A method for detecting a buffer state of an elevator car

Abstract

The application discloses an elevator car buffer state detection method, and particularly relates to the technical field of elevator buffer detection, and is used for solving the problem that in the existing elevator car buffer state detection process, the detection conclusion is easily affected by single working condition fluctuation, and it is difficult to accurately identify the continuous drift and early attenuation of the buffer performance. By establishing a car buffer state benchmark file corresponding to the target elevator, the actual buffer, the installation position and the load caliber one by one, and collecting the complete buffer process response sequence under the maintenance permission state, further executing segmented extraction, interval registration and state offset determination, the buffer state detection is changed from the rough judgment depending on single phenomenon observation to the continuous comparison judgment under the same gradient and working condition, thereby improving the distinguishing ability of normal fluctuation and real performance drift, enhancing the stability of the detection conclusion, and improving the identification reliability of the buffer performance attenuation.

Description

Technical Field

[0001] This invention relates to the field of elevator buffer detection technology, specifically a method for detecting the buffer state of an elevator car. Background Technology

[0002] Elevator buffers are used to absorb impact and reduce deceleration when the elevator car travels to the bottom area, and are a key component in the elevator safety protection chain. In current elevator maintenance and inspection processes, the assessment of the car's buffer status is typically based on equipment data verification, on-site visual inspection, observation of operational test results, and response performance under single maintenance conditions. Inspectors generally consider factors such as the buffer model, installation status, whether it returns to its original position after operation, and whether there are any obvious impact anomalies in the car to determine whether the buffer is still usable. This method has some practicality in routine maintenance scenarios and can meet basic status confirmation needs.

[0003] However, in actual operating environments, the buffer status of an elevator is not a static result that can be reliably judged based on a single observation. Different elevators vary in buffer model, installation location, load condition, ambient temperature, car posture, and maintenance conditions. The buffer response of the same elevator at different maintenance periods can also be affected by fluctuations in operating conditions. Current technologies often rely on single-instance test results for buffer status detection, lacking benchmarks corresponding to the specific elevator, buffer, installation location, and operating conditions. They also lack continuous processing, segmented comparison, and records of subsequent state evolution throughout the entire buffering process. In this context, slight changes in response observed during on-site testing are often difficult to determine whether they represent normal operating condition fluctuations or a sustained drift in buffer performance. Furthermore, for states that have not yet shown obvious failure but are gradually exhibiting a decay trend, it is difficult to form stable, consistent, and traceable identification conclusions.

[0004] Therefore, the more prominent problem in existing technologies lies in the lack of continuous comparison based on the same elevator and operating conditions for elevator car buffer status detection. This makes it difficult to accurately distinguish between normal fluctuations and actual performance drift during the detection process, resulting in insufficient reliability in identifying buffer performance degradation. This problem is not primarily manifested in whether a single buffer action observation can be completed, but rather in the lack of a unified standard, comparison basis, and continuous recording mechanism between different test batches, different site conditions, and different response performances. This affects the stability of the test results and the targeted nature of subsequent maintenance and repair. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for detecting the buffer state of an elevator car, thereby solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for detecting the buffer state of an elevator car, comprising: S1. Collect the buffer model, installation location, rated load range, and normal buffering process records of the target elevator to establish a car buffering status baseline file; S2. Trigger the car's downward buffer detection under the maintenance permission state, and continuously collect the process response sequence of the car approaching the buffer, contacting the buffer, compressing the buffer, disengaging from the buffer, and restoring stability. S3. Based on the contact start point, compression end point, release point and stabilization point in the process response sequence, divide the process into approach segment, contact segment, compression segment and release segment to form a set of buffer process segment segments; S4. Extract contact hysteresis, compression dissipation, release time history, lateral difference, and repetitive discreteness from the segmented fragments of the buffer process to form joint state characteristics; S5. Register the joint state characteristics to the car buffer state reference file according to the load range, temperature range, and attitude range, and calculate the state offset, continuous offset, and offset accumulation. S6. Determine the normal state, re-inspection state, decay state, and abnormal state based on the state offset, continuous offset, and cumulative offset, and write the current detection record back to the buffer state drift ledger.

[0007] Furthermore, S1 includes: Collect records of buffer model, installation location, rated load range, and normal buffering process; After sorting the normal buffer process records by their creation time, perform record source alignment, stray segment removal, and missing item verification; Then, the buffer model, installation location, rated load range, and normal buffering process records are written into the car buffering status baseline file according to the unique identification caliber of the same target elevator.

[0008] Furthermore, S2 includes: The car descent buffer detection is triggered when maintenance is permitted. A unique work identifier is generated at the moment when the maintenance downward control is established and the car first produces a continuous downward displacement. Using the maintenance operation timing record as a unified time standard, uniform time alignment is performed on the car running position record, car running speed record, buffer compression displacement record, and car vertical attitude change record; A process response sequence is formed covering the entire process from the car approaching the buffer to regaining stability.

[0009] Furthermore, S3 includes: The endpoint of the approach segment is determined based on the contact initiation point in the process response sequence; The contact segment endpoint and the compression segment endpoint are determined based on the compression endpoint. The boundaries of the re-excitation fragments are determined based on the disengagement and stabilization points; The process response sequence is continuously divided into proximity segments, contact segments, compression segments, and back-release segments under a unified time base.

[0010] Furthermore, S4 includes: Extract contact hysteresis based on proximity segments; Extract compression dissipation based on compressed segments; Extract the re-release duration based on the re-release fragments; Lateral differences were extracted based on the vertical attitude changes of the car recorded in the contact segment, compression segment, and release segment.

[0011] Furthermore, S4 also includes: Different detection records are distinguished by the unique identifier of the operation, and the contact hysteresis, compression dissipation, back-release time history and lateral difference with the same name and the same identity condition are grouped into the corresponding feature set and the repeated discrete quantity is extracted. The joint state characteristics are then formed by contact hysteresis, compression dissipation, back-release time history, lateral difference, and repeated discreteness.

[0012] Furthermore, S5 includes: Register the joint state characteristics to the car buffer state reference file according to the load range, temperature range and attitude range; The reference record that simultaneously meets the conditions of consistent load range, consistent temperature range, and consistent attitude range is determined as the registration reference item.

[0013] Furthermore, S5 also includes: The state offset is formed based on the joint state characteristics and the registration reference item; A persistent offset is generated based on the state offset in consecutive adjacent effective registrations. The offset accumulation is formed based on the historical valid state offset records.

[0014] Furthermore, S6 includes: After comparing the state offset, persistent offset, and accumulated offset item by item, a one-way judgment is performed in the order of abnormal state, decay state, re-inspection state, and normal state. The test record will be written into the buffer state drift ledger according to the unique identifier and accounting method of the same operation.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By first establishing a car buffer state baseline file that corresponds one-to-one with the target elevator, the actual buffer, the corresponding installation position, and the load diameter, and then collecting the complete process response sequence of the car approaching the buffer, contacting the buffer, compressing the buffer, disengaging from the buffer, and restoring stability under maintenance permission, and further completing segment extraction, interval registration, and state offset judgment, the buffer state detection is transformed from a rough judgment relying on single phenomenon observation to a continuous comparison judgment under the same elevator, the same buffer, and the same working conditions. This effectively solves the technical problems in the existing technology of elevator buffer state detection that make it difficult to accurately distinguish between normal fluctuations and actual performance drift, insufficient stability of detection conclusions, and difficulty in reliably identifying buffer performance decay.

[0016] 2. By dividing the process response sequence into proximity segments, contact segments, compression segments, and back-release segments, the contact hysteresis, compression dissipation, back-release time history, lateral difference, and repetitive discreteness are extracted to form joint state features. These features are then combined with continuous offset, cumulative offset, and buffer state drift ledger for continuous registration and hierarchical judgment. This enables traceable and verifiable long-term tracking of buffer state changes, improves the consistency of detection results and the pertinence of maintenance and handling, and facilitates subsequent inspection, re-inspection, and state evolution analysis. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall process of an elevator car buffer state detection method. Figure 2 A schematic diagram illustrating the process of establishing a baseline file for the car's buffer state. Figure 3 A schematic diagram of the car's downward buffer detection and process response sequence formation; Figure 4 This is a schematic diagram of joint state feature extraction and offset registration; Figure 5 This is a schematic diagram of state determination and buffer state drift ledger write-back. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example: Combined with Appendix Figures 1-5 This embodiment provides a method for detecting the buffer state of an elevator car, including: S1. Collect the target elevator's buffer model, installation location, rated load range, and normal buffering process records to establish a car buffering status baseline file. The specific implementation is as follows: First, the baseline data for the car buffer corresponding to the target elevator is merged, and then a car buffer status baseline file is formed based on this data, which can be used for subsequent testing. The target elevator refers to the single registered elevator that is currently performing car buffer status testing and establishing a car buffer status baseline file. The target elevator number is fixed and uses the whole elevator equipment number as a unique identification field, excluding other elevators in the same shaft and parallel elevators in the same group.

