升降機廠家認為，為了避免活塞在行程兩端沖撞缸蓋，產生噪聲，影響工件精度以至損壞機件，常在天津升降貨梯液壓泵站系統中液壓缸兩端設置緩沖裝置。其作用是利用油液的節流原理來實現對運動部件的制動。常用的緩沖裝置、有環狀間隙式、節流口可調式、節流口可變式三種形式。Elevator manufacturers believe that, in order to avoid collision at both ends of the stroke piston cylinder head, noise, impact and precision mechanical damage, often two ends of the hydraulic cylinder buffer device is arranged in Tianjin lifting elevator hydraulic pump station system. Its role is to use the throttle principle of oil to achieve the moving parts of the brake. Commonly used buffer device, the annular gap type, adjustable throttle mouth, three types of variable orifice.

1.環狀間隙式：當緩沖柱塞進入與其相配的缸蓋上內孔時，液壓油必須通過間隙才能排出，使活塞速度降低。升降機廠家分析認為，由于配合間隙不變，故緩沖作用不可調，且隨O型圈活塞速度的降低，其緩沖作用逐漸減弱。The annular gap type: when the cylinder head is matched with the buffer plunger into the inner hole, the hydraulic oil must be discharged through the gap to make the piston velocity decrease. Elevator manufacturers believe that, due to the gap with the same, so the buffer can not be adjusted, and with the O ring piston speed reduction, the buffer effect gradually weakened.

2.節流口可調式：當緩沖柱塞進入缸蓋上的內孔時，液壓油必須經過節流閥才能排出。升降機廠家提醒，由于節流閥是可調的，故緩沖作用也可調，但這種調節是緩沖進行前的調節，在緩沖進行中，緩沖作用仍是固定不變的。The throttle adjustable: when the buffer plunger into the inner hole of the cylinder head, the hydraulic oil must be discharged through the throttle valve. Lift manufacturers to remind, because the throttle valve is adjustable, so the buffer can also be adjusted, but this adjustment is the buffer before the adjustment, in the buffer, the buffer is still fixed.

3.節流口可變式：在活塞的軸向上開有三角溝槽，其過流斷面越來越小，緩沖作用隨著速度的降低而增強。升降機廠家介紹，緩沖作用均勻，緩沖壓力較低，氣缸位置精度較高，解決了在行程最后階段緩沖作用過弱的問題。Variable orifice: in the axial direction of the piston has a triangular groove, the flow cross-section is getting smaller and smaller, buffer with the speed of the increase. Elevator manufacturers, the buffer effect is uniform, the buffer pressure is low, the cylinder position accuracy is high, to solve the problem in the final stage of the buffer is too weak.