CN115413269A

CN115413269A - Elevator device

Info

Publication number: CN115413269A
Application number: CN202080099857.7A
Authority: CN
Inventors: 钉谷琢夫
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2022-11-29
Anticipated expiration: 2040-04-27
Also published as: WO2021220349A1; CN115413269B; JP7355231B2; DE112020007125T5; JPWO2021220349A1

Abstract

Provided is an elevator device capable of suppressing the generation of impact tension on a main rope. The elevator device is provided with: a car provided to be capable of ascending and descending inside a hoistway of an elevator; a counterweight that is provided so as to be able to ascend and descend inside the hoistway; a main rope that connects the car and the counterweight; a hoisting machine that applies a driving force or a braking force to the main ropes; a car emergency stop member effective to lower the car; a counterweight emergency stop member effective to lower the counterweight; and a safety monitoring device that, when detecting an abnormality that causes a decrease in the tension of the main rope, operates the car safety device or the counterweight safety device to suppress the swinging back of the car or the counterweight.

Description

Elevator device

Technical Field

The present invention relates to an elevator apparatus.

Background

Patent document 1 discloses an elevator apparatus. The elevator device actuates the brake or the emergency stop member according to the degree of the abnormality.

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication No. 2011-121726

Disclosure of Invention

Problems to be solved by the invention

However, the elevator apparatus described in patent document 1 does not take countermeasures when the car or the counterweight collides with the buffer. Therefore, when one of the car and the counterweight collides with the buffer, the other of the car and the counterweight jumps (jump). Then, an impulsive tension may be generated in the main rope.

The present invention has been made to solve the above problems. The invention aims to provide an elevator device capable of inhibiting impact tension on a main rope.

Means for solving the problems

An elevator device of the present invention includes: a car provided to be capable of ascending and descending inside a hoistway of an elevator; a counterweight that is provided so as to be able to ascend and descend inside the hoistway; a main rope that connects the car and the counterweight; a hoisting machine that applies a driving force or a braking force to the main ropes; a car emergency stop member that is effective for lowering the car; a counterweight emergency stop member effective to lower the counterweight; and a safety monitoring device that, when detecting an abnormality that causes a decrease in the main rope tension, operates the car safety device or the counterweight safety device to suppress the swing back of the car or the counterweight.

Effects of the invention

According to the present invention, when an abnormality that causes a decrease in the tension of the main rope is detected, the safety monitoring device operates the car safety stop member or the counterweight safety stop member to suppress the swing back of the car or the counterweight. Therefore, the generation of an impulsive tension on the main rope can be suppressed.

Drawings

Fig. 1 is a configuration diagram of an elevator apparatus according to embodiment 1.

Fig. 2 is a diagram for explaining example 1 of abnormality monitoring performed by the safety monitoring device of the elevator apparatus according to embodiment 1.

Fig. 3 is a diagram for explaining 2 nd example of abnormality monitoring by the safety monitoring device for an elevator apparatus according to embodiment 1.

Fig. 4 is a flowchart for explaining example 3 of abnormality monitoring by the safety monitoring device for an elevator apparatus according to embodiment 1.

Fig. 5 is a hardware configuration diagram of a safety monitoring device of an elevator apparatus according to embodiment 1.

Fig. 6 is a configuration diagram of an elevator apparatus according to embodiment 2.

Fig. 7 is a flowchart for explaining an example of abnormality monitoring performed by the safety monitoring device of the elevator apparatus according to embodiment 2.

Fig. 8 is a configuration diagram of an elevator apparatus according to embodiment 3.

Fig. 9 is a flowchart for explaining an example of abnormality monitoring performed by the safety monitoring device for an elevator apparatus according to embodiment 3.

Detailed Description

Embodiments are described with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals. Duplicate description of this section is appropriately simplified or omitted.

Embodiment 1.

In the elevator apparatus of fig. 1, a car 1 and a counterweight 2 of an elevator are installed inside an unillustrated hoistway.

The main ropes 3 connect the car 1 and the counterweight 2. The hoisting machine 4 is installed in a machine room not shown. The hoisting machine 4 is provided with a traction sheave 5 and a deflector sheave 6. A not-shown hoisting motor is disposed coaxially with the hoisting pulley 5. The traction sheave 5 and the deflector sheave 6 maintain a state in which the main rope 3 is wound. The brake 41a and the brake 41b are provided to the hoisting machine 4.

The car emergency stop member 11 is provided at a lower portion of the car 1. The counterweight emergency stop member 21 is provided at a lower portion of the counterweight 2.

The car buffer 12 is provided at the bottom of the hoistway. The car buffer 12 overlaps the car 1 on a horizontal projection plane. The car buffer switch 13 is provided to the car buffer 12. The counterweight buffer 22 is provided at the bottom of the hoistway. The counterweight buffer 22 overlaps the counterweight 2 on the horizontal projection plane. The counterweight buffer switch 23 is provided to the counterweight buffer 22.

