Elevator safety circuit detection method based on switch risk grade zoning

Abstract

The invention discloses an elevator safety circuit detection method based on switch risk level zoning, which comprises the following steps of: zoning switches of an elevator safety circuit according to risk levels, connecting the switches in each zone in series, and calibrating equivalent resistance of each zone circuit; the subarea circuits are sequentially connected into an elevator safety circuit in series according to the subarea sequence, and the voltage VT of the safety circuit is determined; connecting precision voltmeters in parallel at two ends of each subarea in sequence to measure voltage at two ends of each subarea; the equivalent resistance RT of the safety circuit is determined, the voltage drop of each partition is analyzed according to the magnitude V of the voltage measured by each precision voltmeter, and the state of the safety circuit is detected; according to the magnitude of voltage measured by the precision voltmeter, a fault generation partition is positioned, and according to the fault partition of the elevator safety circuit, the follow-up operation state of the elevator is controlled. According to the invention, the switch of the elevator safety circuit is partitioned, and the position of the failed switch of the safety circuit is judged according to the voltage drop condition of each partition, so that the quick positioning of the fault is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator control systems, and more particularly, to an elevator safety circuit detection method. Background Art

[0002] As an indispensable vertical transportation means in modern buildings, the safety of elevators is directly related to the life and property safety of passengers. The elevator safety circuit is an important part of the elevator control system. It connects multiple safety switches in series during the operation of the elevator, such as door lock switches, emergency stop switches, limit switches, etc., to quickly cut off the elevator power source when abnormal situations occur in the elevator, ensure the elevator stops running, and thus protect the safety of passengers.

[0003] However, as the usage time of the elevator increases, the switches in the safety circuit may experience poor contact or open circuit faults due to aging, wear, or external factors, affecting the normal operation and safety performance of the elevator. Secondly, with the permission of laws and regulations and the upgrade of technology, the elevator automatic restart technology has made breakthrough development. When general faults occur in the elevator, restarting the elevator can effectively eliminate most occasional faults, thereby reducing the failure rate or entrapment rate of the elevator.

[0004] Among them, the accidental disconnection of the safety circuit is one of the main reasons for elevator failures. Since the safety circuit is a loop formed by connecting mechanical switches in series, when a certain switch fails, it will cause an overall failure, and the fault location cannot be quickly located. Therefore, when a safety circuit failure occurs, only the measure of stopping the elevator for protection can be adopted, which is not conducive to reducing the elevator failure rate.

[0005] Traditional elevator safety circuit detection methods usually rely on manual checking one by one. This method is not only time-consuming and laborious, but also difficult to accurately and quickly locate the fault point. In addition, due to the large number of switches in the elevator safety circuit and their wide distribution, it is often difficult for manual detection to achieve full coverage, and potential safety hazards are easily overlooked. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects and deficiencies of the prior art, and provide an elevator safety circuit detection method based on switch risk level zoning. The switches of the elevator safety circuit are partitioned, and the fault area of the safety circuit is judged by the voltage drop situation between each partition, so as to quickly locate the fault, guide the subsequent operation of the elevator, with high detection efficiency and accuracy, and facilitate the intelligent development of the elevator.

[0007] In order to achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0008] An elevator safety circuit detection method based on switch risk level zoning, comprising the following steps:

[0009] S1: Partition the switches of the elevator safety circuit according to the risk level, connect the switches in each partition in series, and calibrate the equivalent resistance of each partition circuit;

[0010] S2: Connect each partition circuit in series into the elevator safety circuit in the order of partitions, and determine the safety circuit voltage V T ;

[0011] S3: Connect precision voltmeters in parallel at both ends of each partition in turn to measure the voltage at both ends of each partition;

[0012] S4: Determine the equivalent resistance R T of the safety circuit, and analyze the voltage drop of each partition according to the magnitude V of the voltage measured by each precision voltmeter to detect the state of the safety circuit;

[0013] S5: Locate the partition where the fault occurs according to the magnitude of the voltage measured by the precision voltmeter, and control the subsequent operating state of the elevator according to the partition of the elevator safety circuit fault.

