Elevator flexible body monitoring system

Abstract

The invention discloses an elevator flexible body monitoring system which comprises a detection part connected with the end of a flexible body and used for detecting the acting force of the part, located below the detection part, of the flexible body acting on the detection part; the first acquisition part is used for acquiring the position of the elevator car; the calculation part is used for calculating a reference value according to the position of the elevator car, and the reference value refers to the acting force of the part, located below the detection part, of the flexible body acting on the detection part when the flexible body is not abnormal; a first determination unit that determines a reference range on the basis of the reference value; and the judging part is used for judging that the flexible body is not abnormal when the detection result of the detecting part is within the reference range, and otherwise, judging that the flexible body is abnormal. The elevator flexible body monitoring system can timely and accurately detect abnormal conditions such as hooking, winding and the like between the flexible body in an elevator system and other devices in a hoistway.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and in particular to a monitoring system for detecting the safety of flexible bodies such as accompanying cables and compensation chains in an elevator system during the lifting and lowering movement of an elevator car in a hoistway. Background Art

[0002] In the elevator system, in order to realize the transmission of power and signals between the elevator control cabinet and the car, a traveling cable is usually configured; at the same time, in order to eliminate the imbalance caused by the deadweight of the main rope of the elevator, a compensation chain is usually configured. The traveling cable and the compensation chain have several common points: 1) They are flexible bodies that can be bent arbitrarily; 2) One end of them is fixed at the bottom of the car; 3) During the operation of the elevator, there will be a certain degree of shaking due to the shaking of the building (such as earthquakes, strong winds, etc.). This shaking of the flexible body may cause the flexible body to hook, scratch, and entangle with other devices in the hoistway. Such hooking and entanglement may not only cause the flexible body to be disconnected due to excessive force, but also seriously threaten the safety of the elevator operation. Therefore, it is necessary to monitor the abnormalities such as hooking, scratching, and entanglement between the flexible body (such as: traveling cables and compensation chains) in the elevator system and other devices in the hoistway in real time.

[0003] In response to the abnormal monitoring problem of the above-mentioned flexible body, Document 1 (CN202310680547.X) proposes: the load applied to the car by the compensation chain when the unmanned car is on the uppermost floor is set as the first reference value, and the load applied to the car by the compensation chain when the unmanned car is on the lowermost floor is set as the second reference value, and when the actual load applied to the car by the compensation chain during the operation of the elevator exceeds the second reference value, it is determined that the compensation chain is abnormally stuck, and when the actual load applied to the car by the compensation chain during the operation of the elevator is less than the first reference value, it is determined that the compensation chain is abnormally cut. Although this scheme can detect the abnormality of the compensation chain being stuck and cut by using the actual load value applied to the car by the compensation chain, it can be seen from the setting method of the first reference value and the second reference value as the judgment basis that the judgment basis is very conservative, which leads to the following disadvantages:

[0004] 1. There is a high possibility of missed detection. For example, when the compensation chain is cut off abnormally, if the part of the compensation chain under the car is very long after being cut off, that is, the ratio between the distance between the breakpoint and the end point on one side of the car and the total length of the compensation chain is close to 1, then the solution in Reference 1 will miss detection.

[0005] 2. The timeliness of detection is low. For example, when the car is stuck when going up from a lower position in the well, the load applied to the car by the part of the compensation chain located at the lower part of the car is much smaller than the first reference value. Therefore, when the abnormality of sticking just occurs, the pulling force generated by the abnormality of sticking is relatively small. At this time, the sum of the pulling force and the load applied to the car by the part of the compensation chain located at the lower part of the car is still less than the first reference value. Therefore, the detection system can no longer detect the abnormality of the compensation chain in a timely manner. It needs to wait until the small part continues to go up so that the pulling force continues to increase until the sum of the pulling force and the load applied to the car by the part of the compensation chain located at the lower part of the car increases to the first reference value before it can be detected. Such a delay in detection may cause the consequences of the abnormality to become more serious.

[0006] Therefore, how to timely and accurately detect abnormalities such as hooking, scratching, and entanglement between the flexible body in the elevator system and other devices in the hoistway has become a technical problem to be solved. Summary of the invention

[0007] The technical problem to be solved by the present invention is how to timely and accurately detect abnormalities such as hooking, scratching, entanglement, etc. between the flexible body in the elevator system and other devices in the hoistway.

