A method for automatically detecting and judging the cause of insufficient elevator traction force

Abstract

The present invention discloses an automatic detection and judgment method for the cause of insufficient elevator traction force. The elevator control system first detects whether the wire rope and the traction machine are slipping. If no slipping occurs, it indicates that the elevator traction force is normal; if slipping occurs, it indicates that the elevator traction force is insufficient, and the elevator control system continues to determine whether the elevator is a newly installed elevator; if the elevator control system determines that the elevator is a newly installed elevator, the causes of the elevator wire rope slipping include insufficient balance coefficient and insufficient wrap angle; if the elevator control system determines that the elevator is not a newly installed elevator, the causes of the elevator wire rope slipping include greasy wire rope, worn wire rope and worn traction wheel rope groove. The specific cause of the slipping can be automatically analyzed and diagnosed, whether it is caused by greasy wire rope, worn traction wheel rope groove, worn wire rope, insufficient wrap angle or insufficient balance coefficient, and timely notify maintenance personnel to handle it.

Description

Technical Field

[0001] The invention belongs to the technical field of elevators and relates to an automatic detection and judgment method for the cause of insufficient elevator traction force. Background Art

[0002] The concrete manifestation of insufficient traction force of an elevator is the slippage of the wire rope and the traction machine. For elevators currently on the market that are conventionally suspended by wire ropes, the main reasons for the slippage of the wire rope and the traction machine are greasy wire rope, wear of the traction wheel rope groove, wear of the wire rope, insufficient wrap angle, and insufficient balance coefficient. However, the elevator industry has not yet systematically conducted effective monitoring and analysis of insufficient traction force, lacks real-time monitoring of traction wire ropes, and only measures the wire rope diameter and the traction machine rope groove diameter by eye or with a vernier caliper to judge the wear of the wire rope and the traction machine rope groove during maintenance. These passive methods of discovery by humans cannot achieve the purpose of on-demand and precise maintenance of elevators. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an automatic detection and judgment method for the cause of insufficient elevator traction force. When the wire rope slips during elevator operation, it can automatically analyze and diagnose the specific cause of the slip, whether it is caused by grease in the wire rope, wear of the traction wheel rope groove, wear of the wire rope, insufficient wrap angle or insufficient balance coefficient, and promptly notify maintenance personnel to handle it.

[0004] The technical scheme for achieving the above-mentioned purpose is: an automatic detection and judgment method for the cause of insufficient elevator traction force, wherein an elevator control system, an ultra-high-definition camera and a traction machine are installed in the elevator room, the traction machine pulls the car to move in the hoistway through a wire rope, an encoder is installed on the traction machine, the encoder has the same rotation speed as the traction machine, the encoder feeds back the number of pulses to the elevator control system every time it rotates one circle, and the elevator control system calculates the speed and displacement distance of the traction machine through the number of pulses fed back by the encoder; the ultra-high-definition camera is used to capture and judge the working condition of the traction wheel wire rope; the ultra-high-definition camera, the traction machine and the encoder are respectively connected to the elevator control system; the automatic detection and judgment method for the cause of insufficient elevator traction force comprises the following steps:

[0005] S1, the elevator control system first detects whether the wire rope and the traction machine are slipping. If there is no slipping, it means that the elevator traction force is normal; if there is slipping, it means that the elevator traction force is insufficient, and the elevator control system continues to determine whether this elevator is a newly installed elevator;

[0006] S2, if the elevator control system determines that the elevator is a newly installed elevator, the reasons for the slippage of the elevator wire rope are insufficient balance coefficient and insufficient wrap angle. The elevator control system continues to determine whether the elevator balance coefficient is sufficient. If it is sufficient, the slippage is caused by insufficient wrap angle; if the elevator control system determines that the elevator balance coefficient is insufficient, the slippage is caused by insufficient balance coefficient;

[0007] S3, if the elevator control system determines that the elevator is not a newly installed elevator, the reasons for the elevator wire rope slipping are greasy wire rope, wire rope wear and traction wheel rope groove wear: use the ultra-high-definition camera to determine whether the wire rope is greasy. If the ultra-high-definition camera analyzes that the wire rope is greasy, it is determined that the slipping is caused by the greasy wire rope; if the ultra-high-definition camera analyzes that the wire rope is not greasy, the ultra-high-definition camera continues to analyze whether the diameter of the wire rope has become thinner. If the ultra-high-definition camera analyzes that the diameter of the wire rope has become thinner, it is determined that the slipping is caused by wire wear; if the ultra-high-definition camera analyzes that the wire rope diameter is normal, it is determined that the slipping is caused by the wear of the traction wheel rope groove;

[0008] The ultra-high definition camera feeds back the determination result to the elevator control system in real time.