[0020] The model number of the buffer is obtained from the equipment's factory data, installation and acceptance data, maintenance and replacement records, and the same buffer recorded on the pit nameplate. The model number recorded in the most recent signed maintenance and replacement record is preferred as the locking value. If no replacement has occurred, the model number recorded in the installation and acceptance data is used as the locking value. If the installation and acceptance data is missing, the matching item is used as the locking value only if the pit nameplate and the factory data are consistent. The model number record must include at least the model name, buffer type, compatible rated speed range, and manufacturing batch. The model name and buffer type together constitute the main body of the model number, and the manufacturing batch is used as an auxiliary identification information. If any main field conflicts, it will not be automatically filled or overwritten, and the data processing will be stopped and the data will be transferred to the pending verification stage.

[0021] The installation location is recorded based on the unique correspondence between the fixed installation point in the pit and the center projection position of the car. On-site maintenance personnel enter the pit while the elevator is stopped for inspection, observe uniformly facing the landing door, and sequentially confirm the shaft number, target elevator number, pit side, front and rear position, and relationship with the center projection of the car. A written location description, on-site photos, and a record of the location confirmation time are then created. The installation location is only accepted based on on-site confirmation results from the physical buffer of the target elevator pit, and data from other elevators or other installation points are not accepted.

[0022] The rated load range is derived from the rated load records on the elevator nameplate, manufacturer's technical documents, and usage registration data, and combined with the actual filing requirements of the target elevator to form a load segmentation caliber. The rated load range refers to the segment range where the lower boundary is unloaded and the upper boundary is the rated load of the entire elevator. The load unit is uniformly kilograms. The interval boundary adopts a front-closed and rear-open caliber, with the upper boundary of the last segment closed. It is preferably divided into an unloaded segment, a commonly used load segment, and a high load segment. When there is a car weighing device on site and the calibration status is effective, the segmentation is based on the stable value of the weighing device. The commonly used load segment is determined based on the effective load registration distribution of the target elevator during the filing period.

[0023] When there is no effective weighing device, only the no-load section and the rated upper limit constraint are formed. The correspondence between the commonly used load section and the high load section is not automatically filled in with the estimated load value. In this case, the process is transferred to the pending record.

[0024] Normal buffering process records are original continuous records formed during the controlled buffering process of the target elevator after the buffer has been installed or replaced and approved by the maintenance personnel for maintenance buffering operations. The formation time must be within the effective time period after the most recent buffer installation or replacement and before the next disassembly and repair, and the corresponding buffer model, installation location, and rated load range have been locked for identity. The normal buffering process record must correspond to at least the target elevator identification information, buffer installation location identifier, load segment identifier, formation start and end time, and continuous record body in the same controlled buffering operation.

[0025] Before archiving, records are sorted by their creation time, followed by source alignment, removal of stray segments, and verification of missing items. Source alignment involves merging records belonging to the same target elevator, installation location, and load segment within the same controlled buffer operation into the same filing unit. Priority is given to using the same maintenance operation number or the same event identifier to establish a correspondence. If there is no unique identifier, the target elevator number, installation location, buffer start time, and buffer end time are used to form a combined correspondence. Records exceeding the preset time deviation boundary are not merged. The preset time deviation boundary is pre-set by the maintenance operation record caliber and filing caliber for the same target elevator and remains unchanged during this merging process.

[0026] Stray segment removal removes irrelevant record segments that were mistakenly acquired during the period when the elevator was stopped and not in contact with the buffer, which were not part of the controlled buffering process; non-buffered segments formed by manual maintenance and testing; and distorted segments formed during the controlled buffering process due to human emergency stops, signal interruptions, weighing failures, failure of guide rail maintenance, or failure of buffer disassembly and adjustment. The original traces are retained during removal, and the original records are not directly overwritten.

[0027] The missing item verification is carried out item by item in the order of buffer model, installation location, rated load range, and normal buffering process record. Only static fields that can be directly confirmed by the same version of equipment data are allowed to be supplemented. The source of the supplement, the time of supplementation, and the person who performed the supplementation must be recorded simultaneously. The normal buffering process record itself, the correspondence between load ranges, and the confirmation results of installation location cannot be supplemented by presumption. If there are multiple sources but they conflict with each other and cannot be uniquely identified, the case will be transferred to pending verification. If there is only a missing key source and there is no conflict and the field cannot be filled, the case will be transferred to pending supplementation.

[0028] After merging, the buffer model, installation location, rated load range, and normal buffering process records are written into the car buffering status benchmark file according to the unique identification of the same target elevator. This file is stored in the filing section of the elevator inspection record library. A method of recording one main record corresponding to multiple auxiliary records is adopted. The main record must at least include the target elevator identification, filing batch number, filing time, filing executor, data version number, and validity status. The auxiliary records are respectively linked to the buffer model, installation location, rated load range, normal buffering process records, and their evidence chain traces. The car buffering status benchmark file refers to the set of benchmark filing records corresponding to the same target elevator, which is composed of the buffer model, installation location, rated load range, and normal buffering process records.

[0029] Among them, the equipment identity version corresponds to the buffer model and installation location, the metering version corresponds to the calibration status of the weighing device, and the recording time period version corresponds to the effective formation period of the normal buffering process record. Each version is locked and cannot be replaced by another.

[0030] During writing, idempotency, ordering, and deduplication control are performed. For repeated submissions of the same target elevator, the same installation location, the same data version number, and the same filing batch, only the first successful submission result is retained. Subsequent repeated submissions only add the submission subject and submission time as traces, and do not generate parallel baseline files.

[0031] The submission order is fixed as buffer model, installation location, rated load range, and normal buffering process record. No subsequent field may be written if any preceding field is not locked. If supplementary evidence is added after the main record is formed, it is only used as supplementary record keeping and the locked main field is not directly rewritten.

[0032] The purpose of this documentation process is to provide a comparative basis for subsequent controlled buffer testing under the same elevator, buffer, installation location, and load caliber. It is applicable to the scenario of detecting the buffer status of the pit of a traction elevator car, but not applicable to situations where the buffer has been removed, the entire elevator has been out of service for a long time, or key data is missing and a corresponding relationship cannot be established.

[0033] Preferably, on a passenger elevator with a rated load of 1000 kg, the buffer model is verified to be from the same hydraulic buffer batch, the installation position is confirmed to be symmetrically arranged on both sides of the pit car center projection, and the rated load range is organized as 0 to 150 kg for no load, 300 to 700 kg for normal load, and 700 to 1000 kg for high load. The normal buffering process record is selected from the continuous records formed by the controlled buffering of the past 30 days through 3 maintenance inspections, and after the version is locked, it is written into the car buffering status benchmark file. In an alternative embodiment, the buffer model can be cross-confirmed by the pit nameplate reading result and the factory electronic ledger, and the installation position can be confirmed by the pit point measurement record and the installation acceptance image. As long as the final car buffering status benchmark file still maintains a one-to-one correspondence with the target elevator, the actual buffer, the corresponding installation position, and the load caliber, it is considered an equivalent implementation of this step.

[0034] S2. Trigger the car's downward buffer detection under maintenance clearance status, and continuously collect the process response sequence of the car approaching the buffer, contacting the buffer, compressing the buffer, disengaging from the buffer, and restoring stability. The specific implementation is as follows: First, trigger the car downward buffer detection when the target elevator has completed the car buffer status baseline file and is in the maintenance permission state. Among them, the target elevator still uses the unique identification criterion in the previous filing steps. The maintenance permission state means that the target elevator has been switched to on-site maintenance control, the landing door area has been isolated, the pit area has been cleared and confirmed, the buffer installation status has been verified on-site and is consistent with the previous filing record, and the machine room maintenance operation position and the pit observation position have completed two-point communication confirmation to form an executable state. The landing door area isolation is jointly defined by the elevator stop control record and landing door isolation signature record in the current maintenance operation. The pit area clearing confirmation is jointly defined by the pit visual confirmation record and communication feedback record. The buffer installation status consistency means that the buffer model, installation position and appearance integrity are consistent with the previous filing record. The two-point communication confirmation is continuously valid within the current maintenance operation window. If any communication fails, it is considered that the maintenance permission state is invalid. If any confirmation item is missing or conflicting, the car downward buffer detection will not be triggered, and only the unexecuted record will be retained.

