機械式機構大約到19世紀末達到成熟，現在幾乎所有使用的機構（自動(dòng)裝）在其歷史上都能見(jiàn)到。 In addition, the mechanical institutions reached maturity by the end of nineteenth Century. Now almost all the institutions (automatic devices) can be seen in its history. （2）力作用線(xiàn) (2) force action line 為了只觀(guān)地表示力在機械機構中怎樣傳遞下去的狀態(tài)，將力看作猶如在構件中留動(dòng)的樣子，描繪在草案圖的機械中。表示這個(gè)力“流動(dòng)”的線(xiàn)，在設計考察中起著(zhù)重要作用。例如：產(chǎn)生某種動(dòng)作的機械，如果處于靜態(tài)平衡，難么力作用線(xiàn)在整體系統中封閉。如果力線(xiàn)不封閉，或者該機械正題開(kāi)始加速運動(dòng)或者在空間分解。轉動(dòng)力矩的作用現也同樣。 In order to see only the state of the transmission of the surface force in the mechanical mechanism, the force is regarded as if it is left in the component, depicted in the machinery of the draft map. The line that indicates the force "flow" plays an important role in design investigation. For example, a machine that produces certain action, if it's in a static equilibrium, the hard force line will be closed in the whole system. If the force line is not closed, or the mechanical topic begins to accelerate motion or decompose in space. The effect of the moment of rotation is the same. （3）平衡 (3) balance 僅對于由重力產(chǎn)生的力，其力線(xiàn)不封閉。這里，重力所產(chǎn)生的逆轉力矩成為額外難題。機械處于靜態(tài)時(shí)出現逆轉的部位是機械型線(xiàn)  流水槽模具 景觀(guān)石 檢查井鋼模具 保定通風(fēng)管道 隔離墩模具 保定保潔公司的根本缺陷之處。不要制作頭重腳輕或左右重力不能保持平衡的物體。這是應為這樣的物體受到一點(diǎn)水平向外就會(huì )翻轉的緣故。此外，把握機械的大致重量，穩心的位置也是非常重要的。特別是，如果重心水平方向位于安裝地腳之外，則會(huì )失去自身平衡，是機器出現非正常狀態(tài)，這一點(diǎn)要給以注意。 The force line is not closed only for the force generated by gravity. Here, the reverse torque generated by gravity becomes an additional problem. When machinery is in static state, the reverse part is the fundamental defect of machinery. Don't make top-heavy or gravity balance objects. This is the reason why such an object will be turned outward at a certain level. In addition, it is very important to grasp the approximate weight of machine and the location of the center of stability. In particular, if the horizontal direction of gravity is located outside the installation ground, it will lose its balance, which is the abnormal state of the machine