[0014] Further, in step S1, after partitioning according to the partition order, the risk levels of the safety circuit switches in each partition gradually decrease.

[0015] Further, in step S1, the classification standard of the risk level is based on the functional attributes of the corresponding safety circuit switches, and the risk levels include: when the safety circuit switch is disconnected, the operation of the elevator will cause fatal injuries, short-distance safe operation of the elevator can be achieved through function development, redundant protection with other functions enables sustainable safe operation of the elevator, and one or more of the situations where operation is not allowed as stipulated by laws and regulations.

[0016] Further, in step S1, the number of partitions is not limited, the number of switches in each partition is independent of each other, and is greater than or equal to 1.

[0017] Further, in step S1, each partition circuit is composed of a wire and a switch connected in series.

[0018] Further, in step S3, the range of the precision voltmeter is greater than the safety circuit voltage V T , and the precision voltmeter includes one of a DC voltmeter, an AC voltmeter, and an AC / DC voltmeter, and the model parameters of the precision voltmeters are independent of each other.

[0019] Further, in step S4, the equivalent resistance R T of the safety circuit is the equivalent resistance of the safety circuit components.

[0020] Further, in step S4, according to the magnitude V of the voltage measured by the voltmeter, the state of the safety circuit is detected, including:

[0021] If the partition forms areas j, k, n, …, when the elevator is in normal operation, all switches in the safety circuit are in the closed state, and the voltage measured by the precision voltmeter is:

[0022]

[0023] In the formula, R j represents the equivalent resistance of the circuit in area j; V j represents the voltage across area j; R k represents the equivalent resistance of the circuit in area k; V k represents the voltage across area k; R n represents the equivalent resistance of the circuit in area n; V n represents the voltage across area n;

[0024] If an open - circuit fault occurs in area j, one or more safety - circuit switches in area j are disconnected, and other areas are normal. The voltage measured by the precision voltmeter is:

[0025] V j =V T

[0026] V k =V n =…=0V

[0027] If an open - circuit fault occurs in area k, one or more safety - circuit switches in area k are disconnected, and other areas are normal. The voltage measured by the precision voltmeter is:

[0028] V k =V T

[0029] V j =V n =…=0V

[0030] If open - circuit faults occur simultaneously in areas j and k of the elevator safety circuit, one or more safety - circuit switches in areas j and k are disconnected, and other areas are normal. The voltage measured by the precision voltmeter is:

[0031]

[0032] V n =…=0V

[0033] If open - circuit faults occur in more than three partitions of the elevator safety circuit, then by analogy with the above - mentioned calculation formula, the voltage measured by each precision voltmeter can be obtained.

[0034] Further, the judgment of the open - circuit fault occurring simultaneously in areas j and k of the elevator safety circuit is based on the same judgment criterion under the same type of voltmeter. The voltage measured by the precision voltmeter is proportionally distributed to the safety - circuit voltage V according to its internal resistance. T .

[0035] Further, the subsequent operating state of the elevator is determined by the partition where the fault occurs. The operating states include one or more of stopping the elevator, leveling and docking, leveling and opening the door, slow - speed driving, system restart, and maintaining normal operation.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] The present invention improves the detection efficiency. By means of partition detection, it can prioritize attention to high - risk areas, reduce over - detection of low - risk areas, and thus significantly improve the detection efficiency. At the same time, using voltage - measurement technology, it can quickly locate the fault point and reduce the time cost of manual troubleshooting.

[0038] The present invention enhances the detection accuracy. By measuring the voltage drop across both ends of each partition, it can accurately judge the state of the safety circuit. Compared with traditional manual detection methods, this method is more objective and accurate, and can effectively avoid misjudgment or missed judgment caused by human factors.

[0039] The present invention improves the safety of the elevator. By promptly discovering and handling faults in the safety circuit, this method can ensure that the elevator can quickly take safety measures such as stopping the elevator and leveling and docking when a fault occurs, thus effectively protecting the life and property safety of passengers. At the same time, regular detection and maintenance can also extend the service life of the elevator and reduce the downtime caused by faults.