[0035] The car descent buffer test is conducted by maintenance personnel within the same maintenance operation window, controlling the car to descend in a controlled manner from above the buffer according to the maintenance operation sequence. The maintenance operation window starts when the maintenance permission status is established and ends when the current buffer test is completed, manually terminated, or the maintenance permission status expires. The trigger time is fixed at the moment when the maintenance descent operation is established and the car first produces a continuous descent displacement. This moment is used to generate a unique identifier for this operation, and the target elevator number, filing batch number, buffer installation location, and operation start time are written into the header of the test record to ensure that the subsequent process response sequence is consistent with the previous car buffer status baseline file.

[0036] Continuous data acquisition begins when the car enters the predetermined approach zone above the buffer and ends when the car disengages from the buffer and returns to stability. The acquisition zone covers the complete and continuous process of the car approaching the buffer, contacting the buffer, compressing the buffer, disengaging from the buffer, and returning to stability. The on-site data acquisition sources include at least the car's running position record, car's running speed record, car's vertical attitude change record, buffer compression displacement record, and maintenance operation sequence record. Among them, the car's running position record is the main record source for this step, taken from the continuous position measurement results during the maintenance operation of the target elevator. The car's running speed record is taken from the continuous speed results formed from the same source as the position record or an independent speed record corresponding to its time. When short-term inconsistencies occur, the position record is used as the main record for comparison. Short-term inconsistencies refer to inconsistencies that do not cross any of the key time periods of contacting the buffer, compressing the buffer, disengaging from the buffer, or returning to stability. If the inconsistency continues to cross any of the key time periods, the data acquisition and processing will be stopped and the process will be transferred to the pending verification stage.

[0037] The vertical attitude change of the car is recorded in this step by using the relative height difference between the two sides of the car. The pressure displacement of the buffer is recorded by taking the continuous displacement measurement results of the buffer body during the pressure process. Its zero point is determined by the stable pressure-free period before the car contacts the buffer. The stable pressure-free period is the period during which the pressure displacement is continuously maintained within the preset small fluctuation range and not less than the preset continuous sampling points. The zero point is the fixed representative value of the pressure displacement record within the stable pressure-free period, and is used as the only zero point reference within the maintenance operation window. If the zero point fails to be established, it will not be entered into the subsequent continuous acquisition and processing.

[0038] The predetermined approach range refers to a fixed distance range extending upwards from the top of the buffer installation position determined in the previous filing. This distance range remains unchanged within the same maintenance window of the same target elevator. The approach buffer refers to the continuous downward range from when the bottom of the car enters the predetermined approach range until the first establishment of continuous mechanical contact. This range is obtained by recording the position when entering the predetermined approach range and combining the zero-position stability relationship of the pressure displacement. The contact buffer refers to the period when the bottom of the car and the top of the buffer first establish continuous contact. This period is determined by the transition of the pressure displacement from the zero-position stable segment to the continuously changing segment and combined with the continuous downward position relationship. The continuously changing segment must cross at least the preset continuous sampling points to be valid. The compression buffer refers to the period when the buffer is continuously compressed after the contact is established until the car reaches the lowest position of the controlled downward movement. This period is determined by the continuous increase of the pressure displacement or the continuous increase of the pressure within the preset fluctuation boundary, and the car running speed. The range is determined by the continuous descent and transition to the lowest position. During this period, a localized drop is allowed in the state of continuous pressure increase, but the final value must be higher than the initial value and the car must not have left the compression buffer stage. "Release from the buffer" refers to the period after the car rises from its lowest position and the continuous mechanical contact is released. This period is determined by the pressure displacement falling back to near zero and by combining the position rise relationship. If residual offset exists, falling into the preset residual allowable boundary is considered a condition for release. "Recovery and stabilization" refers to the period after the car leaves the buffer, during which position fluctuations, speed fluctuations, and relative height differences between the two sides of the car are continuously maintained within the preset stability boundary. This state must last for at least the preset holding time to be considered valid. The preset small fluctuation range, preset continuous sampling points, fixed distance range, preset residual allowable boundary, preset stability boundary, and preset holding time are all preset based on the target elevator's corresponding buffer model, installation location, maintenance requirements, and the sampling aperture within the same maintenance window, and remain unchanged throughout the entire testing process.

[0039] The names, units, and rhythms of all the above records are uniformly locked within this step. The unit for position is millimeters, the unit for velocity is millimeters per second, the unit for pressure displacement is millimeters, the unit for relative height difference between the two sides of the car is millimeters, and the unit for time is milliseconds. The continuously acquired rhythms are fixed and consistent within the same detection operation.

[0040] Before data collection, only unified time alignment is allowed. The time reference is fixed to the unified timestamp of the maintenance operation timing record. The alignment order is fixed as maintenance operation timing record, position record, speed record, pressure displacement record, and attitude change record. Records with missing timestamps exceeding a single sampling rhythm will not be automatically filled in. Records with consecutive missing timestamps that span the contact buffer, release from the buffer, or recovery stabilization critical periods will stop data collection and processing and be transferred to pending verification. When static identifier fields are missing, they can only be filled in based on the header of the detection record within the same maintenance operation window. Presumed filling in of the position record, speed record, pressure displacement record, and attitude change record body is not allowed.

[0041] During data collection and processing, only the empty travel record segment that did not enter the controlled buffer process before the maintenance operation was established and the redundant tail segment after the car returned to stability are removed. The continuous record body between approaching the buffer and returning to stability is not changed. The original record and the processed record are retained at the same time and a corresponding relationship is established.

[0042] When any of the following situations occur: maintenance operation interruption, landing door area isolation failure, pit clearing status failure, automatic operation command intervention, uncontrolled reverse movement of the car, disappearance of pressure displacement record, incompatibility between position record and operation timing, continuous directional contradiction between speed record and position record, failure of attitude change record throughout the process, failure of the car to enter the predetermined approach range, or inconsistency between the buffer installation status and the previous filing record, the current car descent buffer test will be stopped immediately. Only the header of the formed test record, the stopping time, and the original traces will be recorded, and incomplete records will not be included in the process response sequence.

[0043] After completing this step, a process response sequence corresponding to the unique identifier of this operation is formed. The process response sequence refers to the set of continuous records arranged according to a unified time base and completely covering the approach buffer start point to the recovery stabilization end point in the same car downward buffer test. Only when the continuous records completely cover the entire process and there is no interruption can a process response sequence be formed that can be called by the next stage. It is stored in the acquisition partition of the elevator test record library in chronological order. The record content includes at least the target elevator number, filing batch number, buffer installation position, operation start time, operation end time, position record, speed record, pressure displacement record, attitude change record, and maintenance operation timing record. It serves as the sole source for the next stage to form the approach segment, contact segment, compression segment, and release segment.

[0044] Preferably, on a passenger elevator with a rated load of 1000 kg, maintenance personnel, in a maintenance state, control the car to enter the approach zone 300 mm above the buffer at a downward speed not exceeding 0.25 m / s, continuously collecting rhythms set to once every 5 milliseconds to form a process response sequence with a duration of approximately 8 seconds; in an alternative embodiment, the buffer compression displacement record can be obtained by a displacement measuring device installed on the buffer body, or by a stroke measuring device mechanically linked to the buffer. As long as it still corresponds to the same downward buffer detection of the car and can continuously characterize the entire process of approaching the buffer, contacting the buffer, compressing the buffer, disengaging from the buffer, and restoring stability, it is considered an equivalent implementation of this step.

