistway and the counterweight 2, a detector 10 is provided on the floor surface 100 a of the hoistway, and a detection object 11 is provided on the side of the counterweight 2.
The compensating cable 7 may connect the car 1 and the counterweight 2 directly as shown in FIG. 1 or may connect the same via the compensating pulley 7a as shown in FIG.

The detector 10 is fixed at a position not in contact with the counterweight 2 and the compensating cable 7, that is, on the side different from the side of the shock absorber 8 from which the compensating cable 7 is suspended. The detection object 11 is fixed to the side surface of the counterweight 2 so that the bottom surface of the detection object 11 is the same height as the bottom surface of the counterweight 2. For this reason, the distance between the floor surface 100 a of the hoistway and the detection object 11 is equal to the distance between the floor surface 100 a of the hoistway and the counterweight 2.
If the counterweight 2 is sufficiently larger than the shock absorber 8, the counterweight 2 may be used instead of the detection object 11.

The detector 10 is connected to the control panel 9 of the elevator. In addition, the detector 10 is a photoelectric distance sensor 10a for detecting the distance to the object, the height of the counterweight 2 obtained from the control panel 9 (height of the counterweight 2 from the floor 100a of the hoistway) and the photoelectric It includes a detection circuit 10b that detects the extension of the rope 3 using the distance detected by the distance sensor 10a.

In the detection circuit 10b, the distance between the floor surface 100a of the hoistway and the detection object 11 is set in advance as a predetermined value as the distance at which the elevator can be operated safely. If the distance detected by the photoelectric distance sensor 10a is less than this predetermined value, the rope 3 is extended, so the detection circuit 10b outputs a stop signal to stop the traveling of the car to the control panel 9 of the elevator.

FIG. 3 shows the relationship between the detection object 11, the detector 10, and the control panel 9 of the elevator.
The control panel 9 of the elevator includes an I / O substrate 9 a that exchanges signals with the detector 10, and supplies power to the detector 10. For example, when a car stop signal is input from the detector 10 to the I / O board 9a, the control panel 9 reports an elevator abnormality signal to an external monitoring device (not shown) or the like to stop the elevator. Also, upon receiving information on the height of the counterweight 2 from the control panel 9, the I / O substrate 9 a outputs a height signal indicating the height of the counterweight 2 to the detector 10.

The photoelectric distance sensor 10a of the detector 10 includes a light emitting element such as a laser and a light receiving element such as a photodiode. The photoelectric distance sensor 10a irradiates light from the light emitting element to the detection object 11, and measures the diffuse reflection light from the detection object 11, whereby the distance L between the photoelectric distance sensor 10a and the detection object 11 ie the floor of the hoistway The distance between the face 100a and the counterweight 2 is detected.
When the car 1 stops at the top floor, the photoelectric distance sensor 10a detects that the distance L is equal to or greater than a preset reference value in the normal state in which the rope 3 is not stretched. On the other hand, if the rope 3 is in a stretched state, the distance L detected by the photoelectric distance sensor 10a is smaller than the reference value. In this case, the detector 10 outputs a car stop signal to the elevator control panel 9.

Here, the operation in the case where the elevator according to the first embodiment detects the extension of the rope 3 will be described using the flowchart of FIG. 4.
In step S1, the control panel 9 determines whether the elevator car 1 is on the top floor. If the car 1 is on the top floor, the process proceeds to step S2 to cause the detector 10 to measure the distance L to the detection object 11 and to detect whether the distance L is greater than or equal to a reference value (here assumed to be 1 m). . In step S2, if the distance L is equal to or greater than the reference value (L において 1 m), the process proceeds to step S3. At this time, since the detector 10 does not transmit a car stop signal to the control board 9, the control board 9 causes the elevator to continue normal operation and ends the flow. If it is determined in step S1 that the car 1 is not on the top floor, the process proceeds to step S3 to cause the elevator to continue normal operation, and the flow is ended.

In step S2, if the distance L is less than the reference value (L <1 m), the process proceeds to step S4, and the detector 10 outputs a car stop signal to the control board 9. When the control board 9 receives a stop signal from the detector 10, the control board 9 determines that rope extension has been detected, and sends a signal to the monitoring device etc. to notify that rope extension has been detected. The member is notified, the elevator is stopped (step S5), and the flow is ended.

The elevator may be stopped after the passenger is dismounted between step S4 and step S5, and the car 1 is closed to travel to the lower floor. In this case, the risk of the elevator 1 failing and the car 1 falling can be reduced.

