180度彎曲皮帶輸送機設(shè)計【含11張CAD圖紙、說明書】
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程序工程26（2011）942-946
第一屆國際礦山安全科學(xué)與工程研討會
帶式輸送機的典型故障分析和處理
趙麗華 尹林
東北電力大學(xué)機械工程學(xué)院，吉林省吉林市長春路169,132012，中國
摘要
分析了帶式輸送機滾筒和輸送機的兩種典型故障形式，介紹了防止和消除故障的維護方法，以保證帶式輸送機的正常運行。
?2011由Elsevier Ltd.出版CC BY-NC-ND許可證。
中國安全科學(xué)技術(shù)研究院，中國礦業(yè)大學(xué)（北京），麥吉爾大學(xué)和臥龍崗大學(xué)負(fù)責(zé)的選擇和/或同行評議。
關(guān)鍵詞：皮帶機；輸送機偏差；滾筒；典型的失敗
1 介紹
帶式輸送機是連續(xù)運輸?shù)某Ｓ迷O(shè)備，具有效率高，輸送量大，施工簡單，維護量小的優(yōu)點。 可以實現(xiàn)不同的距離，不同的物料輸送。 廣泛應(yīng)用于火電廠的采礦，輸煤系統(tǒng)等工程。 本文在研究皮帶輸送機使用過程中常見的典型故障，分析故障原因的基礎(chǔ)上，提出了一些有效的解決方法。
2 傳送帶的典型故障
2.1 輸送帶偏差
在帶式輸送機中，由于輸送帶是牽引部件，傳遞動力和運動，也是承載組件，支撐物料的負(fù)載。工作比較復(fù)雜，所以在工作中經(jīng)常會發(fā)生皮帶偏差。偏差是運行中的傳送帶，傳送帶的中心線偏離傳送帶的中心線。由于輸送帶偏差可能會導(dǎo)致輸送帶邊緣和機架磨損，導(dǎo)致皮帶邊緣過早損壞，測距影響輸送機的使用壽命，影響物料輸送量，重量是由退料造成的，甚至發(fā)生
\趙麗華，電話：+ 0086-432-64822626；傳真：+ 0086-432-64666020。
電子郵件：zhaolh2008@yahoo.cn。1877-7058?2011 Elsevier Ltd.出版開放獲取下CC BY-NC-ND許可證。
DOI：10.1016 / j.proeng.2011.11.226
Lihua ZHAO and Yin LIN / Procedia Engineering 26 (2011) 942 – 946
945
停機現(xiàn)象，直接影響生產(chǎn)。由于傳送帶更重要，最昂貴的部件。其價格約為傳送帶的25％~50％。因此分析帶偏差的原因，減少和消除帶偏差，是保證帶工作，延長設(shè)備使用壽命的重要環(huán)節(jié)。由于以下因素導(dǎo)致皮帶出現(xiàn)偏差。
2.1.1 在設(shè)備本身
a.機架剛性差，負(fù)載變形大，造成皮帶偏差。
b.滾筒外圓柱面誤差較大，導(dǎo)致傳送帶運行時產(chǎn)生偏差。
c.支撐輥旋轉(zhuǎn)不靈活，導(dǎo)致傳送帶兩側(cè)受力不均勻，導(dǎo)致傳送帶偏離。
d.平行度誤差圓柱軸和滾軸軸過大，導(dǎo)致傳送帶偏離。
e.輸送帶本身質(zhì)量有問題，薄而厚不均勻，導(dǎo)致輸送帶跑偏導(dǎo)致沖擊導(dǎo)致輸送帶偏離。
f.輸送帶制造質(zhì)量有缺陷，輸送帶兩側(cè)邊緣長度不一致，導(dǎo)致輸送帶跑偏。
g.不與帶連接器平行，連接誤差過大，導(dǎo)致帶偏差。
2.1.2 安裝調(diào)整
a.驅(qū)動，換輥軸與輸送機中心線垂直誤差過大，使輸送機與水平線傾斜度較大，造成皮帶偏差。
b.輥軸與輸送機中心線的垂直誤差很大，也會造成帶偏差。
c.機架與地面的連接強度不夠，機架不穩(wěn)定，造成帶偏差。
d.排料槽的喂料盤位置不當(dāng)，傳送帶兩側(cè)的不平衡力會造成傳送帶偏差。
