CN112320262B - Overload early warning method for coal mine coal flow main conveying device - Google Patents
Overload early warning method for coal mine coal flow main conveying device Download PDFInfo
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- CN112320262B CN112320262B CN202011106138.1A CN202011106138A CN112320262B CN 112320262 B CN112320262 B CN 112320262B CN 202011106138 A CN202011106138 A CN 202011106138A CN 112320262 B CN112320262 B CN 112320262B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
- B65G2201/045—Sand, soil and mineral ore
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Abstract
The invention relates to the technical field of coal mine safe transportation, in particular to an overload early warning method for a coal mine coal flow main transportation device, and aims to solve the technical problem that an existing coal flow main transportation system is easy to cause overload shutdown. The following technical scheme is adopted: 1) calculating the real-time coal loading amount on the early warning belt; 2) reading a real-time power value on the early warning belt; 3) taking the real-time coal loading amount calculated in the step 1) and the real-time power value read out from the step 2) at the same moment as a pair of data, and acquiring at least 200 pairs of data in a continuous time period with fixed time duration, wherein the continuous time period is continuously updated at the end of the current moment; 4) performing linear fitting on the data by adopting a least square method to obtain a relational expression of the coal carrying quantity and the early warning belt power; 5) estimating the coal loading after X minutes; 6) and calculating the power value of the early warning belt after X minutes, and comparing the power value of the early warning belt with a preset value.
Description
Technical Field
The invention relates to the technical field of coal mine safe transportation, in particular to an overload early warning method for a coal mine coal flow main transportation device.
Background
The coal flow main conveying device has the conditions of multi-section conveying, multi-coal flow collection main conveying and the like, the traditional mode usually adjusts the coal quantity of a main conveying belt conveyor manually according to the coal output quantity of different working surfaces, the balance of the conveying quantity of the belt conveyor is difficult to ensure, the phenomena of excessive coal scattering, coal stacking, long-time full-speed operation under the condition of small coal quantity or no-load state and the like often occur. The method not only causes the waste of electric energy, but also increases the abrasion loss of the rotating parts, the conveying belts and the like of the belt conveyor, reduces the service life, and more seriously causes the overload protection shutdown of the main conveying belt when the coal carrying amount of the belt is too large, thereby seriously affecting the exploitation rate of the whole mine excavation system.
Disclosure of Invention
The invention aims to solve the technical problem that the existing coal flow main transportation system is easy to cause overload shutdown.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an overload early warning method for a coal mine coal flow main conveying device sequentially comprises the following steps:
1) collecting data of belt weighers of all working face crossheading, calculating respective time length of coal coming out of each crossheading and entering an early warning belt by combining the length of the belt behind the belt weigher and the running speed, calculating time of the coal passing through the early warning belt by combining the length of the early warning belt and the running speed, and calculating real-time coal loading amount on the early warning belt in an accumulation mode;
2) reading a real-time power value on the early warning belt;
3) taking the real-time coal loading amount calculated in the step 1) and the real-time power value read out from the step 2) at the same moment as a pair of data, and acquiring at least 200 pairs of data in a continuous time period with fixed time duration, wherein the continuous time period is continuously updated at the end of the current moment;
4) performing linear fitting on the data by adopting a least square method to obtain a relational expression of the coal carrying quantity and the early warning belt power;
5) estimating the coal loading after X minutes, specifically adopting the following method: setting the time required for coal to reach the early warning belt from the crossheading belt scale as M minutes, selecting the belt scale value read before (M-X) minutes if M is more than or equal to X, selecting the belt scale value read at the moment if M is less than X, then adding all the belt scale values, and combining the coal amount reserved on the early warning belt to obtain the coal carrying amount after X minutes; wherein, at least one gate groove corresponds to M value smaller than X;
6) substituting the coal loading amount after X minutes obtained in the step 5) into the relational expression obtained in the step 4), calculating the power value of the early warning belt after X minutes, and comparing the power value of the early warning belt with a preset value.
The invention has the beneficial effects that:
the invention provides an overload early warning method for a coal mine coal flow main conveying device, which can predict the early warning belt power after X minutes, and can adjust the coal output of a working face in advance if the overload condition is predicted, thereby avoiding the overload shutdown accident of the coal flow main conveying device, ensuring the continuous operation of the coal flow main conveying device and further ensuring the safe, efficient and balanced production of a mine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The invention discloses an overload early warning method for a coal mine coal flow main conveying device, which sequentially comprises the following steps of:
1) the method comprises the steps of collecting data of belt weighers of all working face crossheading, calculating respective time length of coal coming out of each crossheading and entering an early warning belt by combining the length of the belt behind the belt weighers and the operation speed, calculating time of the coal passing through the early warning belt by combining the length of the early warning belt and the operation speed, and calculating real-time coal loading amount on the early warning belt in an accumulation mode. Specifically, how to calculate the real-time coal carrying amount of the early warning belt according to the parameters is a technology known by persons in the art, and the specific operations are as follows: if the time for coal to reach the early warning belt from the crossheading belt scale is T1In minutes, the quantity of coal which newly enters the early warning belt corresponding to the crossheading is calculated and should be referenced to the belt weigher at T1Reading before minute, if the time from entering the early warning belt to leaving the early warning belt is T2In minutes, T is considered when calculating the real-time coal loading amount of the early warning belt2All coal in the time period between minutes ago and the present time.
2) And reading the real-time power value on the early warning belt.
