CN107016211B - Cableway overspeed protection method - Google Patents
Cableway overspeed protection method Download PDFInfo
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- CN107016211B CN107016211B CN201710263846.8A CN201710263846A CN107016211B CN 107016211 B CN107016211 B CN 107016211B CN 201710263846 A CN201710263846 A CN 201710263846A CN 107016211 B CN107016211 B CN 107016211B
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- cableway
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- overspeed protection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
- B61B12/00—Component parts, details or accessories not provided for in groups B61B7/00 - B61B11/00
- B61B12/06—Safety devices or measures against cable fracture
Abstract
The invention discloses a cableway overspeed protection method, which comprises the steps of detecting the running stage and the running speed of a cableway; and carrying out overspeed protection on the cableway according to the calculated overspeed protection threshold value according to the running speed and the running stage of the cableway. The method for protecting the overspeed of the cableway realizes scientific protection of the overspeed protection of the cableway by scientifically and reasonably calculating the overspeed protection threshold values in the acceleration stage, the constant speed stage and the deceleration stage, and the method provided by the invention uses historical data to calculate the overspeed protection threshold values, so that the reliability is high, and the method is simple, practical, scientific and reasonable.
Description
Technical Field
The invention particularly relates to a cableway overspeed protection method.
Background
The cableway has a wide application range, and is widely applied to places such as tourist attractions in mountainous areas. The reciprocating type cableway is a common cableway form, has strong adaptability to natural terrains, particularly places with large span and deep grooves, simultaneously passengers are not influenced by climatic conditions in a carriage, and has strong climbing capability, high running speed, strong carrying capability and convenient maintenance. Therefore, the method is widely applied to tourist sites. Reciprocating ropeways typically have two steel cables, one being a load carrying cable and one being a haul cable. The carriage runs on the bearing cable, the traction cable is fixedly connected with the carriage, and the traction motor pulls the carriage to reciprocate on the bearing cable through the traction cable. Passengers get on or off the train in the station.
The running speed of the reciprocating cableway is generally 2m/s to 10 m/s. In order to ensure the safety of passengers in the carriage, the cableway runs in the processes of acceleration, uniform speed and deceleration. When the carriage is out of the station, the traction motor of the cableway drives the carriage to accelerate from 0m/s to the maximum running speed. When the carriage enters the station, the traction motor of the cableway drags the carriage to decelerate from the maximum running speed, and the carriage is parked when the carriage reaches the parking space. How to determine whether the operation of the cableway is overspeed or not is very important content in the safe operation of the cableway. If the cableway runs at an overspeed due to a fault, the running speed of the carriage is kept high when the carriage arrives at a parking space, so that a station rushing accident occurs, and the safety of passengers is greatly threatened. Therefore, the method for protecting the ropeway from overspeed is of great significance.
The overspeed protection method mentioned in patent CN 203727364U samples and picks up the actual running speed Vi of the steel rope of the cableway, calculates Vc (1+ 10%) Vi, and controls the cableway to stop automatically by comparing Vc and Vi. This method has the obvious drawback that since Vi is greater than or equal to 0 and Vc is (1+ 10%) Vi, Vc is always greater than or equal to Vi regardless of the occurrence of overspeed or normal conditions. Therefore, this method does not really realize the overspeed protection of the cableway.
Another overspeed protection is realized by a tachogenerator motor, the tachogenerator motor detects the main motor of the ropeway and generates a voltage value, the voltage value is compared with a fixed voltage value, and when the voltage value of the tachogenerator exceeds the set overspeed protection voltage, the motor is controlled to brake and stop. The method can realize the overspeed protection of the acceleration section and the uniform speed section, and can not realize the overspeed protection of the deceleration section. If the deceleration is reduced to half in the deceleration section and the deceleration is not continued, the overspeed protection cannot work, so that the running speed of the carriage is kept higher when the carriage arrives at the parking space, the station rushing accident is caused, and the safety of passengers is greatly threatened.
Disclosure of Invention
The invention aims to provide a cableway overspeed protection method which can realize scientific protection of cableway overspeed and has high reliability and good effect.
The invention provides a cableway overspeed protection method, which comprises the following steps:
s1, detecting the operation stage and the operation speed of the cableway when the cableway normally operates; the operation stage comprises an acceleration stage, a constant speed stage and a deceleration stage;
s2, according to the running speed and the running stage of the cableway detected in the step S1, carrying out cable overload overspeed protection according to the following rules:
if the operation stage of the cableway is an acceleration or uniform speed stage, calculating an overspeed protection threshold value by adopting the following formula, and performing overspeed protection on the cableway when the operation speed of the cableway is greater than or equal to the overspeed protection threshold value:
Vsh＝1.1Vset1
in the formula VshFor overspeed protection threshold, Vset1Setting a speed value for the cableway at a constant speed stage;
and if the cableway is in the deceleration stage, calculating the overspeed protection threshold value of the cableway in the deceleration stage in real time, and carrying out overspeed protection on the cableway when the running speed of the cableway is greater than or equal to the overspeed protection threshold value.