The car position and speed sensor 14 is provided in an upper portion of the car 1.

The hoisting machine 4 applies a driving force or a braking force to the main ropes 3.

Specifically, in the hoisting machine 4, when the hoisting motor is rotationally driven, the hoisting sheave 5 rotates. When the traction sheave 5 rotates, the main ropes 3 move. When the main ropes 3 move, the car 1 and the counterweight 2 move up and down in opposite directions to each other.

The brake 41a and the brake 41b pass through the hoisting sheave 5 and the main ropes 3 as necessary.

The car emergency stop component 11 directly applies a braking force to the car 1 as needed. For example, the car emergency stop member 11 is effective when the main rope 3 is slack or broken. The car safety device 11 is configured to generate a braking force only when the car 1 descends.

The counterweight emergency stop member 21 directly applies a braking force to the counterweight 2. For example, the counterweight emergency stop member 21 is effective when the main rope 3 is slack or broken. The counterweight emergency stop member 21 is configured to generate a braking force only when the counterweight 2 is lowered.

The car buffer 12 reduces the impact of the car 1 when it should collide with the bottom of the hoistway. The car buffer switch 13 detects that the car buffer 12 starts operating due to collision of the car 1. The car buffer switch 13 is turned on when the plunger of the car buffer 12 is at an initial position before being pushed into the car 1. The car buffer switch 13 is switched from on to off when the car buffer 12 operates and the plunger of the car buffer 12 starts to descend.

The counterweight buffer 22 reduces the impact of the counterweight 2 when it collides with the bottom of the hoistway. The counterweight buffer switch 23 detects that the counterweight buffer 22 starts operating due to the collision of the counterweight 2. The counterweight buffer switch 23 is in an on state when the plunger of the counterweight buffer 22 is at an initial position before being pushed in by the counterweight 2. The counterweight buffer switch 23 is switched from on to off when the counterweight buffer 22 operates and the plunger of the counterweight buffer 22 starts to descend.

The car position and speed sensor 14 transmits a signal for detecting the position, the traveling speed, and the traveling direction of the car 1. The car position/speed sensor 14 is implemented by a linear encoder, a rotary encoder, and the like, which detects the amount of rotation of a sheave driven by an endless rope partially fixed to the car 1.

The safety monitoring device 100 monitors an abnormality occurring in the elevator apparatus. For example, the safety monitoring device 100 detects the position, the traveling speed, and the traveling direction of the car 1 by performing electronic arithmetic processing on a signal from the car position/speed sensor 14. When an abnormality is detected, the safety monitoring device 100 outputs an operation command to any one of the brake 41a, the brake 41b, the car emergency stop unit 11, and the counterweight emergency stop unit 21.

For example, even if the car 1 passes through the lowermost floor, the car is braked by the brake 41a and the brake 41b or by the car safety device 11. Then, the car 1 collides with the car buffer 12. As a result, the car 1 is slowly stopped by the buffering effect of the car buffer 12.

While the car 1 is slowly stopped, an impulsive deceleration that exceeds the gravitational acceleration can be instantaneously generated. However, the deceleration of the counterweight 2 does not exceed the gravitational acceleration. Therefore, the tension of the main rope 3 connecting the car 1 and the counterweight 2 is reduced or lost, and the counterweight 2 jumps (jump).

In this case, the safety monitoring device 100 operates the counterweight emergency stopping member 21 when detecting that the car 1 collides with the car buffer 12. During the counterweight 2 is rising, the counterweight emergency stop component 21 does not generate a braking force. When the counterweight 2 turns to descend, the counterweight emergency stop component 21 generates a braking force. Therefore, the counterweight emergency stopping member 21 holds the counterweight 2 until the tension of the main ropes 3 is restored. As a result, the backswing of the counterweight 2 is suppressed. In this case, strong impact tension does not act on the main ropes 3.

For example, even if the car 1 passes through the uppermost floor, the car is braked by the brake 41a and the brake 41 b. Then, the counterweight 2 collides with the counterweight buffer 22. As a result, the counterweight 2 is slowly stopped by the buffering effect of the counterweight buffer 22.

In the process of slowly stopping the counterweight 2, an impulsively high deceleration exceeding the gravitational acceleration can be instantaneously generated. However, the deceleration of the car 1 does not exceed the gravitational acceleration. Therefore, the tension of the main ropes 3 connecting the car 1 and the counterweight 2 is reduced or lost, and the car 1 jumps.

In this case, the safety monitoring device 100 operates the car safety stopping member 11 when detecting that the counterweight 2 collides with the counterweight buffer 22. The car emergency stop component 11 does not generate a braking force while the car 1 is ascending. When the car 1 turns to descend, the car emergency stop component 11 generates a braking force. Therefore, the car safety stopping member 11 holds the car 1 until the tension of the main ropes 3 is restored. As a result, the swinging back of the car 1 is suppressed. In this case, strong impact tension does not act on the main ropes 3.

