CN114415007A

CN114415007A - Detection method and device for star-sealed contactor for elevator

Info

Publication number: CN114415007A
Application number: CN202111637507.4A
Authority: CN
Inventors: 刘健; 房祥雨; 王博驰; 王剑锋; 关洪泽; 滕阳; 孙成雨
Original assignee: Shenyang Yuanda Intellectual Industry Group Co ltd
Current assignee: Shenyang Yuanda Intellectual Industry Group Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-29

Abstract

The invention discloses a method and a device for detecting a star-sealed contactor for an elevator, wherein the method comprises the following steps: controlling the lift car to stop at the top flat floor and opening the elevator brake device; timing while receiving a brake device opening signal, and monitoring the real-time speed or real-time acceleration of the rotation of a traction machine when an elevator slides upwards in real time within a preset time; if the real-time speed is not longer than the preset speed or the real-time acceleration is larger than the preset acceleration, the elevator control system judges that the satellite-sealing contactor is in a non-effective state; and if the real-time speed is not greater than the preset speed or the real-time acceleration is not greater than the preset acceleration after the preset time is reached, judging the effective state of the satellite sealing contactor. The invention utilizes the buffer idle stroke between the counterweight and the buffer to ensure that the no-load elevator slides upwards to simulate the sliding of the elevator under the condition of fault, judges whether the satellite-sealing contactor is in an effective state or not through a speed or acceleration signal, and avoids the defect of detecting the satellite-sealing contactor by adopting a conventional contact on-off detection mode.

Description

Detection method and device for star-sealed contactor for elevator

Technical Field

The invention relates to the technical field of elevator detection, in particular to a method and a device for detecting a star-sealed contactor for an elevator.

Background

Elevators as a means of vertical transport for people and goods have become an essential part of the building construction today, and elevator safety is gaining more and more attention. In order to ensure safety. Modern elevators have been provided with sophisticated protective measures, of which the elevator star contact is one.

The devices currently used on traction drive passenger elevators to protect the elevator from stalling are brake arms, safety tongs and an up-run overspeed protection device. Normally, when the elevator stops running or loses power, a brake arm of a traction machine automatically locks a driving main machine by a mechanical mode. When the elevator goes down and exceeds the speed, the brake arm is locked by the action of the speed limiter, and if the speed continues to increase, the safety tongs are triggered to act to stop the elevator. When the elevator goes upwards and exceeds the speed, the brake arm is locked by the action of the speed limiter, and if the speed continues to increase, the elevator stops running by triggering the action of an upward overspeed protection device, wherein the upward overspeed protection device can be one of a bidirectional safety tongs, a brake arm or a rope clamp. Several of the above-mentioned devices controlling car stopping and overspeed protection have a component failure, and in case of failure the elevator has no safety protection device. At this time, a car for transporting people and a counterweight device for balancing the weight of the car are respectively suspended at two ends of the suspension belt, the weight of the counterweight is equal to the self weight of the car plus a balance coefficient k multiplied by a rated load capacity, and the k value is 0.4-0.5 according to the regulation of national standards of the elevator industry, namely, the weights at two ends of the suspension belt are very likely to have difference, which causes the elevator to move towards the heavy side in an accelerated way. The star contact allows the elevator to run at a very low speed, well within the speed range that can be tolerated by the elevator buffer, when a car-rolling event occurs. In conclusion, the star-sealing contactor is the final guarantee for the safety of the elevator when the elevator stalls and the stall protection device fails.

As shown in fig. 1, the star contact has a group of normally open contacts and a group of normally closed contacts, and the two groups of contacts act simultaneously. The normally closed contact is connected in parallel with a 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 contact is disconnected, and the current is supplied to the traction machine along the main circuit to control the rotation of the traction machine. Meanwhile, the other group of normally open contacts on the satellite sealing contactor is closed, a 24V power supply is output to a signal receiving port of an elevator control system through conversion of internal components of the contactor, and the elevator control system judges the action condition of the satellite sealing contactor through time sequence analysis of output signals and input signals. At present, the on-off state of a main contact is judged by detecting an auxiliary contact through an elevator control system. But has several disadvantages:

1. the signal receiving port of the elevator control system can simultaneously detect the working conditions of a plurality of types of contactors, and the action contacts of the contactors are in a series connection state, so that if one contactor (possibly a star-shaped contactor) is in an invalid state, the signal input of the port is still carried out.