2.1.3 隨著維護
a.清掃機清掃性能差，使?jié)L筒圓柱直徑局部增大。
b.喂料口位置錯誤，使物料在輸送帶上部分負(fù)載，造成皮帶偏差。
c.維護不善和調(diào)整不當(dāng)，導(dǎo)致傳送帶偏差。
d.對于鋼絲簾布帶，由于鋼絲簾線的制造是力量不均勻，所以在操作中發(fā)生偏差，或者帶差較大，負(fù)載下的伸長率大，造成振動時，帶會產(chǎn)生偏差。
e.另外，運行中的傳送帶系統(tǒng)的振動會導(dǎo)致偏差。
f.另外，在輸送一些粘性物質(zhì)時，使輥子等粘合材料，使輥部分的圓柱直徑增大，造成帶偏差。
2.2 防止皮帶偏離的措施
2.2.1 由于設(shè)備在制造輸送帶時產(chǎn)生偏差，主要通過改進(jìn)設(shè)計，制造精度來防止和減少輸送帶偏差的發(fā)生。
2.2.2 對于安裝調(diào)整不當(dāng)和日常使用造成偏差，主要應(yīng)考慮以下幾個方面：
:
輸送帶在驅(qū)動輥或后輥上產(chǎn)生偏差時，通常通過調(diào)整輥軸承的位置來消除軸承的位置，通常通過調(diào)整輥軸承的位置來消除軸承的方式。
a.輥子旋轉(zhuǎn)軸與輸送機的縱向中心線不垂直，導(dǎo)致輸送帶一側(cè)松動，另一側(cè)緊，帶從緊側(cè)移向松散側(cè)，發(fā)生偏差現(xiàn)象。應(yīng)調(diào)整緊固偏差側(cè)的軸承位置。使帶的橫向拉力相等，消除偏差。 當(dāng)尾輪螺旋張緊時，尾部偏差的原因可能是由于張緊裝置的頂端緊張力兩端螺桿不相等造成的不平衡。
b.氣缸軸線不是水平的，兩端軸承的高度差是導(dǎo)致頭部或尾部偏差的另一個原因。此時，滾筒軸承兩端應(yīng)加減墊片的方式平整滾筒軸線，以消除傳送帶偏差。
c.滾筒表面附著材料，相當(dāng)于增加滾筒局部直徑，會造成傳送帶偏差，應(yīng)加強傳送帶的空段清洗，以減少傳送帶上的粘合材料或灰塵積聚。另外，輸送帶之間的鼻子和尾部之間的偏差稱為中心或局部偏差。這種偏差的原因比較復(fù)雜，它與傳送帶沿設(shè)備暴露的關(guān)系。需要針對具體問題進(jìn)行詳細(xì)分析。 使用以下方法可以解決這些問題。
A.負(fù)載或空載分支輥軸與輸送帶運行中心線不垂直，導(dǎo)致膠輥偏離輥子。 偏差結(jié)束時應(yīng)調(diào)整傳送帶的運行方向。 此時往往需要調(diào)整相鄰組的滾筒以達(dá)到消除偏差的目的，調(diào)整偏差角度不宜過大。
B.輸送帶接頭與膠帶中心線（喇叭）不垂直，造成偏差，應(yīng)改善安裝連接精度以消除偏差。
C.如果裝在傳送帶上的物料是直的， 使沿著帶寬方向分布的材料塊和重量分布嚴(yán)重不等，造成偏差，通過調(diào)整消隱管和裙板的定位方法予以消除。
D.近來有人提出，由于制造成本高，一些技術(shù)問題沒有得到很好解決，用于轉(zhuǎn)移部分輸送帶的涂布方法使得該方法很難促進(jìn)使用。
3 滾筒的典型故障
3.1 操作不靈活
每個皮帶輸送機都有批號滾筒，安裝如圖1所示，其工作狀態(tài)直接影響輸送機正在工作。 根據(jù)輸送機的實際工作情況，輸送機系統(tǒng)中的滾筒可根據(jù)其效果，槽式滾筒，平行滾筒，緩沖滾筒和自調(diào)整滾筒分為四類，根據(jù)載荷情況可分為兩種，即空載滾子和軸承滾子。槽式滾筒使用軸承材料的分支，起到輔助作用和增加吞吐量的作用。
平行滾筒為長形滾筒，用于輸送機的空載分支，起到無負(fù)載分支膠帶的支撐作用；緩沖輥也是槽輥。柔性支撐槽輥安裝在輸送機負(fù)載分支上，安裝在物料處。減少傳送帶材料的影響，保護膠帶和支撐軸承。一般基于彈性支撐分為橡膠圈和彈簧板；自調(diào)心輥的作用是對輸送帶的偏差進(jìn)行一定程度的自動調(diào)整，避免皮帶過度磨損和散落的物料。在負(fù)載和空載分支都配備了一些自調(diào)心滾子。圖2所示的自對準(zhǔn)原理。