[0009] The above-mentioned automatic detection and judgment method for the cause of insufficient elevator traction force, in step S1, when the elevator is installed and debugged, the encoder performs self-learning of the shaft data, the car runs from the ground floor to the top floor, and the elevator control system locates the leveling position of each floor through the door area switch signal, and the elevator control system then records the distance between each floor through the number of pulses fed back by the encoder, and stores the shaft data; the elevator control system presets a floor station running distance deviation protection value of X%, and when the elevator is put into use, the elevator control system compares and calculates each floor station running distance with the self-learning recorded distance, and when the deviation value is greater than X%, it is judged that the wire rope is slipping.

[0010] The above-mentioned automatic detection and judgment method for the cause of insufficient elevator traction force, wherein the elevator control system has the function of detecting and storing the number of elevator operations and the operating time. When the elevator control system detects that the number of elevator operations is less than 5000 times and the cumulative operating time is less than 175200 hours, the elevator control system determines that the elevator is a newly installed elevator. If this condition is not met, the elevator is determined to be a non-newly installed elevator.

[0011] In the above-mentioned automatic detection and judgment method for the cause of insufficient elevator traction force, in step S2, when the elevator is in an idle waiting state, the elevator control system selects the data when the car runs to the middle position of the shaft, which are the upward speed Vs, the downward power Ps, the downward speed Vx, and the downward power Px, and calculates the real-time elevator balance coefficient value according to the power / speed method balance coefficient calculation formula:

[0012] K=(PsVx+PxVs) / 2QgVxVs

[0013] In the formula, K is the balance coefficient, Q is the rated load of the elevator, and g is the acceleration of gravity;

[0014] The elevator control system then compares the real-time elevator balance coefficient value with the balance coefficient value range set in the elevator control system to determine whether the elevator balance coefficient is sufficient. If the real-time elevator balance coefficient value is not within the set balance coefficient value range, it is determined that the elevator balance coefficient is insufficient; if the real-time elevator balance coefficient value is within the set balance coefficient value range, it is determined that the elevator balance coefficient is sufficient.

[0015] In the above-mentioned automatic detection and judgment method for the cause of insufficient elevator traction force, in step S3, a standard traction wheel wire rope working condition diagram is preset in the memory of the ultra-high-definition camera; when the elevator is working, the traction machine rotates, and the elevator control system outputs a pause signal to the ultra-high-definition camera, and the ultra-high-definition camera pauses to capture the traction wheel wire rope working condition in real time; when the elevator is suspended and the traction machine stops rotating, the elevator control system outputs a start signal to the ultra-high-definition camera, and the ultra-high-definition camera starts to capture the traction wheel wire rope working condition in real time, with a capture frequency of 5 frames / second, until the traction machine starts to rotate again, and the ultra-high-definition camera stops capturing;

[0016] The ultra-high-definition camera compares the captured real-time traction sheave wire rope working condition diagram with the standard traction sheave wire rope working condition diagram preset in the ultra-high-definition camera memory, and then analyzes and judges it through the built-in intelligent algorithm of the ultra-high-definition camera. The specific process is as follows:

[0017] S31, the wire rope has no greasy accumulation in the standard traction sheave wire rope working condition diagram and presents a normal metallic color; if there is greasy accumulation on the wire rope in the real-time traction sheave wire rope working condition diagram, and there is obvious excess attached to the wire rope, and the diameter of the thinnest part of the excess is greater than 50% of the wire rope diameter, the ultra-high-definition camera determines that the wire rope is greasy and determines that the slippage is caused by the greasy wire rope;

[0018] S32, if the ultra-high-definition camera analyzes that the wire rope is not greasy, and no less than one wire rope in the real-time traction sheave wire rope operating diagram is smaller than 90% of the wire rope calibrated size, it is judged that the wire rope diameter has become thinner and the slippage is determined to be caused by wire wear;

[0019] S32, if the ultra-high-definition camera analyzes that the diameter of the wire rope is normal, it is determined that the slippage is caused by wear of the rope groove of the traction wheel.