[0045] S3. Based on the contact start point, compression end point, release point, and stabilization point in the process response sequence, divide the process into approach segments, contact segments, compression segments, and release segments to form a set of segmented buffer process segments. The specific implementation is as follows: First, boundary locking is performed on the process response sequence formed and entered into the database in the previous step. Then, the buffer process segment set is formed accordingly. The process response sequence still uses the unique operation identifier and unified time base determined in the previous step. On-site maintenance and inspection personnel call the process response sequence that corresponds one-to-one with the target elevator, the filing batch number, and the buffer installation position within the same inspection batch. The process response sequence includes at least position records, speed records, pressure displacement records, attitude change records, and maintenance operation timing records. This step does not re-collect data, but only performs boundary confirmation and segment division within the range of the existing continuous records.

[0046] First, the endpoint of the approach segment is determined based on the contact start point in the process response sequence. The contact start point refers to the first valid sampling moment of the continuous change segment after the pressure displacement record transitions from the zero-position stable segment to the continuous change segment, and continuously maintains the contact buffer state to reach the preset continuous sampling point. The valid sampling moment refers to the sampling moment that has a complete timestamp, has not been eliminated by the previous stage, is not within the range of the stop tracking, and can correspond to a unified time base. The signal jump segment refers to the recording interval in which the pressure displacement record, position record, or velocity record shows a sudden change between adjacent sampling moments that does not conform to the current continuous mechanical contact process and has not continuously reached the preset continuous sampling point. If the pressure displacement change first occurs in the empty travel recording segment, signal jump segment, or stop tracking segment that has not entered the controlled buffer process, it is not considered a contact start point and is transferred to the pending verification. The approach segment refers to the continuous recording interval from the start point of the approach buffer in the process response sequence to the end of the valid sampling moment before the contact start point.

[0047] Subsequently, the contact segment endpoint and compression segment endpoint are determined based on the compression endpoint in the process response sequence. The compression endpoint refers to the termination confirmation moment after the car reaches the lowest position of the controlled descent and the pressure displacement no longer increases. This moment is jointly defined by the pressure displacement record reaching the end value of the continuous compression phase, the position record entering the lowest position formation interval, and the speed record decaying from descent to the critical state before recovery. The lowest position formation interval refers to the recording interval in which the position record enters near the lowest position during the controlled descent and remains continuously within the preset lowest position fluctuation boundary. The stable formation of the end value refers to the state in which the pressure displacement record enters the preset end value fluctuation boundary at the end of the continuous compression phase and continues to reach the preset continuous sampling point. The preset lowest position fluctuation boundary and the preset end value fluctuation boundary are preset by the target elevator corresponding buffer model, installation position, and segment registration caliber within the same test batch, and remain unchanged throughout the segment division process. When there is local fluctuation, the last effective sampling moment in the same continuous compression phase where the end value is stably formed and has not yet entered the condition for leaving the buffer is taken as the compression endpoint. Local fluctuation refers to the short-term fluctuation of the pressure displacement record during the continuous increase of pressure that does not cross the preset end value fluctuation boundary.

[0048] The contact segment refers to the continuous recording interval from the contact start point to the end of the effective sampling time before the compression segment start point. The compression segment start point refers to the first effective sampling time corresponding to the continuous pressure increase state after the pressure displacement record enters the continuous pressure increase state after the contact start point and reaches the preset continuous sampling point. The compression segment refers to the continuous recording interval from the compression segment start point to the compression end point. Thus, the contact segment and the compression segment are continuously separated and do not overlap under the same time base.

[0049] The boundaries of the back-release segments are then determined based on the departure and stabilization points in the process response sequence. The departure point refers to the first valid sampling moment when the pressure displacement record falls back to the preset residual allowable boundary after the compression endpoint and continuously maintains the departure from the buffer state until the preset continuous sampling point is reached. If the pressure displacement record falls back but the position record does not enter the recovery relationship, or the position record recovers but the pressure displacement record is still in a continuous compression state, it is not considered a departure point. The stabilization point refers to the termination confirmation moment when the position record, velocity record, and attitude change record simultaneously enter the preset stabilization boundary after the car leaves the buffer and continuously maintain it for the preset holding time. If a single out-of-bounds sampling moment occurs during the stabilization process, the holding is invalid and the calculation restarts from the next valid sampling moment thereafter.

[0050] A back-recovery segment refers to a continuous recording interval from the next valid sampling time after the end of compression to the end of the stabilization time. The reason for using the next valid sampling time after the end of compression as the starting point is to ensure that the sampling time of the end of the compressed segment belongs only to the compressed segment and avoids duplicate assignment with the back-recovery segment. The boundary sampling times of adjacent segments uniformly adopt the assignment rule of the previous segment ending and the subsequent segment starting from the next valid sampling time. This ensures that the adjacent segments, contact segments, compressed segments and back-recovery segments are continuously spliced ​​without overlap or gaps.

[0051] The above division is performed sequentially in the order of contact start point, compression end point, separation time point, and stabilization time point. The next boundary cannot be confirmed if the previous boundary is not locked. Even if the subsequent candidate boundary appears in advance, it will not take effect in advance. The stage boundary cross-inversion refers to the situation where the time order does not meet the condition that the contact start point precedes the compression end point, the compression end point precedes the separation time point, and the separation time point precedes the stabilization time point. Once this occurs, no usable segmentation result is formed. Only the boundary failure trace is retained and the process is transferred to pending verification. The boundary failure trace must include at least the name of the failed boundary, the failure time, and the source sequence identifier.

[0052] During the segmentation process, only boundary truncation and continuous segmentation of existing records are allowed under a unified time base. The original record values ​​in the process response sequence are not changed, missing records are not presumed to be filled, and stage boundaries are not manually shifted across segments.

[0053] After completing this step, a buffer process segment set is formed. The buffer process segment set refers to a continuous set of segmented records consisting of approach segments, contact segments, compression segments, and release segments, which correspond to the unique identifier of the same operation. Each segment retains the segment name, start time, end time, corresponding continuous record range, and source sequence identifier, and is stored in the segmented partition of the elevator inspection record library in chronological order. It serves as the sole source for the next step to extract contact hysteresis, compression dissipation, release time history, lateral difference, and repetitive discreteness.

[0054] Preferably, on a passenger elevator with a rated load of 1000 kg, when dividing the process response sequence of approximately 8 seconds, the approach segment is approximately 1.2 seconds, the contact segment is approximately 0.3 seconds, the compression segment is approximately 1.8 seconds, and the release segment is approximately 4.2 seconds. In an alternative embodiment, the compression endpoint can also be determined by the termination confirmation time when the end value within the least significant bit formation interval is stably formed. As long as it still maintains a unified time base corresponding to the same process response sequence and can continuously, non-overlappingly, and non-gapsily divide the approach segment, contact segment, compression segment, and release segment, it is an equivalent implementation of this step.

[0055] S4. Extract contact hysteresis, compression dissipation, back-release time history, lateral difference, and repetitive discreteness from the segmented fragments of the buffer process to form joint state features. The specific implementation is as follows: First, feature extraction is performed on the buffer process segment set formed and entered into the database in the previous step, and then joint state features are formed based on this. In this process, the maintenance and inspection personnel on site call the buffer process segment set that corresponds one-to-one with the target elevator, the filing batch number, the buffer installation location and the unique work identifier within the same inspection batch. The buffer process segment set includes at least the approach segment, contact segment, compression segment, release segment and its corresponding start time, end time, position record, speed record, pressure displacement record and attitude change record. This step does not re-collect, but only completes feature extraction within the locked segment record range.

[0056] First, contact hysteresis is extracted from the segmented segments of the buffer process. Contact hysteresis refers to the transitional characteristic from the start of the approach segment to the effective sampling time before the contact start, where the change in car position and the pressure displacement record have not yet formed a continuous correspondence. The continuous correspondence is fixed by adopting the establishment caliber of the contact start in the previous stage. The contact hysteresis is formed by the change in position and the corresponding duration within this interval. The unit of the change in position is millimeters, and the unit of the duration is milliseconds. It is registered as a dual-component feature value within the same feature record. If there are boundary failure traces between the approach segment and the contact segment, the record is missing and crosses the contact start, or the pressure displacement record has not established a unique zero-point reference, then no contact hysteresis is formed and it is transferred to the pending verification stage.