帶
帶
球面滾子軸
O
滾子軸承 產(chǎn)品 Vtape移動方向
圖1 安裝示意圖 圖2 調(diào)整心臟原理
滾筒的制造安裝質(zhì)量直接影響傳送帶的使用壽命和運行阻力。滾筒維修和更換成本也是輸送帶運營費用的重要組成部分。運行阻力，耗電量，滾筒和皮帶壽命，維護工作量和運輸成本對輸送機滾筒運行質(zhì)量有重要影響。因此，延長滾筒使用壽命的分析方法，也是保證帶式輸送機穩(wěn)定運行的重要內(nèi)容，具有工程實際意義。帶式輸送機系統(tǒng)的槽式滾筒用于物料支承分支，起到輔助作用和增加吞吐量的作用。平行滾筒為長形滾筒，用于輸送機的無支架，起到空載分支膠帶的支撐作用；緩沖輥也是槽輥。柔性支撐槽輥安裝在輸送機負(fù)載分支上，安裝在物料處。
減少傳送帶材料的影響，保護膠帶和支撐軸承。自調(diào)整輥的作用是對輸送帶偏差進(jìn)行一定程度的自動調(diào)整，避免皮帶和物料過度磨損而散落。在裝載和空載分支都配備了許多自調(diào)整輥。 如果滾筒出現(xiàn)轉(zhuǎn)動不靈活或不轉(zhuǎn)動的現(xiàn)象。通過滾動成滑動的輥操作的阻力系數(shù)為10倍增加。 結(jié)果將導(dǎo)致帶式輸送機的運行阻力增加，電力消耗增加。由于滾筒旋轉(zhuǎn)不靈活，滾筒與傳送帶之間的摩擦通過滾動摩擦變?yōu)榛瑒幽Σ?，使兩者之間的摩擦增大，縮短了設(shè)備的使用壽命。 因此，我們必須經(jīng)常更換大量的托輥，輸送帶，導(dǎo)致設(shè)備維護量增加，運行成本增加。
影響滾筒靈活性和壽命的因素很多，總結(jié)如下：
a．滾筒的制造質(zhì)量
輥子制造中存在的主要問題是軸承剛度不足，難以保證輥子組裝精度，從而制約輥子運轉(zhuǎn)的靈活性。
b．密封潤滑和使用維護
影響輥子旋轉(zhuǎn)不靈活的主要因素包括密封和軸承潤滑問題。由于皮帶的工作環(huán)境更加嚴(yán)峻。一般來說，使用現(xiàn)場的灰塵很大。軸承的密封形式對輥子的運行靈活性有很大的影響。 如果密封不好，污垢容易進(jìn)入軸承，導(dǎo)致輥子轉(zhuǎn)動不靈活，另外，如果使用一般的鈣基潤滑脂，軸承潤滑脂容易變色變干，不能起到很好的潤滑作用。
3.2 解決方案
a．在滾筒制造過程中保證精度要求，例如壓軸承內(nèi)徑達(dá)到三級精度，管子兩端的尺寸公差，同心度和橢圓度必須符合國家標(biāo)準(zhǔn)。產(chǎn)品有嚴(yán)格的質(zhì)量檢驗，確保所有產(chǎn)品合格。
b．密封潤滑，除了制造質(zhì)量保證外，還要配合良好的潤滑材料，如使用鋰基潤滑脂，可以提高軸承的潤滑性，延長滾子的使用壽命是必要的。
c．軸承采用球軸承支承，塑料密封圈采用迷宮式密封結(jié)構(gòu)，這樣可以保證輥筒工作合理的力，同時保證防塵效果好，阻力小，裝拆方便，易于維護，降低輸送機運行成本。
4 結(jié)論
帶式輸送機的應(yīng)用范圍廣泛，而且工作環(huán)境一般比較困難，使設(shè)備運行在良好的工作狀態(tài)，延長設(shè)備使用壽命，提高運行質(zhì)量，降低運行成本一直是工程技術(shù)人員的目標(biāo)。分析和解決影響正常運行的主要問題，確保設(shè)備的良好運行，是設(shè)備維護的一項重要工作。本文分析了所提出的方法。有用提高網(wǎng)站維護人員水平，解決實際問題，對于實際項目具有重要意義。
參考
[1]義香郎.火力發(fā)電廠的運輸機械設(shè)備[M].東北電力大學(xué)圖書,1998,08.
