连续滚筒式沥青搅拌站计量系统研究
发布时间：2018-11-26 08:17
【摘要】：沥青搅拌站是公路建设中非常重要的一部分，主要分为强制间歇式沥青搅拌站和连续滚筒式沥青搅拌站。连续滚筒式沥青搅拌站与强制间歇式沥青搅拌站相比较有许多的优势，但是由于早期的技术发展的局限性，连续滚筒式沥青搅拌设备存在缺陷，使得国内用户与公路界的人士都普遍认为连续滚筒式搅拌设备不适合在高速公路的施工上应用。随着国外连续滚筒式搅拌站设备技术的改进与我国高速公路的发展，尤其是随着早期修筑的高速公路的大修时期的到来，，以及社会对于环保性能和能耗率等方面的要求越来越高，使得连续滚筒式沥青搅拌设备开始逐渐进入我国。连续滚筒式沥青搅拌设备将成为我国未来沥青搅拌设备发展的必然趋势，提高其计量精度将促进其快速发展。 本文研究连续滚筒式沥青搅拌站计量系统，其重点在于以下几点：一、了解其发展过程、设备结构、工艺要求和计量方式；二、对骨料计量系统进行了研究，对集料皮带秤的秤架结构（单杠杆式、双杠杆式、悬浮式）进行了受力分析与传感器受力曲线意义讨论，通过分析对比得出：悬浮式秤架在提高集料计量静态精度方面具有较强的优越性。并通过对沥青搅拌站电子皮带秤使用特点的考虑，确定采用三托辊悬浮式电子皮带秤。文中以DTII带式输送机为例，用有限元分析代替挠度公式计算对三托辊悬浮式秤体结构进行优化设计，确定传感器的最佳安放位置，使其受力不受秤体变形的影响，从而提高骨料集料静态计量精度；三、研究了称量系统的控制算法、针对传统的计量方法的缺陷，提出了改进方案：为了保证配比精度控制采用了双闭环比值控制，为实现恒流量控制系统采用了增量式PID控制，并通过Simulink对系统的控制算法进行了仿真，根据仿真结果可以看出本文所采用的方案能够保证系统的配比精度，实现系统恒流量控制；四、根据连续滚筒式沥青搅拌站计量系统的工艺特点与PLC的选型依据对本系统所使用的PLC进行选型和PLC控制程序的设计，主要包括称重程序、增量式PID控制子程序、中断程序和滤波程序。 通过本文的研究，提高了连续滚筒式沥青搅拌站计量系统的计量精度，为连续滚筒式沥青搅拌站设备在我国的发展提供了依据。
[Abstract]:Asphalt mixing station is a very important part of highway construction. It is mainly divided into compulsory intermittent asphalt mixing station and continuous roller asphalt mixing station. The continuous roller asphalt mixing station has many advantages compared with the forced intermittent asphalt mixing station, but because of the limitation of the early technology development, the continuous roller asphalt mixing equipment has some defects. It is believed that continuous drum mixing equipment is not suitable for highway construction. With the improvement of the technology of continuous drum mixing station abroad and the development of expressway in China, especially with the arrival of the overhauling period of the early built expressway, As well as the social requirements for environmental performance and energy consumption are becoming higher and higher, which makes the continuous roller asphalt mixing equipment gradually enter our country. Continuous roller type asphalt mixing equipment will become the inevitable trend of the future development of asphalt mixing equipment in China, and the improvement of its measuring accuracy will promote its rapid development. In this paper, the measurement system of continuous roller type asphalt mixing plant is studied. The main points are as follows: first, understand its development process, equipment structure, process requirements and measurement methods; Secondly, the aggregate metering system is studied, and the structure of the weigher (single lever, double lever, suspension) of aggregate belt weigher is analyzed and the significance of sensor force curve is discussed. Through the analysis and comparison, it is concluded that the suspended scale has strong advantages in improving the static accuracy of aggregate metering. Considering the application characteristics of electronic belt scale in asphalt mixing station, the three-roller suspension electronic belt scale is adopted. Taking the DTII belt conveyor as an example, the structure of the three-roller suspension scale is optimized by means of finite element analysis instead of deflection formula, and the optimum position of the sensor is determined so that the force is not affected by the deformation of the scale. In order to improve the static measurement accuracy of aggregate; Thirdly, the control algorithm of weighing system is studied. Aiming at the defects of the traditional metering method, an improved scheme is put forward: in order to ensure the control of matching precision, the double closed loop ratio control is adopted, and the incremental PID control is used to realize the constant flow control system. The control algorithm of the system is simulated by Simulink. According to the simulation results, it can be seen that the scheme adopted in this paper can guarantee the accuracy of the system and realize the constant flow control of the system. Fourthly, according to the technological characteristics of the measuring system of continuous roller type asphalt mixing station and the selection of PLC, the PLC used in this system is selected and the PLC control program is designed, which mainly includes weighing program, incremental PID control subroutine, Interrupt program and filter program. Through the research in this paper, the measuring accuracy of the continuous roller type asphalt mixing station is improved, which provides the basis for the development of the continuous roller type asphalt mixing station equipment in our country.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U415.522
