ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Aiming to solve the problem of the cumbersome adjustment of the static test equipment of tractor roll-over protective structures, high labor intensity, the low degree of automation and efficiency of operation, a static load test system for tractor roll-over protective structures which can greatly reduce labor force, improve automation level and increase the utilization of site was developed. Based on the modular design of the test system, it was composed of mechanical loading and auxiliary system, hydraulic power source system, data acquisition and processing system, control system, etc. The tractor roll-over protective structure was fixed by disposable clamping, and the static load test of the tractor roll-over protective structures under different working conditions was realized by moving the loading column in different spatial locations, pressing the beam, manual or remote adjustment and automatic loading and so on. The test system established the communication between the industrial computer and the PLC, it had a wide range of applications, and it can not only test the four-post and six-post cabs of agricultural machinery, but also test the folding and nonfolding safety frames. The horizontal longitudinal, lateral and two times vertical pressure tests of WD1104 wheeled tractor safety cab were carried out by using the test system. The results showed that the performance of the system was stable, the energy control error under longitudinal loading and lateral loading was 0.55% and 0.03%, the crushing force control error of vertical rear crushing and vertical front crushing tests was 0.63% and 0.16%, respectively. Therefore, the static load test system can meet the requirements of the relevant standards for test equipment.