Step S2 is a step of calculating the overspeed protection threshold of the cableway at the deceleration stage, specifically, the overspeed protection threshold is calculated by using the following formula:
Vsh(t)＝1.1*((Vset2-Vset1)/t2*t+Vset1)
in the formula Vsh(t) is an overspeed protection threshold; vset2Setting a speed set value in a cableway deceleration stage; vset1Setting a speed set value for a cableway constant speed stage; t is t2The running time of the set cableway deceleration stage is set; t is the actual running time of the cableway during the deceleration phase.
Step S2, where the overspeed protection threshold of the cableway at the deceleration stage is calculated, specifically, the overspeed protection threshold is calculated by the following steps:
A. acquiring an actual speed curve of the cableway and a set value curve of the cableway during each operation of the cableway according to historical data;
B. calculating the time difference between the moment when the actual speed curve of the cableway starts to descend and the moment when the set value curve of the cableway starts to descend in each operation, and solving the average value to obtain the average delay time delta tp;
C. when the cableway runs into a deceleration stage, after the average delay time delta tp, the actual overspeed protection threshold value is calculated by adopting the following formula:
Vsh(t)＝1.1*((Vset2-Vset1)/t2*t+Vset1)
in the formula Vsh(t) is an overspeed protection threshold; vset2Setting a speed set value in a cableway deceleration stage; vset1Setting a speed set value for a cableway constant speed stage; t is t2The running time of the set cableway deceleration stage is set; t is the actual running time of the cableway during the deceleration phase.
Step S2, where the overspeed protection threshold of the cableway at the deceleration stage is calculated, specifically, the overspeed protection threshold is calculated by the following steps:
a. according to historical data, acquiring N groups of running data of the cableway according to three conditions of no-load, half-load and full-load of the cableway between the moment when the cableway is started to the moment when the cableway is decelerated; the collected operation data is the collection time tiAnd a collection time tiCableway running speed Vi(ii) a N is a natural number, the larger the value of N is, the more accurate the overspeed protection control is, and i is the serial number of the collected operation data;
b. setting a deceleration curve of a cableway deceleration section as V (t) ═ a × t + b, and solving a corresponding parameter a when the following function takes a minimum valueminAnd bmin：
In the formula NeB, the total number of the data collected in the step a;
c. with V (t) ═ amin*t+bminAnd calculating a speed protection threshold value of the cableway deceleration stage for the speed protection formula of the cableway deceleration stage.
Calculation of a in step bminAnd bminSpecifically, a is calculated by calculating partial derivativeminAnd bmin。
The method for protecting the overspeed of the cableway realizes scientific protection of the overspeed protection of the cableway by scientifically and reasonably calculating the overspeed protection threshold values in the acceleration stage, the constant speed stage and the deceleration stage, and the method provided by the invention uses historical data to calculate the overspeed protection threshold values, so that the reliability is high, and the method is simple, practical, scientific and reasonable.
Drawings
FIG. 1 is a process flow diagram of the process of the present invention.
Detailed Description
FIG. 1 shows a flow chart of the method of the present invention: the invention provides a cableway overspeed protection method, which comprises the following steps:
s1, detecting the operation stage and the operation speed of the cableway when the cableway normally operates; the operation stage comprises an acceleration stage, a constant speed stage and a deceleration stage;
s2, according to the running speed and the running stage of the cableway detected in the step S1, carrying out cable overload overspeed protection according to the following rules:
if the operation stage of the cableway is an acceleration or uniform speed stage, calculating an overspeed protection threshold value by adopting the following formula, and performing overspeed protection on the cableway when the operation speed of the cableway is greater than or equal to the overspeed protection threshold value:
Vsh＝1.1Vset1
in the formula VshFor overspeed protection threshold, Vset1Setting a speed value for the cableway at a constant speed stage;
if the cableway is in the deceleration stage, calculating the overspeed protection threshold value of the cableway in the deceleration stage in real time according to the following method, and performing overspeed protection on the cableway when the running speed of the cableway is greater than or equal to the overspeed protection threshold value.
The method comprises the following steps: the calculation of the overspeed protection threshold value of the cableway at the deceleration stage specifically adopts the following formula to calculate the overspeed protection threshold value:
Vsh(t)＝1.1*((Vset2-Vset1)/t2*t+Vset1)
in the formula Vsh(t) is an overspeed protection threshold; vset2Setting a speed set value in a cableway deceleration stage; vset1Setting a speed set value for a cableway constant speed stage; t is t2The running time of the set cableway deceleration stage is set; t is the actual running time of the cableway during the deceleration phase.
