Bucket tip load equivalent model and experiment on loader working device(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年03期
- Page:
- 119-126
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Bucket tip load equivalent model and experiment on loader working device
- Author(s):
- WAN Yi-pin; SONG Xu-ding; YU Lu-ping; YUN Zheng-wen
- 1. Key Laboratory of Road Construction Technology and Equipment of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Engineering Machinery Research Institute, Xuzhou Construction Machinery Group, Xuzhou 221004, Jiangsu, China
- Keywords:
- mechanical engineering; loader; working device; equivalent model; bucket tip load
- PACS:
- U415.514
- DOI:
- -
- Abstract:
- In order to obtain external load time history of loader working device in shoveling process, load spectrum compilation and fatigue bench test was carried out, and calculation method through bucket hinge hole loads to equal bucket tip load was proposed. The moving coordinate system was established on the bucket. The transformation relationship between the moving coordinate system and the geodetic coordinate system was obtained by the D-H(Denavit-Hartenberg) matrix. The operating postures of loader were determined according to the displacement of cylinder. Theoretical solutions of the equivalent loads at bucket tip were obtained by mechanical force model of the bucket under fixed stance. A pin axis sensor was designed, and the linear function relationship between external load and output voltage of the bridge in all directions was obtained through the calibration test. The multi-parameter load synchronous test system was established which include pin axial force, lateral force, pull rod force, boom structural stress, boom cylinder and bucket cylinder displacement. Through the shovel loading test, the basic load parameters in coordinate system fixed on the bucket such as pin force, structure measuring point stress and oil cylinder displacement were obtained. Based on the basic load parameters, finite element analysis of the working device was carried out with the equivalent load of bucket tip as outside load. The results show that the equivalent load time history can be obtained through the measured load parameters and the bucket tip load equivalent model which can reflect the real force characteristics of the bucket tip in the loader working device. The bucket tip load time history exhibits marked periodic variations. The large load appears at the time of shoveling and unloading particle material. The maximum relative error between the simulated value and the measured value of the boom structure is 9.07%. The pin load with continuous change in size and direction is equivalent to the bucket tip under the fixed coordinate system with the bucket in fixed stance, which provides the basis for the load spectrum compilation and fatigue test of loader working device.
Last Update: 2017-06-06