Repair methods for pneumatic cylinder leakage
To understand the repair methods for pneumatic cylinder leakage, first of all, we need to know what its specific components are, the basic components, and the working principle of the cylinder:
Taking the single-piston rod double-acting cylinder, which is the most commonly used in pneumatic systems, as an example, the typical structure of the cylinder is shown in the following figure. It is composed of a cylinder barrel, a piston, a piston rod, a front end cover, a rear end cover, and seals, etc. The interior of a double-acting cylinder is divided into two chambers by a piston. A cavity with a piston rod is called a rod-filled cavity, and a cavity without a piston rod is called a rod-free cavity.
When compressed air is input from the rodless chamber, the rod-filled chamber exhausts. The force formed by the pressure difference between the two chambers of the cylinder acting on the piston overcomes the resistance load to push the piston to move, causing the piston rod to extend. When air enters the rod cavity and exhausts the non-rod cavity, retract the piston rod. If the rod chamber and the rodless chamber alternate in intake and exhaust, the piston achieves reciprocating linear motion. The working principle of the cylinder: Pressurized air causes the piston to move. By changing the direction of air intake, the direction of movement of the piston rod is also altered.
Diagnosis and Maintenance Tips for Common Faults of Pneumatic Cylinders
Good pneumatic cylinder
1. Tightly block the air hole with your hand, then pull the piston shaft with your hand. When pulling, there is a strong reverse force, and when releasing, the piston will automatically spring back to its original position. Pull out the push rod and then block the air hole. When pressing the push rod by hand, there is also a large reverse force. When releasing, the piston will automatically spring back to its original position.
2. Faulty pneumatic cylinder
When pulling, there is no resistance, or the force is very small. When releasing, the piston does not move or moves weakly and slowly. When pulling out, there is a reverse force, but it gradually decreases when pulling continuously. When pressing, there is no pressure or the pressure is very small. There is pressure, but the pressure gets smaller and smaller.
3. Generally, magnetic switches are not prone to failure. However, in actual operation, we often encounter the phenomenon that the magnetic switch does not work and has no signal output. This is because the installation position of the magnetic switch has changed, causing it to fail to sense the magnet in the cylinder. Therefore, it is necessary for us to frequently check whether it is tightened.
We do not recommend repairing pneumatic cylinders. However, sometimes for emergency use, we suggest that simple repairs be carried out for phenomena such as air leakage, no movement, slow movement, or air leakage in pneumatic cylinders.
First, use a retaining ring plier to remove the retaining ring (screw) at the tail of the cylinder. Then, take out the cylinder piston. There will be a rubber ring on the piston. Generally, if the cylinder does not move, moves slowly, or has gas leakage, it is caused by excessive wear of this rubber ring. Remove the rubber ring, then install a new one. Finally, clean the cylinder body thoroughly and ensure that the two air inlets are unobstructed. After everything is fine, apply a small amount of uncontaminated grease to the inner wall of the cylinder block and then install the retaining ring at the tail of the cylinder. Generally, after this repair, the service life of the cylinder can be extended by one to two years.
Equipment lies in maintenance, not in repair. If it is well-maintained on a regular basis, there will be no need for repair.
Take good care of your equipment, maintain and wipe it frequently to keep it clean.
2. Do not overload the equipment or use it in violation of regulations.
3. In case of malfunction, be patient in troubleshooting and do not use brute force or violence.
4. Fine components should be maintained carefully. Do not use blunt or sharp objects to strike or poke the equipment.
5. Complete preparation of vulnerable parts and fast update of drawings can significantly shorten the maintenance time limit.
6. Observe the operation status of the equipment frequently in daily life to prevent equipment malfunctions.
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