[0020] The above-mentioned automatic detection and judgment method for the cause of insufficient elevator traction force, wherein the ultra-high-definition camera communicates with the elevator control system through a 485 communication interface; the ultra-high-definition camera is installed in the elevator room through a lifting bracket, and the ultra-high-definition camera is parallel to the edge of the traction wheel wire rope of the traction machine.

[0021] The automatic detection and judgment method for the cause of insufficient elevator traction force of the present invention can automatically analyze and diagnose the specific cause of the slip when the wire rope slips during elevator operation, whether it is caused by grease in the wire rope, wear of the traction wheel rope groove, wear of the wire rope, insufficient wrap angle or insufficient balance coefficient, and promptly notify maintenance personnel to handle it. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the method for automatically detecting and judging the cause of insufficient elevator traction force of the present invention;

[0023] Figure 2 This is a working diagram of a traction elevator;

[0024] Figure 3 This is the installation diagram of the elevator control system and ultra-high-definition camera;

[0025] Figure 4 This is the self-detection flow chart of the elevator balance coefficient. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the specific implementation methods thereof are described in detail below in conjunction with the accompanying drawings:

[0027] See also Figure 1 , Figure 2 , Figure 3 and Figure 4In the best embodiment of the present invention, an elevator control system 1, an ultra-high-definition camera 2 and a traction machine 4 are installed in an elevator room 9. The traction machine 4 pulls the car 7 through the wire rope 5 to move in the hoistway 8. A door zone switch plugboard 81 is provided on each floor, and a door zone switch 71 is provided on the car 7. An encoder 3 is installed on the traction machine 4. The encoder 3 has the same rotation speed as the traction machine 4. The encoder 3 feeds back the number of pulses to the elevator control system 1 every time it rotates one circle. The elevator control system 1 calculates the speed and displacement distance of the traction machine through the number of pulses accumulated within a certain period of time. The ultra-high-definition camera 2 is used to capture and judge the working condition of the traction wheel wire rope. The ultra-high-definition camera 2, the traction machine 4 and the encoder 3 are respectively connected to the elevator control system 1. The ultra-high-definition camera 2 communicates with the elevator control system 1 through the 485 communication interface. The ultra-high-definition camera 2 is installed in the elevator room 9 through the hoisting bracket 21, and the ultra-high-definition camera 2 is parallel to the edge of the traction wheel wire rope of the traction machine 4, so that the ultra-high-definition camera 2 can capture the working condition of the traction wheel wire rope.

[0028] A method for automatically detecting and judging the cause of insufficient elevator traction force comprises the following steps:

[0029] S1, the elevator control system 1 first detects whether the wire rope and the traction machine are slipping. If no slipping occurs, it indicates that the elevator traction force is normal; if slipping occurs, it indicates that the elevator traction force is insufficient, and the elevator control system continues to determine whether the elevator is a newly installed elevator;

[0030] S2, if the elevator control system 1 determines that the elevator is a newly installed elevator, the causes of the elevator wire rope slippage are insufficient balance coefficient and insufficient wrap angle. The elevator control system 1 continues to determine whether the elevator balance coefficient is sufficient. If it is sufficient, the slippage is caused by insufficient wrap angle; if the elevator control system 1 determines that the elevator balance coefficient is insufficient, the slippage is caused by insufficient balance coefficient;