[2]趙麗華.火電廠輸煤系統(tǒng)的運行和維護[J].煤礦機械,2011,No.02.
[3]李麗華.帶式輸送機典型故障分析與處理[J].傳動與控制,2003年第10期.
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Procedia Engineering 26 (2011) 942 9461877-7058 2011 Published by Elsevier Ltd.doi:10.1016/j.proeng.2011.11.2260Available online at First International Symposium on Mine Safety Science and EngineeringTypical failure analysis and processing of belt conveyorLihua ZHAOSchool of Mechanical Engineering, Northeast Dianli University, Jilin City, Jilin Province Changchun Road 169,132012,China,Yin LINAbstractThe paper analyzes two typical failure forms of roller and conveyor at the belt conveyor, and describes the maintenance methods of prevention and elimination failures to ensure the normal operation of belt conveyor.Keywords: belt conveyor; conveyor deviation;roller; typical failure.1. Introduction Belt conveyor is a commonly used equipment of continuous transport, it has a high efficiency andlarge conveying capacity, simpler construction,small amount of maintenance. Can be achieved at different distances, different materials transportation. It iss widely used in mining, coal handling system in thermal power plant and other projects. Belt conveyor will often occur some typical problems in the course,this paper Based on research common typical failure of belt conveyor during use,analysis the cause offailure,proposed some effective methods to solve the problem.2. Typical faults of conveyor belt2.1. Conveyor belt deviationIn the belt conveyor, as the conveyor belt is traction components, transmit power and motion, also is carrying components, support material load. Working more complex, so at work often happen belt deviation. Deviation is the conveyor belt during operation, the center line of belt deviation the center line of conveyor. As the conveyor belt deviation may cause between the belt edge and rack wear, cause belt Lihua ZHAO. Tel: +0086-432-64822626; fax: +0086-432-64666020. Email: Open access under CC BY-NC-ND license. 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of China Academy of Safety Science and Technology, China University of Mining and Technology(Beijing), McGill University and University of Wollongong. Open access under CC BY-NC-ND license.943Lihua ZHAO and Yin LIN / Procedia Engineering 26 (2011) 942 946edge premature damage, Ranging impact the life of conveyors, affect the throughput of materials, Weight is caused by withdrawal material, even happen stop occurrence, direct impact on production. As the conveyor belt is more important, the most expensive parts. Its price about 25%50% to the conveyor. So analysis the reasons of belt deviation, reduce and eliminate belt deviation, It is an important part of ensure belt to work, extend equipment life. Cause the belt occurs deviation because of the following factors.2.1.1. In the device itselfa. Rack rigid is poor, large deformation under load, causing the belt deviation.b. The larger error of roller outer cylindrical, caused deviation when the conveyor belt running.c. The supporting roller rotation is not flexible, causes the conveyor belt both sides stress to be uneven, causes the conveyor belt deviation.d. The parallelism error cylindrical axis and roller axis is too big, causes the conveyor belt deviation.e. Conveyor belt itself is questionable quality, thin and thick uneven, caused a shock lead running conveyor belt deviation.f. Conveyor belt manufacturing quality have defects, the length of belt both sides edge is inconsistent,cause running conveyor belt deviation.g. Not parallel with belt connector, connection error is too big, cause belt deviation.2.1.2. Installation adjustmenta. Drive, change roller axis and conveyor centerline vertical error is too big, make conveyor and horizontal line have a bigr inclination, cause belt deviation.b. Roller axis and conveyor centerline vertical error is big, will cause belt deviation also.c. The connection strength between rack and ground is not enough, the rack unstable, causing belt deviation.d. The feeding plate of discharge trough and improperly located, both sides of the conveyor belt uneven force cause belt deviation.2.1.3. With maintenancea. The cleaning performance of sweeper is poor, make the roller cylindrical diameter local increases.b. Feeding mouth location is wrong, so that the material partial load on the conveyor belt, cause belt deviation.c. Poor maintenance and improper adjustment, resulting in the conveyor belt deviation.d. For the steel cord belt, as the manufacture of steel cord is uneven force, so that a deviation occurs in the operation, or a strong difference of belt, large elongation under load, causing the vibration, the belt will deviation.e. Also, the vibration of running conveyor belt system can cause the deviation.f. In addition, when conveying some