[0008] In order to solve the above technical problems, the present invention discloses an elevator flexible body monitoring system, comprising: a detection unit, connected to the end of the flexible body, for detecting the force of the part of the flexible body located below the detection unit acting on the detection unit; a first acquisition unit, for acquiring the position of the elevator car; a calculation unit, for calculating a reference value according to the position of the elevator car, wherein the reference value refers to the force of the part of the flexible body located below the detection unit acting on the detection unit when the flexible body is not abnormal; a first determination unit, for determining a reference range according to the reference value; and a judgment unit, for judging that the flexible body is not abnormal when the detection result of the detection unit is within the reference range, otherwise, the flexible body is judged to be abnormal.

[0009] Preferably, the calculation unit calculates the reference value according to the following steps:

[0010] Step T1, determining a first length of a portion of the flexible body located below the detection portion according to the position of the elevator car;

[0011] Step T2, calculating a first mass of a portion of the flexible body located below the detection portion according to the linear density of the flexible body and the first length;

[0012] Step T3, calculating the gravity exerted on the portion of the flexible body located below the detection portion according to the first mass;

[0013] Step T4: taking the gravity as the reference value and outputting it.

[0014] Preferably, the first determining unit shifts a preset offset amount along at least one offset direction based on the reference value, and determines the reference range according to the offset direction.

[0015] Preferably, when the offset is only in one direction, the first determination unit uses the interval formed by the reference value and the points where it is offset as the reference range; when the offset is in two directions at the same time, the first determination unit uses the interval formed by the points where the reference value is offset as the reference range.

[0016] Preferably, when the monitoring result is greater than the first boundary, the judgment unit determines that the flexible body is abnormally stuck; when the monitoring result is less than the second boundary, the judgment unit determines that the flexible body is abnormally disconnected; when the monitoring result is between the first boundary and the second boundary, the judgment unit determines that the flexible body is not abnormal; the first boundary is the larger of the two boundaries of the reference range, and the second boundary is the smaller of the two boundaries of the reference range.

[0017] Preferably, the elevator flexible body monitoring system further comprises: a second acquisition unit, used to acquire the acceleration and moving direction of the elevator car; a first adjustment unit, used to adjust the reference value output by the calculation unit and / or the detection result of the detection unit according to the acceleration and moving direction;

[0018] The first adjustment unit adjusts the reference value in the following manner: first, the adjustment force is calculated according to the first mass and the acceleration using Newton's second law; then, when the moving direction is upward, the sum of the reference value and the adjustment force is used as the adjusted reference value; when the moving direction is downward, the difference obtained by subtracting the adjustment force from the reference value is used as the adjusted reference value;

[0019] The first adjustment unit adjusts the detection result in the following manner: first, the adjustment force is calculated according to the first mass and the acceleration using Newton's second law; then, when the moving direction is upward, the difference obtained by subtracting the adjustment force from the detection result is used as the adjusted detection result; when the moving direction is upward, the sum of the detection result and the adjustment force is used as the adjusted detection result.

[0020] Preferably, the elevator flexible body monitoring system also includes: a second determination unit, used to determine whether the flexible body is shaking according to the detection result of the detection unit, and further determine the shaking condition of the flexible body when determining the shaking; a second adjustment unit, used to adjust the reference range and / or the detection result of the detection unit according to the shaking condition of the flexible body.

[0021] Preferably, the second determining unit determines whether the flexible body is shaking according to the following steps, and further determines the shaking condition of the flexible body when determining that the flexible body is shaking:

[0022] Step 1. Select a specified time period;

[0023] Step 2: determining a first elevator car position corresponding to the start time of the specified time period and a second elevator car position corresponding to the end time of the specified time period;

[0024] Step 3, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0025] Step 4, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period;

[0026] Step 5, subtracting the gravity change from the detection result within the specified time period, and taking the obtained difference as the first difference;

[0027] Step 6: Determine a constant value component in the first difference, and subtract the constant value component from the first difference to obtain a second difference;

[0028] Step 7: When the second difference exceeds a threshold, it is determined that the flexible body is shaking, otherwise it is determined that there is no shaking;

[0029] Step 8: When it is determined in step 7 that the flexible body is shaking, determine the shaking condition of the flexible body according to the second difference.

[0030] Preferably, the length of the specified time period is such that the second difference value at least includes a complete positive portion and a complete negative portion connected thereto.

[0031] Preferably, the shaking condition includes the shaking amplitude, and the second adjustment unit first determines the two boundaries of the reference range, and then respectively moves the two boundaries in the direction of expanding the reference range, and the moving distance is the sum of the shaking amplitude and a non-negative adjustment margin, thereby achieving adjustment of the reference range.