2. When the elevator control system only detects the star-sealing contactor, the star-sealing contactor is not replaced due to various reasons after being damaged. And manually changing a circuit, and accessing action signals of other contactors into the detection port, wherein the monitoring point does not actually detect the action condition of the satellite-sealed contactor.

3. In order to be convenient for maintenance, the detection port is cancelled by manual closing.

In conclusion, the action state of the satellite sealing contactor is detected through the detection points reserved on the elevator control system, and the situation of detection distortion exists, so that whether the satellite sealing contactor normally acts or is in an effective state cannot be truly reflected.

Disclosure of Invention

In order to solve the problems, the invention provides a method for detecting a star-sealed contactor for an elevator, which comprises the following steps:

the elevator control system controls the car to stop running and enables all the internal contracting brake devices of the elevator to be opened;

the elevator control system starts timing after receiving a brake device opening signal, and monitors the real-time speed V1 or the real-time acceleration a1 of the rotation of the tractor when the elevator slides upwards in real time within a preset time;

if the real-time speed V1 exceeds the preset speed V2 or the real-time acceleration a1 exceeds the preset acceleration a2 without reaching the preset time, the elevator control system judges that the satellite-sealing contactor is in a non-effective state;

and if 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 after the preset time is reached, judging that the satellite sealing contactor is in an effective state.

Optionally, the preset time setting method includes:

calculating the sliding distance of the empty car in the non-effective state of the star-sealing contactor;

the sliding distance of the satellite-sealed contactor in the non-effective state is compared with the maximum idle stroke of the elevator buffer, so that the sliding distance of the satellite-sealed contactor in the non-effective state is smaller than the maximum idle stroke of the buffer, thereby determining the maximum preset time,

the minimum preset time is determined by the fact that the sliding distance of the satellite sealing contactor in the non-effective state is larger than the minimum sliding threshold value,

the preset time is within the range of the minimum preset time and the maximum preset time.

Optionally, the preset speed is determined according to the average sliding speed value when the star-sealed contactor of the empty car with various rated loads is in an effective state, and the average sliding speed value and the minimum sliding speed value when the star-sealed contactor of the empty car with various rated loads is in an ineffective state, so that the preset speed value is larger than the average sliding speed value when the star-sealed contactor of the empty car with various rated loads is in an effective state at the maximum preset time, is smaller than the minimum sliding speed value when the star-sealed contactor of the empty car with various rated loads is in an ineffective state at the minimum preset time, and is at least 2 times of the average sliding speed value when the star-sealed contactor of the empty car with various rated loads is in an effective state at the maximum preset time.

Alternatively, the real-time speed or real-time acceleration of the machine rotation is determined by monitoring the signals fed back by the encoders.

Optionally, before the elevator control system controls the car to stop running and enables all the internal contracting brake devices of the elevator to be opened, the elevator control system firstly confirms that no person in the car uses the elevator and then opens the elevator to the top floor leveling position.

Optionally, if the satellite-sealing contactor is judged to be in a non-effective state, the elevator control system controls all the band-type brakes of the band-type brake devices, and if the satellite-sealing contactor is judged to be in an effective state, the elevator control system switches the elevator to a running mode.

Optionally, the method for measuring the speed value of the rolling car in the effective state of the star contact of the unloaded car with any rated load comprises the following steps:

and measuring a plurality of groups of rolling speed values and rolling distance values, removing the maximum value and the minimum value, and respectively averaging the rest data to obtain the rolling speed values and the rolling distance in the effective state of the satellite sealing contactor.

Optionally, the method for calculating the vehicle sliding speed value and the vehicle sliding distance of the empty car with any rated load when the star-closing contact device is not in an effective state comprises the following steps:

(1) the acceleration a is calculated to be F/m,

wherein F is Mc g,

Mc＝Cwt-P

m＝Cwt+P，

cwt is the weight of the counterweight;

p is the car weight;

g is the acceleration of the gravity and,

mc is poor system quality;

(2) calculating the speed V ═ a × t of the vehicle

Calculating the sliding distance S ═ at²/2

t is a preset time.