[0057] Subsequently, compression dissipation is extracted from the compression segment. Compression dissipation refers to the composite absorption characteristics formed by the buffer against the downward impact of the car within the compression segment. It is fixedly composed of the difference between the start and end points of the compressed displacement, the difference between the start and end points of the velocity decay, and the difference between the start and end points of the position travel within the interval from the start to the end of the compression segment. The difference between the start and end points of the compressed displacement is the difference between the compressed displacement record at the end of the compression segment and the compressed displacement record at the start of the compression segment; the difference between the start and end points of the velocity decay is the difference between the velocity record at the start of the compression segment and the velocity record at the end of the compression segment; and the difference between the start and end points of the position travel is the difference between the position record at the end of the compression segment and the position record at the start of the compression segment. In this step, compression dissipation is fixedly recorded as the three-component characteristic value within the same characteristic record, and no other cumulative caliber is used to replace it. If there is a mid-course reversal, a contradiction in the direction of the compressed displacement record, or an unlocked least significant bit formation interval within the compression segment, compression dissipation is not generated. The difference between the start and end points of the compressed displacement, the difference between the start and end points of the velocity decay, and the difference between the start and end points of the position travel correspond to the changes in the pressure of the buffer, the changes in the downward decay of the car, and the range of the compression process within the compression segment, respectively, and together characterize the buffer absorption state within the compression segment.

[0058] Then, the back-recovery time history is extracted from the back-recovery segment. The back-recovery time history refers to the composite duration characteristic of the car from the start of the back-recovery segment through the departure time to the stable time. It is fixed to use the back-recovery duration before departure and the stable duration after departure to form a dual-component characteristic value. The back-recovery duration before departure is taken from the unified time base difference value from the start of the back-recovery segment to the departure time, and the stable duration after departure is taken from the unified time base difference value from the departure time to the stable time. When the stable time is established only after recalculation, the stable duration after departure only takes the effective duration corresponding to the last consecutive stable interval, and does not include the previously unestablished maintenance interval. If the back-recovery segment does not completely cover the entire process from the departure time to the stable time, the back-recovery time history is not formed.

[0059] Next, lateral difference is extracted from the attitude change records in the contact segment, compression segment, and release segment. Lateral difference refers to the composite characteristic of the uneven change in the relative height difference between the two sides of the car during the buffering process. It is fixed to use the maximum lateral difference, the duration of the continuous lateral difference, and the residual lateral difference after recovery as three component feature values. The maximum lateral difference is the maximum absolute difference of the relative height difference records between the two sides of the car in the contact segment, compression segment, and release segment. The duration of the continuous lateral difference refers to the total time during which the relative height difference between the two sides of the car continuously reaches or exceeds the preset lateral difference boundary. The preset lateral difference boundary is pre-set by the target elevator corresponding to the buffer model, installation location, maintenance operation requirements, and attitude record caliber in the same test batch, and remains unchanged throughout the extraction process. The residual lateral difference after recovery is fixed to the relative height difference record value between the two sides of the car corresponding to the stable time point. If the attitude change record fails throughout any key segment, or if the relative height difference records between the two sides are mismatched with the unified time base, no lateral difference is formed.

[0060] Finally, duplicate discrete quantities are extracted. Duplicate discrete quantities refer to the discrete composite characteristics of contact hysteresis, compression dissipation, release time history, and lateral difference obtained from multiple buffer tests under the same target elevator, the same buffer installation location, the same filing batch number, the same load range, and the same maintenance operation requirements. The difference between the maximum and minimum values ​​of each component of the same feature among multiple valid test records is fixed as the discrete registration result. Among them, the same feature merging means that after distinguishing different test records according to the unique operation identifier, the contact hysteresis, compression dissipation, release time history, and lateral difference with the same name and the same identity condition are respectively grouped into the corresponding feature sets, and then the difference between the maximum and minimum values ​​of the corresponding components in each set is calculated. The preset discrete boundary is pre-set by the target elevator corresponding to the buffer model, installation location, load range, maintenance operation requirements, and feature registration caliber within the same test batch, and remains unchanged throughout the entire process of extracting duplicate discrete quantities. The extraction of duplicate discrete quantities is based on the premise of no less than two valid buffer test records. If the number of records is insufficient, duplicate discrete quantities are not formed, but the missing duplicate discrete quantity identifier and the reason for the missing are retained.

[0061] The above extraction is performed in the order of contact hysteresis, compression dissipation, back-release time history, lateral difference, and repeated discretization. The absence of preceding features does not block the extraction of subsequent features, but the reason for the absence must be recorded simultaneously. During the extraction process, corresponding record truncation, feature merging, and feature registration are only allowed within a unified time base and the boundaries of locked segments. The original record values ​​of the segments are not changed, missing records are not presumed to be filled, and records from different load ranges, different installation locations, or different filing batch numbers are not mixed for extraction.

[0062] After completing this step, a joint state feature is formed. A joint state feature is a combination of feature records that correspond to the unique identifier of the same operation and consist of contact hysteresis, compression dissipation, back-release time history, lateral difference, and repeated discrete quantity. The repeated discrete quantity is allowed to be missing. When it is missing, a joint state feature is still formed, but the missing identifier and the reason for the missing must be retained in the corresponding feature record content. Each feature is saved in the form of feature record content. The feature record content includes at least the feature name, feature component value, corresponding segment source, extraction time, and source sequence identifier, and is stored in the feature partition of the elevator detection record library in chronological order, serving as the sole source for the next step of performing baseline registration and state offset determination for the same elevator and the same working condition.

[0063] Preferably, when extracting joint state features from three effective buffer detection records under the same load range on a passenger elevator with a rated load of 1000 kg, the following can be obtained: contact hysteresis of approximately 18 mm and 120 ms; displacement start-stop difference of approximately 82 mm corresponding to compression dissipation; velocity decay start-stop difference of approximately 210 mm / s; position travel start-stop difference of approximately 95 mm; release time history of approximately 1100 ms before release and approximately 2300 ms after release; maximum lateral difference of approximately 6 mm; and the difference between the maximum and minimum values ​​of each component corresponding to the repeated discrete quantity does not exceed the preset discrete boundary locked by the same detection batch. In an alternative embodiment, the compression dissipation can also be fixedly represented by the dual-component feature record of the compression displacement start-stop difference and velocity decay start-stop difference within the compression segment. As long as it still comes from the same set of buffer process segments and can form joint state features together with the contact hysteresis, release time history, lateral difference, and repeated discrete quantity, it is considered an equivalent implementation of this step.

[0064] S5. Register the joint state characteristics to the car buffer state reference file according to the load range, temperature range, and attitude range, and calculate the state offset, continuous offset, and offset accumulation. The specific implementation is as follows: First, the joint state features that have been extracted and stored in the same inspection batch are retrieved. Then, the car buffer state reference file corresponding to the target elevator is used to perform file registration and generate offset results. On-site, maintenance and inspection personnel retrieve the joint state features that correspond one-to-one with the target elevator, file batch number, buffer installation location, and unique work identifier on the inspection record terminal. At the same time, the car buffer state reference file corresponding one-to-one with the target elevator is retrieved. This step does not re-collect data; registration and offset calculation are only performed within the scope of the locked joint state features and reference file.

[0065] First, the joint state characteristics are registered to the car buffer state reference file according to the load interval. The load interval still adopts the load segmentation caliber that has been locked in the previous filing steps. On-site, the joint state characteristics with the load segment identifier corresponding to the unique identifier of this operation are fixed as the registration entry. The same target elevator, the same buffer installation position, the same filing batch number and the same load interval reference record in the car buffer state reference file are searched. If no completely consistent load interval is found, no cross-interval substitution or presumption to fill in adjacent load intervals is performed. Only the load interval mismatch record is retained and transferred to pending verification.

[0066] Subsequently, the joint state characteristics are registered to the car buffer state baseline file according to temperature range. The temperature range refers to the segment range of ambient temperature corresponding to the pit test period during this car downward buffer test. The ambient temperature is fixedly taken from the pit ambient temperature record corresponding to the unique identifier of the test window, in degrees Celsius. The pit ambient temperature record is fixedly corresponding to the pit area where the buffer is located during this controlled buffer test. When there are multiple valid temperature record values ​​in the same test window, the arithmetic mean of the consecutive valid temperature records in the corresponding period from the contact point to the stable point is fixedly used as the entry value of this temperature range. The temperature range boundary is pre-set by the buffer model, installation location and temperature registration caliber of the target elevator corresponding to the test batch and remains unchanged throughout the registration process. The temperature range boundary is fixedly closed at the front and open at the back, with the upper boundary of the last segment closed, and is not replaced by other dates, other test windows or manually estimated temperatures. If the temperature record is missing, the temperature range boundary is not locked, or there are multiple conflicting temperature registration values ​​in the same test window, no temperature range registration result will be formed.

