LS250螺旋輸送機(jī)的設(shè)計(jì)含開題及9張CAD圖
LS250螺旋輸送機(jī)的設(shè)計(jì)含開題及9張CAD圖,ls250,螺旋,輸送,設(shè)計(jì),開題,cad
帶式輸送機(jī)保護(hù)系統(tǒng)的研究
帶式輸送機(jī)作為一種連續(xù)運(yùn)輸機(jī)械，被廣泛應(yīng)用在煤炭、冶
金糧食等領(lǐng)域。
但是，帶式輸送機(jī)的故障一直困擾著其安全、可靠的運(yùn)行.
特別在礦井生產(chǎn)中，一旦發(fā)生故障，其將直接影響礦井生產(chǎn)，甚至造成人身傷亡。因此，確保帶式輸送機(jī)安全、可靠的運(yùn)行，對(duì)礦井的生產(chǎn)安全具有重要意義。本文選用鋼繩芯帶式輸送機(jī)作為研究對(duì)象，通過分析其存在的故障，從三個(gè)方面對(duì)其進(jìn)行研究，即接頭斷裂及張力超限、縱向撕帶、帶式輸送機(jī)火災(zāi)。通過對(duì)其發(fā)生的故障進(jìn)行分析，探究故障發(fā)生的機(jī)理，然后選用可行的監(jiān)測(cè)方法對(duì)其進(jìn)行監(jiān)測(cè)和預(yù)防。
本文采用嵌入式系統(tǒng)來設(shè)計(jì)帶式輸送機(jī)保護(hù)系統(tǒng)，選用基AR核心的S3C2410 作為保護(hù)系統(tǒng)的控制中心，選用嵌入式 Linux 作為系統(tǒng)的軟件開發(fā)平臺(tái)。在硬件設(shè)計(jì)方面，根據(jù)系統(tǒng)需要圍繞 S3C2410 來構(gòu)建硬件平臺(tái)。對(duì)于軟件部分，詳細(xì)介紹了一般驅(qū)動(dòng)程序的設(shè)計(jì)方法和步驟，并根據(jù)硬件及嵌入式Linux系統(tǒng)需要，完成了 CAN 總線、LCD、A/D 等驅(qū)動(dòng)程序設(shè)計(jì)。
最后，針對(duì)論文設(shè)計(jì)的硬件和驅(qū)動(dòng)程序，進(jìn)行了應(yīng)用程序的開發(fā)和程序的調(diào)試
帶式輸送機(jī)是現(xiàn)代散狀物料連續(xù)運(yùn)輸?shù)闹饕O(shè)備，被廣泛應(yīng)用在煤炭、冶金、電力、化工、礦山、港口、建材、糧食等領(lǐng)域，在國(guó)民經(jīng)濟(jì)中發(fā)揮著重要作用。然而，帶式輸送機(jī)作為一種連續(xù)運(yùn)輸機(jī)械，特別在礦井生產(chǎn)中，一旦發(fā)生故障，將直接影響生產(chǎn)，甚至造成人身傷亡。因此，確保其安全，可靠地運(yùn)轉(zhuǎn)對(duì)礦井的安全生產(chǎn)具有重要意義。
對(duì)于礦用鋼繩芯帶式輸送機(jī)來說，其單機(jī)工作長(zhǎng)度較長(zhǎng)，除要解決一般帶式輸送機(jī)共有的滾筒打滑、膠帶跑偏、托輥壽命低等問題外，有效地預(yù)防和避免接頭斷裂、縱向撕帶、膠帶機(jī)火災(zāi)等重大事故發(fā)生顯得十分重要。對(duì)于跑偏和滾筒打滑等故障的監(jiān)測(cè)技術(shù)已十分成熟，并已獲得廣泛應(yīng)用。而對(duì)于斷帶、撕帶、火災(zāi)等重大事故的實(shí)時(shí)監(jiān)測(cè)問題卻一直沒有得到很好的解決，先后出現(xiàn)了不少監(jiān)測(cè)方法和技術(shù)，但都存在著不同程度的問題。本文將著重介紹目前國(guó)內(nèi)外曾出現(xiàn)的。
針對(duì)鋼繩芯帶式輸送機(jī)斷帶、撕帶、火災(zāi)等重大事故的各類監(jiān)測(cè)方法和技術(shù)，然后提出一種實(shí)時(shí)監(jiān)測(cè)與保護(hù)系統(tǒng)，并且完成相應(yīng)的硬件和驅(qū)動(dòng)程序設(shè)計(jì)。歷經(jīng)近兩個(gè)世紀(jì)的發(fā)展，帶式輸送機(jī)的技術(shù)已經(jīng)發(fā)生了翻天覆地的變化。從采用天然材料的輸送帶到如今采用高強(qiáng)度人造合成材料，從短距離，低速到現(xiàn)在的長(zhǎng)距離、高速，在新技術(shù)的推動(dòng)下，帶式輸送機(jī)的性能正在不斷地提高。