viscous material, make the roller, etc. bonding materials, make the cylindrical diameter of roller part increases, causing belt deviation.2.2. Measures to prevent the belt deviation2.2.1. Due to equipment in the manufacture of conveyor belt causes the deviation, primarily through improved design, manufacture precision to prevent and reduce the occurrence of conveyor belt deviation.2.2.2. For installation adjust improper and daily use causes deviation, mainly the following aspects should be considered:944 Lihua ZHAO and Yin LIN / Procedia Engineering 26 (2011) 942 946Conveyor belt in drive roller or on rear rollers deviation, usually by adjusting the position of the roller bearing ways to eliminate, usually by adjusting the position of the roller bearing ways to eliminate.a.The longitudinal centerline of the roller rotation axis and conveyor is not perpendicular, resulting in the conveyor belt one side loose and the other tight, belt move from the tight side to the loose side, Occurs deviation phenomenon. Should be adjusted bearing position of the tighten deviation side. Make horizontal pull of belt equal, eliminate deviation. When tail roller is spiral tensioning,the reasons of tail deviation may be due to the top tight power of tensioning device both sides screw rod are not equal, resulting in caused by imbalance.b. Cylinder axis is not horizontal, at both ends bearing of the height difference is cause another reason of head or tail deviation. At this point, at both ends roller bearing should add and subtract shims way to leveling roller axis ,to eliminate conveyor belt deviation.c. Roller surface adhesion material, equivalent to increasing the roller local rdiameter, will cause the conveyor belt deviation, should strengthen empty segment cleaning of conveyor belt to reduce the adhesive material or dust accumulation on the conveyor belt. In addition, the conveyor belt between the nose and tail parts deviation, called central or local deviation. Such deviation reasons is more complex, it is with the conveyor belt along device exposure to a relationship. Need a detailed analysis for specific issues. Using the following methods can resolve these issues.A. Load or no-load branch roller axis with the conveyor belt running centerline is not perpendicular, causing tape at the roller deviation. Deviation ends should adjustment to the conveyor belt running direction. At this time often need to adjust the adjacent groups of rollers in order to achieve the purpose of eliminating deviation, adjusting deviation angle should not be too big.B. Conveyor belt joint with the tape centerline (trumpet) is not perpendicular, to cause the deviation, Should improved installation connection accuracy to eliminate deviation.C. If material loaded on the conveyor belt is straight; make the material block and weight distribution along bandwidth direction distribution serious inequality, cause deviation, through adjustment blanking tube and skirt plate location method to be eliminated.D. Recently, it was suggested that the method of application film for transfer partial conveyor belt, because of high manufacturing costs and some technical problems not well solved, makes this method very difficult to promote the use.3. The typical failure of roller3.1. Operation is not flexibleEach belt conveyor have lot number rollers, installation shown in Picture 1, their work status directly affects the conveyor is working. According to the actual work of conveyor, roller in the conveyor system can be classified four kinds according their efect, trough roller, parallel roller, buffer roller and self-aligning roller; according to the loads case can be divided two kinds, no-load roller and bearing roller. Trough roller use bearing branches of materials, play a supporting role and increased throughput role.Parallel roller is a long-shaped roller, for no-load branch of conveyor, to play a supporting role of no-load branch tape; buffer roller is trough roller too. Flexible support trough roller be installed on conveyor load branch, Installed in the material office. Reduce the impact of material for conveyor belt, protect the tape and support bearing. Generally based on the elastic support were divided into rubber ring and spring plate; the role of self-aligning roller is a certain degree of automatic adjustment of conveyor belt deviation, To avoid excessive wear of belt and materials scattered. In the load and no-load branch are equipped with a number of self-aligning roller. The self-aligning principle shown in Fig. 2.945Lihua ZHAO and Yin LIN / Procedia Engineering 26 (2011) 942 946Roller bearingGoods Vtape movement Direction belt belt Spherical roller ax OFig.1. Installs the schematic drawing Fig. 2. Adjusts the heart principleManufacture installation quality of roller