Detection Method and Device for Star-Connected Contactor of Elevator

Abstract

The present invention discloses a detection method and device for a star - sealing contactor used in an elevator. The method includes: controlling the car to stop at the top - floor leveling position and opening the elevator brake device; starting timing when receiving the signal that the brake device is opened, and within a preset time, real - time monitoring the real - time speed or real - time acceleration of the traction machine when the elevator creeps upward; if the preset time is not reached and the real - time speed is greater than the preset speed or the real - time acceleration is greater than the preset acceleration, the elevator control system determines that the star - sealing contactor is in a non - effective state; if after reaching the preset time, the real - time speed is not greater than the preset speed or the real - time acceleration is not greater than the preset acceleration, it is determined that the star - sealing contactor is in an effective state. The present invention utilizes the buffer free travel between the counterweight and the buffer to make the no - load elevator creep upward to simulate the elevator creep under fault conditions, and determines whether the star - sealing contactor is in an effective state through speed or acceleration signals, avoiding the defect of using the conventional method of detecting the contact on - off to detect the star - sealing contactor.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator detection, and in particular to a method and a device for detecting a star-sealing contactor for an elevator. Background Art

[0002] As a tool for vertical transportation of people and goods, elevators have become an indispensable part of modern buildings, and elevator safety has received more and more attention. In order to ensure safety, modern elevators have very mature protection measures, and elevator star-sealing contactors are one of them.

[0003] At present, the devices used to protect the elevator from stalling on traction-driven passenger elevators include brake arms, safety clamps, and upward overspeed protection devices. Under normal circumstances, when the elevator stops running or loses power, the brake arm of the traction machine automatically locks the drive main unit mechanically. When the elevator exceeds the speed limiter when going down, the brake arm is first locked by the action of the speed limiter. If the speed continues to increase, the safety clamp is triggered to stop the elevator. When the elevator exceeds the speed limiter when going up, the brake arm is first locked by the action of the speed limiter. If the speed continues to increase, the upward overspeed protection device is triggered to stop the elevator. The upward overspeed protection device may be a two-way safety clamp, brake arm, or rope clamp. The above-mentioned devices for controlling the car stop and overspeed protection may have component failures. Once they fail, the elevator will have no safety protection device. At this time, the two ends of the suspension belt are respectively hung with a car for transporting people and a counterweight device for balancing the weight of the car. The weight of the counterweight is equal to the weight of the car itself plus the balance coefficient k multiplied by the rated load. According to the national standards of the elevator industry, the k value is 0.4-0.5, which means that there is a high probability that there is a difference in the weight at both ends of the suspension belt, which causes the elevator to accelerate toward the heavier side. When the car slips, the star-sealing contactor can make the elevator run at a very low speed, which is completely within the speed range that the elevator buffer can withstand. In summary, the star-sealing contactor is actually the last guarantee of elevator safety when the elevator stalls and the stall protection device fails.

[0004] like Figure 1 As shown, the star-sealing contactor has a set of normally open contacts and a set of normally closed contacts, and the two sets of contacts act simultaneously. The normally closed contacts are connected in parallel to the main circuit between the elevator control system and the traction machine. When the elevator control system outputs current, the main circuit is connected, the normally closed contacts are disconnected, and the current is supplied to the traction machine along the main circuit to control the rotation of the traction machine. At the same time, another set of normally open contacts on the star-sealing contactor is closed, and the 24V power supply is output to the elevator control system signal receiving port through the conversion of the internal components of the contactor. The elevator control system determines the action of the star-sealing contactor through the timing analysis of the output signal and the input signal. At present, the on-off state of the main contact is determined by detecting the auxiliary contacts through the elevator control system. However, there are the following defects:

[0005] 1. The signal receiving port of the elevator control system can detect the operating conditions of multiple types of contactors simultaneously, and the moving contacts of multiple contactors are in series. In this way, if one contactor (possibly the star - sealing contactor) is in a non - effective state, there is still signal input at the port.

