CN112875454A - Elevator slip detection method - Google Patents
Elevator slip detection method Download PDFInfo
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- CN112875454A CN112875454A CN202110075737.XA CN202110075737A CN112875454A CN 112875454 A CN112875454 A CN 112875454A CN 202110075737 A CN202110075737 A CN 202110075737A CN 112875454 A CN112875454 A CN 112875454A
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- 238000001514 detection method Methods 0.000 title claims abstract description 86
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 30
- 238000003745 diagnosis Methods 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
- B66B7/1207—Checking means
- B66B7/1215—Checking means specially adapted for ropes or cables
Abstract
The invention relates to the technical field of elevator detection, and discloses an elevator slipping detection method, which comprises the steps of controlling a car to run to a first preset position at a preset speed; emergency braking the car; calculating theoretical position information of the car; acquiring actual position information of the car; and judging the safety condition of the elevator system according to the theoretical position information and the actual position information. Controlling the lift car of the elevator system to be tested to run at a preset speed, and emergently braking the elevator system after the lift car runs to a first preset position. The method comprises the steps of detecting actual position information of a car after emergency braking, and obtaining a steel wire rope slipping distance of an elevator according to the actual position information and theoretical position information. The method has the advantages that the slipping distance of the steel wire rope is used as a fault diagnosis condition, whether the elevator has safety problems or not is judged, so that the accuracy of detecting the slipping fault of the steel wire rope is greatly improved, the error report or the missing report of the slipping fault of the steel wire rope is avoided, and the operation safety of the elevator is improved.
Description
Technical Field
The invention relates to the technical field of elevator detection, in particular to an elevator slipping detection method.
Background
With the continuous development of the modern society, elevators become ubiquitous aids in life. At present, in the use process of an elevator traction system, the situations of abrasion of a main machine rope groove, deformation of a steel wire rope, oil leakage of the steel wire rope and the like cause the steel wire rope and the main machine to slip, so that the problem of inaccurate car position in elevator detection is caused. When the elevator is emergently braked, the elevator car can not stop in time due to overlong running distance, so that safety accidents are caused.
In the prior art, the service condition of the elevator steel wire rope is generally qualitatively detected in a manual regular detection mode. However, since the detection result is difficult to quantitatively evaluate, if the experience of the maintenance personnel is insufficient or the responsibility is not good, the elevator fault caused by the deformation or the slippage of the steel wire rope cannot be effectively avoided, and even the safety of elevator passengers can be endangered. In addition, the manual detection of the elevator steel wire rope can also increase the working time of maintenance personnel, consume a large amount of manpower, increase the maintenance cost of the elevator and cause the waste of certain resources.
Disclosure of Invention
Therefore, it is necessary to provide an elevator slippage detection method, which aims at the problems of high maintenance cost and low detection efficiency caused by a method for detecting the use condition of an elevator steel wire rope periodically by manpower in the prior art.
An elevator slippage detection method is applied to an elevator system, the elevator system comprises a car, and the elevator slippage detection method comprises the steps of controlling the car to move to a first preset position at a preset speed; emergency braking the car; calculating theoretical position information of the car; acquiring actual position information of the car; and judging the safety condition of the elevator system according to the theoretical position information and the actual position information.
The elevator slipping detection method controls the car of the elevator system to be detected to run at a preset speed, and enables the elevator system to be emergently braked after the car runs to a first preset position. The method comprises the steps of detecting actual position information of a car after emergency braking, and obtaining a steel wire rope slipping distance of an elevator according to the actual position information and theoretical position information. The method has the advantages that the slipping distance of the steel wire rope is used as a fault diagnosis condition, whether the elevator has safety problems or not is judged, so that the accuracy of detecting the slipping fault of the steel wire rope is greatly improved, the error report or the missing report of the slipping fault of the steel wire rope is avoided, and the operation safety of the elevator is improved.
In one embodiment, the elevator system further comprises a main machine and a detection device, the theoretical position information of the car is calculated, and the rotation data of the main machine is detected by the detection device; and calculating theoretical position information of the car according to the rotation data.
In one embodiment, the obtaining the actual position information of the car comprises judging whether the elevator system is provided with a car absolute position detection system; if the elevator system is provided with the car absolute position detection system, acquiring actual position information of the car stopping position through the car absolute position detection system; and if the elevator system is not provided with the car absolute position detection system, controlling the car to move to a second preset position after preset time, and acquiring actual position information of the car stop position according to the movement distance of the car from the stop position to the second preset position.