Optionally, the preset acceleration is determined according to the average rolling acceleration value of the idle cage with various rated loads in the effective state of the star contact device and the average rolling acceleration value and the minimum rolling acceleration value of the idle cage with various rated loads in the non-effective state of the star contact device,

the preset acceleration is made to be larger than the average rolling acceleration value when the star-sealed contactors of the idle-load cars with various rated loads are in an effective state at the maximum preset time, and smaller than the minimum rolling acceleration value when the star-sealed contactors of the idle-load cars with various rated loads are in a non-effective state at the minimum preset time, and at least 2 times of the average rolling acceleration value when the star-sealed contactors of the idle-load cars with various rated loads are in an effective state at the maximum preset time.

The invention also provides an electronic device, which comprises a memory and at least one processor, wherein at least one instruction is stored in the memory, and the at least one instruction is executed by the at least one processor to realize the star contact detection method for the elevator.

The detection method of the elevator star-sealed contactor has the following beneficial effects: the detection method can directly carry out detection without adding any hardware, utilizes the fact that a certain buffer idle stroke exists between the bottom of the heavy side and the buffer, simulates the car sliding under the conditions of power loss of the elevator and failure of the brake by driving the elevator to a top flat layer and sliding upwards, judges whether the star-sealing contactor is qualified or not through a speed (or acceleration) signal fed back by the encoder, effectively avoids the problems that the detection cannot be effectively carried out or the detection process is complicated in the process of a common detection method, and is simple and easy to implement; and the top layer flat layer upward sliding is utilized, so that the risk of top rushing and bottom squating caused by overlarge sliding speed (acceleration) due to failure of the satellite sealing contact device can be avoided.

Drawings

The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram illustrating the detection of a prior art elevator star contact;

FIG. 2 is a schematic view showing a free-wheeling vehicle using a buffer according to an embodiment of the present invention;

fig. 3 is a flowchart showing a method for detecting a star contact for an elevator according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

As shown in fig. 2, the counterweight 20 and the car 10 are buffers 30 at both ends of the guide sheave 40 and below the counterweight 20, respectively. According to the regulations of the national standards of the elevator industry, when the elevator is on the top floor, there is a certain buffer clearance between the bottom of the counterweight side and the buffer 30, because even if the acceleration in this area is too fast, there is a buffer below to protect. In the embodiment, whether the star-closing contactor is qualified or not is judged by using whether the set speed value is exceeded or not when the space car 10 slides upwards. The car slipping means that the elevator accelerates to one heavy side under the action of gravity because gravity difference exists at two ends of the elevator due to the fact that all the brake devices are opened.

The detection method of the star-sealing contactor for the elevator comprises the following steps:

step S1, the elevator control system controls the car to stop running and enables all the brake devices of the elevator to be opened;

and step S2, the elevator control system starts timing after receiving the brake device opening signal, and monitors the real-time speed V1 or the real-time acceleration a1 of the rotation of the tractor in real time within a preset time, wherein the real-time speed V1 or the real-time acceleration a1 of the rotation of the tractor can be determined by monitoring a signal fed back by the encoder.

And step S3, if the real-time speed V1 does not reach the preset time and exceeds the preset speed V2 or the real-time acceleration a1 exceeds the preset acceleration a2, the elevator control system judges that the satellite-sealing contactor is in a non-effective state and directly controls the brake of all the brake devices. And reporting the fault by the elevator, wherein the fault needs to be recovered by maintenance personnel on site, the control system automatically detects again after recovery, and can switch to a normal operation mode after detection is qualified.

If the preset time is up, 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, the star-sealed contactor is judged to be in an effective state, and the elevator is automatically switched to a normal running mode.

The parameters of the preset time, the preset speed and the preset acceleration are preset in the elevator control system and are adjustable. The following describes how these several parameters are determined.

Step a, measuring the sliding speed and the sliding distance of the unloaded lift car in the effective state of the star-sealing contactor;

specifically, the no-load car is stopped at the top flat floor position, the band-type brake device is opened to enable the elevator to slide upwards, the sliding speed value and the sliding distance value of the no-load car with different rated load capacities are measured, the maximum value and the minimum value are removed, and the rest data are respectively averaged. Table 1 shows the rolling data of the empty cars with different rated loads measured at the running time of 0.4s, including the rolling speed values corresponding to the empty cars with the rated loads of 400kg, 1000kg and 1600 kg.