[0067] Next, the joint state features are registered to the car buffer state reference file according to the attitude interval. The attitude interval refers to the segmented range divided according to the maximum lateral difference component value corresponding to the lateral difference quantity in this joint state feature. On-site, the maximum lateral difference component value in the lateral difference quantity corresponding to the unique identifier of this operation is fixed and used as the attitude interval entry value. It is used to correspond to the dominant amplitude of attitude deviation during the buffering process. The attitude interval is determined within the attitude interval boundary locked in the same inspection batch, and the reference record of the same attitude interval is retrieved in the car buffer state reference file. The attitude interval boundary is pre-set by the target elevator corresponding to the buffer model, installation location, maintenance operation requirements and attitude registration caliber in the same inspection batch and remains unchanged throughout the registration process. Once the attitude interval is determined, it is used as the unique attitude caliber when registering the joint state features. If the lateral difference quantity is missing, the attitude interval boundary is not locked, or the attitude interval cannot be uniquely assigned, no attitude interval registration result is formed.

[0068] After completing the registration of load range, temperature range, and attitude range item by item, the reference record that simultaneously meets the consistency conditions of the three ranges will be determined as the registration reference item for the joint state feature. The comparison will be performed in a way that matches the feature name and feature component name item by item, without changing the original registered value of the joint state feature, without changing the reference registered value in the car buffer state reference file, and without mixing records from different filing batches, different installation locations, different load ranges, different temperature ranges, or different attitude ranges for registration. If there are multiple valid reference records under the same registration conditions, the reference record with the most recent version lock time and still in a valid state will be fixed as the reference item for this registration. Other reference records under the same conditions will only retain source traces and will not participate in this offset calculation.

[0069] After registration, the state offset is calculated. The state offset refers to the current difference record formed by subtracting the reference value of the same component from the value of each feature component of the current joint state feature. On-site, it is calculated item by item in the order of contact hysteresis, compression dissipation, back-release time history, lateral difference, and repeated discrete quantity. The state offset component records are registered separately according to the same component. The positive and negative directions of the current difference record are fixed by the sign of the current value minus the reference value. When the repeated discrete quantity is missing, the state offset is calculated only for the remaining feature components that have been formed, and the missing repeated discrete quantity mark is retained at the same time.

[0070] Subsequently, the continuous offset is calculated. The continuous offset refers to the continuous record of at least two consecutive state offset deviations that maintain the same direction under the same target elevator, the same buffer installation position, the same load range, the same temperature range, and the same attitude range. Among them, the same direction deviation means that the state offset component record formed by subtracting the reference value from the current value maintains the same sign direction in consecutive adjacent effective registrations. When the state offset component record falls within the preset zero offset boundary, it is not counted as a same direction deviation and the continuous statistics are interrupted. The preset zero offset boundary is pre-set by the buffer model corresponding to the target elevator, the installation position, and the offset registration caliber within the same inspection batch, and remains unchanged during this continuous offset calculation. On-site fixed calls are made to historical state offset records that have been entered into the database before the current inspection batch and have consistent registration conditions. After arranging them in chronological order, the deviation direction of the same name and same component state offset is checked one by one. The number of consecutive same direction deviations and the corresponding duration together constitute the dual component record of the continuous offset. If the historical state offset records are insufficient, the registration conditions are inconsistent, or the deviation direction is interrupted, only the current state offset is formed, and the continuous offset is not formed.

[0071] Finally, the offset accumulation is calculated. The offset accumulation refers to the cumulative deviation record formed by the continuous accumulation of state offset along the same sign direction after multiple consecutive effective registrations of the same target elevator and the same buffer installation position. Among them, effective registration refers to the registration result in which the load range, temperature range, and attitude range are all locked and the registration reference item is uniquely determined. On-site, the historical effective state offset record is fixed as the basis, and the accumulation direction and accumulation magnitude are registered separately according to the same name and component. The accumulation direction is fixed to be represented by the sign direction of the current value minus the reference value, and the accumulation magnitude is fixed to be represented by the algebraic continuous accumulation value of the same-direction effective state offset component record. Only the state offset component record that does not fall into the preset zero offset boundary and maintains the same-direction deviation is accumulated. When there is a reverse deviation, the state offset component record falls into the preset zero offset boundary, the registration condition is switched, the filing batch is changed, or the installation position is changed, the original accumulation chain is terminated and recalculated. Different accumulation chains are not merged for registration. Among them, the continuous offset is used to characterize the degree of continuation of the same-direction offset in continuous detection, and the offset accumulation is used to characterize the degree of accumulation of the same-direction offset in continuous detection.

[0072] The above registration and calculation are performed in the order of load range, temperature range, attitude range, state offset, continuous offset, and offset accumulation. The next calculation will not be performed if the previous item is not locked. During the sorting process, only corresponding retrieval, merging of the same name and registration of difference are allowed for existing joint state feature records, car buffer state reference records and historical offset records. No presumed completion is made for interval boundaries, reference records or historical offset records.

[0073] After completing this step, an offset registration record corresponding to the unique identifier of this operation is generated. The offset registration record refers to a single registration record in the registration record set that corresponds to the unique identifier of the same operation and is composed of the load range, temperature range, attitude range and corresponding offset results used for registration. The offset registration record includes at least the load range, temperature range, attitude range used for registration, corresponding reference record identifier, state offset, continuous offset, offset accumulation and formation time, and is stored in the registration partition of the elevator inspection record library in chronological order, serving as the sole source for the next step of performing normal state, re-inspection state, attenuation state and abnormal state determination.

[0074] Preferably, on a passenger elevator with a rated load of 1000 kg, when the load range corresponding to this test is 300 to 700 kg, the temperature range is 15 to 25 degrees Celsius, and the attitude range is 0 to 8 mm, after the joint state features are registered in the same range, the contact hysteresis state offset of about 4 mm and 35 milliseconds, the displacement start-stop difference state offset of the compression dissipation of about 6 mm, and the stabilization time after separation of the release time history of about 180 milliseconds can be obtained. After three consecutive deviations in the same direction, a continuous offset is formed, and after five consecutive accumulations in the same direction, an offset accumulation is formed. In an alternative embodiment, the temperature range can also be fixed by segmenting the environmental temperature registration value during the detection period of the target elevator pit. As long as it still corresponds to the unique identifier of the same operation and can complete the unique registration of the car buffer state reference file together with the load range and attitude range, it is considered an equivalent implementation of this step.

[0075] S6. Based on the state offset, continuous offset, and cumulative offset, determine the normal state, re-inspection state, decay state, or abnormal state, and write the current detection record back to the buffer state drift ledger. The specific implementation is as follows: First, within the same inspection batch, retrieve the offset registration records that have been registered and stored. Then, perform a status determination based on the locked state offset, continuous offset, and offset accumulation. Write the current inspection record back to the buffer state drift ledger. On-site, maintenance and inspection personnel retrieve the offset registration records that correspond one-to-one with the target elevator, filing batch number, buffer installation location, and unique work identifier on the inspection record terminal. The offset registration records must include at least the load range, temperature range, attitude range, corresponding reference record identifier, state offset, continuous offset, offset accumulation, and formation time. This step does not involve re-collection or re-registration; it only completes the determination of normal state, re-inspection state, attenuation state, and abnormal state within the locked offset registration records.