[0032] Preferably, the shaking condition includes a shaking cycle, and the second adjustment unit adjusts the detection result of the detection unit according to the shaking cycle according to the following rule:

[0033] According to the shaking cycle of the flexible body, the first position of the current moment in the shaking cycle is determined, and according to the first position, the shaking change of the detection result at the current moment is determined. The difference obtained by subtracting the shaking change of the detection result from the detection result at the current moment is used as the final detection result at the current moment. The shaking change of the detection result is the difference obtained by subtracting the detection result when the flexible body shakes at the current moment from the detection result when there is no shaking.

[0034] Preferably, the second adjustment unit determines the shaking change amount of the detection result at the current moment according to the following steps:

[0035] Step S1, determining a detection result corresponding to the first position within a shaking period of the flexible body;

[0036] Step S2, subtracting the constant value component of the shaking period from the detection result corresponding to the first position to obtain a first difference;

[0037] Step S3, determining a moment corresponding to the first position within the shaking period of the flexible body, and taking it as a specific moment;

[0038] Step S4, taking the specific time and the current time as the designated time period;

[0039] Step S5, determining the first elevator car position corresponding to the start time of the specified time period and the second elevator car position corresponding to the end time period;

[0040] Step S6, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0041] Step S7, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period;

[0042] Step S8, calculating the change in gravity between a specific moment and a current moment by using the linear density of the flexible body and the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0043] Step S9, subtracting the gravity change obtained in step S5 from the first difference, and using the obtained difference as the shake change of the detection result.

[0044] The present invention also provides an elevator flexible body monitoring system, comprising: a detection unit, connected to the end of the flexible body, for detecting the force acting on the detection unit by the part of the flexible body located below the detection unit; a third acquisition unit, for acquiring the position of the elevator car; a reference value calculation unit, for calculating a reference value based on the elevator car position information, wherein the reference value refers to the force acting on the detection unit by the part of the flexible body located below the detection unit when the flexible body is not abnormal; a difference calculation unit, for obtaining a third difference by subtracting the reference value from the detection result of the detection unit; and a judgment unit, for judging that the flexible body is abnormal when the third difference is greater than a third threshold value, otherwise judging that the flexible body is not abnormal, and the third threshold value is a positive real number.

[0045] Preferably, the elevator flexible body monitoring system further comprises: a fourth acquisition unit, used for acquiring the acceleration of the elevator car; and a third adjustment unit, used for adjusting the third threshold value according to the acceleration.

[0046] Preferably, the third adjustment unit calculates the adjustment force according to the third mass of the portion of the flexible body located below the detection unit and the acceleration using Newton's second law, and uses the sum of the reference value and the adjustment force as the adjusted third threshold.

[0047] Preferably, the elevator flexible body monitoring system also includes: a fifth determination unit, used to determine whether the flexible body is shaking according to the detection result of the detection unit, and further determine the shaking condition of the flexible body when determining the shaking; a fourth adjustment unit, used to adjust the third threshold according to the shaking condition of the flexible body.

[0048] Beneficial technical effects

[0049] The elevator flexible body monitoring system of the present invention can timely and accurately detect abnormalities such as hooking, scratching, entanglement, etc. between the flexible body in the elevator system and other devices in the hoistway. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a structural schematic diagram of an elevator flexible body monitoring system according to Example 1;

[0051] Figure 2 Schematic diagram of the elevator structure when the flexible body is a traveling cable in Example 1;

[0052] Figure 3 This is a schematic diagram of the elevator structure when the flexible body in Example 1 is a compensation chain. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment discloses an elevator flexible body monitoring system, including: a detection unit, connected to the end of the flexible body, for detecting the force of the part of the flexible body located below the detection unit acting on the detection unit; a first acquisition unit, for acquiring the position of the elevator car; a calculation unit, for calculating a reference value according to the elevator car position, the reference value refers to the force of the part of the flexible body located below the detection unit acting on the detection unit when the flexible body is not abnormal; a first determination unit, for determining a reference range according to the reference value; a judgment unit, for judging that the flexible body is not abnormal when the detection result of the detection unit is within the reference range, otherwise, the flexible body is judged to be abnormal.

[0056] The calculation unit calculates the reference value according to the following steps: Step T1, determining the first length of the portion of the flexible body below the detection unit based on the position of the elevator car; Step T2, calculating the first mass of the portion of the flexible body below the detection unit based on the linear density of the flexible body and the first length; Step T3, calculating the gravity exerted on the portion of the flexible body below the detection unit based on the first mass; Step T4, taking the gravity as the reference value and outputting it.