Next, an example 1 of abnormality monitoring performed by the safety monitoring device 100 will be described with reference to fig. 2.

Fig. 2 is a diagram for explaining 1 st example of abnormality monitoring by the safety monitoring device for an elevator apparatus according to embodiment 1.

In fig. 2, a curve 1000 represents the relationship between the speed of the car 1 traveling toward the lowermost floor and the distance from the position where the car 1 collides with the car buffer 12. Curve 1001 is a first safety monitoring reference in safety monitoring device 100. Curve 1002 is a second safety monitoring reference in the safety monitoring device 100. The second safety monitoring reference is set higher than the first safety monitoring reference.

The safety monitoring device 100 detects the position of the car 1 and the speed of the car 1 using a car position/speed sensor signal 114 that is a signal from the car position/speed sensor 14. The security monitoring apparatus 100 compares these detection results with the first security monitoring criterion and the second security monitoring criterion.

When the speed of the car 1 exceeds the first safety monitoring reference, the safety monitoring device 100 outputs a brake operation command 141 to operate the

brakes

41a and 41 b. When the speed of the car 1 exceeds the second safety monitoring reference, the safety monitoring device 100 outputs a car emergency stop operation command 111 to operate the car emergency stop means 11.

Here, the first safety monitoring criterion and the second safety monitoring criterion are set higher than the curve 1000 and lower as approaching the position of collision with the car buffer 12. Therefore, even if the value of the speed of the car 1 exceeds the value of the curve 1000 and the car approaches the lowermost floor at a high speed, the effect of reducing the speed at which the car 1 collides with the car buffer 12 can be expected.

Next, an example 2 of abnormality monitoring performed by the safety monitoring device 100 will be described with reference to fig. 3.

In fig. 3, a curve 2000 represents the relationship between the speed of the car 1 traveling toward the uppermost floor and the distance of the car 1 until the counterweight 2 collides with the counterweight buffer 22. Curve 2001 is a first safety monitoring reference in the safety monitoring apparatus 100. Line 2002 is a third safety monitoring reference in safety monitoring device 100. The third safety monitoring reference is set higher than the first safety monitoring reference.

The safety monitoring device 100 detects the position of the car 1 and the speed of the car 1 using an input signal from the car position/speed sensor 14. The security monitoring apparatus 100 compares these detection results with the first security monitoring criterion and the third security monitoring criterion.

When the speed of the car 1 exceeds the first safety monitoring reference, the safety monitoring device 100 outputs a brake operation command 141 to operate the brake 41a and the brake 41 b. When the speed of the car 1 exceeds the third safety monitoring reference, the safety monitoring device 100 outputs a counterweight emergency stop operation command 121 to operate the counterweight emergency stop means 21.

Here, the first safety monitoring criterion and the third safety monitoring criterion are set higher than the curve 2000 and lower as the position approaches the uppermost layer. Therefore, even if the value of the speed of the car 1 exceeds the value of the curve 2000 and the car approaches the uppermost floor at a high speed, the effect of suppressing the height at which the car 1 jumps up through the uppermost floor can be expected.

Next, example 3 of the abnormality monitoring performed by the safety monitoring device 100 will be described with reference to fig. 4.

Fig. 4 is a flowchart for explaining example 3 of abnormality monitoring performed by the safety monitoring device of the elevator apparatus according to embodiment 1.

The security monitoring device 100 continues processing from the start until the end is reached at the time of startup.

Specifically, in step J100, the safety monitoring device 100 determines whether the car 1 is in the process of stopping.

If it is determined in step J100 that the car 1 is in the process of stopping, the safety monitoring device 100 performs the process of step J110. In step J110, the safety monitoring device 100 determines whether the car buffer switch 13 is off.

If it is determined in step J110 that the car buffer switch 13 is off, the safety monitoring device 100 determines that the buffer stroke of the car buffer 12 is not sufficiently maintained. In this case, the security monitoring device 100 performs the process of step P110. In step P110, the safety monitoring device 100 outputs a car safety stop operation command 111 for operating the car safety stop means 11.

If it is determined in step J110 that the car buffer switch 13 is not off, or after step P110, the safety monitoring device 100 performs the process of step J120. In step J120, the safety monitoring device 100 determines whether or not the counterweight buffer switch 23 is off.

When it is determined in step J120 that the counterweight buffer switch 23 is off, the safety monitoring device 100 determines that the buffer stroke of the counterweight buffer switch 23 is not sufficiently maintained. In this case, the security monitoring device 100 performs the process of step P120. In step P120, the safety monitoring device 100 outputs a counterweight emergency stop operation command 121 for operating the counterweight emergency stop member 21.