In one embodiment, before controlling the car to move to the first preset position at the preset speed, the elevator slip detection method further comprises the steps of judging whether the current time is within a preset slip detection time period; if the current time is within a preset slip detection time period, judging whether the elevator system is in an idle running state; if the elevator system is in a free running state, controlling the elevator car to run to a first preset position at a preset speed; and if the current time is not in the preset slip detection time period or the elevator system is not in the idle running state, finishing the detection.
In one embodiment, the determining the safety condition of the elevator system according to the theoretical position information and the actual position information includes substituting the theoretical position information and the actual position information into a wire rope slip distance calculation formula to obtain a wire rope slip distance; and judging the safety condition of the elevator system according to the sliding distance of the steel wire rope.
In one embodiment, the calculation formula of the wire rope slip distance is:
L＝|A-B|；
wherein L is the wire rope slip distance, a is the theoretical position information, and B is the actual position information.
In one embodiment, said determining a safety condition of the elevator system based on the wire rope slip distance comprises determining that the elevator system has failed when the wire rope slip distance is greater than a first threshold.
In one embodiment, the elevator system is controlled to stop running when it is determined that the elevator system has failed.
In one embodiment, the determining the safety condition of the elevator system according to the wire rope slip distance further includes determining that a potential safety hazard exists in the elevator system when the wire rope slip distance is greater than a second threshold.
In one embodiment, when the elevator system is judged to have potential safety hazard, early warning information is output.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the specification, and other drawings can be obtained by those skilled in the art without inventive labor.
Fig. 1 is a method flow diagram of an elevator slip detection method according to one embodiment of the present invention;
fig. 2 is a block diagram of the elevator system according to one embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for calculating theoretical position information according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for obtaining actual location information according to an embodiment of the present invention;
FIG. 5 is a flowchart of a method for determining whether to perform a skid detection according to one embodiment of the present invention;
fig. 6 is a flow chart of a method of determining the safety of the elevator system according to one embodiment of the invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
With the continuous development of the modern society, elevators become ubiquitous aids in life. At present, the elevator system can cause the inaccurate position detection of an elevator car due to the conditions of abrasion of a main machine rope groove, deformation of a steel wire rope, oil leakage of the steel wire rope and the like in the use process. Because the friction between the steel wire rope and the elevator main machine is reduced after the rope grooves of the main machine are abraded and the steel wire rope deforms, the steel wire rope and the elevator main machine can slip in the acceleration/deceleration process of the elevator, so that the elevator can not stop moving in time after the elevator stops the main machine, and safety accidents are caused. Generally, due to the action of the elevator on the weight, when the elevator decelerates downwards under a heavy load and decelerates upwards under a no-load, the unbalanced force between the elevator car and the counterweight is the largest, and the steel wire rope slips the most seriously.
In order to meet the comfort of passengers taking the elevator, the running acceleration of the elevator is relatively small (generally less than 0.5 m/s)2) And the traction force output by the elevator main machine is smaller. Therefore, the phenomenon of wire rope slip is not obvious in the normal running process of the elevator. If only detect the phenomenon of skidding in the elevator normal operating, after host computer grooving wearing and tearing, wire rope produced the deformation, hardly in time discover the problem, take place emergency braking because of other unexpected circumstances like the elevator, probably lead to the emergence of incident.
The elevator slipping detection method provided by the invention can be used for evaluating the abrasion condition of the steel wire rope and the main machine rope groove according to the slipping distance by detecting the slipping distance of the steel wire rope during emergency braking of the elevator, so that the slipping fault of the steel wire rope can be detected in time, and the safety accident of the elevator caused by the slipping of the steel wire rope can be avoided.
Fig. 1 is a method flowchart of an elevator slip detection method according to one embodiment of the present invention, which includes the following steps S100 to S500 in one embodiment.
S100: and controlling the car to run to a first preset position at a preset speed.
S200: emergency braking the car.
S300: and calculating theoretical position information of the car.
S400: and acquiring actual position information of the car.
S500: and judging the safety condition of the elevator system according to the theoretical position information and the actual position information.
The elevator slip detection method provided by the invention is applied to an elevator system, and fig. 2 is a structural block diagram of the elevator system according to one embodiment of the invention. The elevator system comprises a car 10, a main machine 20, a detection device 30, a steel wire rope 50, a counterweight system 60 and a control cabinet 70, and part of the elevator system can also be provided with a car absolute position detection system 40. In the present embodiment, the detecting device 30 is a rotary encoder. The car 10 and the counterweight system 60 are suspended at both ends of the main machine 20 by wire ropes 50, respectively. The rotary encoder 30 is mounted on the main body 20 for detecting the rotation speed of the main body 20. When the elevator system is in normal operation, the control cabinet 70 drives the main machine 20 to rotate according to the instruction, and drives the steel wire rope 50 hung on the main machine to rotate along with the main machine, so as to drive the car 10 fixed at one end of the steel wire rope 50 to move upwards/downwards.