Table 1 (run 0.4s)

Rated load	400kg	1000	1600kg
				Speed of rotation	0.0433	0.0456	0.0462

Step b, calculating the sliding speed and the sliding distance of the unloaded lift car when the star-sealing contactor is in an ineffective state;

the parameters include car self-weight P, rated load Q, counterweight weight Cwt +0.5Q, system mass difference Mc-Cwt-P, empty car system total mass Mt-Cwt + P, F-system mass difference gravitational acceleration, m-empty car system total mass Mt, a-F/m, and car-sliding distance S-at²/2，

For example, the data of the empty car with the rated load of 400kg is calculated according to the data, and the data when the sliding time is 0.1S is as follows:

car self-weight P400

Rated load Q400

Weight of counterweight Cwt + kQ 600

System mass difference Mc-Cwt-P-200

Total mass Mt of no-load car system is 1000

Balance coefficient k is 0.5

Calculating that a is equal to F/m is equal to 1.96m/s²

t＝0.1s

V＝a*t＝0.2m/s

S＝9.8mm。

For example, the data of the empty car with the rated load of 400kg is calculated according to the data, and the data when the sliding time is 0.4S is as follows:

car self-weight P400

Rated load Q400

Weight of counterweight Cwt + kQ 600

System mass difference Mc-Cwt-P-200

Total mass Mt of no-load car system is 1000

Balance coefficient k is 0.5

Calculating that a is equal to F/m is equal to 1.96m/s²

t＝0.4s

V＝a*t＝0.78m/s

S＝156.8mm。

For example, when the car is an empty car with a rated load of 1000kg, and the sliding time is 0.1S:

car self weight P1100

Rated load Q1000

Weight of counterweight Cwt + kQ 1600

System mass difference Mc-Cwt-P-500

Total mass Mt of no-load car system is 2700

Balance coefficient k is 0.5

Calculating a ═ F/m ═ 1.815m/s²

t＝0.1s

V＝a*t＝0.18m/s

S＝9.074mm。

For example, when the car is an empty car with a rated load of 1000kg, and the sliding time is 0.4S:

car self weight P1100

Rated load Q1000

Weight of counterweight Cwt + kQ 1600

System mass difference Mc-Cwt-P-500

Total mass Mt of no-load car system is 2700

Balance coefficient k is 0.5

Calculating a ═ F/m ═ 1.815m/s²

t＝0.4s

V＝a*t＝0.73m/s

S＝145.2mm。

For example, when the sliding time of an empty car with a rated load of 1600kg is 0.1S:

car weight P1800

Rated load Q1600

Counterweight weight Cwt + kQ 2600

System mass difference Mc-Cwt-P-800

Total mass Mt 4400 of empty car system

Balance coefficient k is 0.5

Calculating a ═ F/m ═ 1.782m/s²

t＝0.1s

V＝a*t＝0.18m/s

S＝8.909mm。

For example, when the sliding time of an empty car with a rated load of 1600kg is 0.4S:

car weight P1800

Rated load Q1600

Counterweight weight Cwt + kQ 2600

System mass difference Mc-Cwt-P-800

Total mass Mt 4400 of empty car system

Balance coefficient k is 0.5

Calculating a ═ F/m ═ 1.782m/s²

t＝0.4s

V＝a*t＝0.71m/sS＝142.5mm。

And c, comparing the sliding distance of the satellite-sealed contactor in the non-effective state with the maximum idle stroke of the buffer (the elevator with the elevator speed less than or equal to 1.75m/s) to ensure that the sliding distance of the satellite-sealed contactor in the non-effective state is less than the maximum idle stroke of the buffer, thereby determining the maximum preset time, and selecting the minimum time based on the validity of the data.