If it is determined in step J100 that the car 1 is not in the process of stopping, the safety monitoring device 100 performs the process of step J121. In step J121, the safety monitoring device 100 determines whether or not the car buffer switch 13 is switched from on to off.

When it is determined in step J121 that the car buffer switch 13 has been switched from on to off, the safety monitoring device 100 determines that the car 1 collides with the car buffer 12. In this case, the security monitoring device 100 performs the process of step P121. In step P121, the safety monitoring device 100 outputs a counterweight emergency stop operation command 121 for operating the counterweight emergency stop member 21.

If it is determined in step J121 that the car buffer switch 13 has not been switched from on to off, or after step P121, the safety monitoring device 100 performs the process of step J111. In step J111, the safety monitoring device 100 determines whether or not switching from on to off of the counterweight buffer switch 23 is detected.

When it is determined at step J111 that the counterweight buffer switch 23 has been switched from on to off, the safety monitoring device 100 determines that the counterweight 2 has collided with the counterweight buffer 22. In this case, the safety monitoring device 100 performs the process of step P111. In step P111, the safety monitoring device 100 outputs a car safety stop operation command 111 for operating the car safety stop means 11.

If it is determined in step J120 that the counterweight buffer switch 23 is not off, or if it is not detected in step J111 after step P120 that the counterweight buffer switch 23 has been switched from on to off, or after step P111, the safety monitoring device 100 performs the process of step J130.

In step J130, the safety monitoring device 100 determines whether or not the counterweight emergency stop operation command 121 or the car emergency stop operation command 111 is output. If it is determined in step J130 that neither of the counterweight emergency stop operation command 121 and the car emergency stop operation command 111 has been output, the safety monitoring device 100 performs the process of step J100. If it is determined in step J130 that the counterweight emergency stop operation command 121 or the car emergency stop operation command 111 has been output, the safety monitoring device 100 ends the process while maintaining the corresponding output.

According to embodiment 1 described above, when an abnormality that causes a decrease in the tension of the main ropes 3 is detected, the safety monitoring device 100 operates the car safety device 11 or the counterweight safety device 21 to suppress the sway of the car 1 or the counterweight 2. Therefore, the generation of a strong impact tension on the main ropes 3 can be suppressed. As a result, the strength design criteria of the car 1, the counterweight 2, and the hoisting machine 4 directly connected to the main ropes 3 can be relaxed. By relaxing the strength design criteria, simplification, miniaturization, cost reduction, and the like of these devices can be achieved.

For example, when the safety monitoring device 100 detects that the car 1 collides with the car buffer 12, the counterweight emergency stop member 21 is operated. Therefore, the swinging back of the counterweight 2 when a high acceleration in the upward direction of the car 1 occurs can be suppressed. As a result, the counterweight 2 and the hoisting machine 4 can be simplified by relaxing the strength design criteria.

For example, when detecting that the counterweight 2 collides with the counterweight buffer 22, the safety monitoring device 100 operates the car safety stopping member 11. Therefore, the sway of the car 1 in the case where a high acceleration in the upward direction of the counterweight 2 occurs can be suppressed. As a result, the car 1 and the hoisting machine 4 can be simplified by relaxing the strength design criteria.

The safety monitoring device 100 operates the counterweight emergency stopping member 21 when the compression operation of the car buffer 12 is detected while the car 1 is traveling, and operates the car emergency stopping member 11 when the compression operation of the car buffer 12 is detected while the car 1 is stopped. Therefore, not only the swinging back of the counterweight 2 in the case where a high acceleration in the upward direction of the car 1 occurs can be suppressed, but also the collision between the car 1 and the car buffer 12 in the state where the capacity of the car buffer 12 is insufficient can be avoided. As a result, the simplification of the car 1 and the counterweight 2 can be achieved by relaxing the strength design criteria.

The safety monitoring device 100 operates the car safety stopping means 11 when the compression operation of the counterweight buffer 22 is detected while the car 1 is traveling, and operates the counterweight safety stopping means 21 when the compression operation of the counterweight buffer 22 is detected while the car 1 is stopped. Therefore, not only the sway back of the car 1 in the case where a high acceleration in the upward direction of the counterweight 2 occurs can be suppressed, but also a case where the counterweight 2 collides with the counterweight buffer 22 in a state where the capacity of the counterweight buffer 22 is insufficient can be avoided. As a result, the car 1 and the counterweight 2 can be simplified by relaxing the strength design criteria.

In fig. 4, the criterion in the process of step J121 may be changed to "has the car passed through the uppermost floor? ". In this case, the counterweight emergency stopping member 21 can be operated earlier. As a result, the tension that gives a strong impact to the main ropes 3 can be more reliably suppressed.

In fig. 4, the criterion in the process of step J111 may be changed to "whether or not the car passes through the lowermost floor? ". In this case, the car safety device 11 can be operated earlier. As a result, the tension that gives a strong impact to the main ropes 3 can be more reliably suppressed.

