Monitoring method for multi-car intelligent parallel elevator car drive

Abstract

The application discloses a kind of for the monitoring method of multiple-car intelligent parallel elevator car driving, elevator system includes multiple cars, at least two main tracks and switching tracks, the switching tracks are provided with multiple, the switching tracks are used to link two different main tracks, the car is equipped with driving wheel, the car is through driving wheel on main track and switching track and is carried out up, down or switching track operation, and the car driving monitoring method is judged by comparing the theoretical displacement of car and absolute displacement.The dynamic monitoring method of the application ensures that the car drive is normal, there is no car coasting phenomenon, and ensures the reliability and safety of elevator operation.

Description

Technical Field

[0001] This invention relates to the field of elevator operation monitoring technology, specifically to a monitoring method for the car drive of a multi-car intelligent parallel elevator. Background Technology

[0002] Currently, elevator cars widely use wire rope traction drive, meaning only one car can be installed in a single shaft. While single-car elevators can meet the needs of low-rise buildings with low passenger flow, their drawbacks—long waiting times and low transport efficiency—are significantly amplified in high-rise or super high-rise buildings with high population density. Adding more elevator shafts and corresponding cars would occupy a significant amount of building space, substantially increasing costs, and the problem of low transport efficiency would still persist.

[0003] With the continuous development of engineering technology, multi-car operation modes such as double-deck elevators, double-car elevators, and circular or bifurcated circular elevators have gradually emerged. However, in these known multi-car elevator operation modes, the cars are all located on the same track within the same shaft. The elevator cars between different shafts cannot switch tracks, and they cannot overtake each other. With the dramatic increase in transportation volume, the current multi-car operation mode not only significantly reduces the space utilization rate of buildings, but also fails to fundamentally solve the problem of low elevator transportation efficiency.

[0004] The multi-car intelligent parallel elevator researched by the applicant is a self-driving elevator. The drive unit requires an external force-applying mechanism to press the drive wheel against the guide rail, generating frictional driving force. Factors such as the magnitude of the drive wheel pressing force, the condition of the guide rail surface, tire wear, and the environment of the shaft all affect the frictional driving force. If the frictional driving force is insufficient, the drive wheel will slip, or even fail to drive the elevator or cause it to run away, affecting the reliability and safety of elevator operation. Summary of the Invention

[0005] The technical problem to be solved by this invention is: in view of the technical problems existing in the prior art, this invention provides a monitoring method for the car drive of a multi-car intelligent parallel elevator, to ensure that the car drive is normal and there is no slippage, and to ensure the reliability and safety of elevator operation.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0007] A monitoring method for car drive in a multi-car intelligent parallel elevator is disclosed. The elevator system includes multiple cars, at least two main tracks, and switching tracks. Multiple switching tracks are provided to connect two different main tracks. Each car is equipped with a drive wheel, and the car moves up, down, or switches tracks on the main tracks and switching tracks via the drive wheel. The car drive monitoring method is based on comparing the theoretical displacement and absolute displacement of the car.

[0008] As a further improvement to the above technical solution:

[0009] Preferably, the car drive monitoring method described above includes the following steps:

[0010] 1) Real-time acquisition of the rotational speed of the drive wheels and the absolute displacement of the car;

[0011] 2) Calculate the theoretical displacement of the car by the rotational speed of the drive wheels;

[0012] 3) Compare the theoretical displacement and the absolute displacement, and calculate the output deviation rate and its trend;

[0013] 4) Determine whether the drive wheel is slipping based on the output deviation rate and its trend.

[0014] In the above method, preferably, in step 1), a monitoring position is selected along the car's running direction to monitor and obtain the rotational speed of the drive wheels and the absolute displacement of the car.

[0015] In the above method, preferably, the monitoring locations include at least the detection points located on the main track and the track change locations.

[0016] In the above method, preferably, the track change position includes the connection point of two track segments.

[0017] In the above method, preferably, the detection points of the main track include continuous equidistant points and leveling positions on the main track.

[0018] In the above method, preferably, the leveling position is the stopping point of the car at the leveling point.

[0019] In the above method, preferably, in step 1), the absolute displacement of the car is set as S2, where S2 is the actual distance the car moves.