Further, although the case where the detection object 11 is attached to the counterweight 2 has been described here, the extension of the rope may be detected by attaching to the car 1 instead of the counterweight 2. In this case, the detector 10 is fixed to the floor surface 100 a of the hoistway so as to face the detection object 11 attached to the car 1.

Thus, in the elevator according to the first embodiment, the bottom of the detector 10 fixed to the floor surface 100 a of the hoistway and the bottom of the counterweight 10 at the same position as the bottom of the counterweight 2 are at the same height. And a detection object 11 fixed to the When the distance L between the detector 10 and the detection object 11 is less than a predetermined reference value, that is, when the distance from the floor surface 100 a of the hoistway of the counterweight 2 is shorter than the predetermined reference value , Stop the elevator. For this reason, a failure of the elevator which occurs when the car 1 or the counterweight 2 comes into contact with the equipment installed on the floor surface 100a of the hoistway from the detection of the extension of the rope until the trimming of the rope is performed, It is possible to reduce the failure of the elevator caused by the stretched rope 3 being caught in the equipment of the elevator.

Second Embodiment
An elevator according to Embodiment 2 of the present invention will be described with reference to FIG.

In the first embodiment, the elevator is stopped when the distance from the floor surface 100 a of the hoistway of the counterweight 2 is smaller than the reference value. If the rope extension is detected early, a failure of the elevator which occurs when the car or the counterweight comes into contact with the equipment installed on the floor of the hoistway, and a failure of the elevator which occurs when the stretched rope gets tangled in the equipment of the elevator, Risk is relatively low. For this reason, in the second embodiment, when the stretch of the rope is within the predetermined range, the operation speed of the elevator is decreased and the operation is continued, and when the stretch of the rope becomes the predetermined range or more, the elevator is stopped. The details will be described below.

The configuration of the elevator according to the second embodiment is the same as that of the first embodiment, so the description will be omitted.
Here, the operation in the case where the elevator according to the second embodiment detects the extension of the rope 3 will be described using the flowchart of FIG.

In step S11, the control panel 9 determines whether the elevator car 1 is on the top floor. If the car 1 is on the top floor, the process proceeds to step S12 to make the detector 10 measure the distance L to the detection object 11 and whether the distance L is equal to or greater than a first reference value (assumed here as 1 m) To detect If it is determined in step S12 that the distance L is equal to or greater than the first reference value (L ≧ 1 m), the process proceeds to step S13. At this time, since the detector 10 does not transmit a car stop signal to the control board 9, the control board 9 causes the elevator to continue normal operation and ends the flow. Also when it is determined in step S11 that the car 1 is not on the top floor, the process proceeds to step S13 to cause the elevator to continue normal operation, and the flow is ended.

In step S12, if the distance L is less than the first reference value (L <1 m), the process proceeds to step S14, and the detection circuit 10b of the detector 10 detects the distance L as the second reference value (here 0.5 m). It is determined whether the distance L is within a predetermined range (0.5 m <L <1 m) or not.

If the distance L is larger than the second reference value (L> 0.5 m) in step S14, it is determined that the extension of the rope 3 is within the predetermined range, and the process proceeds to step S15. In step S15, the detector 10 outputs a low speed signal instructing the control panel 9 to operate the elevator at a speed lower than the rated speed, and the process proceeds to step S16.
A control may be added between step S15 and step S16 to prohibit the car 1 from traveling to the top floor. By adding such control, it is possible to further reduce the risk of failure of the elevator due to the extension of the rope 3.

In step S16, the control panel 9 instructs the elevator to operate at a speed slower than the rated speed during normal operation, and the process proceeds to step S17. In step S17, the control panel 9 sends a signal to the monitoring device or the like to notify that the extension of the rope 3 is within the predetermined range to notify the administrator or maintenance worker that the extension of the rope has been detected, and the flow ends. Do. The manager or maintenance worker who has received the notification dispatches a worker to the site to cut the rope 3.

In step S14, if the distance L is equal to or less than the second reference value (L ≦ 0.5 m), the process proceeds to step S18. At this time, the detector 10 outputs a car stop signal to the control board 9. When the control board 9 receives the stop signal from the detector 10, the control board 9 determines that the rope elongation is detected to be less than the second reference value, and detects that the rope elongation is detected by the monitoring device or the like. Send a signal to notify and notify manager and maintenance personnel. Thereafter, the elevator is stopped (step 19), and the flow is ended.

The elevator may be stopped after the passenger is dismounted between step S18 and step S19 and the car 1 is closed to travel to the lower floor. In this case, the risk of the elevator 1 failing and the car 1 falling can be reduced.