Next, an example of the security monitoring device 100 will be described with reference to fig. 5.

The functions of the security monitoring device 100 may be implemented by a processing circuit. For example, the processing circuit is provided with at least one processor 300a and at least one memory 300b. For example, the processing circuit is provided with at least one dedicated hardware 400.

In the case where the processing circuit includes at least one processor 300a and at least one memory 300b, the functions of the security monitoring apparatus 100 are implemented by software, firmware, or a combination of software and firmware. At least one of the software and the firmware is described as a program. At least one of the software and firmware is stored in the at least one memory 300b. The at least one processor 300a realizes each function of the security monitoring apparatus 100 by reading out and executing the program stored in the at least one memory 300b. The at least one processor 300a is also referred to as a central processing unit, computing unit, microprocessor, microcomputer, DSP. For example, the at least one Memory 300b may be a nonvolatile or volatile semiconductor Memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash Memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), a magnetic Disk, a flexible Disk, an optical Disk, a CD (compact Disk), a mini Disk (mini Disk), a DVD (Digital Versatile Disk), or the like.

In the case of a processing Circuit provided with at least one dedicated hardware 400, the processing Circuit is implemented by, for example, a single Circuit, a composite Circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. For example, each function of the security monitoring apparatus 100 is realized by a processing circuit. For example, the functions of the security monitoring apparatus 100 are collectively realized by a processing circuit.

The functions of the security monitoring apparatus 100 may be partially implemented by dedicated hardware 400 and partially implemented by software or firmware. For example, the function of detecting the speed of the car 1 may be realized by a processing circuit as dedicated hardware 400, and the function other than the function of detecting the speed of the car 1 may be realized by at least one processor 300a reading out and executing a program stored in at least one memory 300b.

In this manner, the processing circuit implements the functions of the security monitoring device 100 by hardware 400, software, firmware, or a combination thereof.

Embodiment 2.

Fig. 6 is a configuration diagram of an elevator apparatus according to embodiment 2. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals. The description of this portion is omitted.

The elevator apparatus according to embodiment 2 is an elevator apparatus according to embodiment 1 to which a car acceleration sensor 15 is added. The car acceleration sensor 15 is provided on the upper part of the car 1. The car acceleration sensor 15 detects the acceleration of the car 1.

The safety monitoring device 100 receives an input of a car acceleration sensor signal 115 corresponding to the acceleration of the car 1 detected by the car acceleration sensor 15.

When the buffer stroke of the counterweight buffer 22 is insufficient, the safety monitoring device 100 operates the counterweight emergency stop member 21 to suppress the counterweight 2 from colliding with the counterweight buffer 22 at a high speed.

When a high acceleration such as a gravitational acceleration in the upward direction acts while the car 1 is descending, the tension of the main ropes 3 decreases. In this case, the counterweight 2 jumps up. At this time, the counterweight emergency stop member 21 is operated. As a result, the backswing of the counterweight 2 is suppressed.

When the buffer stroke of the car buffer 12 is insufficient, the safety monitoring device 100 operates the car safety stopping member 11 to prevent the car 1 from colliding with the car buffer 12 at a high speed.

When a high acceleration such as a gravitational acceleration in the downward direction is applied while the car 1 is ascending, the tension of the main ropes 3 is reduced. In this case, the car 1 jumps. At this time, the car safety device 11 operates. As a result, the swing back of the car 1 is suppressed.

Next, an example of abnormality monitoring performed by the safety monitoring device 100 will be described with reference to fig. 7.

Fig. 7 is a flowchart for explaining an example of abnormality monitoring performed by the safety monitoring device for an elevator apparatus according to embodiment 2.

Specifically, in step J200, the safety monitoring device 100 determines whether the car 1 is in the process of stopping.

When it is determined in step J200 that the car 1 is in the process of stopping, the safety monitoring device 100 performs the process of step J210. In step J210, the safety monitoring device 100 determines whether or not the car buffer switch 13 is off.

If it is determined in step J210 that the car buffer switch 13 is off, the safety monitoring device 100 determines that the buffer stroke of the car buffer 12 is not sufficiently maintained. In this case, the security monitoring device 100 performs the process of step P210. In step P210, the safety monitoring device 100 outputs a car safety stop operation command 111 for operating the car safety stop means 11.

If it is determined in step J210 that the car buffer switch 13 is not off, or after step P210, the safety monitoring device 100 performs the process of step J220. In step J220, the safety monitoring device 100 determines whether or not the counterweight buffer switch 23 is off.

When it is determined in step J220 that the counterweight buffer switch 23 is off, the safety monitoring device 100 determines that the buffer stroke of the counterweight buffer switch 23 is not sufficiently maintained. In this case, the security monitoring device 100 performs the process of step P220. In step P220, the safety monitoring device 100 outputs a counterweight emergency stop operation command 121 for operating the counterweight emergency stop member 21.

