The main reason for the expansion of the cylinder wall of the four-column hydraulic press

(1) The strength and rigidity of the hydraulic cylinder of the four-column hydraulic press itself are not strong

According to the theory of uniformly distributed load in material mechanics, the strength and stiffness are distributed in a parabolic state, which is proportional to the uniform pressure of the working oil pressure, and proportional to the 4th power of the uniformly distributed load length. Therefore, the expansion of the cylinder wall is the largest It is easy to occur in slender cylinders, and the expansion position is often near the midpoint of the highest working pressure cavity. In the design, special attention should be paid to the strength and rigidity of the check cylinder.

(2) Abnormal high pressure during the working process of the four-column hydraulic press

① A piston with a large load or high speed has a large inertial force. When it suddenly stops in an instant, the pressure value in the working chamber increases immediately, even several times higher than the maximum working pressure, causing the cylinder bore to expand.

②The hydraulic cylinder is often overloaded. For example, when the baler is about to end, suddenly stops, and then restarts the baling (commonly known as cold baling), which will cause the instantaneous oil pressure to exceed 2 times, which will easily cause the cylinder bore to expand.

③ The buffer device does not work at all and is in a fully open state, so that the running piston cannot decelerate and suddenly hits the cylinder head and may bounce back, causing instantaneous overpressure in the working chamber.

(3) The material of the cylinder barrel is inferior or the structural design of the cylinder body is unreasonable

The misuse of low-strength steel for the cylinder barrel reduces the yield point and safety factor. After a long period of normal use, the cylinder diameter will inevitably expand. For the cylinder wall of the hydraulic cylinder with a large length, the reinforcing hoop is not provided at the middle position of the outer ring, resulting in the inability to bear the load force.

The sharing of the reasons for the expansion of the cylinder barrel of the four-column hydraulic press is here. The expansion of the cylinder wall of the hydraulic cylinder will cause leakage and affect the normal operation of the four-column hydraulic press. Therefore, the operator should operate according to the rules in daily life and strengthen the daily maintenance work. ; Apply a reinforcement structure to the cylinder wall of the hydraulic cylinder; if the inner diameter is measured and deformed greatly, reinforcement measures should be taken first, and the grinding method is generally used for the repair of the inner wall. This article is from the official website of the manufacturer WORLD Press Machine www.pressmachine-world.com, please indicate the source for reprinting!