本文编号：2357927
[Abstract]:Asphalt mixing station is a very important part of highway construction. It is mainly divided into compulsory intermittent asphalt mixing station and continuous roller asphalt mixing station. The continuous roller asphalt mixing station has many advantages compared with the forced intermittent asphalt mixing station, but because of the limitation of the early technology development, the continuous roller asphalt mixing equipment has some defects. It is believed that continuous drum mixing equipment is not suitable for highway construction. With the improvement of the technology of continuous drum mixing station abroad and the development of expressway in China, especially with the arrival of the overhauling period of the early built expressway, As well as the social requirements for environmental performance and energy consumption are becoming higher and higher, which makes the continuous roller asphalt mixing equipment gradually enter our country. Continuous roller type asphalt mixing equipment will become the inevitable trend of the future development of asphalt mixing equipment in China, and the improvement of its measuring accuracy will promote its rapid development. In this paper, the measurement system of continuous roller type asphalt mixing plant is studied. The main points are as follows: first, understand its development process, equipment structure, process requirements and measurement methods; Secondly, the aggregate metering system is studied, and the structure of the weigher (single lever, double lever, suspension) of aggregate belt weigher is analyzed and the significance of sensor force curve is discussed. Through the analysis and comparison, it is concluded that the suspended scale has strong advantages in improving the static accuracy of aggregate metering. Considering the application characteristics of electronic belt scale in asphalt mixing station, the three-roller suspension electronic belt scale is adopted. Taking the DTII belt conveyor as an example, the structure of the three-roller suspension scale is optimized by means of finite element analysis instead of deflection formula, and the optimum position of the sensor is determined so that the force is not affected by the deformation of the scale. In order to improve the static measurement accuracy of aggregate; Thirdly, the control algorithm of weighing system is studied. Aiming at the defects of the traditional metering method, an improved scheme is put forward: in order to ensure the control of matching precision, the double closed loop ratio control is adopted, and the incremental PID control is used to realize the constant flow control system. The control algorithm of the system is simulated by Simulink. According to the simulation results, it can be seen that the scheme adopted in this paper can guarantee the accuracy of the system and realize the constant flow control of the system. Fourthly, according to the technological characteristics of the measuring system of continuous roller type asphalt mixing station and the selection of PLC, the PLC used in this system is selected and the PLC control program is designed, which mainly includes weighing program, incremental PID control subroutine, Interrupt program and filter program. Through the research in this paper, the measuring accuracy of the continuous roller type asphalt mixing station is improved, which provides the basis for the development of the continuous roller type asphalt mixing station equipment in our country.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U415.522
【引证文献】
相关期刊论文 前1条
1 徐明晶;;探究连续式与间歇式沥青混合料搅拌设备的对比[J];江西建材;2016年05期
本文编号：2357927
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