If it is determined in step J200 that the car 1 is not in the process of stopping, the safety monitoring device 100 performs the process of step J211. In step J211, the safety monitoring device 100 determines whether the car 1 is ascending using the car position/velocity sensor signal 114 output from the car position/velocity sensor 14.

If it is determined in step J211 that the car 1 is ascending, the safety monitoring device 100 performs the process of step J212. In step J212, the safety monitoring device 100 determines whether the acceleration in the downward direction of the car 1 is smaller than a preset value using the car acceleration sensor signal 115.

If it is determined in step J212 that the acceleration of the car 1 in the downward direction is not less than the preset value, the safety monitoring device 100 performs the process of step P211. In step P211, the safety monitoring device 100 outputs a car emergency stop operation command 111 for operating the car emergency stop component 11.

If it is determined at step J211 that the car 1 is not ascending, or if it is determined at step J212 that the acceleration of the car 1 in the downward direction is smaller than a predetermined value, or after step P211, the safety monitoring device 100 performs the process of step J221.

In step J221, the safety monitoring device 100 determines whether the car 1 is descending using the car position/speed sensor signal 114 output from the car position/speed sensor 14.

If it is determined at step J221 that the car 1 is descending, the safety monitoring device 100 performs the process of step J222. In step J222, the safety monitoring device 100 determines whether or not the acceleration of the car 1 in the upward direction is smaller than a preset value using the car acceleration sensor signal 115.

When it is determined in step J222 that the acceleration of the car 1 in the upward direction is not less than the preset value, the safety monitoring device 100 performs the process of step P212. In step P212, the safety monitoring device 100 outputs the counterweight emergency stop operation command 121 for operating the counterweight emergency stop means 21.

If the counterweight buffer switch 23 is not turned off in step J220, if it is determined that the car 1 is not descending in step J221 after step P220, if the acceleration of the car 1 in the upward direction is smaller than a predetermined value in step J222, or after step P212, the safety monitoring device 100 performs the process of step J230.

In step J230, the safety monitoring device 100 determines whether or not the counterweight emergency stop operation command 121 or the car emergency stop operation command 111 is output. If it is determined in step J230 that neither of the counterweight emergency stop operation command 121 and the car emergency stop operation command 111 has been output, the safety monitoring device 100 performs the process of step J200. When the counterweight emergency stop operation command 121 or the car emergency stop operation command 111 is output in step J230, the safety monitoring device 100 ends the process while maintaining the corresponding output.

The preset value is set to a value higher than the acceleration generated by driving or braking of the hoisting machine 4. The preset value is set to a value higher than acceleration due to acceleration and deceleration of the car 1 when a user or a baggage rides in and out of the car 1, power failure or stop, and acceleration due to bouncing of a user inside the car 1 or shaking of a building. For example, the preset value is set to a value of substantially the gravitational acceleration in consideration of some error.

According to embodiment 2 described above, the safety monitoring device 100 operates the counterweight emergency stopping member 21 when the acceleration of the car 1 becomes an acceleration in the upward direction that is higher than the acceleration generated by the driving force or the braking force of the hoisting machine 4. Therefore, a decrease in the tension of the main ropes 3 can be easily detected. By relaxing the strength design criteria, simplification of the counterweight 2 can be achieved.

Further, the safety monitoring device 100 operates the car safety stopping member 11 when the acceleration of the car 1 becomes higher than the acceleration in the downward direction generated by the driving force or the braking force of the hoisting machine 4. Therefore, a decrease in the tension of the main ropes 3 can be easily detected. By relaxing the strength design criteria, the car 1 can be simplified.

In this case, the acceleration of the car 1 is obtained from a car acceleration sensor 15. Thus, sensors can be integrated on the car 1. As a result, the cable wiring work is reduced, and the sensors can be easily attached.

Here, as a phenomenon in which acceleration such as gravitational acceleration in the upward direction acts on the car 1 during descent, a case is assumed in which the car 1 collides with the car buffer 12. A case is assumed where the counterweight 2 collides with the counterweight buffer 22 as a phenomenon in which acceleration such as acceleration of gravity in the downward direction acts on the car 1 during the ascent. Therefore, in embodiment 2, not only the same effects as those in embodiment 1 can be obtained, but also the same effects can be obtained with respect to the occurrence of a phenomenon other than a collision with each of the dampers.

Embodiment 3.

Fig. 8 is a configuration diagram of an elevator apparatus according to embodiment 3. The same or corresponding portions as those in embodiment 1 or embodiment 2 are denoted by the same reference numerals. The description of this portion is omitted.

In embodiment 3, the counterweight emergency stop member 21 is not connected to the safety monitoring device 100.

