CN113148559A - Method for calculating holding pressure of telescopic oil cylinder of automatic conveyor chain tensioning system - Google Patents
Method for calculating holding pressure of telescopic oil cylinder of automatic conveyor chain tensioning system Download PDFInfo
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- CN113148559A CN113148559A CN202110342249.0A CN202110342249A CN113148559A CN 113148559 A CN113148559 A CN 113148559A CN 202110342249 A CN202110342249 A CN 202110342249A CN 113148559 A CN113148559 A CN 113148559A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 10
- 238000005065 mining Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010516 chain-walking reaction Methods 0.000 description 1
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- 230000002596 correlated effect Effects 0.000 description 1
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- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/44—Belt or chain tensioning arrangements
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/06—Transport of mined material at or adjacent to the working face
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drives For Endless Conveyors (AREA)
Abstract
The invention provides a method for calculating the holding pressure of a telescopic oil cylinder of an automatic tensioning system of a conveyor chain, which is characterized in that a current detection unit is installed on a tail motor of a conveyor, a pressure detection unit is installed in the telescopic oil cylinder at the tail, the current detection unit, the pressure detection unit, the tail motor, the telescopic oil cylinder and a hydraulic system are all connected to a main controller, no-load measurement is carried out to obtain a low-level current value and a pressure value, then full-load measurement is carried out to obtain a high-level current value and a high-level pressure value, then a theoretical value of the holding pressure is calculated through a formula, the holding pressure of the telescopic oil cylinder is controlled through comparison of an actual detection value and the theoretical value, the tensioning force of the chain is further adjusted, the service lives of the chain and a driving part are effectively prolonged, and energy conservation and consumption reduction are facilitated.
Description
Technical Field
The invention relates to the field of coal mine fully mechanized mining, in particular to a method for calculating holding pressure of a telescopic oil cylinder of an automatic tensioning system of a conveyor chain.
Background
The scraper conveyor of the underground fully mechanized coal mining face of the coal mine is core equipment for conveying coal materials, and is matched with a coal mining machine and a hydraulic support in a coordinated mode to complete a coal mining task of the fully mechanized coal mining face.
With the continuous development of intelligent, efficient and rapid mining technologies, the requirements of scraper conveyors on the aspects of intellectualization, conveying power, reliability, safety and the like are continuously improved. The chain is an important component of the scraper conveyor, and the motor drives the chain to drive the scraper to do reciprocating motion, so that the task of conveying coal materials is completed. The chain is an elastic object, can take place elastic deformation and plastic deformation after bearing coal charge weight, under different operating modes, shows the state of too loose or tension.
When the chain is too tight, the abrasion is intensified, and the chain breaking phenomenon can be induced; when the chain is too loose, phenomena of chain stacking, chain blocking and tooth jumping can be induced, and normal operation of equipment is influenced. Need regularly carry out artifical inspection, add the chain operation when the chain is too tight, subtract the chain operation when the chain is too loose, the trouble is wasted time and energy in the pit operation.
In order to avoid frequent chain adding and reducing ring operation, a plurality of conveyor manufacturers are additionally provided with telescopic tails, two sides of each telescopic tail are respectively provided with a plurality of telescopic oil cylinders, the length of a scraper is changed through the extension or contraction of the oil cylinders, and finally the purpose of adjusting the tightness of a chain is achieved.
For example, patent No. 201410147453.7, entitled automatic tensioning device for fully mechanized mining face and control method thereof, describes a method for controlling the tensioning of a chain by controlling the pressure of a tail actuator with the aid of a pressure monitoring device and a displacement monitoring device, but the method has the main problems that the pressure value of the tail actuator is preset, the load of a conveyor is continuously changed in the working process, the most appropriate tension is changed when the load is changed, the relevance of the method to the actual working condition is not high, and the pressure range can not be adjusted with the real-time working condition.
Also patent No. 201820225372.8, patent name: in the utility model discloses an in the automatic tow-cable electrical control device of coal-winning machine's utility model patent, also proposed and correlated with the technical scheme who carries out control through displacement sensor and pressure sensor, there is above-mentioned problem equally.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for calculating the holding pressure of a telescopic oil cylinder of an automatic conveyor chain tensioning system, which prolongs the service lives of a chain and a driving part, is favorable for energy conservation and consumption reduction and accurately adjusts the holding pressure.