[0006] 2. When the elevator control system only detects the star - sealing contactor, after the star - sealing contactor is damaged and not replaced due to various reasons, if the wiring is manually modified to connect the moving signals of other contactors to this detection port, then this monitoring point actually does not detect the operating condition of the star - sealing contactor.

[0007] 3. For the convenience of maintenance, the detection port is manually closed and cancelled.

[0008] In summary, by using the detection points reserved on the elevator control system to detect the operating state of the star - sealing contactor, there are cases of detection distortion, and it cannot truly reflect whether the star - sealing contactor operates normally and whether it is in an effective state. Summary of the Invention

[0009] To solve the above problems, the present invention provides a method for detecting a star - sealing contactor for an elevator, including:

[0010] The elevator control system controls the car to stop running and opens all the brake devices of the elevator;

[0011] After receiving the signal that the brake device is opened, the elevator control system starts timing and, within a preset time, continuously monitors the real - time speed V1 or real - time acceleration a1 of the traction machine when the elevator runs backward.

[0012] If the preset time is not reached and the real - time speed V1 exceeds the preset speed V2, or the real - time acceleration a1 exceeds the preset acceleration a2, then the elevator control system determines that the star - sealing contactor is in a non - effective state;

[0013] If, after reaching the preset time, the real - time speed V1 is less than or equal to the preset speed V2, or the real - time acceleration a1 is less than or equal to the preset acceleration a2, then it is determined that the star - sealing contactor is in an effective state.

[0014] Optionally, the method for setting the preset time is:

[0015] Calculate the backward running distance of the empty car when the star - sealing contactor is in a non - effective state;

[0016] By comparing the backward running distance of the empty car when the star - sealing contactor is in a non - effective state with the maximum empty stroke of the elevator buffer, make the backward running distance of the empty car when the star - sealing contactor is in a non - effective state less than the maximum empty stroke of the buffer, so as to determine the maximum preset time.

[0017] By making the backward running distance of the empty car when the star - sealing contactor is in a non - effective state greater than the minimum backward running threshold, determine the minimum preset time.

[0018] The preset time is within the range of the minimum preset time and the maximum preset time.

[0019] Optionally, according to the average car creep speed values when the star connection contactor of the empty car with various rated loads is in the effective state, the average car creep speed values when the star connection contactor of the empty car with various rated loads is in the non-effective state, and the minimum creep speed value, the preset speed is determined, so that the preset speed value is greater than the average car creep speed values when the star connection contactor of the empty car with various rated loads is in the effective state at the maximum preset time, less than the minimum creep speed value when the star connection contactor of the empty car with various rated loads is in the non-effective state at the minimum preset time, and should be at least twice the average car creep speed values when the star connection contactor of the empty car with various rated loads is in the effective state at the maximum preset time.

[0020] Optionally, the real-time speed or real-time acceleration of the traction machine rotation is determined by monitoring the signal fed back by the encoder.

[0021] Optionally, before the elevator control system controls the car to stop running and opens all the brake devices of the elevator, the elevator control system first confirms that there are no people using the car and then drives the elevator to the top floor leveling position.

[0022] Optionally, if it is determined that the star connection contactor is in the non-effective state, the elevator control system controls all the brake devices to brake. If it is determined that the star connection contactor is in the effective state, the elevator control system switches the elevator to the running mode.

[0023] Optionally, the method for measuring the car creep speed value when the star connection contactor of the empty car with any rated load is in the effective state is as follows:

[0024] Measure multiple groups of car creep speed values and car creep distance values, remove the maximum value and the minimum value, and calculate the average value of the remaining data to obtain the car creep speed value and car creep distance when the star connection contactor is in the effective state.

[0025] Optionally, the method for calculating the car creep speed value and car creep distance when the star connection contactor of the empty car with any rated load is in the non-effective state includes:

[0026] (1) Calculate the acceleration a = F / m,

[0027] where F = Mc * g,

[0028] Mc = Cwt - P

[0029] m = Cwt + P,

[0030] Cwt is the counterweight weight;

[0031] P is the car self-weight;

[0032] g is the acceleration due to gravity,

[0033] Mc is the system quality difference;

[0034] (2) Calculate the vehicle rolling speed V = a * t

[0035] Calculate the vehicle rolling distance S = at 2 / 2

[0036] t is the preset time.