對(duì)于帶式輸送機(jī)的技術(shù)來說，國(guó)外一直處于領(lǐng)先水平，主要體現(xiàn)在以下兩個(gè)方面：一方面，在本身的技術(shù)和裝備方面有了巨大的發(fā)展，如大運(yùn)量、高運(yùn)速、長(zhǎng)距離等大型帶式輸送機(jī)已成為其主要的研究和發(fā)展方向；另一方面，帶式輸送機(jī)的多元化、應(yīng)用范圍的擴(kuò)大化也取得了長(zhǎng)足的發(fā)展，如大傾角帶式輸送機(jī)機(jī)、平面或空間轉(zhuǎn)彎帶式輸送機(jī)、管狀帶式輸送機(jī)等各種機(jī)型。另外，國(guó)外帶式輸送機(jī)采用了大量的最新技術(shù)，如：動(dòng)態(tài)分析技術(shù)、可控啟動(dòng)技術(shù)、自動(dòng)張緊技術(shù)、多點(diǎn)驅(qū)動(dòng)技術(shù)、機(jī)尾快速自移技術(shù)、電控與監(jiān)測(cè)自動(dòng)化技術(shù)將直接影響生產(chǎn)，甚至造成人身傷亡。因此，確保其安全可靠地運(yùn)轉(zhuǎn)對(duì)礦井的安生產(chǎn)具有重要意義。
對(duì)于礦用鋼繩芯帶式輸送機(jī)來說，其單機(jī)工作長(zhǎng)度較長(zhǎng)，除了要解決一般帶式輸送機(jī)共有的滾筒打滑、膠帶跑偏、托輥壽命低等問題外，有效地預(yù)防和避免接頭斷裂、縱向撕帶、膠帶機(jī)火災(zāi)等重大事故發(fā)生顯得十分重要。對(duì)于跑偏和滾筒打滑等故障的監(jiān)測(cè)技術(shù)已十分成熟，并已獲得廣泛應(yīng)用。而對(duì)于斷帶、撕帶、火災(zāi)等重大事故的實(shí)時(shí)監(jiān)測(cè)問題卻一直沒有得到很好的解決，先后出現(xiàn)了不少監(jiān)測(cè)法和技術(shù)，但都存在著不同程度的問題。本文將著重介紹目前國(guó)內(nèi)外曾出現(xiàn)的針對(duì)鋼繩芯帶式輸送機(jī)斷帶、撕帶、火災(zāi)等重大事故的各類監(jiān)測(cè)方法和技術(shù)，然后提出一種實(shí)時(shí)監(jiān)測(cè)與保護(hù)系統(tǒng)，并且完成相應(yīng)的硬件和驅(qū)動(dòng)程序設(shè)計(jì)。歷經(jīng)近兩個(gè)世紀(jì)的發(fā)展，帶式輸送機(jī)的技術(shù)已經(jīng)發(fā)生了翻天覆地的變化。從采用天然材料的輸送帶到如今采用高強(qiáng)度人造合成材料，從短距離，低速到現(xiàn)在的長(zhǎng)距離、高速，在新技術(shù)的推動(dòng)下，帶式輸送機(jī)的性能正在不斷地提高。
對(duì)于帶式輸送機(jī)的技術(shù)來說，國(guó)外一直處于領(lǐng)先水平，主要體現(xiàn)在以下兩個(gè)方面：一方面，在本身的技術(shù)和裝備方面有了巨大的發(fā)展，如大運(yùn)量、高運(yùn)速、長(zhǎng)距離等大型帶式輸送機(jī)已成為其主要的研究和發(fā)展方向；另一方面，帶式輸送機(jī)的多元化、應(yīng)用范圍的擴(kuò)大化也取得了長(zhǎng)足的發(fā)展，如大傾角帶式輸送機(jī)機(jī)、平面或空間轉(zhuǎn)彎帶式輸送機(jī)、管狀帶式輸送機(jī)等各種機(jī)型。另外，國(guó)外帶式輸送機(jī)采用了大量的最新技術(shù)，如：動(dòng)態(tài)分析技術(shù)、可控啟動(dòng)技術(shù)、自動(dòng)張緊技術(shù)、多點(diǎn)驅(qū)動(dòng)技術(shù)、機(jī)尾快速自移技術(shù)、電控與監(jiān)測(cè)自動(dòng)化技術(shù)等。