[0057] The first determining unit shifts a preset offset amount along at least one offset direction based on the reference value, and determines the reference range according to the offset direction.

[0058] Specifically, when the offset is only in one direction, the first determination unit uses the interval formed by the reference value and the point where it is offset as the reference range; when the offset is in two directions at the same time, the first determination unit uses the interval formed by the point where the reference value is offset as the reference range.

[0059] When the monitoring result is greater than the first boundary, the judgment unit determines that the flexible body is abnormally stuck; when the monitoring result is less than the second boundary, the judgment unit determines that the flexible body is abnormally disconnected; when the monitoring result is between the first boundary and the second boundary, the judgment unit determines that the flexible body is not abnormal; the first boundary is the larger of the two boundaries of the reference range, and the second boundary is the smaller of the two boundaries of the reference range.

[0060] Take the flexible body as an example, such as the accompanying cable Figure 2As shown, the traction wheel 4 drives the car 1 and the counterweight 3 to move up and down in the hoistway through the traction rope 2, and one end of the accompanying cable 6 is fixed to the fixing device 7 on the hoistway wall, and the other end is fixed to the bottom of the car through the detection unit 5. The detection unit 5 detects the force of the part of the accompanying cable 6 located below the car acting on the car (or the detection unit 5) due to the action of gravity. The detection unit 5 detects the force and outputs the detection result corresponding to the force. Of course, the detection unit can also be set on the fixing device 7, and is used to detect the force of the part of the accompanying cable 6 located below the fixing device 7 acting on the fixing device 7 (or the detection unit 5) due to the action of gravity.

[0061] Take the flexible body as compensation chain as an example, Figure 3 As shown, one end of the compensation chain 6 is fixed to the lower part of the counterweight 3, and the other end is fixed to the bottom of the car 1 (or the detection part 5) through the detection part 5. The detection part 5 detects the force of the part of the compensation chain 6 located below the car acting on the car (or the detection part 5) due to the action of gravity. The detection part 5 detects the force and outputs the detection result corresponding to the force. Of course, the detection part 5 can also be set at the lower part of the counterweight 3, and is used to detect the force of the part of the compensation chain 6 located below the counterweight 3 acting on the counterweight 3 (or the detection part 5) due to the action of gravity.

[0062] The specific implementation of the detection unit can refer to the reference 1 Figure 2 The corresponding descriptions in Figure 4 and the specification are not repeated here.

[0063] The elevator flexible body monitoring system disclosed in this embodiment determines the reference value and reference range according to the elevator car position information, so that the reference range changes with the change of the elevator car position, which greatly improves the accuracy of the judgment basis for determining whether an abnormality occurs in the flexible body. Therefore, it can significantly improve the accuracy and timeliness of determining whether the flexible body is hooked, scratched, entangled, or other abnormalities.

[0064] Example 2

[0065] This embodiment is similar to Embodiment 1, and only the differences are described below.

[0066] The elevator flexible body monitoring system also includes:

[0067] A second acquisition unit is used to acquire the acceleration of the elevator car (a positive acceleration indicates that the elevator car is in an accelerated running state, and a negative acceleration indicates that the elevator car is in a decelerated running state) and the moving direction;

[0068] a first adjustment unit, configured to adjust the reference value output by the calculation unit and / or the detection result of the detection unit according to the acceleration and the moving direction;

[0069] The first adjustment unit adjusts the reference value in the following manner: first, the adjustment force is calculated according to the first mass and the acceleration using Newton's second law; then, when the moving direction is upward, the sum of the reference value and the adjustment force is used as the adjusted reference value; when the moving direction is downward, the difference obtained by subtracting the adjustment force from the reference value is used as the adjusted reference value;

[0070] The first adjustment unit adjusts the detection result in the following manner: first, the adjustment force is calculated according to the first mass and the acceleration using Newton's second law; then, when the moving direction is upward, the difference obtained by subtracting the adjustment force from the detection result is used as the adjusted detection result; when the moving direction is upward, the sum of the detection result and the adjustment force is used as the adjusted detection result.

[0071] The elevator flexible body monitoring system of this embodiment further takes into account the force exerted on the car by the flexible body during acceleration or deceleration during elevator operation (i.e., the force exerted on the detection part by the part of the flexible body below the detection part), and adjusts the reference value (reference range) and / or the detection result according to the acceleration. Therefore, the accuracy and timeliness of detecting whether the flexible body is hooked, scratched, entangled, or other abnormalities can be significantly improved.