[0040] The present invention promotes intelligent management. It can be combined with the intelligent management system of the elevator to realize real - time monitoring and early warning of the safety state of the elevator. Through data analysis, it can predict the trends and laws of elevator faults, provide a scientific basis for the preventive maintenance of the elevator, and further improve the safety and reliability of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic flow chart of the elevator safety - circuit detection method based on the partition of switch risk levels.

[0042] Figure 2 It is a schematic diagram of the elevator safety - circuit detection circuit in Embodiment 1.

[0043] Figure 3 It is a schematic diagram of the elevator safety - circuit detection circuit in Embodiment 2.

[0044] Figure 4 It is a schematic diagram of the elevator safety - circuit detection circuit in Embodiment 3. Detailed implementation mode

[0045] The following further describes the elevator safety circuit detection method based on switch risk level zoning of the present invention in conjunction with the accompanying drawings and specific embodiments.

[0046] Please refer to Figure 1 , the present invention discloses an elevator safety circuit detection method based on switch risk level zoning, including the following steps:

[0047] S1: Divide the switches of the elevator safety circuit into zones according to the risk level, connect the switches in each zone in series, and calibrate the equivalent resistance of each zone circuit;

[0048] S2: Connect each zone circuit in series into the elevator safety circuit in the order of the zones, and determine the safety circuit voltage V T ;

[0049] S3: Connect precision voltmeters in parallel at both ends of each zone in turn to measure the voltage at both ends of each zone;

[0050] S4: Determine the equivalent resistance R of the safety circuit T , analyze the voltage drop of each zone according to the magnitude V of the voltage measured by each precision voltmeter, and detect the state of the safety circuit;

[0051] S5: Locate the zone where the fault occurs according to the magnitude of the voltage measured by the precision voltmeter, and control the subsequent operating state of the elevator according to the zone of the elevator safety circuit fault.

[0052] Embodiment 1

[0053] Please refer to Figure 2 , a certain company's elevator conducts self - recovery function development. For safety circuit faults, function development is carried out, and risk level zoning can be achieved as follows: Area A, with a high risk level. When a fault occurs in the corresponding switch, the elevator stops immediately for protection; Area B, after function development, when a fault occurs in the corresponding switch, it can achieve safe leveling and docking near the leveling position; Area C, with a developed redundant protection function, a fault in the corresponding switch does not affect the normal operation of the elevator.

[0054] The elevator safety circuit detection method based on switch risk level zoning in this embodiment includes the following steps:

[0055] S1: Divide the switches of the elevator safety circuit into zones according to the risk level to form Area A, Area B, and Area C. Connect the switches in each of Area A, Area B, and Area C in series, and calibrate the equivalent resistance R of the circuit formed by the wire and the switch in each zone A = 2Ω, R B = 1Ω, R C = 3Ω, the equivalent resistance of the safety circuit components is R T = 10Ω;

[0056] S2: Connect each partition circuit in series into the elevator safety circuit in the order of partition A, partition B, and partition C. The voltage of the safety circuit is V T = 110V;

[0057] S3: Connect identical precision voltmeters in parallel at both ends of each partition in sequence to measure the voltage V A 、V B 、V C ;

[0058] S4: Analyze the voltage drop of each partition based on the voltage V measured by each precision voltmeter and detect the status of the safety circuit as follows:

[0059] Under normal operating conditions of the elevator, all switches in the safety circuit are in the closed state. The voltage measured by the precision voltmeter is:

[0060]

[0061] An open circuit fault occurs in partition A of the elevator safety circuit. One or more safety circuit switches in partition A are disconnected, and other partitions are normal. The voltage measured by the precision voltmeter is:

[0062] V A = V T = 110V

[0063] V B = V C = 0V

[0064] An open circuit fault occurs in partition B of the elevator safety circuit. One or more safety circuit switches in partition B are disconnected, and other partitions are normal. The voltage measured by the precision voltmeter is:

[0065] V B = V T = 110V

[0066] V A = V C = 0V

[0067] An open circuit fault occurs in both partition A and partition B of the elevator safety circuit. One or more safety circuit switches in partition A and partition B are disconnected, and other partitions are normal. The voltage measured by the precision voltmeter is:

[0068]

[0069] V C = 0V

[0070] S5: Locate the partition where the fault occurs based on the voltage measured by the precision voltmeter;

[0071] If the partition where the elevator safety circuit fault is judged is Area A, the elevator immediately enters the stop protection state; if the partition where the elevator safety circuit fault is judged is Area B, the elevator makes a landing near the floor and discharges passengers; if the partition where the elevator safety circuit fault is judged is Area C, the elevator starts up and operates normally; if the partition where the elevator safety circuit fault is judged is Areas A and B, it is processed according to the higher level, that is, the elevator immediately enters the stop protection state.

[0072] Embodiment 2

[0073] Please refer to Figure 3 , on the basis of Embodiment 1, the detection circuit is transformed, and the test principle is the same as that of Embodiment 1. Its gain lies in that the voltages measured by each voltmeter increase, which is convenient for measuring the voltages in the partitions with fewer safety switches and shorter wires. The determination in step S4 is as follows:

[0074] According to the magnitude V of the voltages measured by each precision voltmeter, analyze the voltage drops in each partition and detect the state of the safety circuit as follows:

[0075] In the normal working state of the elevator, all switches in the safety circuit are in the closed state

[0076]

[0077] An open circuit fault occurs in Area A of the elevator safety circuit, one or more safety circuit switches are disconnected, and other partitions are normal. The magnitude of the voltage measured by the precision voltmeter is:

[0078] V A =V B =V C =V T =110V

[0079] An open circuit fault occurs in Area B of the elevator safety circuit, one or more safety circuit switches are disconnected, and other partitions are normal. The magnitude of the voltage measured by the precision voltmeter is:

[0080] V B =V C =V T =110V

[0081] V A =0V

[0082] An open circuit fault occurs in both Area A and Area B of the elevator safety circuit, one or more safety circuit switches in Areas A and B are disconnected, and other partitions are normal. The magnitude of the voltage measured by the precision voltmeter is:

[0083] V B =V C =V T =110V

[0084] VA = 0V

[0085] Embodiment 3

[0086] Please refer to Figure 4 , based on Embodiment 1, an additional detection V1 is added. By measuring the cross-region voltage of different partitions, the switch with a fault can be quickly located, which is used for the fault detection of the switches that need to be monitored key points. The determination of step S4 is as follows:

[0087] If K5 has an open fault, then an open circuit fault occurs in Area B of the elevator safety circuit, and other partitions are normal. The magnitude of the voltage measured by the precision voltmeter is:

[0088] V B = V T = 110V

[0089] V A = V C = 0V

[0090] V1 = V T = 110V

[0091] Then at this time, it can be quickly determined that the safety circuit switch with a fault is K5.

[0092] In summary, the present invention has the following advantages and beneficial effects:

[0093] The present invention has precise fault location. By measuring the voltage value or current value of each partition with a voltmeter or ammeter, the partition where the fault occurs can be accurately judged, avoiding the inefficiency of relying on manual detection one by one in the traditional method, and significantly improving the speed and accuracy of fault location.

[0094] The present invention has flexible partition management. The safety circuit is flexibly partitioned according to factors such as function, space, quantity, and danger level, enabling the detection method to flexibly adapt to different types of requirements and improving the application range.

[0095] The present invention has the ability of real-time monitoring, can realize the real-time monitoring of the elevator safety circuit, timely detect potential faults, and reduce the risk of accidents. Compared with periodic manual inspections, real-time monitoring can intervene in fault troubleshooting earlier.

[0096] The present invention enhances safety. Through accurate fault location and rapid response, the elevator can be maintained and repaired in a timely manner, thereby greatly improving the overall safety of the elevator and ensuring the life safety of passengers.

[0097] The above description is a detailed description of the preferred and feasible embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications made under the technical spirit disclosed by the present invention shall fall within the scope of the patent covered by the present invention.