這些新技術(shù)的采用使帶式輸送機(jī)的設(shè)計(jì)、運(yùn)行效率、可靠性都有了極大的提高，其代表了當(dāng)今帶式輸送機(jī)發(fā)展的最新方向。經(jīng)過多年的發(fā)展，我國(guó)帶式輸送機(jī)的發(fā)展也有長(zhǎng)足的發(fā)展，技術(shù)水平有了很大的提高，特別是煤礦井下使用的大功率、長(zhǎng)距離帶式輸送機(jī)，其關(guān)鍵技術(shù)的研究和新產(chǎn)品的開發(fā)都取得了很大的進(jìn)步。如大傾角長(zhǎng)距離帶式輸送機(jī)成套設(shè)備，高產(chǎn)高效工作面順槽可伸縮帶式輸送機(jī)等均填補(bǔ)了國(guó)內(nèi)外空白，并對(duì)帶式輸送機(jī)的關(guān)鍵技術(shù)及其主要元部件進(jìn)行了理論研究和產(chǎn)品開發(fā)，研制成功了多種軟啟動(dòng)和制動(dòng)裝置以及以 PLC 為核心的可編程電控裝置，驅(qū)動(dòng)系統(tǒng)采用調(diào)速液力耦合器和行星齒輪減速器等。
與國(guó)外技術(shù)相比，我國(guó)帶式輸送機(jī)技術(shù)還有很大的差距，主要表現(xiàn)在：(1)大型帶式輸送機(jī)關(guān)鍵核心技術(shù)上的差距
①帶式輸送機(jī)動(dòng)態(tài)分析與監(jiān)測(cè)技術(shù)長(zhǎng)距離、大功率帶式輸送機(jī)的關(guān)鍵技術(shù)是動(dòng)態(tài)分析和監(jiān)測(cè)，它是制約大型帶式輸送機(jī)發(fā)展的核心技術(shù)。
②可靠的可控軟啟動(dòng)技術(shù)與功率均衡技術(shù)長(zhǎng)距離大運(yùn)量帶式輸送機(jī)由于功率大、距離長(zhǎng)且為多電機(jī)驅(qū)動(dòng)，必須采用軟啟動(dòng)方式來降低輸送機(jī)的張力，特別是采用多電機(jī)驅(qū)動(dòng)時(shí)。目前可控軟啟動(dòng)裝置大多使用國(guó)外的產(chǎn)品，這使產(chǎn)品的成本大大增加，急需國(guó)產(chǎn)化。11111111
(2)技術(shù)性能上的差距
我國(guó)帶式輸送機(jī)的主要性能與參數(shù)已不能滿足高產(chǎn)高效礦井的需要，尤其是順槽可伸縮帶式輸送機(jī)的關(guān)鍵元部件及其功能，如自移機(jī)尾、高效儲(chǔ)帶與張緊裝置等都與國(guó)外有很大差距。
(3)可靠性、壽命上的差距
主要體現(xiàn)在以下幾個(gè)方面：輸送帶抗拉強(qiáng)度、輸送帶接頭強(qiáng)度、托輥壽命、輸送機(jī)減速壽命，帶式輸送機(jī)上下可運(yùn)行時(shí)可靠性差距。
(4)控制系統(tǒng)上的差距
差距主要存在于驅(qū)動(dòng)方式、監(jiān)控裝置、輸送機(jī)保護(hù)裝置三個(gè)方面。
帶式輸送機(jī)保護(hù)系統(tǒng)發(fā)展現(xiàn)狀
帶式輸送機(jī)在運(yùn)行過程中，由于其工作環(huán)境惡劣，連續(xù)性工作時(shí)間長(zhǎng)，總會(huì)出現(xiàn)一些故障。常見的故障主要有：
(1)輸送帶跑偏
(2)帶式輸送機(jī)的撒料
(3)異常噪音
(4)驅(qū)動(dòng)減速機(jī)短軸
(5)輸送帶打滑
(6)輸送帶壽命短
(7)帶式輸送機(jī)凸弧段及凹弧段曲率半徑對(duì)輸送帶機(jī)托輥的影響
(8)托管運(yùn)轉(zhuǎn)不靈活
(9)托輥損壞
(10)機(jī)頭堆煤
(11)輸送機(jī)火災(zāi)