[0072] Example 3

[0073] In fact, the flexible body installed in the shaft will have different degrees of shaking due to the swaying of the building caused by strong winds, earthquakes, etc. Even if the building does not sway, the flexible body may also shake to a certain extent simply because of the lifting and lowering of the car in the shaft. The shaking of the flexible body indicates that it not only moves in the vertical direction, but also in the horizontal direction. The shaking of the flexible body, that is, its movement in the horizontal direction, makes it dangerous to get hooked, scratched, entangled, etc. with other devices in the shaft. Therefore, it is precisely because of the shaking of the flexible body that it is necessary to monitor the flexible body for abnormalities such as hooking, scratching, and entanglement. In other words, if the shaking of the flexible body is not taken into account, there is no need to monitor the flexible body for abnormalities such as hooking, scratching, and entanglement. Document 1 obviously implements abnormal monitoring of the compensation chain while ignoring the shaking of the flexible body, which makes its solution have great room for improvement.

[0074] Based on the above-mentioned embodiments, this embodiment further considers the influence of the shaking of the flexible body on monitoring, and provides an adjustment method based on shaking compensation.

[0075] The elevator flexible body monitoring system of this embodiment also includes:

[0076] a second determining unit, configured to determine whether the flexible body is shaking according to the detection result of the detecting unit, and further determine the shaking condition of the flexible body when the shaking is determined;

[0077] The second adjustment unit is used to adjust the reference range and / or the detection result of the detection unit according to the shaking of the flexible body.

[0078] The second determining unit determines whether the flexible body is shaking according to the following steps, and further determines the shaking condition of the flexible body when determining that the flexible body is shaking:

[0079] Step 1. Select a specified time period;

[0080] Step 2: determining a first elevator car position corresponding to the start time of the specified time period and a second elevator car position corresponding to the end time of the specified time period;

[0081] Step 3, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0082] Step 4, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period;

[0083] Step 5, subtracting the gravity change from the detection result within the specified time period, and taking the obtained difference as the first difference;

[0084] Step 6: determine a constant value component in the first difference (for example, calculate an average value, a median, a mean square value, etc.), and subtract the constant value component from the first difference to obtain a second difference;

[0085] Step 7: When the second difference exceeds a threshold, it is determined that the flexible body is shaking, otherwise it is determined that there is no shaking;

[0086] Step 8: When it is determined in step 7 that the flexible body is shaking, determine the shaking condition of the flexible body according to the second difference.

[0087] The length of the specified time period should be such that the second difference contains at least a complete positive part and a complete negative part connected to it; or further, the time interval between the two endpoints of the specified time period that is closest to the current moment and the current moment is less than the time threshold.

[0088] The shaking condition includes the shaking amplitude, and the second adjustment unit first determines the two boundaries of the reference range, and then respectively moves the two boundaries in the direction of expanding the reference range, and the moving distance is the sum of the shaking amplitude and a non-negative adjustment margin, thereby achieving adjustment of the reference range.

[0089] The shaking condition includes a shaking cycle, and the second adjustment unit adjusts the detection result of the detection unit according to the shaking cycle as follows: determine the first position of the current moment in the shaking cycle according to the shaking cycle of the flexible body, determine the shaking change of the detection result at the current moment according to the first position, and subtract the shaking change of the detection result from the detection result at the current moment as the final detection result at the current moment. The shaking change of the detection result is the difference between the detection result of the flexible body when there is shaking and the detection result when there is no shaking at the current moment, that is, the part of the detection result corresponding to the shaking of the flexible body.

[0090] The second adjustment unit determines the shaking change amount of the detection result at the current moment according to the following steps:

[0091] Step S1, determining a detection result corresponding to the first position within a shaking period of the flexible body;

[0092] Step S2, using the detection result corresponding to the first position to subtract the constant value component of the shaking period (for example, calculating the average value, median, mean square value, etc.), to obtain a first difference;

[0093] Step S3, determining a moment corresponding to the first position within the shaking period of the flexible body, and taking it as a specific moment;

[0094] Step S4, taking the specific time and the current time as the designated time period;

[0095] Step S5, determining the first elevator car position corresponding to the start time of the specified time period and the second elevator car position corresponding to the end time period;

[0096] Step S6, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0097] Step S7, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period;

[0098] Step S8, calculating the change in gravity between a specific moment and a current moment by using the linear density of the flexible body and the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0099] Step S9, subtracting the gravity change obtained in step S5 from the first difference, and using the obtained difference as the shake change of the detection result.