Claims

1. A method for detecting elevator safety circuits based on switch risk level zoning, characterized in that: The following steps are involved: S1: Divide the switches of the elevator safety circuit into zones according to the risk level, connect the switches in each zone in series, and calibrate the equivalent resistance of each zone circuit; S2: Connect each partition circuit in series to the elevator safety circuit in the partition order to determine the safety circuit voltage V T ; S3: Connect precision voltmeters in parallel at both ends of each partition to measure the voltage at both ends of each partition; S4: Determine the equivalent resistance R of the safety circuit T , according to the voltage V measured by each precision voltmeter, analyze the voltage drop of each partition and detect the status of the safety circuit; S5: Locate the fault zone according to the voltage measured by the precision voltmeter, and control the subsequent operation status of the elevator according to the zone of the elevator safety circuit fault.

2. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: In step S1, after partitioning according to the partitioning order, the risk level of the safety circuit switch of each partition gradually decreases.

3. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: In step S1, the risk level classification standard is based on the functional attributes of the corresponding safety circuit switch. The risk levels include: when the safety circuit switch is disconnected, the elevator operation will cause fatal injuries, the elevator can achieve short-distance safe operation after functional development, the elevator has redundant protection of other functions to ensure sustainable safe operation, and one or more of the following situations that are prohibited from operation as stipulated by laws and regulations.

4. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: In step S1, there is no limit on the number of partitions, and the number of switches in each partition is independent of each other and greater than or equal to 1.

5. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: In step S1, each partition circuit is formed by connecting a wire and a switch in series.

6. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: In step S3, the precision voltmeter range is greater than the safety circuit voltage V T The precision voltmeter includes a DC voltmeter, an AC voltmeter, and an AC / DC voltmeter. The model parameters of the precision voltmeter are independent of each other.

7. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: In step S4, the equivalent resistance R of the safety circuit T It is the equivalent resistance of safety circuit components.

8. The elevator safety circuit detection method based on switch risk level zoning according to claim 7 is characterized in that: In step S4, the state of the safety circuit is detected according to the voltage V measured by the voltmeter, including: If the partitions are formed into zone j, zone k, zone n, ..., when the elevator is in normal working state, the switches of the safety circuit are in the closed state, and the voltage measured by the precision voltmeter is: In the formula, R j represents the equivalent resistance of the circuit in zone j; V j Represents the voltage across region j; R k Represents the equivalent resistance of the k-zone circuit; V k Represents the voltage across the k region; R n Represents the equivalent resistance of the n-region circuit; V n It represents the voltage across the n region; An open circuit fault occurs in one of the partitions, zone j, of the elevator safety circuit. One or more safety circuit switches in zone j are disconnected, and other partitions are normal. The voltage measured by the precision voltmeter is: V j =V T V k =V n =…=0V An open circuit fault occurs in one of the partitions, zone k, of the elevator safety circuit. One or more safety circuit switches in zone k are disconnected, and other partitions are normal. The voltage measured by the precision voltmeter is: V k =V T V j =V n =…=0V The elevator safety circuit has an open circuit fault in two partitions, zone J and zone K. One or more safety circuit switches in zones J and K are disconnected, and other partitions are normal. The voltage measured by the precision voltmeter is: V n =…=0V If open circuit faults occur in more than three zones of the elevator safety circuit, the voltage measured by each precision voltmeter can be obtained by analogy using the above calculation formula.

9. The elevator safety circuit detection method based on switch risk level zoning according to claim 8 is characterized in that: The judgment of the open circuit fault in the elevator safety circuit zone j and zone k is based on the judgment of the same voltmeter model. The voltage measured by the precision voltmeter is proportional to its internal resistance. T .

10. The elevator safety circuit detection method based on switch risk level zoning according to claim 1 is characterized in that: The subsequent operating status of the elevator is determined by the partition where the fault occurs. The operating status includes one or more of stopping, stopping at the same floor, opening the door at the same floor, slow driving, system restarting, and maintaining normal operation.

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