The second method comprises the following steps: as an improvement of the first method, after the cableway controller detects the deceleration signal of the cableway, the controller sends a deceleration instruction until the cableway actually starts to decelerate, and a certain time delay exists, and the formula in the first method calculates the overspeed protection threshold value Vsh(t) is less than 1.1 times of the corresponding actual speed, and the overspeed protection is too conservative by using the method; therefore, the overspeed protection threshold can be calculated by specifically adopting the following steps:
A. acquiring an actual speed curve of the cableway and a set value curve of the cableway during each operation of the cableway according to historical data;
B. calculating the time difference between the moment when the actual speed curve of the cableway starts to descend and the moment when the set value curve of the cableway starts to descend in each operation, and solving the average value to obtain the average delay time delta tp;
C. when the cableway runs into a deceleration stage, after the average delay time delta tp, the actual overspeed protection threshold value is calculated by adopting the following formula:
Vsh(t)＝1.1*((Vset2-Vset1)/t2*t+Vset1)
in the formula Vsh(t) is an overspeed protection threshold; vset2Setting a speed set value in a cableway deceleration stage; vset1Setting a speed set value for a cableway constant speed stage; t is t2The running time of the set cableway deceleration stage is set; t is the actual running time of the cableway during the deceleration phase.
The third method comprises the following steps: however, since the curves of each deceleration of the cableway are not exactly the same, in order to perform overspeed protection on various operating conditions, as an improvement of the second method, the overspeed protection threshold value of the cableway in the deceleration stage is calculated by specifically adopting the following steps:
a. according to historical data, acquiring N groups of running data of the cableway according to three conditions of no-load, half-load and full-load of the cableway between the moment when the cableway is started to the moment when the cableway is decelerated; the collected operation data is the collection time tiAnd a collection time tiCableway running speed Vi(ii) a N is a natural number, the larger the value of N is, the more accurate the overspeed protection control is, and i is the serial number of the collected operation data;
b. setting a deceleration curve of a cableway deceleration section as V (t) ═ a × t + b, and solving a corresponding parameter a when the following function takes a minimum valueminAnd bmin：
In the formulaNeB, the total number of the data collected in the step a;
when calculating, the partial derivative is calculated by the following formula:
thereby obtaining
Wherein
c. With V (t) ═ amin*t+bminAnd calculating a speed protection threshold value of the cableway deceleration stage for the speed protection formula of the cableway deceleration stage.
Claims (2)
1. A cableway overspeed protection method comprises the following steps:
s1, detecting the operation stage and the operation speed of the cableway when the cableway normally operates; the operation stage comprises an acceleration stage, a constant speed stage and a deceleration stage;
s2, according to the running speed and the running stage of the cableway detected in the step S1, carrying out cable overload overspeed protection according to the following rules:
if the operation stage of the cableway is an acceleration or uniform speed stage, calculating an overspeed protection threshold value by adopting the following formula, and performing overspeed protection on the cableway when the operation speed of the cableway is greater than or equal to the overspeed protection threshold value:
Vsh＝1.1Vset1
in the formula VshFor overspeed protection threshold, Vset1Setting a speed value for the cableway at a constant speed stage;
if the cableway is in the deceleration stage, calculating the overspeed protection threshold value of the cableway in the deceleration stage in real time, and carrying out overspeed protection on the cableway when the running speed of the cableway is greater than or equal to the overspeed protection threshold value; specifically, the overspeed protection threshold is calculated by the following steps:
a. according to historical data, acquiring N groups of running data of the cableway according to three conditions of no-load, half-load and full-load of the cableway between the moment when the cableway is started to the moment when the cableway is decelerated; the collected operation data is the collection time tiAnd a collection time tiCableway running speed Vi(ii) a N is a natural number, the larger the value of N is, the more accurate the overspeed protection control is, and i is the serial number of the collected operation data;
b. setting a deceleration curve of a cableway deceleration section as V (t) ═ a × t + b, and solving a corresponding parameter a when the following function takes a minimum valueminAnd bmin：
In the formula NeB, the total number of the data collected in the step a;
c. with V (t) ═ amin*t+bminAnd calculating a speed protection threshold value of the cableway deceleration stage for the speed protection formula of the cableway deceleration stage.
2. Cableway overspeed protection method according to claim 1, characterized in that said calculation a of step b is carried outminAnd bminSpecifically, a is calculated by calculating partial derivativeminAnd bmin。
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| CN201710263846.8A CN107016211B (en) | 2017-04-21 | 2017-04-21 | Cableway overspeed protection method |
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| CN201710263846.8A CN107016211B (en) | 2017-04-21 | 2017-04-21 | Cableway overspeed protection method |
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| CN108715167A (en) * | 2018-05-25 | 2018-10-30 | 北京起重运输机械设计研究院有限公司 | A kind of cableway guard method, apparatus and system |
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| JP2006044348A (en) * | 2004-08-02 | 2006-02-16 | Nissan Motor Co Ltd | Motor overspeed preventing device for hybrid transmission |
| WO2012095111A1 (en) * | 2011-01-13 | 2012-07-19 | Vestas Wind Systems A/S | Testing an overspeed protection system of a wind turbine |
| CN203727364U (en) * | 2013-12-13 | 2014-07-23 | 四川矿山机器（集团）有限责任公司 | Circulating type ropeway over-speed protection system |
| CN204452447U (en) * | 2015-03-20 | 2015-07-08 | 汤大为 | A kind of pulsating cableway enters the station overspeed protection system |
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