[0020] In the above method, preferably, in step 2), the theoretical displacement is set as S1.

[0021] S1=π×d×N1

[0022] Where d is the diameter of the drive wheel;

[0023] N1 is the rotational speed of the drive wheel.

[0024] In the above method, preferably, in step 4), at least a safety zone is provided. When the deviation rate and the trend of change are within the safety zone, the car operates normally; when the deviation rate and the trend of change exceed the safety zone, the car stops operating.

[0025] In the above method, preferably, the drive wheel is equipped with a speed sensor, which is used to detect the theoretical displacement of the car.

[0026] In the above method, preferably, the elevator system is equipped with a position detection device, which is used to detect the absolute displacement of the car and the actual moving distance of the car.

[0027] The monitoring method for multi-car intelligent parallel elevator car drive provided by this invention has the following advantages compared with the prior art:

[0028] (1) The monitoring method for multi-car intelligent parallel elevator car drive of the present invention sets up absolute position monitoring and relative position monitoring. By comparing the position information difference between the two, it is determined whether a sliding phenomenon occurs and whether the car friction meets the requirements.

[0029] (2) The monitoring method for multi-car intelligent parallel elevator car drive of the present invention includes continuous equidistant points on the main track, track change positions and leveling positions, which include points on the main track and switching track where conditions may occur, thus ensuring the safe operation of the drive wheels during car operation.

[0030] (3) The monitoring method for multi-car intelligent parallel elevator car drive of the present invention compares the theoretical displacement and absolute displacement of the car to determine whether there is an abnormality. If there is an abnormality, an alarm needs to be set up and maintenance is required to ensure that the car drive is normal and there is no slippage, thus ensuring the reliability and safety of elevator operation. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating the present invention. Detailed Implementation

[0032] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0033] Figure 1This invention illustrates one embodiment of a monitoring method for car drive in a multi-car intelligent parallel elevator. The elevator system includes multiple cars, at least two main tracks, and switching tracks. The multiple main tracks form parallel tracks, with one main track installed in each shaft. Multiple switching tracks are provided, positioned between two main tracks to connect them. Multiple cars can run on the same main track. During upward or downward movement, the cars switch main tracks via switching tracks to continue moving upward or downward. The structure of the elevator system has been described in the applicant's previous patent applications.

[0034] In this embodiment, the switching track includes two arc-shaped tracks and an inclined track. The arc-shaped tracks connect to the main track, and the inclined track connects the two arc-shaped tracks. The car is equipped with a drive device, which includes a drive wheel and a force-applying mechanism. The drive wheel rolls on the main track or the switching track, driving the car to move upward, downward, or switch tracks. Since the car has no traction structure, the force-applying mechanism presses the drive wheel against the main track or the switching track, generating a frictional driving force. The load applied by the force-applying mechanism directly determines the magnitude of the frictional driving force.

[0035] In this embodiment, a speed sensor is installed on the drive wheel to obtain the rotation distance of the drive wheel and thus the theoretical displacement of the car. The elevator system is equipped with a position detection device to obtain the absolute displacement of the car. The position detection device can be a distance position detection device such as a magnetic grating ruler or optical grating ruler installed on the main rail and the switching rail.

[0036] The drive wheel slippage monitoring method of the present invention includes the following steps:

[0037] (1) Dynamically and in real-time acquire the rotational speed N1 of the drive wheels and the absolute displacement S2 of the car. Select representative positions along the car's running direction for monitoring and data acquisition. These representative positions can be continuous equidistant points on the main track, leveling positions, and track change positions. The leveling position is the position where the leveling load changes, i.e., the car's stopping position. At this time, the car's load will change in real time and needs to be monitored. In addition, the track change position is important because curved and inclined tracks will cause changes in the force on the drive wheels.

[0038] (2) Calculate the theoretical displacement S1 of the car, S1=π×d×N1, where d is the diameter of the drive wheel.

[0039] (3) Compare the theoretical displacement S1 and the absolute displacement S2, and calculate the output deviation rate and the trend Δ. This comparison can be a comparison of the same representative position in different running periods, or a comparison between different representative positions in different time periods. Different time periods can include different running conditions, such as up and down, up and down, etc., and can also be combined with the changes under different loads for comprehensive consideration.

