Elevator safety circuit detection method based on switch partition

Abstract

The invention discloses an elevator safety circuit detection method based on switch partitioning, which comprises the following steps: partitioning a switch of an elevator safety circuit, sequentially connecting the switch into a circuit in series according to a partitioning sequence, and determining the voltage VT of the safety circuit; resistors are sequentially connected in parallel to the two ends of each partition; connecting a voltmeter in parallel with two ends of the safety loop, or connecting an ampere meter in series with each subarea loop; the equivalent resistance RT of a safety circuit component is determined, and the state of the safety circuit is detected according to the magnitude V of the voltage measured by the voltmeter or the magnitude of the current measured by the ampere meter; according to the magnitude V of the voltage measured by the voltmeter or the magnitude of the current measured by the ampere meter, the fault occurrence partition is positioned. The elevator safety circuit is reasonably partitioned, the voltage or current measuring technology is adopted, the state of the elevator safety circuit can be more efficiently and accurately detected, faults can be found and positioned in time, and the safety and reliability of an elevator are improved.

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 important part of modern urban infrastructure, elevators are widely used in high-rise buildings, shopping malls, hospitals, stations and other places, providing convenient vertical transportation services for people. With the acceleration of urbanization, the usage frequency and quantity of elevators are increasing continuously, and the safety of elevators has attracted more and more attention.

[0003] The elevator safety circuit is the core component of the elevator safety system. The safety circuit is usually composed of a series of safety switches connected in series, such as upper and lower limit switches, emergency stop switches, speed limiter switches, etc. Its working principle is to monitor the state of the elevator in real time during the operation of the elevator. When the system detects abnormal situations, such as overload, doors not closed properly, emergency braking, etc., the safety circuit will quickly cut off the power supply or take other safety measures to ensure the life safety of passengers.

[0004] However, traditional elevator safety circuit detection methods often rely on manual inspection, visual observation or simple electrical tests. These methods are not only inefficient, but also prone to missing some potential faults, increasing safety hazards. Summary of the Invention

[0005] 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 zoning. By reasonably zoning the elevator safety circuit and using voltage or current measurement techniques, the state of the elevator safety circuit can be detected more efficiently and accurately, faults can be discovered and located in a timely manner, and the safety and reliability of the elevator are improved.

[0006] In order to achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0007] An elevator safety circuit detection method based on switch zoning, comprising the following steps:

[0008] S1: Zone the switches of the elevator safety circuit, and sequentially connect them in series into the circuit according to the zoning order to determine the safety circuit voltage V T ;

[0009] S2: Connect resistors in parallel at both ends of each zone in turn;

[0010] S3: Connect a voltmeter in parallel at both ends of the safety circuit, or connect an ammeter in series into each zone circuit;

[0011] S4: Determine the equivalent resistance R of the safety circuit components T, detect the status of the safety circuit according to the magnitude V of the voltage measured by the voltmeter or according to the magnitude of the current measured by the ammeter;

[0012] S5: Locate the fault-occurring partition according to the magnitude V of the voltage measured by the voltmeter or according to the magnitude of the current measured by the ammeter.

[0013] Furthermore, the criteria for partitioning the safety circuit switches include one or more of function, space, quantity, and the risk level involved in the switches.

[0014] Furthermore, 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.

[0015] Furthermore, the number of parallel resistors is the same as the number of partitions, and the magnitudes of the resistances of each resistor are independent of each other.

[0016] Furthermore, in step S3, the range of the voltmeter is greater than the voltage V of the safety circuit T , and the voltmeter includes one of a DC voltmeter, an AC voltmeter, and an AC / DC voltmeter.

[0017] Furthermore, in step S3, the range of the ammeter is greater than the current of the safety circuit, and the ammeter includes one of a DC ammeter, an AC ammeter, and an AC / DC ammeter.

[0018] Furthermore, in step S4, the voltmeter is used to detect the partition fault, ignoring the wire resistance and the internal resistance of the voltmeter.