[0100] The elevator flexible body monitoring system of this embodiment, based on the previous embodiment, further considers the influence of the shaking of the flexible body on the monitoring result of the detection unit, and uses the shaking situation to adjust the detection result and / or the reference range, so that the abnormality of the flexible body can be monitored more accurately and timely.

[0101] Example 4

[0102] This embodiment provides an elevator flexible body monitoring system different from the above-mentioned embodiment, comprising:

[0103] A detection portion connected to the end of the flexible body and used to detect a force acting on the detection portion by a portion of the flexible body located below the detection portion;

[0104] A third acquisition unit, used to acquire the position of the elevator car;

[0105] a reference value calculation unit, which calculates a reference value according to the elevator car position information, wherein the reference value refers to a force exerted on the detection unit by a portion of the flexible body located below the detection unit when the flexible body is not abnormal;

[0106] a difference calculation unit, which obtains a third difference by subtracting the reference value from the detection result of the detection unit;

[0107] The judging unit determines that the flexible body is abnormal when the third difference (when the third difference is a negative number, it refers to its absolute value) is greater than a third threshold, otherwise it determines that the flexible body is not abnormal, and the third threshold is a positive real number.

[0108] Example 5

[0109] This embodiment further considers the influence of the angular velocity of the car on the basis of the fourth embodiment.

[0110] The elevator flexible body monitoring system also includes:

[0111] A fourth acquisition unit, used to acquire the acceleration of the elevator car;

[0112] The third adjustment unit adjusts the third threshold value according to the acceleration.

[0113] The third adjustment unit calculates an adjustment force according to the third mass of the portion of the flexible body located below the detection unit and the acceleration using Newton's second law, and uses a sum of the reference value and the adjustment force as an adjusted third threshold.

[0114] Example 6

[0115] This embodiment further considers the influence of the shaking of the flexible body on the basis of Embodiment 4 or 5.

[0116] The elevator flexible body monitoring system also includes:

[0117] a fifth determining unit, configured to determine whether the flexible body is shaking according to the detection result of the detecting unit, and further determine the shaking condition of the flexible body when the shaking is determined;

[0118] The fourth adjustment unit is used to adjust the third threshold value according to the shaking condition of the flexible body.

[0119] The fifth determining unit determines whether the flexible body is shaking according to the following steps, and further determines the shaking condition of the flexible body when it is determined that the flexible body is shaking;

[0120] Step 1. Select a specified time period;

[0121] Step 2: determining a first elevator car position corresponding to the start time of the specified time period and a second elevator car position corresponding to the end time of the specified time period;

[0122] Step 3, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period;

[0123] Step 4, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period;

[0124] Step 5, subtracting the gravity change from the detection result within the specified time period, and taking the obtained difference as the first difference;

[0125] Step 6: determine a constant value component in the first difference, and subtract the constant value component from the first difference to obtain a second difference;

[0126] Step 7: When the second difference exceeds a threshold, it is determined that the flexible body is shaking, otherwise it is determined that there is no shaking;

[0127] Step 8: When it is determined in step 7 that the flexible body is shaking, determine the shaking condition of the flexible body according to the second difference.

[0128] The shaking condition includes a shaking amplitude, and the fourth adjustment unit uses the sum of the shaking amplitude and the third threshold as the adjusted third threshold.

[0129] The elevator flexible body monitoring system disclosed in the present invention is to monitor the abnormalities such as hooking and scratching of the flexible body (mainly referring to the accompanying cable or compensation chain) in the elevator system, and the monitoring method is to use the detection part to monitor the force of the part of the flexible body located below the detection part due to the gravity acting on the detection part, and then appropriately process the monitored force. Specifically, embodiments 1 and 4 implement flexible body abnormality monitoring based on the car position information, embodiments 2 and 5 implement flexible body abnormality monitoring based on the car position information and acceleration information, embodiment 3 implements flexible body abnormality monitoring based on the car position information and flexible body shaking information, and embodiment 6 implements flexible body abnormality monitoring based on the car position information, car acceleration information and flexible body shaking information. Embodiment 3 is the first best embodiment of the present application, and flexible body abnormality monitoring is implemented based on the car position information, car acceleration information and flexible body shaking information. Embodiments 1 and 2 can be obtained by appropriately simplifying the first best embodiment. Embodiment 6 is the second best embodiment of the present application, and flexible body abnormality monitoring is implemented based on the car position information, car acceleration information and flexible body shaking information.

[0130] Embodiment 4 and Embodiment 5 are obtained by appropriately simplifying the second best embodiment.