When detecting a slip between the wire rope 50 and the main machine 20 of the elevator system, it is necessary to simulate an emergency braking of the elevator system in an operating state. Since the slipping between the wire 50 and the main machine 20 cannot be determined, if emergency braking is performed at a position close to the top or low floor and the wire 50 slips seriously, the car 10 stops for a long distance, and a bottom-rushing or top-rushing situation may occur. Therefore, a first safe preset position needs to be set, and emergency braking is performed on the elevator system after the car 10 moves to the first preset position at a preset speed. The first predetermined location may be a mid-floor location of a building in which the elevator system is located.
When emergency braking of the elevator system is required, the main machine 20 is generally braked by a brake. In an ideal case, that is, assuming that there is no slip between the wire rope 50 and the main machine 20, the moving distance of the car 10 is proportional to the rotating distance of the main machine 20 (the proportional relationship is a suspension ratio), and therefore, the theoretical position information of the car 10 can be calculated and acquired according to the rotating condition of the main machine 20. However, in reality, after the main machine 20 stops rotating, the car 10 will continue to move as the wire 50 slips from the main machine 20. Therefore, after the emergency stop, there is a certain difference between the actual position and the theoretical position of the car 10. After the actual position information of the car 10 is acquired, it is determined whether there is a serious slip between the wire rope 50 and the main machine 20 based on the theoretical position information and the actual position information of the car 10, thereby determining the safety of the elevator system.
In this embodiment, the preset speed may be adjusted according to the detection requirement. The emergency braking is carried out on the car 10 under the conditions of different running speeds, so that various possible emergency situations of the car 10 in the actual running process are simulated, the abrasion situations of the steel wire rope 50 and the rope grooves in the main machine 20 are evaluated, the slipping fault of the steel wire rope 50 is detected in time, and the safety accident caused by the slipping of the steel wire rope 50 in the daily application of the elevator system is avoided.
Fig. 3 is a flowchart of a method for calculating theoretical position information according to an embodiment of the present invention, which includes the following steps S310 to S320 in calculating the theoretical position information.
S310: and detecting the rotation data of the host machine through a detection device.
S320: and calculating theoretical position information of the car according to the rotation data.
In an ideal situation, no slip exists between the steel wire rope 50 and the main machine 20, the car 10 stops moving immediately after the main machine 20 stops rotating, and the moving distance of the car 10 is in direct proportion to the rotating distance of the main machine 20 (the proportional relation is a suspension ratio), so that the theoretical position information of the car 10 can be calculated and obtained according to the rotating situation of the main machine 20. The rotary encoder is a device for measuring the rotating speed, the rotary encoder is used for obtaining the rotating data of the main machine 20, then the rotating condition of the main machine is calculated according to the suspension ratio used in the elevator system, so that the moving distance of the car 10 is obtained, and the theoretical position information of the car 10 is obtained according to the initial position and the moving distance of the car 10.
Fig. 4 is a flowchart of a method for acquiring actual position information according to one embodiment of the present invention, and in one embodiment, the method for acquiring actual position information of the car 10 includes the following steps S410 to S430.
S410: and judging whether the elevator system is provided with a car absolute position detection system or not.
S420: and if the elevator system is provided with the car absolute position detection system, acquiring actual position information of the stopping position of the car through the car absolute position detection system.
S430: and if the elevator system is not provided with the car absolute position detection system, controlling the car to move to a second preset position after preset time, and acquiring actual position information of the car stop position according to the movement distance of the car from the stop position to the second preset position.
Since the car absolute position detection system 40 is not provided in all elevator systems, it is necessary to first determine whether or not the elevator system is provided with the car absolute position detection system 40 when acquiring the actual position information of the car 10. The car absolute position detecting system 40 can accurately calculate the actual moving distance of the car 10, thereby calculating the actual position information of the car 10. If the elevator system is provided with the car absolute position detection system 40, the actual position information of the car 10 can be acquired directly by the car absolute position detection system 40.