[0031] S3, if the elevator control system 1 determines that the elevator is not a newly installed elevator, the causes of the elevator wire rope slippage include greasy wire rope, worn wire rope and worn rope groove of the traction wheel: determine whether the wire rope is greasy by the ultra-high-definition camera 2. If the ultra-high-definition camera 2 analyzes that the wire rope is greasy, it is determined that the slippage is caused by the greasy wire rope; if the ultra-high-definition camera 2 analyzes that the wire rope is not greasy, the ultra-high-definition camera 2 continues to analyze whether the diameter of the wire rope becomes thinner. If the ultra-high-definition camera 2 analyzes that the diameter of the wire rope becomes thinner, it is determined that the slippage is caused by wire wear; if the ultra-high-definition camera 2 analyzes that the diameter of the wire rope is normal, it is determined that the slippage is caused by wear of the rope groove of the traction wheel; the ultra-high-definition camera 2 will feed back the judgment result to the elevator control system 1 in real time.

[0032] In step S1, when the elevator is installed and debugged, the encoder 3 performs self-learning of the shaft data, and the car 7 runs from the ground floor to the top floor. Each floor is provided with a door area switch plug-in board 81, and the car 7 is provided with a door area switch 71. The elevator control system 1 locates the leveling position of each floor through the door area switch signal, and the elevator control system 1 records the distance between each floor through the number of pulses fed back by the encoder 3, and stores the shaft data; the elevator control system 1 presets the floor station running distance deviation protection value X%, and when the elevator is put into use, the elevator control system 1 compares and calculates each floor station running distance with the self-learning recorded distance. When the deviation value is greater than X%, it is judged that the wire rope is slipping.

[0033] The elevator control system 1 has the function of detecting and storing the number of elevator operations and the operating time. When the elevator control system 1 detects that the number of elevator operations is less than 5,000 times and the cumulative operating time is less than 175,200 hours, the elevator control system 1 determines that the elevator is a newly installed elevator. If this condition is not met, the elevator is determined to be a non-newly installed elevator.

[0034] Please see again Figure 4 In step S2, when the elevator is in an idle waiting state, the elevator control system 1 selects the data when the car runs to the middle position of the shaft, which are the upward speed Vs, the downward power Ps, the downward speed Vx, and the downward power Px, and calculates the real-time elevator balance coefficient value according to the power / speed method balance coefficient calculation formula:

[0035] K=(PsVx+PxVs) / 2QgVxVs

[0036] In the formula, K is the balance coefficient, Q is the rated load of the elevator, and g is the acceleration of gravity;

[0037] The elevator control system 1 then compares the real-time elevator balance coefficient value with the balance coefficient value range set in the elevator control system to determine whether the elevator balance coefficient is sufficient. If the real-time elevator balance coefficient value is not within the set balance coefficient value range, it is determined that the elevator balance coefficient is insufficient; if the real-time elevator balance coefficient value is within the set balance coefficient value range, it is determined that the elevator balance coefficient is sufficient.

[0038] In step S3, a standard traction wheel wire rope working condition diagram is preset in the memory of the ultra-high-definition camera 2; when the elevator is working, the traction machine 4 rotates, and the elevator control system 1 outputs a pause signal to the ultra-high-definition camera 2, and the ultra-high-definition camera 2 pauses to capture the real-time working condition of the traction wheel wire rope; when the elevator is suspended and the traction machine 4 stops rotating, the elevator control system 1 outputs a start signal to the ultra-high-definition camera 2, and the ultra-high-definition camera 2 starts to capture the working condition of the traction wheel wire rope in real time, with a capture frequency of 5 frames per second, until the traction machine 4 starts to rotate again, and the ultra-high-definition camera 2 stops capturing; after the ultra-high-definition camera 2 deduplicates and filters the captured pictures, it selects pictures that meet the following conditions as the real-time traction wheel wire rope working condition diagram: the traction wheel wire rope is in the middle of the captured picture; and the captured picture is not overexposed or too dark; and the captured picture is well focused and clear.