[0040] (4) Determine whether the drive wheel slips based on the output deviation rate and the trend Δ, and determine the degree and frequency of slippage.

[0041] The deviation rate and its trend Δ are set with multiple slippage determination zones Δ1, Δ2...Δ as needed. n Different levels of slippage trigger different operational instructions:

[0042] 1) Let Δ1 = S1. Since Δ does not exceed Δ1, there is no slippage, no warning is needed, and the car operates normally.

[0043] 2) If Δ2 = 98%S1, and Δ exceeds Δ1 but does not reach Δ2, a warning will be issued. The car can operate normally, but there is a safety hazard.

[0044] 3) Set Δ3 = 95%S1. When Δ exceeds Δ2 but does not reach Δ3, a warning is issued to indicate that the car is abnormal. The nearest leveling floor in the direction of the car's movement is obtained, the car stops at the nearest leveling floor, the floor door is opened to release passengers, and the car stops running and waits for maintenance and inspection.

[0045] 4) If Δ exceeds Δ3, an alarm will be triggered and the car will be stopped immediately, awaiting emergency rescue and maintenance inspection.

[0046] Other structures involved in this invention are described in the applicant's previous patent applications and can be fully understood by those skilled in the art using conventional techniques. Therefore, they will not be described again here.

[0047] The above embodiments are merely preferred examples of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A monitoring method for multi-car intelligent parallel elevator car drive, the elevator system comprising a plurality of cars, at least two main tracks and a switching track, the switching track being provided in plurality, the switching track being used to link two different main tracks, the car being provided with a drive wheel, the car being run on the main track and the switching track by the drive wheel in up, down or switching track operation, characterized in that, The car driving monitoring method is judged by comparing the theoretical displacement of the car and the absolute displacement, comprising the following steps: 1) Real-time acquisition of the rotational speed of the driving wheel and the absolute displacement of the car; 2) Calculate the theoretical displacement of the car through the rotational speed of the driving wheel; 3) Compare the theoretical displacement and the absolute displacement, calculate the output deviation and the change trend; 4) Judge whether the driving wheel is slipping according to the output deviation rate and the change trend; Wherein: In the step 2), the theoretical displacement is S1, S1 = π × d × N1 Wherein, d is the diameter of the driving wheel; N1 is the rotational speed of the driving wheel; The deviation rate and the change trend Δ are provided with multiple slip degree determination areas Δ1, Δ2... Δn according to needs, and the operation instructions performed by different levels of slip degree are different; (1) Δ1 = S1, Δ does not exceed Δ1, no slip phenomenon, no need to prompt warning, the car runs normally; (2) Δ2 = 98% S1, Δ exceeds Δ1 and does not reach Δ2, prompt warning, the car can run normally, but there is a security risk; (3) Δ3 = 95% S1, Δ exceeds Δ2 and does not reach Δ3, prompt warning, judge the car to appear abnormal, get the nearest landing of the car running direction, the car stops at the nearest landing, opens the landing door to discharge passengers, and stops running, waits for maintenance inspection; (4) Δ exceeds Δ3, alarm and stop immediately, the car stops immediately, waits for emergency rescue and maintenance inspection.

2. The monitoring method for multi-car intelligent parallel elevator car drive of claim 1, wherein, In the step 1), the monitoring position is selected along the running direction of the car to monitor and acquire the rotational speed of the driving wheel and the absolute displacement of the car.

3. The monitoring method for multi-car intelligent parallel elevator car drive of claim 2, wherein, The monitoring position at least includes the detection point on the main track and the track change position.

4. The monitoring method for multi-car intelligent parallel elevator car drive of claim 3, wherein, The track change position includes the connection between two track sections.

5. The monitoring method for multi-car intelligent parallel elevator car drive of claim 4, wherein, The detection point of the main track includes continuous equidistant points and landing positions on the main track.

6. The monitoring method for multi-car intelligent parallel elevator car drive of claim 5, wherein, The landing position is the parking place of the car at the landing.

7. The monitoring method for multi-car intelligent parallel elevator car drive of claim 1, wherein, In the step 1), the absolute displacement of the car is S2, S2 is the actual distance of the car movement.

Images