以下为句子列表：
英文: Abstract: In the light of the problems of the air balance system of Model LCJ1250 chain drive pumping unit, it is proposed to change the air balance with counterweight balance, and three criteria for the modification is put forward:(1) ensuring the reliab
中文: 文摘:针对LCJ1250气平衡式链条抽油机存在气平衡故障率高和现场维修困难等问题，提出将气平衡改造成工作可靠的重力平衡的方案，并确定了改造的三个原则：一是保证整机的可靠性，使抽油机运转平稳，振动噪音小，寿命长；二是力求降低生产成本，减少零部件制造，尽可能选用原来的通用件，舍去平衡缸和空气包等气平衡附件，在原往返架主体上悬挂一个配重箱；三是力求不改变冲程、冲次及最大悬点载荷等主要技术参数。
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英文: Based on the theory of reliability design, combined with the conventional design code and the way of roller chain drive, the author discusses the reliability design of roller chain drive and provides some design examples.
中文: 摘要根据可靠性设计理论，结合套筒滚子链传动的传统设计准则和方法，研讨了套筒滚子链传动的可靠性设计方法，并列举了设计实例。
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英文: In the light of the problems of the air balance system of Model LCJ1250 chain drive pumping unit, it is proposed to change the air balance with counterweight balance, and three criteria for the modification is put forward:(1) ensuring the reliability of t
中文: 针对LCJ1250气平衡式链条抽油机存在气平衡故障率高和现场维修困难等问题，提出将气平衡改造成工作可靠的重力平衡的方案，并确定了改造的三个原则：一是保证整机的可靠性，使抽油机运转平稳，振动噪音小，寿命长；二是力求降低生产成本，减少零部件制造，尽可能选用原来的通用件，舍去平衡缸和空气包等气平衡附件，在原往返架主体上悬挂一个配重箱；三是力求不改变冲程、冲次及最大悬点载荷等主要技术参数。
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英文: Single speed motor drive connected to a Helical Worm Gear and a totally enclosed Connecting Gear Box with heavy duty chain drive to the rolls and with fixed friction ratio according to customers request (normally 1: 1,2).
中文: 系统带有同螺旋涡齿轮以及全封闭齿轮箱的单速马达，它带有重型链传动系统并可根据客户的需要固定摩擦比（通常为1:1.2）。
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英文: The chain drive rigs are driven by the integral enclosed compound chain box and torque converter. During rig moves, the chains can be dismantled for ease of installation.
中文: 链传动钻机采用整体密闭式并车链条箱与变矩器统一驱动形式，在钻机搬家时无需拆装链条，可实现快速安装。
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