In order to achieve the purpose, the invention adopts the technical scheme that: a current detection unit is installed on a tail motor of a conveyor, a pressure detection unit is installed in a telescopic oil cylinder of a tail, the current detection unit, the pressure detection unit, the tail motor, the telescopic oil cylinder and a hydraulic system are all connected to a main controller, and the pressure maintenance of the telescopic oil cylinder is controlled through the following methods:
and (3) no-load measurement: emptying the conveyor to make it idle, artificially extending the drive frame of the tail under the condition of idle running until observing that no loose chain is on the chain wheel of the tail, and then retracting the drive frame at the interval of m millimeters per step until observing that the chain is not slackA small amount of chain slack, when the current of the reading current detection unit is I0Pressure of the pressure detecting unit is P0；
Full load measurement: the conveyor is fully loaded, the pressure of the telescopic oil cylinder is adjusted at the pressure interval of nMPa of each step until a small amount of chain slack is observed, and the current I of the current detection unit is read at the moment1Pressure of the pressure detecting unit is P1；
Calculating the holding pressure:
in the carrying process, when the current detection unit detects that the obtained actual measurement current I is less than I0While maintaining pressure P = P0；
When the current detection unit detects the obtained actual measurement current I1≥I≥I0While maintaining the pressure P = (P)1-P0）/（I1-I0）*I+P0-I0（P1-P0）/（I1-I0）；
When the measured current I detected by the current detection unit is less than or equal to I1While maintaining pressure P = P1；
Adjusting the pressure of the telescopic oil cylinder: the main controller compares the actual pressure detected by the pressure detection unit with the calculated holding pressure, when the actual pressure is greater than the holding pressure, the main controller controls the telescopic oil cylinder to contract so that the chain is loosened, and when the actual pressure is less than the holding pressure, the main controller controls the telescopic oil cylinder to extend out so that the chain is tensioned;
wherein m and n are natural numbers greater than 0.
Basically, in the process of adjusting the pressure of the telescopic oil cylinder, the main controller controls the telescopic oil cylinder to act, so that the adjustment is stopped after the actual pressure is equal to the calculated pressure.
The value range of m is 10 < m < 50.
Wherein n is in the range of 0 < n < 5.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly, the invention monitors the current of the tail motor of the conveyor and the holding pressure of the tail telescopic oil cylinder in real time, the current of the tail motor reflects the current load state of the tail driving mechanism of the conveyor, the holding pressure of the tail telescopic oil cylinder reflects the tensioning state of the tail chain of the conveyor, the measured current value is utilized to calculate the most reasonable holding pressure of the telescopic oil cylinder, then whether the detected pressure of the telescopic oil cylinder is the same as the calculated reasonable holding pressure is judged, if the detected pressure is higher or lower than the calculated reasonable holding pressure value, the telescopic oil cylinder is controlled by the main controller to stretch to adjust the pressure of the oil cylinder, so that the oil cylinder is always in a reasonable pressure range, the conveyor chain always has the tension matched with the load, the situation that the chain is too tight or too loose is avoided, and the service lives of the chain and the driving part are greatly prolonged, and is beneficial to energy conservation and consumption reduction.
Drawings
FIG. 1 is a data relationship diagram of a calculation process of the holding pressure of the telescopic cylinder in the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
A method for calculating the holding pressure of a telescopic oil cylinder of an automatic tensioning system of a conveyor chain is an improvement based on the existing conveyor with the adjustable telescopic length of a tail, a current detection unit is installed on a tail motor of the conveyor, a pressure detection unit is installed in the telescopic oil cylinder of the tail, the tail motor is the only source of driving force for chain running, the telescopic oil cylinder of the tail is connected with a hydraulic system and is used for telescopic adjustment of the tail part, the current detection unit, the pressure detection unit, the tail motor, the telescopic oil cylinder and the hydraulic system are all connected to a main controller, and the pressure holding of the telescopic oil cylinder is controlled by the following method:
first, two extreme conditions of the conveyor, i.e., no-load operation and full-load operation, are set, and the conditions in the two states are measured respectively.