[0019] Furthermore, detecting the status of the safety circuit according to the magnitude V of the voltage measured by the voltmeter includes:

[0020] If partitions form areas j, k, n, …, in the normal working state of the elevator, all switches in the safety circuit are in the closed state, and the magnitude of the voltage measured by the voltmeter is:

[0021] V = 0V;

[0022] When an open-circuit fault occurs in one partition j of the elevator safety circuit, one or more safety circuit switches in area j are disconnected, and other partitions are normal. The magnitude of the voltage measured by the voltmeter is:

[0023]

[0024] where R j represents the parallel resistor in area j;

[0025] When an open-circuit fault occurs in one partition k of the elevator safety circuit, one or more safety circuit switches in area k are disconnected, and other partitions are normal. The magnitude of the voltage measured by the voltmeter is:

[0026]

[0027] In the formula, R k represents the parallel resistance of the k area;

[0028] When an open - circuit fault occurs simultaneously in two partitions j and k of the elevator safety circuit, one or more safety - circuit switches in the j area and the k area are disconnected, and other partitions are normal. The magnitude of the voltage measured by the voltmeter is:

[0029]

[0030] If an open - circuit fault occurs simultaneously in more than three partitions of the elevator safety circuit, then by analogy according to the above calculation formula, the magnitude of the voltage measured by the voltmeter can be obtained.

[0031] Furthermore, in step S4, an ammeter is used for partition fault detection, ignoring the wire resistance and the internal resistance of the ammeter.

[0032] Furthermore, according to the magnitude of the current measured by the ammeter, the state of the safety circuit is detected, including:

[0033] If the partitions form areas j, k, n, …, in the normal working state of the elevator, all safety - circuit switches are in the closed state, and the magnitude of the current measured by the ammeter is:

[0034] I j = I k = I n = … = 0A

[0035] In the formula, I j represents the current of partition j; I k represents the current of partition k; I n represents the current of partition n;

[0036] When an open - circuit fault occurs in one partition j of the elevator safety circuit, one or more safety - circuit switches in the j area are disconnected, and other partitions are normal. The magnitude of the current measured by the ammeter is:

[0037]

[0038] I k = I n = … = 0A

[0039] In the formula, R j represents the parallel resistance of partition j;

[0040] When an open - circuit fault occurs in one partition k of the elevator safety circuit, one or more safety - circuit switches in the k area are disconnected, and other partitions are normal. The magnitude of the current measured by the ammeter is:

[0041]

[0042] I j = I n = … = 0A

[0043] Wherein, R k represents the parallel resistance of partition k;

[0044] When an open - circuit fault occurs simultaneously in two partitions j and k of the elevator safety circuit, one or more safety - circuit switches in partitions j and k are disconnected, and other partitions are normal. The magnitude of the current measured by the ammeter is:

[0045]

[0046] I n = … = 0A

[0047] Wherein, R n represents the parallel resistance of partition n;

[0048] If an open - circuit fault occurs simultaneously in more than three partitions of the elevator safety circuit, then by analogy according to the above - mentioned calculation formula, the magnitudes of the currents measured by each ammeter can be obtained.

[0049] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0050] The present invention has accurate fault location. By measuring the voltage value or current value of each partition with a voltmeter or an 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.

[0051] 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.

[0052] The present invention has the ability of real - time monitoring, can realize 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.

[0053] 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. Brief Description of the Drawings

[0054] Figure 1 It is a schematic flow chart of the elevator safety - circuit detection method based on switch partitioning.

[0055] Figure 2Schematic diagram of the elevator safety circuit detection circuit for Embodiment 1.

[0056] Figure 3 Schematic diagram of the elevator safety circuit detection circuit for Embodiment 3.

[0057] Figure 4 Schematic diagram of the elevator safety circuit detection circuit for Embodiment 4.

[0058] Figure 5 Schematic diagram of the elevator safety circuit detection circuit for Embodiment 5. Detailed implementation manner

[0059] The following further describes the elevator safety circuit detection method based on switch partitioning of the present invention in conjunction with the accompanying drawings and specific embodiments.