When the elevator system is not provided with the car absolute position detection system 40, the car 10 needs to be moved again. After the elevator stops the main machine and the car 10 stops moving completely, waiting for a preset time, and restarting the main machine 20 to drive the car to a second preset position. In this embodiment, the second predetermined position is the bottommost end station position. The car 10 is controlled to move and stop to the lowest end stop position in the normal operating mode. When the car 10 reaches the bottom-most end position, a lower Limit Switch (DLS) is operated to determine the actual position of the car 10.
Because the acceleration of elevator operation is smaller in order to satisfy the comfort of passengers taking the elevator in the normal operation process of the elevator, the phenomenon of slipping of the steel wire rope 50 is not obvious. After the car 10 stops at the second preset position, the rotation data of the main machine 20 between the actual position of the car 10 after emergency braking and the second preset position are obtained through the rotary encoder. The moving distance of the car 10 from the actual position after emergency braking to the second preset position can be calculated and obtained according to the rotation data at this time, and then the actual position information of the car 10 can be calculated and obtained according to the second preset position and the moving distance.
Fig. 5 is a flowchart of a method for determining whether to perform a slip detection according to an embodiment of the present invention, in which the method for detecting a slip of an elevator further includes the following steps S10 to S40 before controlling the car to move to a first preset position at a preset speed.
S10: and judging whether the current time is within a preset slip detection time period.
S20: and if the current time is within the preset slip detection time period, judging whether the elevator system is in an idle running state.
S30: and if the elevator system is in a free running state, controlling the elevator car to run to a first preset position at a preset speed.
S40: and if the current time is not in the preset slip detection time period or the elevator system is not in the idle running state, finishing the detection.
Before the elevator system performs the slip detection, it is necessary to judge whether the detection condition is satisfied. First, it is determined whether the current time is within a preset slip detection time period. The slip detection time period can be adjusted according to the practical application condition of the elevator system, for example, the slip detection time period is set to be in late night with lower use probability of the elevator, so that the slip detection is prevented from influencing the normal riding of a user; the detection period can be set according to the use frequency of the elevator, and the detection period can be quarterly/semiannually/annually or other time lengths. And if the current time is within the preset slip detection time period, judging whether the elevator system is in an idle running state.
Since the elevator system is required to be braked emergently for slip detection, the test has certain danger, so that no user exists in the car 10 during the test, and safety accidents are prevented. Only when the current time is within a preset slip detection time period and the elevator system is in an idle running state (the elevator is empty and no passenger uses the elevator for a period of time), the slip detection is carried out on the elevator system, otherwise, the detection preparation is stopped so as to avoid influencing the normal use of the user. Through the pre-judging process, the elevator system can be ensured to realize the self-checking of the sliding condition of the steel wire rope 50 at regular intervals, and meanwhile, the normal riding experience of a user is prevented from being influenced.
Fig. 6 is a flowchart of a method for determining the safety of the elevator system according to one embodiment of the present invention, where the determining the safety of the elevator system according to the theoretical position information and the actual position information includes the following steps S510 to S520.
S510: and substituting the theoretical position information and the actual position information into a steel wire rope slipping distance calculation formula to obtain the steel wire rope slipping distance.
S520: and judging the safety condition of the elevator system according to the sliding distance of the steel wire rope.
Since the wire rope 50 and the main machine 20 slip, there is a difference between the actual position information and the theoretical position information of the car 10 after the emergency stop. And calculating and obtaining the sliding distance of the steel wire rope by comparing the difference value of the theoretical position information and the actual position information. Whether a serious slip condition exists between the wire rope 50 and the main machine 20 is judged according to the wire rope slip distance, thereby judging the safety condition of the elevator system. According to the elevator slipping detection method, the slipping distance of the steel wire rope 50 of the elevator system during emergency braking is detected periodically, the abrasion condition between the steel wire rope 50 and the rope grooves in the main machine 20 is evaluated, the slipping fault of the steel wire rope can be detected in time, and the safety accident of the elevator system caused by the slipping of the steel wire rope 50 is avoided.
It should be understood that although the various steps in the flowcharts of fig. 1, 3-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 and 3-6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least some of the other steps.
In one embodiment, the calculation formula of the wire rope slip distance is:
L＝|A-B|；
wherein L is the wire rope slip distance, a is the theoretical position information, and B is the actual position information. And in the normal service period of the elevator system, when the elevator system is in an idle running state at intervals, controlling the elevator system to run to a first preset position at a preset speed, emergently braking the elevator system, and acquiring theoretical position information A and actual position information B of the car 10. And substituting the theoretical position information A and the actual position information B into the steel wire rope slipping distance calculation formula to calculate and obtain the steel wire rope slipping distance L. And evaluating the safety condition of the elevator system according to the steel wire rope slipping distance L.