[0037] Optionally, determine the preset acceleration according to the average vehicle rolling acceleration value when the star - closing contactor of the no - load car with multiple rated loads is in the effective state, the average vehicle rolling acceleration value when the star - closing contactor of the no - load car with multiple rated loads is in the non - effective state, and the minimum vehicle rolling acceleration value.

[0038] Make the preset acceleration greater than the average vehicle rolling acceleration value when the star - closing contactor of the no - load car with multiple rated loads is in the effective state under the maximum preset time, less than the minimum vehicle rolling acceleration value when the star - closing contactor of the no - load car with multiple rated loads is in the non - effective state under the minimum preset time, and at least twice the average vehicle rolling acceleration value when the star - closing contactor of the no - load car with multiple rated loads is in the effective state under the maximum preset time.

[0039] The present invention also provides an electronic device, including a memory and at least one processor. At least one instruction is stored in the memory, and when the at least one instruction is executed by the at least one processor, the elevator star - closing contactor detection method as described above is implemented.

[0040] The elevator star - closing contactor detection method of the present invention has the following beneficial effects: The detection method of the present invention can directly perform detection without adding any hardware. By using the fact that there is a certain buffer empty stroke between the bottom of the counterweight side and the buffer, the elevator is driven to the top floor leveling, and the vehicle is rolled upward to simulate the vehicle rolling in the case of elevator power failure and brake failure. The star - closing contactor is judged to be qualified through the speed (or acceleration) signal fed back by the encoder, effectively avoiding problems such as ineffective detection or complicated detection process in common detection methods, and is simple and easy to implement; moreover, by rolling the vehicle upward from the top floor leveling, it can also avoid the risks of over - running to the top and bottoming out caused by excessive vehicle rolling speed (acceleration) due to the failure of the star - closing contactor. Brief Description of the Drawings

[0041] By describing its embodiments in combination with the following drawings, the above - mentioned features and technical advantages of the present invention will become clearer and easier to understand.

[0042] Figure 1 It is a schematic diagram showing the detection of the elevator star - closing contactor in the prior art;

[0043] Figure 2It is a schematic diagram showing the use of the buffer free travel coasting in the embodiments of the present invention;

[0044] Figure 3 It is a flowchart showing the method for detecting the star - sealing contactor for an elevator in the embodiments of the present invention. Detailed implementation manners

[0045] The embodiments of the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art can recognize that, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways or in combinations thereof. Therefore, the drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims. In addition, in this specification, the drawings are not drawn to scale, and the same reference numerals represent the same parts.

[0046] As Figure 2 shown, the counterweight 20 and the car 10 are respectively at both ends of the guide wheel 40, and below the counterweight 20 is the buffer 30. According to the regulations of the national standard in the elevator industry, when the elevator is leveled at the top floor, there is a certain buffer free travel between the bottom of the counterweight side and the buffer 30. Because, even if the acceleration is too fast in this area, there is the buffer below for protection. In this embodiment, when the car 10 coasts upward in this space, whether it exceeds the set speed value is used to determine whether the star - sealing contactor is qualified. The coasting refers to that due to the opening of all brake devices and the gravity difference at both ends of the elevator, under the action of gravity, the elevator accelerates towards the heavier side.

[0047] The method for detecting the star - sealing contactor for an elevator in this embodiment includes:

[0048] Step S1, the elevator control system controls the car to stop running and opens all the brake devices of the elevator;

[0049] Step S2, after receiving the signal that the brake device is opened, the elevator control system starts timing and real - time monitors the real - time speed V1 or real - time acceleration a1 of the traction machine within a preset time. Among them, the real - time speed V1 or real - time acceleration a1 of the traction machine can be determined by monitoring the signal fed back by the encoder.

[0050] Step S3, if within the preset time, the real - time speed V1 has exceeded the preset speed V2 or the real - time acceleration a1 has exceeded the preset acceleration a2, then the elevator control system determines that the star - sealing contactor is in a non - effective state, directly controls all the brake devices to brake. The elevator reports a fault, and this fault must be restored by a maintenance personnel on - site. After restoration, the control system automatically conducts the detection again, and can switch to the normal operation mode only after the detection is qualified.