And (3) no-load measurement: emptying the conveyor to make it idle, in the case of idle operation, artificially extending the drive carriage of the tail until observing that there is no slack chain on the tail sprocket, then retracting the drive carriage at intervals of 25 mm per step until observing that a small amount of chain is slack, at which point the reading is takenThe current of the current detection unit is I0Pressure of the pressure detecting unit is P0；
In other embodiments, the drive carriage may be retracted at intervals of 10mm per step, or 50 mm.
Full load measurement: when the coal mining machine cuts a complete cutter and just conveys materials to a tail driving part, the conveyor can be considered to be fully loaded at the moment, the pressure of the telescopic oil cylinder is adjusted at the pressure interval of 1MPa in each step until a small amount of chains are observed to be loosened, and the current I of the current detection unit is read at the moment1Pressure of the pressure detecting unit is P1；
Calculating the holding pressure:
in the carrying process, when the current detection unit detects that the obtained actual measurement current I is less than I0While maintaining pressure P = P0；
When the current detection unit detects the obtained actual measurement current I1≥I≥I0While maintaining the pressure P = (P)1-P0）/（I1-I0）*I+P0-I0（P1-P0）/（I1-I0）；
When the measured current I detected by the current detection unit is less than or equal to I1While maintaining pressure P = P1；
For example, the current of the motor at the tail of the conveyor is measured to be 30A when the conveyor is unloaded, the pressure of the telescopic cylinder is 6.5MPa, the current of the motor at the tail of the conveyor is measured to be 90A when the conveyor is fully loaded, the pressure of the telescopic cylinder is 10MPa, and when the measured current is 60A, the reasonable holding pressure can be calculated to be 8.25 MPa.
Adjusting the pressure of the telescopic oil cylinder: the main controller compares the actual pressure detected by the pressure detection unit with the calculated holding pressure, when the actual pressure is greater than the holding pressure, the main controller controls the telescopic oil cylinder to contract so that the chain is loosened, and when the actual pressure is less than the holding pressure, the main controller controls the telescopic oil cylinder to extend out so that the chain is tensioned;
wherein m and n are natural numbers greater than 0.
In the optimal implementation scheme, in the process of adjusting the pressure of the telescopic oil cylinder, the main controller controls the telescopic oil cylinder to act, so that the adjustment is stopped after the actual pressure is equal to the calculated pressure, the tension force of the chain is controlled at a reasonable level all the time, the working requirement can be met, and meanwhile, the chain is prevented from being too loose or too tight.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. A method for calculating the holding pressure of a telescopic oil cylinder of an automatic conveyor chain tensioning system is characterized by comprising the following steps of: the method comprises the following steps that a current detection unit is installed on a tail motor of the conveyor, a pressure detection unit is installed in a telescopic oil cylinder of the tail, the current detection unit, the pressure detection unit, the tail motor, the telescopic oil cylinder and a hydraulic system are all connected to a main controller, and the pressure maintenance of the telescopic oil cylinder is controlled through the following method:
and (3) no-load measurement: emptying the conveyor to enable the conveyor to be unloaded, artificially extending the drive frame of the tail under the condition of no-load operation until observing that no chain on a chain wheel of the tail is loosened, then retracting the drive frame at an interval of m millimeters per step until a small amount of chain is loosened, and reading the current of the current detection unit to be I at the moment0Pressure of the pressure detecting unit is P0；
Full load measurement: the conveyor is fully loaded, the pressure of the telescopic oil cylinder is adjusted at the pressure interval of nMPa of each step until a small amount of chain slack is observed, and the current I of the current detection unit is read at the moment1Pressure of the pressure detecting unit is P1；
Calculating the holding pressure:
in the carrying process, when the current detection unit detects that the obtained actual measurement current I is less than I0While maintaining pressure P = P0；
When the current detection unit detects the obtained measured electricityStream I1≥I≥I0While maintaining the pressure P = (P)1-P0）/（I1-I0）*I+P0-I0（P1-P0）/（I1-I0）；
When the measured current I detected by the current detection unit is less than or equal to I1While maintaining pressure P = P1；
Adjusting the pressure of the telescopic oil cylinder: the main controller compares the actual pressure detected by the pressure detection unit with the calculated holding pressure, when the actual pressure is greater than the holding pressure, the main controller controls the telescopic oil cylinder to contract so that the chain is loosened, and when the actual pressure is less than the holding pressure, the main controller controls the telescopic oil cylinder to extend out so that the chain is tensioned;
wherein m and n are natural numbers greater than 0.
