| The wear of the friction pair of the bottom pivot of the herringbone gate has been widely concerned by researchers.In this paper,the effect of different oil tank parameters on the friction and wear of the friction pair is studied by equivalent test methods.Based on the actual operating conditions of the bottom pivot,the spherical bearing friction and wear test bench was designed and manufactured according to the equivalent and similar criteria.The loading force and speed range of the test bench were set at 0-2000 N and 0-5r according to the equivalent principle.Between / min,the load force,speed and torque values can be collected online according to the test requirements.using the commonly used bottom pivot pairing material(45 # steel and tin bronze)under grease lubrication conditions to study the friction characteristics and mechanism of friction grooves with oil tanks with different parameters on the bearing pad Analyze and analyze the wear from the perspective of the amount of wear and friction coefficient to obtain a set of parameters that can optimally improve the abrasion resistance and service life of the bottom pivot,and perform a ferrospectral analysis on the grease after the test.The spectrum analysis results analyze the wear mechanism of each sample under different oil tank parameters.The research results show that:(1)The test was carried out on a self-designed test bench,and the following conclusions were drawn: Under the test conditions of 5r / min and 1500 N,when the depth of the oil groove and the width of the oil groove are constant,the amount of bearing wear and friction coefficient increases with the number of oil grooves It will be reduced.When the number of oil grooves is 3,the bearing bushes will have the largest amount of wear and the most serious wear.When the number of oil grooves is 6,the bearing bushes will have the least amount of wear and the best wear resistance.When the number of oil grooves and the width of oil grooves are constant,the wear of the bearing pads will first decrease and then increase with the increase of the oil groove depth.There is an optimal value range for the influence of oil groove depth on the amount of bearing pad wear.The oil groove depth is 0.25 mm.At-0.75 mm,the wear and friction coefficient of the bearing pad will decrease as the depth increases.When the depth of the oil groove is in the range of 0.75mm-1.0mm,the wear amount of the bearing pad will become larger at this time,so the best can be improved Bearing pad abrasion resistance,the depth of the oil groove to improve the bearing pad life is 0.75 mm.When the number of oil grooves and the depth of oil groovesare constant,when the oil groove width is between 2.0mm-3.0mm,the wear and friction coefficient of the bearing bush will decrease with the increase of the width.When the oil groove width reaches 3.0mm,the wear amount is the smallest.When the oil groove width further increased to 3.5 mm,the amount of bearing wear began to increase,and the friction coefficient also increased,indicating that the best oil groove width that could improve the wear resistance of the bearing was 3.0 mm.(2)Based on the grease collected after the test,an iron spectrum analysis test was performed to analyze the wear mechanism of each pair of pairs under different oil groove parameters.The analysis results show that the change of the oil groove parameters will not affect the wear mechanism of the friction pair.The wear form of the paired pairs is mainly fatigue wear.(3)Based on the amount of wear,the service life of the bearing bushes of each sample was evaluated,and the time of failure when the amount of bearing bushings reached 2 mm under different oil groove parameters was obtained.Based on the comprehensive consideration of the amount of wear and service life,it was concluded that when the number of oil grooves was 6,When the depth is 0.75 mm and the width is 2.5mm,the wear resistance of the bottom pivot bush is the best and the service life is the longest. |
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