[0051] If, after reaching the preset time, the real-time speed V1 detected by the elevator control system is less than or equal to the system preset speed V2 or the real-time acceleration a1 is less than or equal to the preset acceleration a2, it is determined that the star contactor is in an effective state, and the elevator automatically switches to the normal operation mode.

[0052] Among them, the above-mentioned preset time, preset speed, and preset acceleration are pre-set in the elevator control system and are adjustable. The following explains how to determine these parameters.

[0053] Step a, measure the coasting speed and coasting distance of the empty car when the star contactor is in an effective state;

[0054] Specifically, stop the empty car at the top floor leveling position, open the brake device, let the elevator coast upwards, measure the coasting speed values and coasting distance values of the empty car with different rated loads, remove the maximum and minimum values, and calculate the average values of the remaining data respectively. Table 1 shows the coasting data of the empty car with different rated loads measured at a running time of 0.4 s, including the coasting speed values corresponding to the empty cars with rated loads of 400 kg, 1000 kg, and 1600 kg.

[0055] Table 1 (running for 0.4 s)

[0056] Rated load 400 kg 1000 1600 kg Speed 0.0433 0.0456 0.0462

[0057] Step b, calculate the coasting speed and coasting distance of the empty car when the star contactor is in a non-effective state;

[0058] Among them, the parameters involved are the car self-weight P, the rated load Q, the counterweight weight Cwt = P + 0.5Q, the system mass difference Mc = Cwt - P, the total mass of the empty car system Mt = Cwt + P, F = system mass difference * gravitational acceleration, m = total mass of the empty car system Mt, a = F / m, coasting distance S = at 2 / 2,

[0059] For example, according to the data, calculate the data of the empty car with a rated load of 400 kg at a coasting time of 0.1 S as follows:

[0060] Car self-weight P = 400

[0061] Rated load Q = 400

[0062] Counterweight weight Cwt = P + kQ = 600

[0063] System mass difference Mc = Cwt - P = 200

[0064] Total mass of the empty car system Mt = 1000

[0065] Balance coefficient k = 0.5

[0066] It is calculated that a = F / m = 1.96 m / s 2

[0067] t = 0.1 s

[0068] V = a * t = 0.2 m / s

[0069] S = 9.8 mm.

[0070] For example, according to the data, the data when the empty car with a rated load of 400 kg has a run - away time of 0.4 s are as follows:

[0071] The self - weight of the car P = 400

[0072] The rated load Q = 400

[0073] The counterweight weight Cwt = P + kQ = 600

[0074] The system mass difference Mc = Cwt - P = 200

[0075] The total mass of the empty - car system Mt = 1000

[0076] The balance coefficient k = 0.5

[0077] It is calculated that a = F / m = 1.96 m / s 2

[0078] t = 0.4 s

[0079] V = a * t = 0.78 m / s

[0080] S = 156.8 mm.

[0081] For example, for an empty car with a rated load of 1000 kg and a run - away time of 0.1 s:

[0082] The self - weight of the car P = 1100

[0083] The rated load Q = 1000

[0084] The counterweight weight Cwt = P + kQ = 1600

[0085] The system mass difference Mc = Cwt - P = 500

[0086] The total mass of the empty - car system Mt = 2700

[0087] The balance coefficient k = 0.5

[0088] It is calculated that a = F / m = 1.815 m / s 2

[0089] t = 0.1 s

[0090] V = a * t = 0.18 m / s

[0091] S = 9.074 mm。

[0092] For example, for an empty car with a rated load of 1000 kg and a run - away time of 0.4 s:

[0093] The self - weight of the car P = 1100

[0094] The rated load Q = 1000

[0095] The counterweight Cwt = P + kQ = 1600

[0096] The system mass difference Mc = Cwt - P = 500

[0097] The total mass of the empty - car system Mt = 2700

[0098] The balance coefficient k = 0.5

[0099] Calculated a = F / m = 1.815 m / s 2

[0100] t = 0.4 s

[0101] V = a * t = 0.73 m / s

[0102] S = 145.2 mm。

[0103] For example, for an empty car with a rated load of 1600 kg and a run - away time of 0.1 s:

[0104] The self - weight of the car P = 1800

[0105] The rated load Q = 1600

[0106] The counterweight Cwt = P + kQ = 2600

[0107] The system mass difference Mc = Cwt - P = 800

[0108] The total mass of the empty - car system Mt = 4400

[0109] The balance coefficient k = 0.5

[0110] Calculated a = F / m = 1.782 m / s 2

[0111] t = 0.1 s

[0112] V = a * t = 0.18 m / s

[0113] S = 8.909 mm。

[0114] For example, for an empty car with a rated load of 1600 kg and a car run-away time of 0.4 s:

[0115] The self-weight of the car P = 1800

[0116] The rated load Q = 1600

[0117] The counterweight Cwt = P + kQ = 2600

[0118] The system mass difference Mc = Cwt - P = 800

[0119] The total mass of the empty car system Mt = 4400

[0120] The balance coefficient k = 0.5

[0121] It is calculated that a = F / m = 1.782 m / s 2

[0122] t = 0.4 s

[0123] V = a * t = 0.71 m / s S = 142.5 mm.

[0124] Step c: By comparing the car run-away distance in the ineffective state of the star connection contactor with the maximum free travel of the buffer (for elevators with elevator speed ≤ 1.75 m / s), make the car run-away distance in the ineffective state of the star connection contactor less than the maximum free travel of the buffer, so as to determine the maximum preset time, and select the minimum time based on ensuring data validity.

[0125] For example, when the time is 0.4 s and the star connection contactor is in the ineffective state, for an empty car with a rated load of 400 kg and a car self-weight of 400 kg, the theoretical car run-away distance of the elevator is 156.8 mm. This value is very close to the maximum free travel of the buffer used in ordinary elevators (speed ≤ 1.75 m / s). The greater the speed, the greater the free travel of the buffer and the longer the time available for testing. However, in order to ensure the generality of the data and to minimize the situation of hitting the buffer during testing, the maximum test time should not be greater than 0.4 s. When the time is 0.1 s and the star connection contactor is in the ineffective state, for an empty car with a rated load of 1600 kg and a car self-weight of 1800 kg, the theoretical car run-away distance of the elevator is 8.909 mm. This value is already very small. In order to ensure the validity of the data, the time should not be less than 0.1 s. That is to say, the car run-away distance in the ineffective state of the star connection contactor should be greater than a certain run-away threshold value so that the data is larger and can truly reflect the speed data of the car.

[0126] Step d: Determine the preset speed based on the average car creep speed values when the star connection contactor is in the effective state for various rated loads of the empty car, the average car creep speed values when the star connection contactor is in the non-effective state for various rated loads of the empty car, and the minimum creep speed value. For example, from the above data, it can be seen that after 0.4 s of car creep, when the star connection contactor is in the effective state, the average car creep speed for various rated loads of the empty car is (0.0433 + 0.0456 + 0.0462) / 3 = 0.045, which is only below 0.05 m / s. When the star connection contactor is in the non-effective state, the average car creep speed value for various rated loads of the empty car is (0.78 + 0.73 + 0.71) / 3 = 0.74, which is 16.4 times that of the effective state of the star connection contactor at the same time.

[0127] Furthermore, when the car creep time is 0.1 s and the star connection contactor is in the non-effective state, the minimum speed is 0.18 m / s. This speed value is 3.89 times that of the speed value when the car creep time is 0.4 s and the star connection contactor is in the effective state. Therefore, the preset speed can be set to 0.1 m / s. That is to say, the preset speed value should be greater than the average car creep speed value when the star connection contactor is in the effective state for various rated loads of the empty car at the maximum preset time point, and should be at least 2 times the average car creep speed value when the star connection contactor is in the effective state for various rated loads of the empty car; it should be less than the minimum car creep speed value when the star connection contactor is in the non-effective state for various rated loads of the empty car at the minimum preset time point. This can not only ensure the test accuracy (when the test time is 0.1 s, the minimum speed when the star connection contactor does not work is 0.18 m / s, which is much greater than the speed of the elevator at 0.4 s when the star connection contactor works, 0.0462 m / s), but also ensure safety.