[0076] First, the current deviation degree is confirmed based on the state offset. The state offset is still recorded using the difference between the current value and the reference value from the previous step. On-site, the state offset component records are read item by item in the order of contact hysteresis, compression dissipation, release time history, lateral difference, and repeated discreteness, and each component is compared with the corresponding state judgment boundary. The state judgment boundary is set and compared separately for the same component. The buffer model, installation location, load range, temperature range, and attitude range of the target elevator are pre-set and version locked. The normal boundary, re-inspection boundary, attenuation boundary, and abnormal boundary are used for hierarchical comparison in the order of normal boundary, re-inspection boundary, attenuation boundary, and abnormal boundary. The normal boundary, re-inspection boundary, attenuation boundary, and abnormal boundary are arranged in order of the allowable deviation range of the same component from widest to strictest, and remain unchanged within the same test batch. When all the formed state offset component records fall within the normal boundary, and the continuous offset and deviation When the cumulative offset amount has not reached the upgrade boundary, it is judged as a normal state; when any state offset component record exceeds the normal boundary but does not reach the attenuation boundary, and neither the continuous offset nor the cumulative offset amount reaches the attenuation upgrade boundary, it is judged as a re-inspection state; when any state offset component record reaches the attenuation boundary but does not reach the abnormal boundary, or the continuous offset reaches the continuous attenuation upgrade boundary, or the cumulative offset amount reaches the cumulative attenuation upgrade boundary, it is judged as an attenuation state; when any state offset component record reaches the abnormal boundary, or the continuous offset reaches the continuous abnormal upgrade boundary, or the cumulative offset amount reaches the cumulative abnormal upgrade boundary, it is judged as an abnormal state. Among them, the re-inspection state corresponds to a single deviation exceeding the normal range but not yet forming evidence of continuous degradation; the abnormal state corresponds to a single deviation reaching the abnormal boundary or the continuous offset and cumulative offset amount reaching the abnormal upgrade boundary; and the attenuation state corresponds to a single deviation reaching the attenuation boundary or forming evidence of continuous degradation.

[0077] Subsequently, continuous deviation confirmation is performed based on the continuous offset. The continuous offset still adopts the dual-component record formed by at least two consecutive same-direction deviations in the previous step. The continuous number component and the duration component are read on-site and compared with the continuous attenuation upgrade boundary and continuous abnormal upgrade boundary set separately under the same version. Among them, the continuous judgment boundary is pre-set and version locked by the target elevator corresponding buffer model, installation location and continuous registration caliber in the same inspection batch. The continuous number and duration must meet the corresponding level boundary at the same time to trigger the status upgrade of that level. If either component does not reach the corresponding level boundary, the status upgrade will not be triggered. If the historical status offset record is insufficient to form a continuous offset, only the continuous offset missing mark is retained and no status upgrade is performed based on it.

[0078] Then, cumulative deviation confirmation is performed based on the offset cumulative amount. The offset cumulative amount still adopts the cumulative deviation record formed by the algebraic continuous accumulation of the same direction effective state offset component record in the previous step. The cumulative direction and cumulative amplitude are read on site and compared with the cumulative attenuation upgrade boundary and cumulative abnormal upgrade boundary set separately under the same version. Among them, the cumulative judgment boundary is pre-set by the target elevator corresponding buffer model, installation position and cumulative registration caliber in the same inspection batch and the version is locked. The offset cumulative amount only triggers the state upgrade of the corresponding level when the cumulative direction is consistent with the same sign direction and the cumulative amplitude reaches the corresponding level boundary. The cumulative chain that is recalculated after the occurrence of reverse deviation, zero offset interruption, filing batch switch or installation position switch is not merged with the previous cumulative chain.

[0079] After comparing the state offset, continuous offset, and cumulative offset item by item, the unidirectional judgment is performed in a fixed order of abnormal state, decay state, re-inspection state, and normal state. Once the higher-level state is established, the subsequent judgment stops and no further degraded judgment is performed.

[0080] If any of the following situations exist: missing state offset spanning key feature components, invalid registration reference item, conflicting continuous offset direction records, or interrupted offset accumulation chain without recalculation, or if the offset registration record corresponding to the unique identifier of the same operation is inconsistent in the load range, temperature range, attitude range, registration reference item identifier, or any offset record, thus constituting contradictory offset registration records, then no final state determination result will be formed. Only the determination failure record will be retained and the process will be transferred to pending verification.

[0081] After the status determination is completed, the test record is written back to the buffer status drift ledger. The buffer status drift ledger is a dedicated record ledger that continuously records the status drift results of each test according to the target elevator, buffer installation location, and filing batch number. On-site, the unique identifier of this operation, load range, temperature range, attitude range, reference record identifier, status offset, continuous offset, cumulative offset, final status determination result, determination time, and determination version number are written into the same ledger entry in the order of the aforementioned fields. The source offset registration record identifier and the current writing time are also retained. Among them, the determination version number is used to identify the status determination boundary, continuous determination boundary, and cumulative determination used in this status determination. The rule version corresponding to the boundary is not mixed with the data version number, equipment identity version, metering version, and recording time period version; when writing back, the same unique identifier of the same operation is used for the unique accounting caliber. Duplicate submissions are only attached to the original ledger entry as auxiliary trace records and do not generate parallel judgment entries. The auxiliary trace records must at least include the subject of the duplicate submission, the time of the duplicate submission, and the corresponding original ledger entry identifier. Historical ledger entries that have completed version locking are not directly overwritten by this write-back. New entries are only added to the original ledger, thereby ensuring that the buffer state drift ledger can continuously reflect the drift trajectory of the same target elevator buffer state as the inspection batch changes, and serve as the sole ledger source for subsequent maintenance verification and re-inspection.

[0082] Preferably, on a passenger elevator with a rated load of 1000 kg, when the load range corresponding to this test is 300 to 700 kg, the temperature range is 15 to 25 degrees Celsius, the attitude range is 0 to 8 mm, and the contact hysteresis state offset is 4 mm and 35 milliseconds, the displacement start-stop difference state offset in compression dissipation is 6 mm, and the stabilization time state offset after separation is 180 milliseconds, after three consecutive deviations in the same direction and a cumulative total of five deviations in the same direction, it can be determined as a decay state, and the test record, along with the corresponding offset registration record identifier, is written back to the buffer state drift ledger. In an alternative embodiment, the state determination can also be fixed by using a unidirectional priority determination caliber of first comparing the abnormal boundary, then comparing the decay boundary, and finally comparing the re-inspection boundary. As long as the unique determination of normal state, re-inspection state, decay state, and abnormal state is still based on the state offset, continuous offset, and offset accumulation, and the test record is continuously written to the buffer state drift ledger, it is an equivalent implementation of this step.

[0083] In the operational scenario shown in this embodiment, the overall operation process of the method of the present invention is illustrated using a traction passenger elevator in a residential building as an example. The elevator has a rated load of 1000 kg, and two hydraulic buffers are installed in the pit of the car. During the quarterly special inspection, the maintenance unit performs car buffer status detection on the target buffer corresponding to the projection of the car center.

[0084] Before the inspection began, maintenance personnel first retrieved the entire elevator's equipment files, installation and acceptance documents, maintenance and replacement records, and pit nameplate records while the elevator was stopped for maintenance. They then verified the buffer model of the target elevator, confirming that the current buffer model matched the most recent replacement confirmation record. Next, they entered the pit, facing the landing door, and confirmed that the target buffer was located at the corresponding installation point to the right of the car's center projection, creating a written description and taking photos of the location. Based on the elevator's nameplate rated load, usage registration data, and the effective calibration status of the car's weighing device, they organized the rated load range into 0 to 150 kg for no-load and 150 kg for normal-load operation. The system is divided into three segments: 300-700 kg load and 700-1000 kg high load. Next, the original continuous records from three controlled buffering operations within the last 30 days are selected and sorted by formation time. Source alignment is achieved for elevators with the same target, installation location, and load segment. Mistakes in the empty travel segment before maintenance and distorted segments caused by emergency stops are removed. After verifying each field, the buffer model, installation location, rated load range, and normal buffering process record are written into the car buffering status baseline file. Corresponding master and subsidiary records are then generated in the elevator inspection record database.

[0085] After the record is completed, the maintenance personnel establish two-point communication and confirmation between the machine room maintenance control position and the pit observation position. After the landing door area is sealed off, the pit is cleared, and the buffer installation status is verified, the maintenance permission status is formed. In this status, the machine room maintenance personnel establish maintenance downward control. When the car descends continuously for the first time, a unique identifier for this operation is generated, and the target elevator number, record batch number, buffer installation position, and operation start time are written in.

[0086] Subsequently, the car enters the predetermined approach range 300 mm above the buffer at a maintenance speed not exceeding 0.25 m / s. The detection system synchronously acquires position records, speed records, pressure displacement records, relative height difference records on both sides of the car, and maintenance operation timing records at a uniform acquisition rhythm of once every 5 milliseconds, and completes alignment using the maintenance operation timing records as a unified time base. Before the car contacts the buffer, a zero-position reference is established in the pressureless range where the pressure displacement maintains a stable small fluctuation.