For example, when the time is 0.4s and the star contact device is in an ineffective state, the rated load is 400kg, the empty car with the car self weight of 400kg is provided, the theoretical sliding distance of the elevator is 156.8mm, the value is very close to the maximum idle stroke of the buffer for the common elevator (the speed is less than or equal to 1.75m/s), the idle stroke of the buffer is larger when the speed is larger, the available time for testing is longer, but in order to ensure the universality of data and prevent the buffer from being impacted in the test as far as possible, the maximum testing time is not more than 0.4 s. When the time is 0.1S and the star-sealing contactor is in an invalid state, the rated load is 1600kg, the self weight of the car is 1800kg, the theoretical sliding distance of the elevator is 8.909mm, the value is very small, and the time is not less than 0.1S in order to ensure the validity of the data. That is, the car sliding distance when the star contact device is not in an effective state is larger than a certain sliding threshold value, so that the data is larger, and the speed data of the car can be truly reflected.

And d, determining the preset speed according to the average sliding speed value of the idle cage with various rated loads in the effective state of the star sealing contactor, the average sliding speed value of the idle cage with various rated loads in the non-effective state of the star sealing contactor and the minimum sliding speed value. For example, it can be seen from the above data that after 0.4s of the coasting time, the average coasting speed of the empty cars of the plural kinds of rated loads is (0.0433+0.0456+0.0462)/3 is 0.045 and is only 0.05m/s or less in the valid state of the star contact, and when the star contact is not valid, the average coasting speed value of the empty cars of the plural kinds of rated loads is (0.78+0.73+0.71)/3 is 0.74 and is 16.4 times the valid state of the star contact at the same time.

Further, when the coast time is 0.1s, the minimum speed in the satellite contactor inactive state is 0.18m/s, which is 3.89 of the speed in the coast time of 0.4s and the satellite contactor active state, the preset speed may be set to 0.1 m/s. That is, when the preset speed value is greater than the maximum preset time point, the average sliding speed value of the idle-load car with various rated loads in the effective state of the star-sealing contactor is at least 2 times of the average sliding speed value of the idle-load car with various rated loads in the effective state of the star-sealing contactor; and when the speed is smaller than the minimum preset time point, the minimum sliding speed value of the unloaded car with various rated loads is in the ineffective state of the star-sealing contact device. Therefore, the test accuracy can be ensured (the minimum speed of the star-sealing contactor when the test time is 0.1S is not effective is 0.18m/S, which is far greater than the speed of the elevator when the star-sealing contactor is effective, which is 0.0462m/S when the test time is 0.4S), and the safety can also be ensured.

Furthermore, because the car sliding test has certain abruptness, the test can be carried out when no person exists in the car, according to the regulation of the national standard of the elevator industry, the passenger elevator is dragged to move up and down by the suspension belt wound on the traction wheel of the driving main machine, the other side of the suspension belt is provided with a counterweight, the weight of the counterweight is equal to the self weight of the car plus a balance coefficient k multiplied by a rated load capacity, and according to the regulation of the national standard of the elevator industry, the k value is 0.4-0.5. Therefore, the weight of the car side is light when the car is unloaded, the difference is 40% -50% of the rated load capacity of the car, and the car can move upwards once sliding. Therefore, the step S1 further includes the step S0:

after the elevator control system confirms that no person exists in the elevator car, the door is automatically opened, the door is automatically closed along with the prompt tone of 30s after the completion, the outbound signal is not responded, and then the elevator is opened to the top floor leveling position. Wherein, the confirmation that no person in the lift car can pass but is not limited to the following one mode or the combination of several modes, 1) no external calling and internal selection signals exist within 3 minutes; 2) the car weighing device feeds back that no person is in the car; 3) and identifying the face of the camera in the car.

And detecting the star-sealing contactor by using the upward sliding of the car.

In the method for detecting an elevator star contact, before the step S0 and the step S1, the method further includes the step S00: the control system receives a detection trigger signal and proceeds to step S0, where the detection trigger signal is a detection instruction input from the outside or a detection instruction sent from the inside after the time reaches a preset time.

The invention further provides an electronic device, and in the embodiment, the detection method of the elevator star-sealed contactor can be applied to the electronic device to judge the detected real-time speed/real-time acceleration. Specifically, for the electronic device which needs to detect the elevator star contact, the function provided by the method for detecting the elevator star contact can be directly integrated on the electronic device, or the function runs on the electronic device in the form of a software development kit.