In one embodiment, when the rope slip distance L is greater than the first threshold L1And judging that the elevator system has a fault. First threshold value L1The value can be taken according to the actual application condition of the elevator system, for example, according to the historical fault data of the elevator system.
In one embodiment, when the rope slip distance L is greater than the first threshold L1And when the elevator system is judged to have faults, the elevator system is controlledThe elevator is stopped to prevent emergency braking of the elevator due to other accidents, so that safety accidents are avoided.
In one embodiment, when the rope slip distance L is greater than the second threshold L2In the meantime, it is determined that there is a potential safety hazard in the elevator system, that is, although a safety failure is not caused by the slipping of the wire rope 50, the safety of the elevator may be affected if the wire rope continues to be worn. Likewise, the second threshold value L2The value of (b) can be taken according to the actual application condition of the elevator system, for example, selected according to the safety/economy and other indexes of the user to the elevator system.
In one embodiment, when the rope slip distance L is greater than the second threshold L2And when the elevator system is judged to have potential safety hazards, early warning information is sent out to inform a maintenance unit to maintain or replace the steel wire rope 50 in time. Likewise, the wire rope slip distance L is greater than the first threshold value L1And when the elevator system is judged to have a fault, alarm information can be sent out, an elevator with the abrasion fault of the steel wire rope 50 is alarmed, and a maintenance unit is informed to replace the steel wire rope 50 in time.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An elevator slip detection method, characterized by being applied to an elevator system including a car, the elevator slip detection method comprising:
controlling the lift car to run to a first preset position at a preset speed;
emergency braking the car;
calculating theoretical position information of the car;
acquiring actual position information of the car;
and judging the safety condition of the elevator system according to the theoretical position information and the actual position information.
2. The elevator slip detection method of claim 1, wherein the elevator system further comprises a host machine and a detection device, and the calculating theoretical position information of the car comprises:
detecting rotation data of the host through a detection device;
and calculating theoretical position information of the car according to the rotation data.
3. The elevator slip detection method according to claim 1 or 2, wherein the acquiring of the actual position information of the car includes:
judging whether the elevator system is provided with a car absolute position detection system or not;
if the elevator system is provided with the car absolute position detection system, acquiring actual position information of the car stopping position through the car absolute position detection system;
and if the elevator system is not provided with the car absolute position detection system, controlling the car to move to a second preset position after preset time, and acquiring actual position information of the car stop position according to the movement distance of the car from the stop position to the second preset position.
4. The elevator slip detection method according to claim 1, wherein before controlling the car to travel to a first preset position at a preset speed, the elevator slip detection method further comprises:
judging whether the current time is within a preset slip detection time period or not;
if the current time is within a preset slip detection time period, judging whether the elevator system is in an idle running state;
if the elevator system is in a free running state, controlling the elevator car to run to a first preset position at a preset speed;
and if the current time is not in the preset slip detection time period or the elevator system is not in the idle running state, finishing the detection.
5. The elevator slip detection method of claim 1, wherein said determining a safety condition of the elevator system based on the theoretical position information and the actual position information comprises:
substituting the theoretical position information and the actual position information into a steel wire rope slipping distance calculation formula to obtain a steel wire rope slipping distance;
and judging the safety condition of the elevator system according to the sliding distance of the steel wire rope.
6. The elevator slip detection method according to claim 5, wherein the calculation formula of the wire rope slip distance is:
L＝|A-B|；
wherein L is the wire rope slip distance, a is the theoretical position information, and B is the actual position information.
7. The elevator slip detection method of claim 5, wherein said determining a safety condition of the elevator system based on the wire rope slip distance comprises:
determining that the elevator system has failed when the wire rope slip distance is greater than a first threshold.
8. The elevator slip detection method according to claim 7, wherein the elevator system is controlled to stop running when it is judged that the elevator system has failed.
9. The elevator slip detection method of claim 5, wherein said determining a safety condition of the elevator system based on the wire rope slip distance further comprises:
and when the steel wire rope slipping distance is larger than a second threshold value, judging that the elevator system has potential safety hazards.
10. The elevator slip detection method of claim 9, wherein when it is determined that there is a potential safety hazard in the elevator system, outputting warning information.
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| CN114043526A (en) * | 2021-11-13 | 2022-02-15 | 深圳优地科技有限公司 | Method, device and system for testing robot brake and storage medium |
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