Further, as described in the first embodiment, instead of attaching the detection object 11 to the counterweight 2, it may be attached to the car 1 to detect the extension of the rope. In this case, the detector 10 is fixed to the floor surface 100 a of the hoistway so as to face the detection object 11 attached to the car 1.

As described above, since the elevator according to the second embodiment also has the same configuration as the first embodiment, the car 1 or the counterweight 2 is in the period from when the elongation of the rope is detected until the trimming of the rope is performed. It is possible to reduce the failure of the elevator caused by contacting the equipment installed on the floor surface 100a of the hoistway and the failure of the elevator caused by the stretched rope 3 being caught in the equipment of the elevator.

In the elevator according to the second embodiment, when the distance L between the detector 10 and the detection object 11 is within a predetermined range, that is, the elongation of the rope 3 is a predetermined range. If it is inside, the elevator is operated at a speed lower than the rated speed at the normal time, and the manager and maintenance personnel are informed that the rope extension has been detected. As described above, when the stretch of the rope is detected without causing any problem in the safe operation of the elevator, the operation of the elevator is continued. Therefore, it is possible to reduce the risk of the elevator failure and to suppress the decrease in the elevator operation efficiency.

Third Embodiment
An elevator according to Embodiment 3 of the present invention will be described with reference to FIG.

In the first and second embodiments, it is determined whether or not the rope is stretched when the car is on the top floor. In the third embodiment, the extension of the rope is detected at an arbitrary timing without being limited to the case where the car is on the top floor. The details will be described below.

The configuration of the elevator according to the third embodiment is substantially the same as that of the first embodiment, so only differences will be described.
In the third embodiment, in addition to the configuration of the first embodiment, a rotary encoder (not shown) for measuring the number of revolutions of the hoisting machine 5 and the height (detection of the counterweight 2 corresponding to the number of revolutions of the hoisting machine 5 The value obtained by correcting the height from the floor surface 100a of the container 10, which is hereinafter referred to as L2), is provided with a memory (not shown) recorded in advance. The rotary encoder and the memory are each connected to the control board 9. The rotary encoder measures the number of revolutions of the hoist according to a command from the control board 9 and outputs the result as a signal to the control board 9.

Here, the operation in the case where the elevator according to the third embodiment detects the extension of the rope 3 will be described using the flowchart in FIG.
In step S21, the control panel 9 instructs each of the rotary encoder and the detector 10 to measure the number of revolutions of the hoisting machine 5 or the distance L between the detector 10 and the detection object 11. In step S22, the rotary encoder which receives the command from the control panel 9 measures the number of revolutions of the hoisting machine 5 and transmits the result to the control panel 9. Further, the detector 10 receiving the command from the control panel 9 measures the distance L between the detector 10 and the detection object 11 and transmits the result to the control panel 9.

In step S23, the control board 9 reads from the memory the height L2 of the counterweight 2 corresponding to the number of revolutions of the hoisting machine 5 acquired from the rotary encoder.

In step S24, the control panel 9 compares the height L2 read from the memory with the distance L acquired from the detector 10, and determines whether the height L2 is equal to or greater than the distance L. If the distance L detected by the detector 10 is equal to or greater than the height L2 read from the memory, it is determined that the rope 3 is not stretched, and the elevator is allowed to continue normal operation (step S25), and the flow is ended. If the detected distance L is less than the height L2 read from the memory, the control panel 9 sends a signal to an external monitoring device or the like to notify the manager or maintenance worker of the detection of the rope elongation. Thereafter, the elevator is stopped (step S26), and the flow is ended.

If step S24 is performed while the car 1 is traveling, the car 1 may be stopped at the nearest floor between step S24 and step S26 to dismount the passenger. By adding such control, it is possible to reduce the risk of the passenger being involved in the failure of the elevator caused by the extension of the rope 3.
It is preferable that the nearest floor for stopping the car 1 is a lower floor than the position of the car 1 at the time of the determination of step S24. This is because the risk of elevator failure caused by the car 1 traveling on the top floor can be reduced.

Alternatively, after the car 1 is stopped at the nearest floor and the passengers are dismounted, the car 1 may be moved to the lower floor and the elevator may be stopped (step S26). In this case, the risk of the elevator 1 failing and the car 1 falling can be reduced.