[0039] The ultra-high-definition camera 2 compares the captured real-time traction sheave wire rope working condition diagram with the standard traction sheave wire rope working condition diagram preset in the ultra-high-definition camera memory, and then analyzes and judges it through the built-in intelligent algorithm of the ultra-high-definition camera 2. The specific process is as follows:

[0040] S31, the wire rope has no greasy accumulation in the standard traction wheel wire rope working condition diagram and presents a normal metallic color; if greasy accumulation appears on the wire rope in the real-time traction wheel wire rope working condition diagram, and there is obvious excess attached to the wire rope, and the diameter of the thinnest part of the excess is greater than 50% of the diameter of the wire rope, then the ultra-high-definition camera 2 determines that the wire rope is greasy and determines that the slippage is caused by the greasy wire rope;

[0041] S32, if the ultra-high-definition camera 2 analyzes that the wire rope is not greasy, and at least one wire rope in the real-time traction sheave wire rope working condition diagram is smaller than 90% of the wire rope calibrated size, it is determined that the wire rope diameter is thinner and the slippage is determined to be caused by wire wear;

[0042] S32, if the ultra-high-definition camera analyzes that the diameter of the wire rope is normal, it is determined that the slippage is caused by wear of the rope groove of the traction wheel.

[0043] The automatic detection and judgment method for the cause of insufficient elevator traction force of the present invention can automatically analyze and diagnose the specific cause of the slip when the wire rope slips during elevator operation, whether it is caused by grease in the wire rope, wear of the traction wheel rope groove, wear of the wire rope, insufficient wrap angle or insufficient balance coefficient, and promptly notify maintenance personnel to handle it.

[0044] To sum up, the automatic detection and judgment method of the cause of insufficient elevator traction force of the present invention can automatically analyze and diagnose the specific cause of the slip when the wire rope slips during elevator operation, and notify maintenance personnel in real time to come for repair, thereby realizing on-demand and accurate maintenance of the elevator.

[0045] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for automatically detecting and judging the cause of insufficient elevator traction force, characterized in that: An elevator control system, an ultra-high-definition camera and a traction machine are installed in the elevator room. The traction machine pulls the car to move in the hoistway through a steel wire rope. An encoder is installed on the traction machine. The encoder has the same rotation speed as the traction machine. The encoder feeds back the number of pulses to the elevator control system every time it rotates one circle. The elevator control system calculates the speed and displacement distance of the traction machine through the number of pulses fed back by the encoder. The ultra-high-definition camera is used to capture and judge the working condition of the traction wheel steel wire rope. The ultra-high-definition camera, the traction machine and the encoder are respectively connected to the elevator control system. The automatic detection and judgment method for the cause of insufficient elevator traction force includes the following steps: S1, the elevator control system first detects whether the wire rope and the traction machine are slipping. If there is no slipping, it means that the elevator traction force is normal; if there is slipping, it means that the elevator traction force is insufficient, and the elevator control system continues to determine whether this elevator is a newly installed elevator; S2, if the elevator control system determines that the elevator is a newly installed elevator, the reasons for the slippage of the elevator wire rope are insufficient balance coefficient and insufficient wrap angle. The elevator control system continues to determine whether the elevator balance coefficient is sufficient. If it is sufficient, the slippage is caused by insufficient wrap angle; if the elevator control system determines that the elevator balance coefficient is insufficient, the slippage is caused by insufficient balance coefficient; S3, if the elevator control system determines that the elevator is not a newly installed elevator, the reasons for the elevator wire rope slipping are greasy wire rope, wire rope wear and traction wheel rope groove wear: use the ultra-high-definition camera to determine whether the wire rope is greasy. If the ultra-high-definition camera analyzes that the wire rope is greasy, it is determined that the slipping is caused by the greasy wire rope; if the ultra-high-definition camera analyzes that the wire rope is not greasy, the ultra-high-definition camera continues to analyze whether the diameter of the wire rope has become thinner. If the ultra-high-definition camera analyzes that the diameter of the wire rope has become thinner, it is determined that the slipping is caused by wire wear; if the ultra-high-definition camera analyzes that the wire rope diameter is normal, it is determined that the slipping is caused by the wear of the traction wheel rope groove; The ultra-high definition camera feeds back the determination result to the elevator control system in real time.