2. The method for calculating the holding pressure of the telescopic cylinder of the automatic conveyor chain tensioning system according to claim 1, wherein: in the process of adjusting the pressure of the telescopic oil cylinder, the main controller controls the telescopic oil cylinder to act, so that the adjustment is stopped after the actual pressure is equal to the calculated pressure.
3. The method for calculating the holding pressure of the telescopic cylinder of the automatic conveyor chain tensioning system according to claim 1 or 2, wherein: the value range of m is 10 < m < 50.
4. The method for calculating the holding pressure of the telescopic cylinder of the automatic conveyor chain tensioning system according to claim 3, wherein: the value range of n is 0 < n < 5.
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| CN202110342249.0A CN113148559A (en) | 2021-03-30 | 2021-03-30 | Method for calculating holding pressure of telescopic oil cylinder of automatic conveyor chain tensioning system |
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| CN202110342249.0A CN113148559A (en) | 2021-03-30 | 2021-03-30 | Method for calculating holding pressure of telescopic oil cylinder of automatic conveyor chain tensioning system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641058A (en) * | 1994-04-16 | 1997-06-24 | Westfalia Becorit Industrietechnik Gmbh | Method and a device for tensioning endless drive belts |
| GB2346663A (en) * | 1999-02-12 | 2000-08-16 | Dbt Autom Gmbh | Belt or chain tensioner |
| CN204642958U (en) * | 2015-04-29 | 2015-09-16 | 连云港天明装备有限公司 | A kind of fully-mechanized mining working surface transport plane tail tensioning device |
| CN205441742U (en) * | 2015-12-21 | 2016-08-10 | 中国神华能源股份有限公司 | Tail tension system of double -stranded scratch board conveyor |
| WO2017206279A1 (en) * | 2016-05-31 | 2017-12-07 | 山东科技大学 | Chain tension regulating device used for tail of scraper and use thereof |
| CN110466955A (en) * | 2019-08-12 | 2019-11-19 | 青岛中加特变频电机有限公司 | A kind of scratch board conveyor tensioning control method and control device |
-
2021
- 2021-03-30 CN CN202110342249.0A patent/CN113148559A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641058A (en) * | 1994-04-16 | 1997-06-24 | Westfalia Becorit Industrietechnik Gmbh | Method and a device for tensioning endless drive belts |
| GB2346663A (en) * | 1999-02-12 | 2000-08-16 | Dbt Autom Gmbh | Belt or chain tensioner |
| CN204642958U (en) * | 2015-04-29 | 2015-09-16 | 连云港天明装备有限公司 | A kind of fully-mechanized mining working surface transport plane tail tensioning device |
| CN205441742U (en) * | 2015-12-21 | 2016-08-10 | 中国神华能源股份有限公司 | Tail tension system of double -stranded scratch board conveyor |
| WO2017206279A1 (en) * | 2016-05-31 | 2017-12-07 | 山东科技大学 | Chain tension regulating device used for tail of scraper and use thereof |
| CN110466955A (en) * | 2019-08-12 | 2019-11-19 | 青岛中加特变频电机有限公司 | A kind of scratch board conveyor tensioning control method and control device |
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Effective date of registration: 20220908 Address after: 450016 No. 167, 9th Street, Zhengzhou area (Economic Development Zone), Henan pilot Free Trade Zone, Zhengzhou City, Henan Province Applicant after: HYDRAULIC & ELECTRIC CONTROL EQUIPMENT CO LTD ZHENGZHOU COAL MINING MACHINERY GROUP Co.,Ltd. Address before: No.167, 9th Street, Zhengzhou Economic and Technological Development Zone, Henan Province, 450000 Applicant before: ZHENGZHOU COAL MINING MACHINERY GROUP Co.,Ltd. |
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Application publication date: 20210723 |