針對(duì)上述故障，需要專門的保護(hù)系統(tǒng)來預(yù)防和監(jiān)測(cè)故障的發(fā)生，從而使帶式輸送機(jī)能夠安全平穩(wěn)的運(yùn)行。對(duì)于上述的大部分故障，我國(guó)已經(jīng)開發(fā)出相應(yīng)的產(chǎn)品來對(duì)帶式輸送機(jī)進(jìn)行保護(hù)。如由兗州科欣機(jī)電設(shè)備制造有限公司生產(chǎn)的帶式輸送機(jī)綜合保護(hù)裝置，可實(shí)現(xiàn)帶式輸送機(jī)打滑、超溫、灑水、堆煤、急停、跑偏、撕裂、煙霧等基本保護(hù)。用先進(jìn)的以太網(wǎng)及現(xiàn)場(chǎng)總線技術(shù)，不但可以實(shí)現(xiàn)對(duì)帶式輸送機(jī)打滑（超速）、跑偏、斷帶、堆煤（堵塞）、滿倉(cāng)、超溫、灑水、煙霧等多項(xiàng)保護(hù)外，還可以顯示帶式運(yùn)輸機(jī)的運(yùn)行狀態(tài)、生產(chǎn)工況參數(shù)、設(shè)備故障狀態(tài)等。但是，對(duì)于影響輸送帶壽命的接頭斷裂及張力超限、縱向撕裂和輸送帶火災(zāi)這三類故障，尚未出現(xiàn)較為可靠的方法和技術(shù)來對(duì)其進(jìn)行實(shí)時(shí)監(jiān)控。雖然先后出現(xiàn)了不少監(jiān)測(cè)方法和技術(shù)，但都存在著不同程度的問題。因此，開發(fā)研制帶式輸送機(jī)實(shí)時(shí)工況監(jiān)測(cè)與綜合保護(hù)系統(tǒng)，以便及時(shí)有效地預(yù)防和避免各類事故的發(fā)生是十分必要的.。
本文研究開發(fā)鋼繩芯帶式輸送機(jī)實(shí)時(shí)監(jiān)測(cè)與保護(hù)系統(tǒng)，主要是基于 ARM9處理器 S3C2410 與嵌入式 Linux 的中央控制平臺(tái)。系統(tǒng)通過獲取帶式輸送機(jī)的各類傳感器的數(shù)據(jù)，進(jìn)行分析和比較然后得出對(duì)帶式輸送機(jī)故障的診斷和預(yù)報(bào)。
Belt conveyor as a Belt conveyor protection systems
continuous transport machinery, is widely used in coal Metallurgical grain and other fields.
But the failure of the belt conveyor has been plagued by its safe and reliable operation.
Mine production in particular, in the event of failure, it will directly affect mine production, and even cause personal injury or death. Therefore, to ensure that the belt conveyor safety, reliable operation, the mine production safety significance. This article selected steel cord belt conveyor as the object of study, by analyzing the failure of its existence, from the three aspects of their research, Joints and tension gauge, longitudinal tear belt, belt conveyor fire. By its failure to analyze, explore the mechanism of failure, then the selection of feasible monitoring methods, monitoring and prevention.