3) And taking the real-time coal loading amount calculated in the step 1) and the real-time power value read out from the step 2) at the same time as a pair of data, and acquiring at least 200 pairs of data in a continuous time period with a fixed time length, wherein the continuous time period is continuously updated at the end of the current time. In principle, the more data the higher the accuracy, but the excessive data amount affects the calculation speed, and it is preferable to adopt 200 pairs of data, which can guarantee the calculation speed, and the accuracy can also guarantee that the time span of the continuous period is about 20 minutes. The principle of data acquisition: j avoids abnormal situations, such as shutdown overhaul, restart, etc.; k ensures temporal continuity; l guarantees randomness. Preferably, the update cycle of the continuous time interval is 5 seconds, and the continuous time interval is updated continuously, so that the long-time data in the set is replaced by the latest real data, the reality of the latest data can be ensured, and the error of the electronic scale or other mechanisms along with the length of the using time edge can be adjusted.
4) And performing linear fitting on the data by adopting a least square method to obtain a relational expression of the coal carrying quantity and the early warning belt power. The linear fitting of the data set by using the least square method belongs to the known technology in the field, and two parameters of slope and intercept are mainly determined. Further, unreasonable data is removed from at least 200 pairs of data acquired in the step 3), then the remaining data are sorted, three pairs of data corresponding to the maximum coal carrying quantity, the minimum coal carrying quantity and the median are selected as calculation feature points, and the fitting mode is more convenient and accurate to calculate by utilizing a feature point fitting relational expression.
5) Estimating the coal loading after X minutes, specifically adopting the following method: setting the time required for coal to reach the early warning belt from the crossheading belt scale as M minutes, selecting the belt scale value read before (M-X) minutes if M is more than or equal to X, selecting the belt scale value read at the moment if M is less than X, then adding all the belt scale values, and combining the coal amount reserved on the early warning belt to obtain the coal carrying amount after X minutes; wherein, at least one gate groove corresponds to M value smaller than X. This determines that X ≧ M is required if the prediction is of practical significanceminTherefore, when the overload is estimated to occur, the coal output of the corresponding crossheading with M < X can be adjusted, and the overload shutdown accident is eliminated. If M of all the gate roads is larger than X, overload can occur even after X minutes is predicted, and the coal can not be adjusted again because the coal enters the subsequent belt conveying process, so that the practical significance is lost.
6) Substituting the coal loading amount after X minutes obtained in the step 5) into the relational expression obtained in the step 4), calculating the early warning belt power value after X minutes, and comparing the early warning belt power value with a preset value. And if the overload phenomenon exists, adjusting the coal output of the corresponding crossheading with M smaller than X, so as to eliminate overload shutdown accidents. The device can be provided with a buzzer and the like, and can give out sound and light alarm to remind an operator when the overload phenomenon is estimated.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (2)
1. An overload early warning method for a coal mine coal flow main conveying device is characterized by sequentially comprising the following steps:
1) collecting data of belt weighers of all working face crossheading, calculating respective time length of coal coming out of each crossheading and entering an early warning belt by combining the length of the belt behind the belt weigher and the running speed, calculating time of the coal passing through the early warning belt by combining the length of the early warning belt and the running speed, and calculating real-time coal loading amount on the early warning belt in an accumulation mode;
2) reading a real-time power value on the early warning belt;
3) taking the real-time coal loading amount calculated in the step 1) and the real-time power value read out from the step 2) at the same moment as a pair of data, and acquiring at least 200 pairs of data in a continuous time period with fixed time duration, wherein the continuous time period is continuously updated at the end of the current moment; the update period of the continuous period is 5 seconds;
4) performing linear fitting on the data by adopting a least square method to obtain a relational expression of the coal carrying quantity and the early warning belt power;
5) estimating the coal loading after X minutes, specifically adopting the following method: setting the time required for coal to reach the early warning belt from the crossheading belt scale as M minutes, selecting the belt scale value read before (M-X) minutes if M is more than or equal to X, selecting the belt scale value read at the moment if M is less than X, then adding all the belt scale values, and combining the coal amount reserved on the early warning belt to obtain the coal carrying amount after X minutes; wherein, at least one gate groove corresponds to M value smaller than X;
6) substituting the coal loading amount after X minutes obtained in the step 5) into the relational expression obtained in the step 4), calculating the early warning belt power value after X minutes, and comparing the early warning belt power value with a preset value.
2. The coal mine coal flow main transportation device overload early warning method according to claim 1, characterized by comprising the following steps: in step 4), unreasonable data is removed from at least 200 pairs of data acquired in step 3), then the remaining data are sorted, three pairs of data corresponding to the largest coal carrying amount, the smallest coal carrying amount and the median are selected as calculation feature points, and a feature point fitting relational expression is utilized.
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| JP4314403B2 (en) * | 2003-09-26 | 2009-08-19 | 株式会社日立プラントメカニクス | Soundness evaluation method and system for mechanical continuous unloader |
| DE102011004141A1 (en) * | 2010-09-02 | 2012-03-08 | Siemens Aktiengesellschaft | Method for controlling material flows, in particular in the form of bulk material and the like, and corresponding device |
| CN202116001U (en) * | 2011-04-29 | 2012-01-18 | 金义良 | Bulk conveying system |
| CN204453674U (en) * | 2015-01-12 | 2015-07-08 | 陕西远卓信息系统技术有限公司 | The many belt fortune coal flows of underground coal mine and belt speed comprehensive matching control system |
| CN206358804U (en) * | 2016-10-10 | 2017-07-28 | 中煤科工集团上海有限公司 | A kind of coal stream equalising control device |
| CN106882558B (en) * | 2017-03-31 | 2022-08-12 | 兖矿能源集团股份有限公司 | Belt speed regulating system and speed regulating method based on coal flow detection |
| CN107054911B (en) * | 2017-04-14 | 2019-10-11 | 西安热工研究院有限公司 | A kind of control system and method judged automatically and eliminate run coal bin chute blockage |
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