门座式起重机分单臂架和四连杆两种类型，起重机的起升、变幅、回转和行走四大机构均采用交流变频调速，整机采用PLC控制，使用性能优越。
Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.
四连杆门座式起重机采用最佳优化的组合臂架系统，具有水平落差小、变幅平稳、功耗低的特点。
Four-link portal crane using the best combination of optimized boom system, with horizontal small gap, amplitude stable, low power consumption.
这种抽油机以连杆式换向机构取代原有的十字滑块式换向架，以重块平衡代替气平衡，并改进了导向系统。
The new unit uses the pitman reserse mechanism instead of the crosshead slide reverse rack, adopts weight balancing instead of air balancing, and is provided with an improved guiding system.
像总泵、车轮、转向液压缸、微动阀、连杆、门架滚轮、转向桥等部位，只要靠紧固进行调整就能修理的故障。
Failures which can be solved by minor adjustment on brake pump, wheel, steering hydraulic cylinder, and micro-valve, connect level, mast roller, steering axle, etc. are excluded.
四连杆组合臂架是门座起重机最常用的变幅机构形式之一。
The four-bar combination jib is one of the most commonly used forms of the derricking mechanism for portal cranes.
无换向架链条抽油机的链条承受的总拉力为悬点载荷与平衡重的差值加连杆对链条的水平分力在链条上形成的附加拉力之和，受力状况优于普通链条抽油机，且能得到控制。
The force conditions of the chain on a chain drive pumping unit without reverse rack are much more favorable than that on conventional chain drive pumping units, and can be well controlled.
无换向架链条抽油机的链条承受的总拉力为悬点载荷与平衡重的差值加连杆对链条的水平分力在链条上形成的附加拉力之和，受力状况优于普通链条抽油机，且能得到控制。
The force conditions of the chain on a chain drive pumping unit without reverse rack are much more favorable than that on conventional chain drive pumping units, and can be well controlled.
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