But the failure of the belt conveyor has been plagued by its safe and reliable operation.Mine production in particular, in the event of failure, it will directly affect mine production, and even cause personal injury or death. Therefore, to ensure that the belt conveyor safety, reliable operation, the mine production safety significance. This article selected steel cord belt conveyor as the object of study, by analyzing the failure of its existence, from the three aspects of their research, Joints and tension gauge, longitudinal tear belt, belt conveyor fire. By its failure to analyze, explore the mechanism of failure, then the selection of feasible monitoring methods, monitoring and prevention.
Finally, the paper design of hardware and drivers, application development and debugging
The belt conveyor is a modern bulk materials for transport equipment, are widely used in coal, metallurgy, electric power, chemical, mining, ports, building materials, food and other fields in the national economy plays an important role [1]. However, the transport machinery as a continuous belt conveyor, especially in mine production, in the event of failure, will directly affect production, and even cause personal injury or death. Therefore, to ensure their safety, reliable operation of the mine production safety significance.
For mining the steel cord belt conveyor, the length of its stand-alone work longer to solve the belt conveyor Total rollers skid, belt run, low roller life problems, to effectively prevent and avoidjoints, longitudinal tear tape, the tape machine fire, and other major incidents is very important. Deviation, and roller slip fault monitoring technology has been very mature, and has been widely used. Belt, real-time monitoring of the tear tape, fires and other major incidents has not been satisfactorily resolved, has appeared in a number of monitoring methods and techniques, but there are varying degrees of problems. The article will focus on at home and abroad had appeared.
Steel Cord Belt Conveyor belt, tear tape, fires and other accidents of various types of monitoring methods and techniques, and then proposed a real-time monitoring and protection system, and complete the appropriate hardware and driver design. After nearly two centuries of development, the belt conveyor technology has undergone enormous changes. Now using high-strength man-made synthetic material from the conveyor belt using natural materials, from a short distance, low speed to the long-distance, high speed, driven by new technology, the performance of the belt conveyor is continuously improving
Belt conveyor technology abroad has been at the leading level, mainly in the following two aspects: on the one hand, the tremendous development in technology and equipment, such as large capacity, high transport speed, longlarge distance belt conveyor has become its main direction of research and development; the other hand, the diversification of the belt conveyor, the expansion of the scope of application has also made considerable development, such as angle belt conveyor machine.plane or space to turn belt conveyors, tubular belt conveyor models. In addition, foreign belt conveyor using the latest technology, such as: dynamic analysis techniques, controlled start technology, automatic tensioners technology, multi-drive technology, the tail quickly self-shifting technology, electronic control and monitoring automation technology will be directly impact on production, and even cause personal injury or death. Therefore, to ensure safe and reliable operation of great significance to the mine safety and production.
For mining the steel cord belt conveyor, the length of its stand-alone work longer, in addition to common roller skid to solve the general belt conveyor belt run, low roller life problems, to effectively prevent and avoidjoints, longitudinal tear tape, the tape machine fire, and other major incidents is very important. Deviation, and roller slip fault monitoring technology has been very mature, and has been widely used. Belt, real-time monitoring of the tear tape, fires and other major incidents, but has not been satisfactorily resolved, has appeared in a number of monitoring methods and techniques, but there are varying degrees of problems. This article will focus on the present appear for steel cord belt conveyor belt, tear tape, fires and other major incidents of various types of monitoring methods and techniques, and then proposed a real-time monitoring and protection systems, and complete the hardware and driver design. After nearly two centuries of development, the belt conveyor technology has undergone enormous changes. Now using high-strength man-made synthetic material from the conveyor belt using natural materials, from a short distance, low speed to the long-distance, high speed, driven by new technology, the performance of the belt conveyor is continuously improving.