The following describes a hardware device architecture for implementing the detection method of the elevator star contact, and the electronic device includes a memory and at least one processor. The memory is used for storing program codes and various data, such as detection programs of the elevator star contact device installed in the electronic device, and the like, and realizing high-speed and automatic access to the programs or the data in the operation process 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 rewritable read-only memory, compact disc read-only or other optical disk storage, magnetic disk storage, tape storage, or any other computer-readable storage medium capable of being used to carry or store data.

The at least one processor may be composed of an integrated circuit, for example, a single packaged integrated circuit, or may be composed of a plurality of integrated circuits packaged with the same or different functions, including one or more central processing units, microprocessors, digital processing chips, graphics processors, and various control chips. The at least one processor is a control core of the electronic device, connects various components of the entire electronic device using various interfaces and lines, performs various functions of the electronic device and processes data, such as performing a function of detection of an elevator star contact, by operating or executing a program or a module stored in the memory, and calling data stored in the memory.

The detection method of the elevator star-sealed contactor can be divided into a plurality of functional modules consisting of program code segments, each functional module is a different divided program code corresponding to the detection method of the elevator star-sealed contactor, and the program codes of each program segment can be stored in a memory and executed by at least one processor so as to realize the detection method of the elevator star-sealed contactor.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting a star-sealed contactor for an elevator is characterized by comprising the following steps:

2. The method for detecting the star-sealed contactor for the elevator as claimed in claim 1, wherein the preset time is set by:

3. The method of detecting a star contact for an elevator according to claim 2,

the preset speed is determined according to the average sliding speed value when the star sealing contactor of the idle cage with various rated loads is in an effective state, the average sliding speed value and the minimum sliding speed value when the star sealing contactor of the idle cage with various rated loads is in an ineffective state, so that the preset speed value is larger than the average sliding speed value when the star sealing contactor of the idle cage with various rated loads is in an effective state at the maximum preset time and is smaller than the minimum sliding speed value when the star sealing contactor of the idle cage with various rated loads is in an ineffective state at the minimum preset time, and the average sliding speed value is at least 2 times of the average sliding speed value when the star sealing contactor of the idle cage with various rated loads is in an effective state at the maximum preset time.

4. The method as set forth in claim 1, wherein the real-time speed or the real-time acceleration of the rotation of the traction machine is determined by monitoring a signal fed back from the encoder.

5. The method for detecting the star-sealed contact for the elevator as claimed in claim 1, wherein before the elevator control system controls the car to stop running and all the brake devices of the elevator are opened, the elevator control system firstly confirms that no person is in the car and then opens the elevator to a top floor leveling position.

6. The method for detecting the star-sealed contactor for the elevator according to claim 1, wherein if the star-sealed contactor is determined to be in a non-effective state, the elevator control system controls all band-type brakes of the band-type brake device, and if the star-sealed contactor is determined to be in an effective state, the elevator control system switches the elevator to a running mode.

7. The method for detecting the star-sealed contactor for the elevator as claimed in claim 3, wherein the method for measuring the sliding speed value of the empty cage with any rated load in the effective state of the star-sealed contactor is as follows:

8. The method for detecting the star contact device for the elevator as claimed in claim 3, wherein the method for calculating the speed value and the sliding distance of the sliding car of the empty car with any rated load when the star contact device is not in an effective state comprises the following steps:

(1) the acceleration a is calculated to be F/m,

wherein F is Mc g,

Mc＝Cwt-P

m＝Cwt+P，

cwt is the weight of the counterweight;

p is the car weight;

g is the acceleration of the gravity and,

mc is poor system quality;

(2) calculating the speed V ═ a × t of the vehicle

Calculating the sliding distance S ═ at²/2

t is a preset time.

9. The method of detecting a star contact for an elevator according to claim 1,

the preset acceleration is determined according to the average rolling acceleration value when the star-sealed contactors of the idle cage with various rated loads are in an effective state, the average rolling acceleration value and the minimum rolling acceleration value when the star-sealed contactors of the idle cage with various rated loads are in a non-effective state,

10. An electronic device, comprising a memory and at least one processor, wherein the memory has stored therein at least one instruction, which when executed by the at least one processor, implements the method of detecting a star contact for an elevator of any of claims 1 to 9.