[0060] Please refer to Figure 1 , the present invention discloses an elevator safety circuit detection method based on switch partitioning, including the following steps:

[0061] S1: Partition the switches of the elevator safety circuit, and sequentially connect them in series into the circuit according to the partition order to determine the safety circuit voltage V T ;

[0062] S2: Parallel resistors at both ends of each partition in turn;

[0063] S3: Parallel the voltmeter at both ends of the safety circuit, or series the ammeter into each partition circuit;

[0064] S4: Determine the equivalent resistance R T of the safety circuit components, and detect the state of the safety circuit according to the magnitude V of the voltage measured by the voltmeter, or according to the magnitude of the current measured by the ammeter;

[0065] S5: Locate the partition where the fault occurs according to the magnitude V of the voltage measured by the voltmeter, or according to the magnitude of the current measured by the ammeter.

[0066] Embodiment 1

[0067] Please refer to Figure 2 , the elevator safety circuit detection method based on switch partitioning in this embodiment includes the following steps:

[0068] S1: Partition the switches of the elevator safety circuit according to the spatial position into the car top safety circuit switch area (Area A), the pit safety circuit switch area (Area B), and the car safety circuit switch area (Area C), and sequentially connect them in series into the circuit according to the partition order. The safety circuit uses 110VDC voltage;

[0069] S2: Parallel resistors at both ends of each partition in turn. The parallel resistor R in Area A A= 10 Ω, the parallel resistance R of area B B = 5 Ω, the parallel resistance R of area C C = 20 Ω;

[0070] S3: Connect the voltmeter in parallel across both ends of the safety circuit;

[0071] S4: Ignoring the wire resistance and the voltmeter internal resistance, the equivalent resistance R of the safety circuit components T = 30 Ω, and detect the state of the safety circuit according to the magnitude V of the voltage measured by the voltmeter as follows:

[0072] When the elevator is in normal working condition, all the switches in the safety circuit are in the closed state

[0073] V = 0 V;

[0074] When an open circuit fault occurs in area A of the elevator safety circuit, one or more safety circuit switches in area A are disconnected, and other partitions are normal. The magnitude of the voltage measured by the voltmeter is:

[0075]

[0076] When an open circuit fault occurs in area B of the elevator safety circuit, one or more safety circuit switches in area B are disconnected, and other partitions are normal. The magnitude of the voltage measured by the voltmeter is:

[0077]

[0078] When open circuit faults occur in both area A and area B of the elevator safety circuit, one or more safety circuit switches in area A and area B are disconnected, and other partitions are normal. The magnitude of the voltage measured by the voltmeter is:

[0079]

[0080] S5: Locate the partition where the fault occurs according to the magnitude of the voltage measured by the voltmeter.

[0081] Embodiment 2

[0082] On the basis of referring to Embodiment 1, in step S1, the switches of the elevator safety circuit are partitioned according to the function standard into a speed limit function switch area (area A), an extreme function switch area (area B), and a detection function switch area (area C), and are sequentially connected in series into the circuit according to the partition order. The safety circuit uses 110 VDC voltage; other steps refer to Embodiment 1.

[0083] Embodiment 3

[0084] Please refer to Figure 3 , on the basis of Embodiment 1, this embodiment improves the detection accuracy. The elevator safety circuit detection method based on switch partitioning in this embodiment includes the following steps:

[0085] S1: Divide the switches of the elevator safety circuit into zones according to the quantity standard. Each switch of the safety circuit is an independent zone, and they are successively connected in series into the circuit in the order of the zone sequence. The safety circuit uses 220 VDC voltage;

[0086] S2: Connect resistors in parallel at both ends of each zone in turn. The parallel resistor R1 in zone 1 = 10 Ω, the parallel resistor R2 in zone 2 = 5 Ω, the parallel resistor R3 in zone 3 = 20 Ω, the parallel resistor R4 in zone 4 = 25 Ω, the parallel resistor R5 in zone 5 = 30 Ω, the parallel resistor R6 in zone 6 = 35 Ω, the parallel resistor R7 in zone 7 = 40 Ω;

[0087] S3: Connect the voltmeter in parallel at both ends of the safety circuit;