[0131] This application is very similar to Document 1 (202310680547.X) in the background technology. Both of them monitor the flexible body (Document 1 is defined as the compensation chain) in the elevator system for abnormalities such as hooking, entanglement, etc., and both are based on the force applied by the flexible body to the detection part when the flexible body is hooked or other abnormalities occur - that is, the detection result of the detection part, to achieve abnormal monitoring of the flexible body. The difference is that Document 1 is based on the force when the car is located at the top and bottom of the shaft as the reference value, while this application takes into account the influence of the car position, car acceleration and the shaking of the flexible body on the monitoring results, and uses the car position, car acceleration and shaking of the flexible body to determine or adjust the reference range and / or monitoring results, thereby being able to more accurately and timely monitor the occurrence of abnormalities such as hooking of the flexible body.

Claims

1. An elevator flexible body monitoring system, characterized in that: include: A detection portion connected to the end of the flexible body and used to detect a force acting on the detection portion by a portion of the flexible body located below the detection portion; A first acquisition unit, used to acquire the position of the elevator car; a calculation unit, which calculates a reference value according to the elevator car position, wherein the reference value refers to a force exerted on the detection unit by a portion of the flexible body located below the detection unit when the flexible body is not abnormal; A first determining unit, which determines a reference range according to the reference value; The judging unit determines that the flexible body is not abnormal when the detection result of the detecting unit is within the reference range, and otherwise determines that the flexible body is abnormal.

2. The elevator flexible body monitoring system according to claim 1, characterized in that: The calculation unit calculates the reference value according to the following steps: Step T1, determining a first length of a portion of the flexible body located below the detection portion according to the position of the elevator car; Step T2, calculating a first mass of a portion of the flexible body located below the detection portion according to the linear density of the flexible body and the first length; Step T3, calculating the gravity exerted on the portion of the flexible body located below the detection portion according to the first mass; Step T4: taking the gravity as the reference value and outputting it.

3. The elevator flexible body monitoring system according to claim 1, characterized in that: The first determining unit shifts a preset offset amount along at least one offset direction based on the reference value, and determines the reference range according to the offset direction.

4. The elevator flexible body monitoring system according to claim 3, characterized in that: When the offset is only in one direction, the first determination unit uses the interval formed by the reference value and the point where it is offset as the reference range; when the offset is simultaneously in two directions, the first determination unit uses the interval formed by the point where the reference value is offset as the reference range.

5. The elevator flexible body monitoring system according to claim 1, characterized in that: When the monitoring result is greater than a first boundary, the judging unit judges that the flexible body is abnormally stuck; when the monitoring result is less than a second boundary, the judging unit judges that the flexible body is abnormally disconnected; When the monitoring result is between the first boundary and the second boundary, the judging unit determines that no abnormality occurs to the flexible body; The first boundary is a larger one of two boundaries of the reference range, and the second boundary is a smaller one of two boundaries of the reference range.

6. The elevator flexible body monitoring system according to claim 1, characterized in that: The elevator flexible body monitoring system also includes: A second acquisition unit, used to acquire the acceleration and moving direction of the elevator car; a first adjustment unit, configured to adjust the reference value output by the calculation unit and / or the detection result of the detection unit according to the acceleration and the moving direction; The first adjustment unit adjusts the reference value in the following manner: first, the adjustment force is calculated according to the first mass and the acceleration using Newton's second law; then, when the moving direction is upward, the sum of the reference value and the adjustment force is used as the adjusted reference value; when the moving direction is downward, the difference obtained by subtracting the adjustment force from the reference value is used as the adjusted reference value; The first adjustment unit adjusts the detection result in the following manner: first, the adjustment force is calculated according to the first mass and the acceleration using Newton's second law; then, when the moving direction is upward, the difference obtained by subtracting the adjustment force from the detection result is used as the adjusted detection result; when the moving direction is upward, the sum of the detection result and the adjustment force is used as the adjusted detection result.

7. The elevator flexible body monitoring system according to claim 1 or 6, characterized in that: The elevator flexible body monitoring system also includes: a second determining unit, configured to determine whether the flexible body is shaking according to the detection result of the detecting unit, and further determine the shaking condition of the flexible body when the shaking is determined; The second adjustment unit is used to adjust the reference range and / or the detection result of the detection unit according to the shaking of the flexible body.

