JBT7325-1994农林窄轮距轮式拖拉机防护装置强度试验方法和验收条件

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1、J日中华人民共和国机械行业标准JB7325一94农林窄轮距轮式拖拉机防护装置强度试验方法和验收条件1994-07-18发布1995-07-01实施中华人民共和国机械工业部发布目次1主题内容与适用范围···························，.·····································“·········”···⋯⋯(1)2引用标准··················“···⋯⋯、·······································”·”·······”·····”

2、······⋯⋯(1)3定义························································································“····“·“··“··一(1)4符号·····································································，.·，··········”···············⋯⋯(1)S试验设备·······································

3、······，.··，.·“·，.·····································⋯⋯(1)6拖拉机和防护装置的试验准备············································，.····“·.··..·..·..·..，.⋯⋯(2)7前置式防护装置的预备试验·················，···································”········.·..·.⋯⋯(2)8试验步骤和要求······························

4、·······················································⋯⋯(4)9公差·..............................................................................................................(10)1。容身区·······················‘·······························································

5、··”·······⋯⋯(10)11验收条件·······················································。········································⋯⋯(12)12试验报告················，.················。··················································⋯⋯”··⋯⋯(12)附录A防护装置强度试验报告(参考件)··························

6、···················，.············⋯⋯(13)中华人民共和国机械行业标准农林窄轮距轮式拖拉机防护装置JB7325一94强度试验方法和验收条件1主题内容与适用范围本标准规定了农业、林业窄轮距轮式拖拉机防护装置的强度试验方法和验收条件。本标准适用于具有两轴的充气轮胎拖拉机，其前轴和后轴的离地间隙应不大于600mm;后轮固定或可调式最小轮距应不大于1150mm;拖拉机空载质量(包括防护装置和制造厂提供的最大轮胎)应大于Gookg，如具有前置式防护装置应同时小于3000kg,2引用标准GB1102圆股钢丝绳GB

7、7121农林轮式拖拉机防护装置强度试验方法和验收条件JB/T6715农业拖拉机驾驶座标志点3定义本标准采用的术语及定义同GB7121第3章。4符号本标准所使用的符号含义如下:阴—拖拉机参考质量,kg;B,防护装置最大外廓宽度，mm;B-拖拉机最小外廓宽度，mm;D—防护装置在撞击点的变形量(动载)或加载点沿加载线的变形量(静载),mm;H-—摆锤质心提升的高度，mm;F-静载力，N;Fm=—加载期间出现的最大静载力(超载试验除外),N;F-D—力和变形的曲线;E,.—侧向加载所吸收的输入能量，J;E=—纵向加载时所吸收的输入能量,J:

8、F,-垂直压垮力，N;E;—吸收的应变能，即F-D曲线下面的面积，J;L—参考轴距，应不小于最大轴距，MM;I-一绕后轴的参考惯性矩，不包括后轮，应不小于绕后轴的最大惯性矩,kg·mzo5试验设备5.1确定驾驶座标志点位