[0087] As the car continues to descend, the position record shows that it has entered the predetermined approach range, and the pressure displacement record remains at zero stable, thus forming the approach buffer stage. When the pressure displacement changes from the zero stable segment to the continuously changing segment and continues to reach the preset continuous sampling point, the contact start point is locked. As the car continues to descend, the pressure displacement continues to increase, the speed gradually decreases, and finally enters the lowest position formation range. After the pressure displacement end value stabilizes, the compression end point is locked. Then the car rises, and the pressure displacement falls back to within the preset residual allowable boundary and remains established, locking the departure point. When the position, speed, and relative height difference between the two sides of the car simultaneously return to the preset stable boundary and remain continuously for the preset holding time, the stabilization point is locked.

[0088] Based on the above four boundary time points, the system divides the current process response sequence into approach segment, contact segment, compression segment, and release segment, and generates a set of buffer process segment segments within the segmented partition.

[0089] Subsequently, contact hysteresis was extracted from the approach segment, yielding a position change of 18 mm and a corresponding duration of 120 ms; compression dissipation was extracted from the compression segment, yielding a pressure displacement start-stop difference of 82 mm, a velocity decay start-stop difference of 210 mm / s, and a position travel start-stop difference of 95 mm; the recovery time history was extracted from the recovery segment, yielding a recovery duration of 1100 ms before separation and a stabilization duration of 2300 ms after separation; lateral difference was then extracted from the attitude change records in the contact, compression, and recovery segments, yielding a maximum lateral difference of 6 mm, a duration of continuous lateral difference, and the corresponding component values ​​of the residual lateral difference after recovery; combined with the results of the first two valid detections of the target elevator under the same load range, the difference between the maximum and minimum values ​​of each corresponding feature component was calculated to form a repeated discrete quantity, and a joint state feature corresponding to the unique identifier of this operation was generated within the feature partition.

[0090] After feature extraction, the system calls the car buffer state reference file. First, it completes the load interval registration according to the common load segment. Then, it determines the temperature interval by the arithmetic mean of the continuous effective temperature records from the contact point to the stabilization point during the pit detection period. It determines the attitude interval by the maximum side difference component value. Under the condition that the three intervals are consistent at the same time, the corresponding reference record is retrieved as the registration reference item. Then, it compares the current joint state feature with the reference value of the same name and component in the registration reference item to form the state offset. For example, the contact hysteresis offset is 4 mm and 35 ms, the displacement start and stop difference in the compression dissipation is 6 mm, and the stabilization time after separation in the release time history is 180 ms. Then, combined with the historical offset records of the same installation position, the same load interval, the same temperature interval, and the same attitude interval of the target elevator, it is confirmed that the above-mentioned components have maintained the same direction deviation for 3 consecutive times, forming a continuous offset. After accumulating in the same direction for 5 consecutive times, an offset accumulation is formed.

[0091] Finally, the system calls the locked state determination boundary, continuous determination boundary, and cumulative determination boundary to compare the state offset, continuous offset, and offset cumulative amount in sequence: Since some state offset components have reached the decay boundary, and the continuous offset has reached the continuous decay upgrade boundary, and the offset cumulative amount has also reached the cumulative decay upgrade boundary, but has not reached the abnormal boundary and abnormal upgrade boundary, after unidirectional determination in the order of abnormal state, decay state, re-inspection state, and normal state, the detection result of this test is determined to be the decay state.

[0092] The system then writes the unique identifier of this operation, load range, temperature range, attitude range, reference record identifier, state offset, continuous offset, offset accumulation, final state judgment result, judgment time, and judgment version number into the buffer state drift ledger, adds one new entry to the original ledger, and retains the source offset registration record identifier and the writing time.

[0093] At this point, the car buffer status test of the target elevator is complete. On-site maintenance personnel can then use the continuously recorded status change trajectory in the drift log to arrange subsequent inspections, maintenance adjustments, or replacements of the target buffer.

[0094] All calculations involved in the embodiments are dimensionless numerical calculations, and the preset parameters and thresholds in the calculations are set by those skilled in the art according to the actual situation.

[0095] It should be noted that this invention can be deployed on the device itself to realize embedded applications, or it can run on a PC or other terminal with a user interface, thereby meeting various hardware environments and usage requirements.

[0096] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wireless or wired transmission; wired transmission methods include optical fiber, twisted pair, coaxial cable, etc.; wireless transmission includes infrared, microwave, etc. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center containing one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0097] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and modules described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0099] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0100] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0101] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0102] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0103] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for detecting the buffer state of an elevator car, characterized in that, include: S1. Collect the buffer model, installation location, rated load range, and normal buffering process records of the target elevator to establish a car buffering status baseline file; S2. Trigger the car's downward buffer detection under the maintenance permission state, and continuously collect the process response sequence of the car approaching the buffer, contacting the buffer, compressing the buffer, disengaging from the buffer, and restoring stability. S3. Based on the contact start point, compression end point, release point and stabilization point in the process response sequence, divide the process into approach segment, contact segment, compression segment and release segment to form a set of buffer process segment segments; S4. Extract contact hysteresis, compression dissipation, release time history, lateral difference, and repetitive discreteness from the segmented fragments of the buffer process to form joint state characteristics; S5. Register the joint state characteristics to the car buffer state reference file according to the load range, temperature range, and attitude range, and calculate the state offset, continuous offset, and offset accumulation. S6. Determine the normal state, re-inspection state, decay state, and abnormal state based on the state offset, continuous offset, and cumulative offset, and write the current detection record back to the buffer state drift ledger.

2. The method for detecting the buffer state of an elevator car according to claim 1, characterized in that, S1 includes: Collect records of buffer model, installation location, rated load range, and normal buffering process; After sorting the normal buffer process records by their creation time, perform record source alignment, stray segment removal, and missing item verification; Then, the buffer model, installation location, rated load range, and normal buffering process records are written into the car buffering status baseline file according to the unique identification caliber of the same target elevator.

3. The elevator car buffer state detection method according to claim 1, characterized in that, S2 include: The car descent buffer detection is triggered when maintenance is permitted. A unique work identifier is generated at the moment when the maintenance downward control is established and the car first produces a continuous downward displacement. Using the maintenance operation timing record as a unified time standard, uniform time alignment is performed on the car running position record, car running speed record, buffer compression displacement record, and car vertical attitude change record; A process response sequence is formed covering the entire process from the car approaching the buffer to regaining stability.

4. The method for detecting the buffer state of an elevator car according to claim 1, characterized in that, S3 includes: The endpoint of the approach segment is determined based on the contact initiation point in the process response sequence; The contact segment endpoint and the compression segment endpoint are determined based on the compression endpoint. The boundaries of the re-excitation fragments are determined based on the disengagement and stabilization points; The process response sequence is continuously divided into proximity segments, contact segments, compression segments, and back-release segments under a unified time base.

5. The elevator car buffer state detection method according to claim 1, characterized in that, S4 include: Extract contact hysteresis based on proximity segments; Extract compression dissipation based on compressed segments; Extract the re-release duration based on the re-release fragments; Lateral differences were extracted based on the vertical attitude changes of the car recorded in the contact segment, compression segment, and release segment.

6. The method for detecting the buffer state of an elevator car according to claim 5, characterized in that, S4 also includes: Different detection records are distinguished by the unique identifier of the operation, and the contact hysteresis, compression dissipation, back-release time history and lateral difference with the same name and the same identity condition are grouped into the corresponding feature set and the repeated discrete quantity is extracted. The joint state characteristics are then formed by contact hysteresis, compression dissipation, back-release time history, lateral difference, and repeated discreteness.

7. The elevator car buffer state detection method according to claim 1, characterized in that, S5 include: Register the joint state characteristics to the car buffer state reference file according to the load range, temperature range and attitude range; The reference record that simultaneously meets the conditions of consistent load range, consistent temperature range, and consistent attitude range is determined as the registration reference item.

8. The method for detecting the buffer state of an elevator car according to claim 7, characterized in that, S5 also includes: The state offset is formed based on the joint state characteristics and the registration reference item; A persistent offset is generated based on the state offset in consecutive adjacent effective registrations. The offset accumulation is formed based on the historical valid state offset records.

9. The elevator car buffer state detection method according to claim 1, characterized in that, S6 include: After comparing the state offset, persistent offset, and accumulated offset item by item, a one-way judgment is performed in the order of abnormal state, decay state, re-inspection state, and normal state. The test record will be written into the buffer state drift ledger according to the unique identifier and accounting method of the same operation.

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