8. The elevator flexible body monitoring system according to claim 7, characterized in that: The second determining unit determines whether the flexible body is shaking according to the following steps, and further determines the shaking condition of the flexible body when determining that the flexible body is shaking: Step 1. Select a specified time period; Step 2: determining a first elevator car position corresponding to the start time of the specified time period and a second elevator car position corresponding to the end time of the specified time period; Step 3, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period; Step 4, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period; Step 5, subtracting the gravity change from the detection result within the specified time period, and taking the obtained difference as the first difference; Step 6: determine a constant value component in the first difference, and subtract the constant value component from the first difference to obtain a second difference; Step 7: When the second difference exceeds a threshold, it is determined that the flexible body is shaking, otherwise it is determined that there is no shaking; Step 8: When it is determined in step 7 that the flexible body is shaking, determine the shaking condition of the flexible body according to the second difference.

9. The elevator flexible body monitoring system according to claim 8, characterized in that: The length of the specified time period is such that the second difference value at least includes a complete positive value portion and a complete negative value portion connected thereto.

10. The elevator flexible body monitoring system according to claim 7, characterized in that: The shaking condition includes the shaking amplitude, and the second adjustment unit first determines the two boundaries of the reference range, and then respectively moves the two boundaries in the direction of expanding the reference range, and the moving distance is the sum of the shaking amplitude and a non-negative adjustment margin, thereby achieving adjustment of the reference range.

11. The elevator flexible body monitoring system according to claim 8, characterized in that: The shaking condition includes a shaking period, and the second adjustment unit adjusts the detection result of the detection unit according to the shaking period in the following manner: According to the shaking cycle of the flexible body, the first position of the current moment in the shaking cycle is determined, and according to the first position, the shaking change of the detection result at the current moment is determined. The difference obtained by subtracting the shaking change of the detection result from the detection result at the current moment is used as the final detection result at the current moment. The shaking change of the detection result is the difference obtained by subtracting the detection result when the flexible body shakes at the current moment from the detection result when there is no shaking.

12. The elevator flexible body monitoring system according to claim 11, characterized in that: The second adjustment unit determines the shaking change amount of the detection result at the current moment according to the following steps: Step S1, determining a detection result corresponding to the first position within a shaking period of the flexible body; Step S2, subtracting the constant value component of the shaking period from the detection result corresponding to the first position to obtain a first difference; Step S3, determining a moment corresponding to the first position within the shaking period of the flexible body, and taking it as a specific moment; Step S4, taking the specific time and the current time as the designated time period; Step S5, determining the first elevator car position corresponding to the start time of the specified time period and the second elevator car position corresponding to the end time period; Step S6, calculating the difference between the first elevator car position and the second elevator car position, and using the difference as the change in the first length of the portion of the flexible body located below the detection portion within the specified time period; Step S7, calculating the corresponding gravity change amount by using the linear density of the flexible body and the change amount of the first length of the portion of the flexible body located below the detection part within the specified time period; Step S8, calculating the change in gravity between a specific moment and a current moment by using the linear density of the flexible body and the change in the first length of the portion of the flexible body located below the detection portion within the specified time period; Step S9, subtracting the gravity change obtained in step S5 from the first difference, and using the obtained difference as the shake change of the detection result.

13. An elevator flexible body monitoring system, characterized in that: include: A detection portion connected to the end of the flexible body and used to detect a force acting on the detection portion by a portion of the flexible body located below the detection portion; A third acquisition unit, used to acquire the position of the elevator car; a reference value calculation unit, which calculates a reference value according to the elevator car position information, wherein the reference value refers to a force exerted on the detection unit by a portion of the flexible body located below the detection unit when the flexible body is not abnormal; a difference calculation unit, which obtains a third difference by subtracting the reference value from the detection result of the detection unit; The judging unit determines that the flexible body is abnormal when the third difference is greater than a third threshold value, otherwise determines that the flexible body is not abnormal, and the third threshold value is a positive real number.

14. The elevator flexible body monitoring system according to claim 13, characterized in that: The elevator flexible body monitoring system also includes: A fourth acquisition unit, used to acquire the acceleration of the elevator car; The third adjustment unit adjusts the third threshold value according to the acceleration.

15. The elevator flexible body monitoring system according to claim 14, characterized in that: The third adjustment unit calculates an adjustment force according to the third mass of the portion of the flexible body located below the detection unit and the acceleration using Newton's second law, and uses a sum of the reference value and the adjustment force as an adjusted third threshold.

16. The elevator flexible body monitoring system according to claim 13 or 14, characterized in that: The elevator flexible body monitoring system also includes: a fifth determining unit, configured to determine whether the flexible body is shaking according to the detection result of the detecting unit, and further determine the shaking condition of the flexible body when the shaking is determined; The fourth adjustment unit is used to adjust the third threshold value according to the shaking condition of the flexible body.

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