The mass body 211 for emergency stop driving, the elastic body 212 for emergency stop driving, and the coupling mechanism 213 for emergency stop driving are provided on the upper portion of the counterweight 2. The mass body 211 for emergency stop driving, the elastic body 212 for emergency stop driving, and the coupling mechanism 213 for emergency stop driving are provided so as to be able to mechanically drive the counterweight emergency stop member 21. For example, the mass body 211 for emergency stop driving, the elastic body 212 for emergency stop driving, and the coupling mechanism 213 for emergency stop driving operate according to the principle shown in international publication No. 2016/162946.

Specifically, the braking member of the counterweight emergency stopping member 21 is linked to the mass body 211 for emergency stop driving by the coupling mechanism 213 for emergency stop driving in an interlocking manner. The mass body 211 for emergency stop driving is provided to the counterweight 2 via the elastic body 212 for emergency stop driving. When the value of the downward acceleration of the counterweight 2 exceeds a predetermined value, the braking member of the counterweight emergency stop member 21 is displaced and operated by the coupling mechanism 213 for emergency stop driving by the upward inertial force generated in the mass body 211 for emergency stop driving and the elastic restoring force of the elastic body 212 for emergency stop driving.

If the car 1 should pass through the lowermost floor, the car 1 collides with the car buffer 12. At this time, the car 1 is slowly stopped by the buffering effect of the car buffer 12.

While the car 1 is slowly stopped, an impulsive deceleration that exceeds the gravitational acceleration can be instantaneously generated. At this time, the deceleration of the counterweight 2 does not exceed the gravitational acceleration. Therefore, the tension of the main ropes 3 connecting the car 1 and the counterweight 2 is reduced or lost, and the counterweight 2 jumps. In this case, a gravitational acceleration in the downward direction occurs in the counterweight 2. As a result, the counterweight emergency stop member 21 operates.

During the counterweight 2 is rising, the counterweight emergency stop component 21 does not generate a braking force. When the counterweight 2 turns to descend, the counterweight emergency stop component 21 generates a braking force. As a result, the counterweight emergency stopping member 21 holds the counterweight 2 until the tension of the main ropes 3 is restored. As a result, the backswing of the counterweight 2 is suppressed. In this case, strong impact tension does not act on the main ropes 3.

In the event that the car 1 passes through the uppermost floor, the car 1 is braked by the brake 41a and the brake 41 b. Then, the counterweight 2 collides with the counterweight buffer 22. As a result, the counterweight 2 is slowly stopped by the buffering effect of the counterweight buffer 22.

At this time, the safety monitoring device 100 operates the car safety device 11 when detecting that the counterweight 2 collides with the counterweight buffer 22.

The car emergency stop component 11 does not generate a braking force while the car 1 is ascending. When the car 1 turns to descend, the car emergency stop component 11 generates a braking force. The car emergency stop member 11 holds the car 1 until the tension of the main ropes 3 is restored. As a result, the swinging back of the car 1 is suppressed. In this case, strong impact tension does not act on the main ropes 3.

Next, an example of abnormality monitoring performed by the safety monitoring device 100 will be described with reference to fig. 9.

Fig. 9 is a flowchart for explaining an example of abnormality monitoring performed by the safety monitoring device of the elevator apparatus according to embodiment 3.

In step J300, the safety monitoring device 100 determines whether the car 1 is in the process of stopping.

If it is determined in step J300 that the car 1 is in the process of stopping, the safety monitoring device 100 performs the process of step J310. In step J310, the safety monitoring device 100 determines whether or not the car buffer switch 13 is off.

If it is determined in step J310 that the car buffer switch 13 is off, the safety monitoring device 100 determines that the buffer stroke of the car buffer 12 is not sufficiently maintained. In this case, the security monitoring device 100 performs the process of step P310. In step P310, the safety monitoring device 100 outputs a car emergency stop operation command 111 for operating the car emergency stop component 11.

If it is determined in step J300 that the car 1 is not in the process of stopping, the safety monitoring device 100 performs the process of step J311. In step J311, the safety monitoring device 100 determines whether or not switching from on to off of the counterweight buffer switch 23 is detected.

When it is determined at step J311 that the counterweight buffer switch 23 has been switched from on to off, the safety monitoring device 100 determines that the counterweight 2 has collided with the counterweight buffer 22. In this case, the security monitoring device 100 performs the process of step P311. In step P311, the safety monitoring device 100 outputs a car emergency stop operation command 111 for operating the car emergency stop component 11.

If it is determined in step J310 that the counterweight buffer switch 13 is not off, or after step P120, or if it is not detected in step J311 that the counterweight buffer switch 23 has been switched from on to off, or after step J311, the safety monitoring device 100 performs the process of step J320.

In step J320, the safety monitoring device 100 determines whether or not the car emergency stop operation command 111 is output. If it is determined in step J320 that the car emergency stop operation command 111 has not been output, the safety monitoring device 100 performs the process of step J300. If it is determined in step J320 that the car emergency stop operation command 111 has been output, the safety monitoring device 100 ends the process while maintaining the output of the car emergency stop operation command 111.