directly affect the life and running resistance of conveyor belt. roller repair and replacement costs are also an important part of conveyor belt operating expenses. The roller operation quality for conveyor of the running resistance, power consumption, roller and belt life, maintenance workload and cost of transportation has a significant impact. Therefore, analysis method to extend the service life of rollers, also an important contents to ensure stable operation of belt conveyor, practical significance in engineering. Trough roller of belt conveyor systems used on material bearing branch, play supporting role and increased throughput role. Parallel roller is a long-shaped roller, for no-load branch of conveyor, to play a supporting role of no-load branch tape; buffer roller is trough roller too. Flexible support trough roller be installed on conveyor load branch, Installed in the material office. Reduce the impact of material for conveyor belt, protect the tape and support bearing. The role of self-aligning roller is a certain degree of automatic adjustment of conveyor belt deviation, To avoid excessive wear of belt and materials scattered. In the load and no-load branch are equipped with a number of self-aligning roller. If roller appear rotating not flexible or not turning phenomenon. The drag coefficient of roller operation by rolling into a slide, value was ten times to increase. The results will result in increased running resistance of belt conveyors, electric power consumption increases. As the roller rotation is not flexible, the friction between roller and conveyor belt by rolling friction into sliding friction, make the friction increase between the two, shorten the equipment life . Therefore, we must often replace a large number of idlers, conveyor belt, resulting in increased equipment maintenance, operating costs increased.Many factors for affect the flexibility of running rollers and life span, summarized in the following areas:a.Manufacturing quality of rollerRoller manufacturing problems mainly in the bearing stiffness is not enough, it is difficult to ensure precision of roller assembly, thereby constraining the flexibility of running roller.b.Sealed lubrication and the use of maintenanceMain factors of affect roller rotation not flexible include sealing and bearing lubrication problem. As the work environment of belt is more severe. Generally speaking, the dust are great on used site. The seal form of bearing have a great influence on the running flexibility for rollers. If sealed not well, Dirt is easy into bearing to cause the roller rotation is not flexible, In addition, bearing grease if using the general calcium base grease is easy to change color to dry, can not play a very good lubricant role.946 Lihua ZHAO and Yin LIN / Procedia Engineering 26 (2011) 942 9463.2. Solutionsa. In the roller manufacturing processes guarantee the accuracy requirements, For example, pressing bearing bore to achieve three precision, tube at both ends of dimensional tolerances, concentricity and ovality must meet national standards. The products have strict quality inspection to ensure that all products qualified.b.Sealed lubrication, in addition to manufacturing quality assurance, go with good lubricating materials, such as use of lithium-based grease, can improve the lubrication of bearings which extend the life of the roller is necessary.c.Bearing used to ball bearings support, plastic sealing ring labyrinth seal structure, this can ensure roller worked reasonable force, While ensuring dust effect good, resistance small, easy assembly and disassembly, easy to maintain, reduce conveyor operating costs.4. ConclusionWide range applications of belt conveyors, and the work environment is generally more difficult, to keep equipment running in good working condition, extend equipment life, improve the quality of operation, reduce operating costs has been the goal of engineering and technical personnel. Analyze and resolve the impact normal operation of the main problems, to ensure the good functioning of device, it is an important work of equipment maintenance. This paper analyzes the proposed method. Helpful improve site maintenance staff levels to solve practical problems, for practical project has important significance.References1yixiang Lang. Transportation machinery equipment in thermal power plant.MNortheast dianli university book; 1998.08.2lihua Zhao. Operation and Maintenance of Coal Handling System in Thermal Power Plant, J.Colliery Machine;2011,NO. 02.3lihua Zhao. Typical failure analysis and processing of belt conveyorJ.Hoisting and Conveying Machinery;2003,NO 10.4lihua Zhao. The adjustment method of conveyor belt deviation J. Colliery Machine. 2001. No.05.
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