[0128] Furthermore, because there is a certain suddenness in the car creep test, the test should be carried out when there is no one in the car. According to the regulations of the national standard of the elevator industry, the traction drive passenger elevator moves up and down by hanging a belt wound around the traction wheel of the drive host. There is a counterweight on the other side of the belt, and the weight of the counterweight is equal to the weight of the car itself plus the balance coefficient k multiplied by the rated load. According to the regulations of the national standard of the elevator industry, the value of k is 0.4 - 0.5. Therefore, when the car is empty, the weight on the car side is light, and the difference should be 40% - 50% of the rated load of the car. Once the car creeps, the car will move upward. Therefore, before step S1, step S0 should also be included:

[0129] After the elevator control system confirms that there is no one in the car, it automatically opens the door, accompanied by a 30 s prompt tone, then automatically closes the door after the end, does not respond to external call signals, and then drives the elevator to the top floor leveling position. The confirmation that there is no one in the car can be achieved through one or a combination of the following methods, but not limited to: 1) No external call or internal selection signal within 3 minutes; 2) The car weighing device feedbacks that there is no one in the car; 3) Face recognition by the camera in the car.

[0130] Use the upward creep of the car to detect the star contactor.

[0131] In the detection method of the elevator star contactor of the present invention, before the steps S0 and S1, there is also a step S00: the control system receives a detection trigger signal and enters step S0, and the detection trigger signal is a detection instruction input externally or a detection instruction sent internally after the time reaches a preset time.

[0132] The present invention also provides an electronic device. In this embodiment, the detection method of the elevator star contactor can be applied to the electronic device to determine the real-time speed / real-time acceleration of the detection. Specifically, for an electronic device that needs to detect the elevator star contactor, the function for detecting the elevator star contactor provided by the method of the present application can be directly integrated on the electronic device, or run on the electronic device in the form of a software development kit.

[0133] The hardware device architecture for implementing the detection method of the elevator star contactor is described below. The electronic device includes a memory and at least one processor. The memory is used to store program codes and various data, such as the detection program of the elevator star contactor installed in the electronic device, etc., and realizes the high-speed and automatic access of programs or data during the operation of the electronic device. The memory includes read-only memory, programmable read-only memory, erasable programmable read-only memory, one-time programmable read-only memory, electronically erasable and rewritable read-only memory, read-only optical disc or other optical disc memories, magnetic disk memories, magnetic tape memories, or any other computer-readable storage medium that can be used to carry or store data.

[0134] The at least one processor can be composed of integrated circuits. For example, it can be composed of a single packaged integrated circuit, or can be composed of multiple integrated circuits with the same or different functions packaged, including a combination of one or more central processors, microprocessors, digital processing chips, graphics processors, and various control chips, etc. The at least one processor is the control core of the electronic device, connects various components of the entire electronic device through various interfaces and lines, and executes various functions of the electronic device and processes data by running or executing programs or modules stored in the memory, and calling data stored in the memory, such as executing the function of detecting the elevator star contactor.

[0135] The detection method of the elevator star - sealing contactor can be divided into multiple functional modules composed of program code segments. Each functional module corresponds to different program codes for the division of the above - mentioned detection method of the elevator star - sealing contactor. The program codes of each program segment can be stored in a memory and executed by at least one processor to implement the detection method of the elevator star - sealing contactor.