Belt conveyor technology abroad has been at the leading level, mainly in the following two aspects: on the one hand, the tremendous development in technology and equipment, such as large capacity, high transport speed, longlarge distance belt conveyor has become its main direction of research and development; the other hand, the diversification of the belt conveyor, the expansion of the scope of application has also made considerable development, such as angle belt conveyor machine.plane or space to turn belt conveyors, tubular belt conveyor models.In addition, foreign belt conveyor using the latest technology, such as: dynamic analysis techniques, controlled start technology, automatic tensioners technology, multi-drive technology, the tail quickly self-moving technology, electronic control and monitoring automation technology. Adoption of these new technologies to the design of the belt conveyor, operating efficiency, reliability has improved greatly, which represents the latest direction of today's belt conveyor. After years of development, the development of our belt conveyors also have made great progress, the technical level has been greatly improved, especially the coal mine to use the high-power, long distance belt conveyor, and its key technologies and new products development have made great progress. Such as the big dip long distance belt conveyor equipment, high yield and efficient working face telescopic belt conveyor, etc. to fill gaps in the domestic and foreign, and belt conveyor technology and its main components, a theoretical study and product development, successfully developed a variety of soft start and braking device and the PLC as the core programmable electronic control device, the drive system with variable speed hydraulic coupling and planetary gear reducer.
Compared with foreign technology, the belt conveyor technology in China still lags behind, mainly: (1) large belt conveyor key core technological gap
(1) belt conveyor dynamic analysis and monitoring long-distance, high-power belt conveyor technology is the dynamic analysis and monitoring, which is the core technology to restrict the development of large belt conveyor
② controlled soft-start technology and the power balance long distance and large capacity belt conveyor power, long distance, reliable and multi-motor drive, you must use a soft start to reduce the tension of the conveyor, in particular the multi-motordrive. Controlled soft-start devices mostly use foreign products, which makes the cost of the product greatly increased the urgent need of localization.
(2) technical performance gap
The belt conveyor performance and parameters of our country can no longer meet the needs of the high yield and efficient mine, especially the smooth groove telescopic belt conveyor key components and their functions, such as shift of the tail, efficient storage with tensioning deviceand so have a big gap with foreign.
(3) reliability, the gap in life expectancy
Is mainly reflected in the following areas: tensile strength of the conveyor belt, conveyor belt joint strength, roller life, reliability gap between the conveyor reducer life, can run up and down the belt conveyor.
(4) the gap on the control system
The gap is mainly for driving, monitoring devices, conveying the three aspects of the machine protection device.
Belt Conveyor Protection System Development Status
The belt conveyor during operation, due to their poor working conditions, the continuity of long working hours, there will always be some failures. Common fault:
(1) conveyor belt deviation
(2) Scatter material of the belt conveyor
(3) abnormal noise
(4) driver reducer short axis
(5) conveyor belt slipping
(6) conveyor short life.
((7) belt conveyor convex arcs and concave radius of curvature of the roller of the conveyor belt machine
(8) managed operation is not flexible
(9) roller damage
(10) head the pile of coal
(11) conveyor fire
In response to these failures, the need of special protection systems to prevent the occurrence and monitoring failure, so that the belt conveyor can secure and running smoothly. For the majority of these failures, China has developed the appropriate product to protect belt conveyors. Limited production belt conveyor protection devices, such as by Yanzhou Kexin mechanical and electrical equipment manufacturing can achieve belt conveyor skid, over-temperature, watering the pile of coal, emergency stop, the deviation, tearing, smoke protection. With advanced Ethernet and fieldbus technology, not only can slip on the belt conveyor (speeding), deviation off with coal heap (blocked), a number of protection outside warehouse full of over-temperature, sprinklers, smoke, can also display the operational status of the belt conveyor, the parameters of the production conditions, equipment failure status. Joints and tension of the conveyor belt life gauge, longitudinal tear and conveyor belt fires these three types of failure, however, has not yet appeared more reliable methods and techniques to their real-time monitoring. Has appeared in a number of monitoring methods and techniques, but there are problems of varying degrees. Therefore, the development of the belt conveyor real-time condition monitoring and protection system, in order to timely and effective manner to prevent and avoid the occurrence of accidents is very necessary.