2. The method for automatically detecting and judging the cause of insufficient elevator traction force according to claim 1, characterized in that: In step S1, when the elevator is installed and debugged, the encoder performs self-learning of the shaft data, and the car runs from the ground floor to the top floor. The elevator control system locates the leveling position of each floor through the door zone switch signal, and the elevator control system records the distance between each floor through the number of pulses fed back by the encoder, and stores the shaft data; The elevator control system presets a floor running distance deviation protection value of X%. When the elevator is put into use, the elevator control system compares and calculates each floor running distance with the self-learning recorded distance. When the deviation value is greater than X%, it is judged that the wire rope is slipping.

3. The method for automatically detecting and judging the cause of insufficient elevator traction force according to claim 1, characterized in that: The elevator control system has the function of detecting and storing the number of elevator operations and the running time. When the elevator control system detects that the number of elevator operations is less than 5,000 times and the cumulative running time is less than 175,200 hours, the elevator control system determines that the elevator is a newly installed elevator. If this condition is not met, the elevator is determined to be a non-newly installed elevator.

4. The method for automatically detecting and judging the cause of insufficient elevator traction force according to claim 1, characterized in that: In step S2, when the elevator is in an idle waiting state, the elevator control system selects the data when the car runs to the middle position of the shaft, which are the upward speed Vs, the downward power Ps, the downward speed Vx, and the downward power Px, and calculates the real-time elevator balance coefficient value according to the power / speed method balance coefficient calculation formula: K=(PsVx+PxVs) / 2QgVxVs In the formula, K is the balance coefficient, Q is the rated load of the elevator, and g is the acceleration of gravity; The elevator control system then compares the real-time elevator balance coefficient value with the balance coefficient value range set in the elevator control system to determine whether the elevator balance coefficient is sufficient. If the real-time elevator balance coefficient value is not within the set balance coefficient value range, it is determined that the elevator balance coefficient is insufficient; if the real-time elevator balance coefficient value is within the set balance coefficient value range, it is determined that the elevator balance coefficient is sufficient.

5. The method for automatically detecting and judging the cause of insufficient elevator traction force according to claim 1, characterized in that: In step S3, a standard traction wheel wire rope working condition diagram is preset in the memory of the ultra-high-definition camera; when the elevator is working, the traction machine rotates, and the elevator control system outputs a pause signal to the ultra-high-definition camera, and the ultra-high-definition camera pauses to capture the traction wheel wire rope working condition in real time; when the elevator is suspended and the traction machine stops rotating, the elevator control system outputs a start signal to the ultra-high-definition camera, and the ultra-high-definition camera starts to capture the traction wheel wire rope working condition in real time, with a capture frequency of 5 frames per second, until the traction machine starts to rotate again, and the ultra-high-definition camera stops capturing; The ultra-high-definition camera compares the captured real-time traction sheave wire rope working condition diagram with the standard traction sheave wire rope working condition diagram preset in the ultra-high-definition camera memory, and then analyzes and judges it through the built-in intelligent algorithm of the ultra-high-definition camera. The specific process is as follows: S31, the wire rope has no greasy accumulation in the standard traction sheave wire rope working condition diagram and presents a normal metallic color; if there is greasy accumulation on the wire rope in the real-time traction sheave wire rope working condition diagram, and there is obvious excess attached to the wire rope, and the diameter of the thinnest part of the excess is greater than 50% of the wire rope diameter, the ultra-high-definition camera determines that the wire rope is greasy and determines that the slippage is caused by the greasy wire rope; S32, if the ultra-high-definition camera analyzes that the wire rope is not greasy, and no less than one wire rope in the real-time traction sheave wire rope operating diagram is smaller than 90% of the wire rope calibrated size, it is judged that the wire rope diameter has become thinner and the slippage is determined to be caused by wire wear; S32, if the ultra-high-definition camera analyzes that the diameter of the wire rope is normal, it is determined that the slippage is caused by wear of the rope groove of the traction wheel.

6. The method for automatically detecting and judging the cause of insufficient elevator traction force according to claim 1, characterized in that: The ultra-high-definition camera communicates with the elevator control system via a 485 communication interface; the ultra-high-definition camera is installed in the elevator room via a hoisting bracket, and the ultra-high-definition camera is parallel to the edge of the traction wheel wire rope of the traction machine.

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