[0136] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A detection method for a star contactor used in an elevator, characterized in that Comprising: The elevator control system controls the car to stop running and opens all the brake devices of the elevator; After receiving the signal that the brake device is opened, the elevator control system starts timing and, within a preset time, monitors in real time the real-time speed V1 or real-time acceleration a1 of the traction machine when the elevator runs backward upward; If the preset time is not reached, the real-time speed V1 exceeds the preset speed V2, or the real-time acceleration a1 exceeds the preset acceleration a2, then the elevator control system determines that the star connection contactor is in a non-effective state; If, after reaching the preset time, the real-time speed V1 is less than or equal to the preset speed V2, or the real-time acceleration a1 is less than or equal to the preset acceleration a2, then it is determined that the star connection contactor is in an effective state. The setting method of the preset time is as follows: Calculate the running-backward distance of the empty car when the star connection contactor is in a non-effective state; By comparing the running-backward distance of the empty car when the star connection contactor is in a non-effective state with the maximum empty stroke of the elevator buffer, make the running-backward distance of the empty car when the star connection contactor is in a non-effective state less than the maximum empty stroke of the buffer, so as to determine the maximum preset time. By making the running-backward distance of the empty car when the star connection contactor is in a non-effective state greater than the minimum running-backward threshold value, determine the minimum preset time. The preset time is within the range of the minimum preset time and the maximum preset time.

2. The method for detecting the star connection contactor for an elevator according to claim 1, wherein According to the average running-backward speed values of the empty cars with various rated loads when the star connection contactor is in an effective state, as well as the average running-backward speed values and the minimum running-backward speed values of the empty cars with various rated loads when the star connection contactor is in a non-effective state, determine the preset speed, so that the preset speed value is greater than the average running-backward speed values of the empty cars with various rated loads when the star connection contactor is in an effective state under the maximum preset time, less than the minimum running-backward speed values of the empty cars with various rated loads when the star connection contactor is in a non-effective state under the minimum preset time, and at least twice the average running-backward speed values of the empty cars with various rated loads when the star connection contactor is in an effective state under the maximum preset time.

3. The elevator star contactor detection method according to claim 1, characterized in that, Determine the real-time speed or real-time acceleration of the traction machine by monitoring the signal fed back by the encoder.

4. The method for detecting the star connection contactor for an elevator according to claim 1, characterized in that Before the elevator control system controls the car to stop running and opens all the brake devices of the elevator, the elevator control system first confirms that there is no one using the elevator in the car and then drives the elevator to the top floor leveling position.

5. The elevator star contactor detection method according to claim 1, characterized in that, If it is determined that the star connection contactor is in a non-effective state, the elevator control system controls all the brake devices to brake. If it is determined that the star connection contactor is in an effective state, the elevator control system switches the elevator to the running mode.

6. The elevator star contactor detection method according to claim 2, characterized in that, The measuring method of the running-backward speed value of the empty car with any rated load when the star connection contactor is in an effective state is as follows: Measure multiple groups of running-backward speed values and running-backward distance values, remove the maximum value and the minimum value, and calculate the average values of the remaining data respectively to obtain the running-backward speed value and running-backward distance when the star connection contactor is in an effective state.

7. The elevator star contactor detection method according to claim 2, characterized in that The method for calculating the running-backward speed value and running-backward distance of the empty car with any rated load when the star connection contactor is in a non-effective state includes: (1) Calculate the acceleration a = F / m, where F = Mc * g, Mc = Cwt - P m = Cwt + P, Cwt is the counterweight weight; P is the car self-weight; g is the gravitational acceleration, Mc is the system mass difference; (2) Calculate the coasting speed V = a * t Calculate the coasting distance S = at 2 / 2 t is the preset time.

8. The elevator star contactor detection method according to claim 1, characterized in that Determine the preset acceleration according to the average coasting acceleration values when the star contactor of the empty car with multiple rated loads is in the effective state, the average coasting acceleration values when the star contactor of the empty car with multiple rated loads is in the non-effective state, and the minimum coasting acceleration value Make the preset acceleration greater than the average coasting acceleration value when the star contactor of the empty car with multiple rated loads is in the effective state under the maximum preset time, less than the minimum coasting acceleration value when the star contactor of the empty car with multiple rated loads is in the non-effective state under the minimum preset time, and at least twice the average coasting acceleration value when the star contactor of the empty car with multiple rated loads is in the effective state under the maximum preset time.

9. An electronic device, characterized in that, It includes a memory and at least one processor. At least one instruction is stored in the memory, and when the at least one instruction is executed by the at least one processor, the elevator star contactor detection method according to any one of claims 1 to 8 is implemented.

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