Causes and Solutions for Foreign Objects in the Hydraulic Cylinder of a 1000-ton Hydraulic Press

**I. Foreign Objects Entering the Hydraulic Cylinder from the Hydraulic System**

1. Inadequate pipeline cleaning: After production, hydraulic oil pipes should undergo acid cleaning and be soaked in hydraulic oil. During installation, precautions must be taken to prevent dust or impurities from entering.

2. Unclean hydraulic oil tank: Post-welding, the hydraulic oil tank should be thoroughly cleaned and undergo acid treatment. Removal of welding slag and dust is crucial to prevent these impurities from entering the hydraulic cylinder with the hydraulic oil.

3. Oil sludge due to prolonged high-temperature exposure: High temperatures can lead to oil sludge formation. If the filtration system malfunctions or is not regularly cleaned, oil sludge may enter the hydraulic cylinder.

**Solution:**

1. Manufacturers should clean hydraulic pipelines and tanks according to specifications to prevent impurities from entering the hydraulic cylinder during installation.

2. Regularly filter and change hydraulic oil to prevent excessive impurities from damaging the hydraulic cylinder.

**II. Generation of Foreign Objects During Hydraulic Cylinder Movement**

1. Formation of iron or iron debris due to friction and cushioning of the piston rod. The small clearance in the cushioning device, coupled with significant lateral loads when the piston rod passes through, may result in sintering and the creation of iron debris, which remains in the hydraulic cylinder.

2. Scratching of the cylinder inner wall: High pressure on the piston's sliding surface causes sintering. Friction with the cylinder's inner surface can cause metal to crack and remain in the hydraulic cylinder.

3. Aging of seals leading to wear on the piston rod: Worn seals may result in contact between the sealing ring and hydraulic oil, causing part of the seal to enter the hydraulic cylinder.

**Solution:**

1. Design and adjust the cushioning device's clearance properly to prevent unnecessary friction.

2. Regularly check for scratches on the inner wall of the hydraulic cylinder, and perform maintenance as needed.

3. Periodically inspect seals, replacing aged ones to prevent their entry into the hydraulic cylinder.

**III. Entry of Foreign Objects from the External Environment**

1. Lack of tank sealing: In environments with high dust levels, dust can enter the tank, leading to an excessive amount of impurities in the hydraulic oil or causing oil deterioration.

2. Improper packaging during equipment transportation or installation: Inadequate packaging of hydraulic pipelines, tanks, and valve blocks may allow dust or foreign objects to enter the hydraulic system during transportation or installation.

**Solution:**

1. Implement effective dust removal for the 1000-ton hydraulic press and regularly check the hydraulic system's seal integrity.

2. Ensure proper packaging during equipment transportation, especially for hydraulic pipelines and pump stations, to prevent damage and the entry of dust or impurities. Maintain a clean and sanitary installation environment.