In the operation of biogas generator set, if the connecting rod is twisted, it will change the parallelism and perpendicularity of the center line of piston pin and the cylinder of crankshaft center line. The piston will tilt back and forth in the middle of the cylinder and the clearance will cause eccentric wear of the piston connecting rod set. In the process of accelerating wear of components, the cylinder will be operated in biogas generator mode when it is severe. If the connecting rod is twisted, it will change the center line of piston pin and the cylinder of crankshaft The parallelism and perpendicularity of the center line of the cylinder and the front and back inclination and clearance of the piston in the middle of the cylinder lead to the eccentric wear of the piston connecting rod group. In the process of accelerating the wear of the components, the cylinder pulling will occur seriously. The following is the method to introduce the deformation of the test rod of the biogas generator set:

　　(1)清洗活塞、活塞環和氣缸后，將無活塞環的活塞連桿裝進氣缸，按規定扭矩擰緊連桿螺栓。

　　(1) After cleaning the piston, piston ring and cylinder, install the piston connecting rod without piston ring into the cylinder, and tighten the connecting rod bolts according to the specified torque.

　　(2)將曲軸轉動幾次，使活塞連桿處于自由狀態。連桿小頭兩側與活塞銷座孔之間的距離不得小于1mm。

　　(2) Turn the crankshaft several times so that the piston rod is free. The distance between the two sides of the connecting rod small end and the piston pin seat hole shall not be less than 1mm.

　　(3)轉動曲軸使活塞在氣缸的中間。檢查活塞頂前后端間隙差不大于0.10mm。若大于0.10mm，則連桿變形?；钊?上下停止點間隙也應該是一樣的,如果離開上下停止點間隙差距逐漸增加,中間位置的活塞旅行間隙差別較大,在活塞的往復運動也改變的方向偏轉,這表明必須有連桿的失真。

　　(3) Turn the crankshaft so that the piston is in the middle of the cylinder. Check that the clearance difference between the front and rear ends of the piston crown is not more than 0.10 mm. If it is more than 0.10 mm, the connecting rod is deformed. The clearance between the upper and lower stop points of the piston cylinder should be the same. If the gap between the upper and lower stop points increases gradually, the travel clearance of the piston in the middle position will vary greatly, and the direction of the reciprocating movement of the piston will also change, which indicates that there must be distortion of the connecting rod.

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