[0088] S4: Ignoring the wire resistance and the internal resistance of the voltmeter, the equivalent resistance of the safety circuit components is R T = 30 Ω. Detect the state of the safety circuit according to the magnitude V of the voltage measured by the voltmeter as follows:

[0089] Under the normal working state of the elevator, each switch of the safety circuit is in the closed state, and the magnitude of the voltage measured by the voltmeter is:

[0090] V = 0 V;

[0091] An open - circuit fault occurs in switch 1 of the elevator safety circuit, and other zones are normal. The magnitude of the voltage measured by the voltmeter is:

[0092]

[0093] An open - circuit fault occurs in switch 2 of the elevator safety circuit, and other zones are normal. The magnitude of the voltage measured by the voltmeter is:

[0094]

[0095] And so on, to obtain the magnitude V of the voltage measured by the voltmeter when open - circuit faults occur in switches 3, 4, 5, 6, and 7 of the elevator safety circuit.

[0096] S5: Quickly locate the safety circuit switch with a fault according to the magnitude of the voltage measured by the voltmeter.

[0097] Embodiment 4

[0098] Based on Embodiment 1, this embodiment uses an ammeter for the detection of zone faults. The circuit diagram is as Figure 4 shown. Other functional principles are similar. The method for detecting the elevator safety circuit based on switch zoning in this embodiment includes the following steps:

[0099] S1: Divide the switches of the elevator safety circuit into zones according to their spatial positions, namely the car top safety circuit switch zone (Zone A), the pit safety circuit switch zone (Zone B), and the car safety circuit switch zone (Zone C), and connect them in series into the circuit in the order of the zones in turn. The safety circuit uses a 110VDC voltage;

[0100] S2: Connect resistors in parallel at both ends of each zone in turn. The parallel resistor R in Zone A A = 10Ω, the parallel resistor R in Zone B B = 5Ω, and the parallel resistor R in Zone C C = 20Ω;

[0101] S3: Connect the ammeter in series into each zone circuit;

[0102] S4: Ignoring the wire resistance and the ammeter internal resistance, the equivalent resistance of the safety circuit components is R T = 30Ω. According to the magnitudes of the currents I A 、I B 、I C measured by the ammeter, detect the status of the safety circuit as follows:

[0103] Under the normal operating state of the elevator, all the switches in the safety circuit are in the closed state, and the magnitudes of the currents measured by the ammeter are:

[0104] I A = I B = I C = 0A

[0105] When an open circuit fault occurs in Zone A of the elevator safety circuit, one or more safety circuit switches in Zone A are disconnected, and other zones are normal. The magnitudes of the currents measured by the ammeter are:

[0106]

[0107] I B = I C = 0A

[0108] When an open circuit fault occurs in Zone B of the elevator safety circuit, one or more safety circuit switches in Zone B are disconnected, and other zones are normal. The magnitudes of the currents measured by the ammeter are:

[0109]

[0110] I A = I C = 0A

[0111] When open circuit faults occur in both Zone A and Zone B of the elevator safety circuit, one or more safety circuit switches in Zone A and Zone B are disconnected, and other zones are normal. The magnitudes of the currents measured by the ammeter are:

[0112]

[0113] I C = 0A

[0114] S5: Locate the faulty section according to the current measured by the ammeter.

[0115] Embodiment 5

[0116] Based on Embodiment 4, the detection circuit of this embodiment can also adopt Figure 5 the form shown, with similar other functional principles, which can effectively reduce the use of ammeters.

[0117] In summary, the present invention has the following advantages and beneficial effects:

[0118] The fault location of the present invention is accurate. By measuring the voltage value or current value of each section with a voltmeter or an ammeter, the section 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.

[0119] 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.

[0120] The present invention has the ability of real-time monitoring, can realize the real-time monitoring of the elevator safety circuit, timely discover potential faults, and reduce the risk of accidents. Compared with periodic manual inspections, real-time monitoring can intervene in fault troubleshooting earlier.