Here, the case where the process proceeds to step S26 when the height L2 read from the memory in step 24 is less than the distance L of the detection result has been described, but as described in the second embodiment, the difference between the two is predetermined. If it is within the specified range, that is, if the extension of the rope 3 is within the predetermined range, the elevator is operated at a slower speed than the normal rated speed. The maintenance staff may be notified of the detection of the rope elongation. In this case, when the stretch of the rope becomes larger than a predetermined range, the control panel 9 sends a signal to an external monitoring device etc. to notify the administrator or maintenance worker that the stretch of the rope has been detected, and stop the elevator. Do. As described above, when the stretch of the rope is detected without causing any problem in the safe operation of the elevator, the operation of the elevator is continued. Therefore, it is possible to reduce the risk of the elevator failure and to suppress the decrease in the elevator operation efficiency.

When the car 1 is run at a low speed, control may be added to prohibit the car 1 from traveling to the top floor. By adding such control, it is possible to further reduce the risk of failure of the elevator due to the extension of the rope 3.

As described above, since the elevator according to the third embodiment also has the same configuration as that of the first embodiment, the car 1 or the counterweight 2 is detected from when the elongation of the rope is detected until the trimming of the rope is performed. Can reduce the failure of the elevator caused by contact with the equipment installed on the floor surface 100a of the hoistway, and the failure of the elevator caused by the stretched rope getting caught in the equipment of the elevator.

In addition, the elevator according to the third embodiment includes a rotary encoder and a memory. The height L2 of the counterweight 2 corresponding to the number of revolutions of the winding machine 5 measured by the rotary encoder can be read from the memory and compared with the distance L between the detector 10 and the detection object 11 at an arbitrary timing. Growth can also be detected early.

Reference Signs List 1 basket 2 counterweight 3 rope 4 sheave 5 hoist 6 return car 7 compen cable 7a compen pulley 8 shock absorber 9 control board 9a I / O board 10 detector 10a photoelectric distance sensor 10b detection circuit 11 detection object 100 hoistway 100a Shaft floor 101 machine room 102 pit

Claims

An elevator having a car and a counterweight for balancing with the weight of the car, the car moving within a hoistway,
A detector having a photoelectric distance sensor, provided on the floor of the hoistway;
At least one of the car and the counterweight is provided with a detection object provided opposite to the detector;
An elevator characterized by stopping operation, when distance between said detector measured by said photoelectric distance sensor and said detection object becomes less than a predetermined standard value.
Normal operation when the distance between the detector measured by the photoelectric distance sensor and the detection object is smaller than a first predetermined reference value and larger than a second predetermined reference value. Operate at a speed slower than the rated speed of
The elevator according to claim 1, wherein the operation is stopped when the distance between the detector measured by the photoelectric distance sensor and the detection object is equal to or less than the second reference value.
When the distance between the detector and the detection object measured by the photoelectric distance sensor is less than a predetermined reference value, the passenger is dismounted from the car and then the car is run to the lower floor to drive the car. The elevator according to claim 1, wherein the elevator is stopped.
An elevator comprising: a car which moves in a hoistway; a counterweight which balances with the weight of the car; and a hoist.
A detector having a photoelectric distance sensor, provided on the floor of the hoistway;
A detection object provided opposite to the detector on at least one of the car and the counterweight;
A rotary encoder for measuring the number of revolutions of the hoist;
A memory in which the height of the counterweight corresponding to the number of revolutions of the winding machine is prerecorded.
The distance between the detector measured by the photoelectric distance sensor and the detection object is less than the height of the counterweight recorded in the memory corresponding to the number of rotations of the winding machine measured by the rotary encoder An elevator characterized by stopping operation in case of.
The difference between the height of the counterweight recorded in the memory corresponding to the number of revolutions of the winding machine measured by the rotary encoder and the distance between the detector and the detected object measured by the photoelectric distance sensor When it is within a predetermined range, it operates at a speed slower than the rated speed during normal operation, and the distance between the detector and the detection object measured by the photoelectric distance sensor is recorded in the memory The elevator according to claim 4, wherein the operation is stopped if the height of the counterweight is less than the height of the counterweight, and the difference is larger than the predetermined range.
The distance between the detector measured by the photoelectric distance sensor and the detection object is less than the height of the counterweight recorded in the memory corresponding to the number of rotations of the winding machine measured by the rotary encoder 5. The elevator according to claim 4, wherein, in the case, the car is caused to travel to the lower floor after stopping passengers from the car and the operation is stopped.
The elevator according to claim 2 or 5, wherein traveling to the top floor of the car is prohibited when operating at a speed slower than the rated speed.
The elevator according to any one of claims 1 to 7, wherein when the operation is stopped, the abnormality of the elevator is notified to the outside.