In this paper, the development of real-time monitoring and protection of steel cord belt conveyor system, central control ARM9 S3C2410 processor with embedded Linux-based platform. System by getting the belt conveyors of various types of sensor data for analysis and comparison and then come to the diagnosis and prediction of the belt conveyor failure.
Design and Research In this paper, the following aspects:
(1) analysis of the three types of failure of the steel core rope belt conveyor (Joints and longitudinal tear, fire, tension gauge, etc.) occurs because the design of the sensor selection and signal conversion circuit;
(2) for the actual needs of the belt conveyor protection systems, custom platform plates, complete chip selection, system selection;
(3) software requirements for belt conveyor protection systems, the completion of each module, including the design of the CAN, LCD, A / D, keyboard and other drivers;
(4) (4) build a program development environment, driver and application debugging. Belt conveyor failure analysis and monitoring methods
The belt conveyor failures are mainly distributed in three aspects: Joints and tension gauge monitoring, longitudinal tear with monitoring and transport machine-fire monitoring. Thesis from the three aspects of the belt conveyor failures were analyzed to determine the monitoring methods and sensors to choose. Monitoring of belt conveyor Joints
(1) connector fracture
Tape belt conveyor parts, it is carrying, but also a force transmission. Belt conveyor operation of the process, the tape to withstand a variety of different nature and size of loads, it is extremely complex stress state, this state makes the overall characteristics of the belt conveyor impact is very large. At the same time, the cost of tape about half the cost of the entire belt conveyor, plays an important role in the economy. Tape structure can be divided into the Steel Belt and fabric cord belt. The fabric cord belt type of the vinylon core, ordinary canvas core, nylon core, from top to bottom cover and with a core composition. With a core made ??by the warp and weft knitting fabric layer, whose role is to pass traction, load carrying and loading and unloading of materials on the impact of the tape.
Structurally, it is a composite material. Steel Belt with core layout consists of a series of parallel, together with a core adhesive rope, is typical of orthotropic materials, the longitudinal force to bear by the rope. Which is characterized by high strength, the longitudinal elastic modulus, good impact resistance. However, relative to the fabric cord belt, its viscous characteristics than the fabric cord belt is weak [3]. Causing the conveyor belt joint damage and fracture are many reasons, incorrect coating for example, due to the production process, coated with liquid adhesive, wrong to suppress temperature, and load imbalance and belt deviation [6]. However, no matter what causes joint damage and even rupture, are inevitably accompanied by the connection zone of deformation increases and the steel core tic Often the past, the tensile deformation of the connector region growing, and finally, when deformation increases to a limit, it not enough to withstand the work load will result in the connection zone deformation increases rapidly, resulting in the belt.
The introduction of the conveyor belt inherent characteristic curve FL (tension - length) curve, we can further instructions.
Allow for the most with the deformation. Inherent characteristic curve of the conveyor belt (FL curve) changes with the change of strain and tension. When the strain and tension increase, the curve moves to the right along the L axis. Become weak due to joint stiffness and strength will also lead to the curve slope decreases. If the damage of the joints continue to develop, the amount of drift of the FL curve and slope reduction is also increasing (2) the selection of the sensor system uses Hall sensors to monitor the deformation of the connector area. Hall sensor consists of two parts: the Hall element and magnetic blocks, according to the Hall effect principle, through the Hall element to feel the magnets cause the magnetic field changes. Hall sensor uses a Hall element for the monostable switch integrated Hall element, the repeatability of positioning and high precision, fast response frequency (up to 50kHz), is an ideal location of the monitoring sensors.
(2) connector, the length of the measurement method
The so-called joint deformation, in fact, joints deformed and deformed joints regional difference. Can be monitored by monitoring the deformation of the joint changes in the length of the connector region. Hall element to measure the connector length There are many ways, their common characteristics depend on the magnetic field positioning components, and to feel the position of the magnet through the Hall element, thus the connector length. The system uses the principle of the test shown in Figure 2-3, the magnets 1,2 embedded in the region of belt joints at both ends, is installed in a fixed position of the belt below the two Hall elements a, b, of which, a should keep the proper distance between a and b, and the rest of the belt should also maintain the right distance. When the belt speed v through the Hall element, due to the Hall effect, the Hall element four pulse signal. Sh
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