[0121] The present invention enhances safety. Through accurate fault location and rapid response, the elevator can be maintained and repaired in time, thereby greatly improving the overall safety of the elevator and ensuring the life safety of passengers.

[0122] The above description is a detailed description of the preferred feasible embodiment of the present invention, but the embodiment is not used to limit the patent application scope of the present invention. Any equivalent changes or modified variations completed under the technical spirit disclosed by the present invention shall fall within the patent scope covered by the present invention.

Claims

1. A method for detecting an elevator safety circuit based on switch partitioning, characterized in that: The following steps are involved: S1: Divide the switches of the elevator safety circuit into zones and connect them in series in the order of zones to determine the safety circuit voltage V T ; S2: Connect resistors in parallel at both ends of each partition; S3: Connect the voltmeter in parallel to both ends of the safety circuit, or connect the ammeter in series to each partition circuit; S4: Determine the equivalent resistance R of the safety circuit components T , detect the state of the safety circuit according to the voltage V measured by the voltmeter, or according to the current measured by the ammeter; S5: Locate the fault zone based on the voltage V measured by the voltmeter or the current measured by the ammeter.

2. The elevator safety circuit detection method based on switch partitioning according to claim 1 is characterized in that: In step S1, the standards for zoning the safety circuit switches include one or more of function, space, quantity, and hazard level of the switches.

3. The elevator safety circuit detection method based on switch partitioning 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.

4. The elevator safety circuit detection method based on switch partitioning according to claim 1 is characterized in that: In step S2, the number of resistors connected in parallel is consistent with the number of partitions, and the resistance values ​​of the resistors are independent of each other.

5. The elevator safety circuit detection method based on switch partitioning according to claim 1 is characterized in that: In step S3, the voltage meter range is greater than the safety circuit voltage V T The voltmeter includes a DC voltmeter, an AC voltmeter, and an AC / DC voltmeter.

6. The elevator safety circuit detection method based on switch partitioning according to claim 1 is characterized in that: In step S3, the ammeter range is greater than the safety loop current, and the ammeter includes a DC ammeter, an AC ammeter, or an AC / DC ammeter.

7. The elevator safety circuit detection method based on switch partitioning according to claim 1 is characterized in that: In step S4, a voltmeter is used to perform partition fault detection, ignoring the wire resistance and the internal resistance of the voltmeter.

8. The elevator safety circuit detection method based on switch partitioning according to claim 7 is characterized in that: According to the voltage V measured by the voltmeter, the state of the safety circuit is detected, including: If the partitions are formed into zone j, zone k, zone n, ..., when the elevator is in normal working state, all switches of the safety circuit are in closed state, the voltage measured by the voltmeter is: V = 0V; 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 voltmeter is: In the formula, R j represents the parallel resistance of region j; 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 voltmeter is: In the formula, R k represents the parallel resistance of the k region; 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 voltmeter is: If open circuit faults occur in more than three zones of the elevator safety circuit, the voltage measured by the voltmeter can be obtained by analogy using the above calculation formula.

9. The elevator safety circuit detection method based on switch partitioning according to claim 1 is characterized in that: In step S4, an ammeter is used to perform partition fault detection, ignoring the wire resistance and the internal resistance of the ammeter.

10. The elevator safety circuit detection method based on switch partitioning according to claim 9 is characterized in that: According to the current measured by the ammeter, the state of the safety circuit is detected, including: If the partitions are formed into zone j, zone k, zone n, ..., when the elevator is in normal working state, all switches of the safety circuit are in closed state, the current measured by the ammeter is: IN j =I k =I n =…=0A In the formula, I j represents the current in partition j; I k represents the current in partition k; I n represents the current in partition n; 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 current measured by the ammeter is: IN k =I n =…=0A In the formula, R j represents the parallel resistance of partition j; 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 current measured by the ammeter is: IN j =I n =…=0A In the formula, R k represents the parallel resistance of partition k; 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 current measured by the ammeter is: IN n =…=0A In the formula, R n represents the parallel resistance of partition n; If open circuit faults occur in more than three zones of the elevator safety circuit, the current measured by each ammeter can be obtained by analogy using the above calculation formula.

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