According to embodiment 3 described above, the safety monitoring device 100 operates the car safety stopping member 11 when detecting that the counterweight 2 collides with the counterweight buffer 22 while the car 1 is traveling, and operates the car safety stopping member 11 when detecting the compression operation of the car buffer 12 during the stop of the car 1. Therefore, wiring of the counterweight 2 may not be required.

Industrial applicability

As described above, the elevator apparatus of the present invention can be used in an elevator system.

Description of the reference symbols

1: a car; 2: counterweight; 3: a main rope; 4: a traction machine; 5: a traction sheave; 6: a deflector wheel; 11: a car emergency stop component; 12: a car buffer; 13: a car bumper switch; 14: a car position and speed sensor; 21: a counterweight emergency stop component; 22: a counterweight buffer; 23: a counterweight buffer switch; 41a: a brake; 41b: a brake; 100: a security monitoring device; 111: an emergency stop action command of the car; 113: a car buffer switch actuation signal; 114: car position speed sensor signals; 121: a counterweight emergency stop action instruction; 123: a counterweight buffer switch actuation signal; 141: a braking action command; 211: a mass body for emergency stop driving; 212: an elastic body for emergency stop driving; 213: a connection mechanism for emergency stop driving; 300a: a processor; 300b: a memory; 400: hardware.

Claims

1. An elevator device, wherein the elevator device comprises:

a car provided to be capable of ascending and descending inside a hoistway of an elevator;

a counterweight that is provided so as to be able to ascend and descend inside the hoistway;

a main rope that connects the car and the counterweight together;

a hoisting machine that applies a driving force or a braking force to the main ropes;

a car emergency stop member effective to lower the car;

a counterweight emergency stop member effective to lower the counterweight; and

and a safety monitoring device that, when detecting an abnormality that causes a decrease in the main rope tension, operates the car safety device or the counterweight safety device to suppress the swing back of the car or the counterweight.

2. The elevator arrangement according to claim 1,

the safety monitoring device operates the counterweight emergency stop means when the acceleration of the car becomes an acceleration in the upward direction that is higher than the acceleration generated by the driving force or the braking force of the hoisting machine.

3. The elevator arrangement according to claim 1,

the safety monitoring device operates the car safety stopping member when the acceleration of the car becomes higher than the acceleration in the downward direction generated by the driving force or the braking force of the hoisting machine.

4. The elevator arrangement according to claim 1,

the safety monitoring device operates the counterweight emergency stopping member when the acceleration of the car becomes an acceleration in the upward direction that is higher than the acceleration generated by the driving force or the braking force of the hoisting machine, and operates the car emergency stopping member when the acceleration of the car becomes an acceleration in the downward direction that is higher than the acceleration generated by the driving force or the braking force of the hoisting machine.

5. The elevator arrangement according to claim 2,

the elevator device is provided with a car buffer corresponding to the car,

the safety monitoring device operates the counterweight emergency stop member when detecting that the car collides with the car buffer.

6. The elevator arrangement according to claim 3,

the elevator device is provided with a counterweight buffer corresponding to the counterweight,

the safety monitoring device operates the car emergency stop member when detecting that the counterweight collides with the counterweight buffer.

7. The elevator device according to claim 4, wherein the elevator device comprises:

a car buffer corresponding to the car; and

a counterweight buffer corresponding to the counterweight,

the safety monitoring device operates the counterweight emergency stop member when detecting that the car collides with the car buffer, and operates the car emergency stop member when detecting that the counterweight collides with the counterweight buffer.

8. The elevator arrangement according to claim 5,

the safety monitoring device activates the counterweight emergency stop member when detecting a compression operation of the car buffer while the car is traveling, and activates the car emergency stop member when detecting a compression operation of the car buffer while the car is stopped.

9. The elevator arrangement according to claim 6,

the safety monitoring device activates the car safety stop member when detecting a compression operation of the counterweight buffer while the car is traveling, and activates the counterweight safety stop member when detecting a compression operation of the counterweight buffer while the car is stopped.

10. The elevator arrangement according to claim 4,

the safety monitoring device operates the counterweight emergency stop member when the acceleration of the car becomes an acceleration in the upward direction that is higher than the acceleration generated by the driving force or the braking force of the hoisting machine while the car is descending, and operates the car emergency stop member when the acceleration of the car becomes an acceleration in the downward direction that is higher than the acceleration generated by the driving force or the braking force of the hoisting machine while the car is ascending.

11. The elevator device according to claim 1, wherein the elevator device comprises:

a car buffer corresponding to the car; and

a counterweight buffer corresponding to the counterweight,

the safety monitoring device operates the car safety stopping member when detecting that the counterweight collides with the counterweight buffer while the car is traveling, and operates the car safety stopping member when detecting a compression operation of the car buffer during a stop of the car.