Why cabin cabin tilt cylinder crawls at low speed ?


1. The hydraulic cabin tilt cylinder crawls at low speed caused by the material problem of the seals. The commonly used sealing materials for cabin cylinders are NBR, polyurethane rubber, PTFE, etc. Due to the hardness, strength and followability of the material, it directly affects the sliding surface. Friction, and for lip seals, fluctuations in oil pressure cause changes in the contact pressure between the sealing area and the contact surface, resulting in changes in the speed of the cabin tilt cylinder.

2. The influence of the machining accuracy of parts, the machining accuracy of the inner wall of the cabin tilt cylinder and the surface of the piston rod has a great influence on the low-speed stability of the hydraulic cab tilt cylinder. In particular, the geometric accuracy has a greater impact, in which straightness is the key, and the guarantee of straightness is the most difficult to achieve during the machining process. For hydraulic cylinders with long strokes, the straightness of the inner wall of the hydraulic station cylinder and the surface of the piston rod is The main factors affecting the low-speed stability of hydraulic cabin cylinders.

3. The low-speed crawling caused by the existence of gas in the rod cavity and the rodless cavity of the hydraulic cabin tilt cylinder, because the gas is mixed in the hydraulic oil, under the action of pressure, the volume changes, and even under the action of high pressure, gas instantaneously collides, causing hydraulic pressure. The speed of the cylinder is unstable.

4. The low-speed crawling caused by the improper design of the cabin cylinder clearance, the sliding fit clearance between the piston inside the cabin tilt cylinder and the cylinder body, the piston rod and the guide sleeve is too large, causing uneven pressure on the sliding surface, resulting in uneven friction, causing The hydraulic cylinder crawls at low speed; if the sliding fit gap is too small, and there are tolerances in the manufacture of parts, it will also cause uneven pressure on the sliding surface, resulting in uneven friction, causing the hydraulic cylinder to crawl at low speed.

5. Low-speed crawling caused by uneven friction of the guiding elements in the hydraulic station. The commonly used guiding materials for hydraulic cabin tilt cylinders are QT500.7, ZQAL9-4, non-metallic support rings, etc., especially the non-metallic support rings are uneven in size, some non-metallic support rings The size increases or decreases with the change of oil temperature, that is, the poor dimensional stability in the oil directly causes the change of the fitting clearance, which can easily cause the speed of the hydraulic cabin tilt cylinder to be unstable.