Rubber lining construction

1. Preparation and application of rubber cement

1.1 Before preparing the rubber cement, the accelerator must be fully stirred evenly (without sediment), otherwise it will seriously affect the bonding effect.

1.2 Preparation ratio of rubber cement:
Mix 100 parts of solvent, 9 parts of accelerator, and 3 parts of curing agent in a container and stir evenly. (100:9:3)

1.3 The prepared rubber cement should be used up within 5 hours.

2.1 Application of adhesive

2.1.1 On the substrate that has met the requirements, first use sandblasting equipment to blow away dust, and then use a cloth to remove residuals.

2.1.2 Under the temperature and humidity specified in the process specification, apply the specified primer as required. After the drying time of the primer reaches the requirements of the specification, apply the first layer of specified adhesive.

2.1.3 According to the shape of the area to be lined on the equipment, cut the rubber sheet. Then, depending on the workload of the day, apply the specified bonding agent to the rubber-lined equipment substrate and rubber sheet.

2.1.4 The application of the bonding agent should be done as evenly as possible without dripping, flowing, missing spots, or unevenness.

2.2 Rubber lining (bonding to steel)

2.2.1 Lay the cut rubber sheet flat (without tension or stretching) on the substrate, gently press it with your hand, and then use a roller to roll the rubber sheet to adhere it to the substrate. Use a small roller to slightly press the seams and corners.

2.2.3 Rubber lining seams: The overlapping seams of single-layer rubber lining should be staggered to avoid cross-shaped overlapping seams; for double-layer rubber lining, the seams of the second layer of rubber sheet should be staggered from the first layer by at least 100mm.

2.3 Defect inspection and treatment

2.3.1 Defect treatment: During the rubber lining process, any bubbles or翘边 in the overlap should be immediately addressed.

2.3.2 Bubble treatment: Use a syringe to draw out the air inside the bubble, re-compact it with a roller, and seal the needle hole with glue.

2.3.3 Overlap翘边treatment: First, use a knife dipped in a small amount of diluent to gently expand the翘边. Then, apply the bonding agent, and after the drying time is reached, use a small roller to press it.

2.4 Special situation handling

Due to the fixed state of the equipment, sandblasting cannot reach the root of the lower scaffolding. Therefore, a polishing machine is used to grind it to meet the standards. If the movement of the scaffolding damages the primer, clean the damaged area and repaint the primer.

3. Inspection of the appearance quality of rubber lining:

3.1 The surface of the rubber lining should be free of bulges, and any bulges should be promptly addressed.

3.2 The surface of the rubber lining may have impressions caused by the adhered lint of the padding fabric, wrinkles in the padding fabric, or water ripples caused by pressing, but the thickness of the rubber lining at these locations should be within the specified tolerance range.

3.3 Inspection with a 90-degree bend should reveal no cracks.

4. Application of rubber lining and cutting of rubber sheets:

4.1 Application of rubber cement: Mix the rubber cement evenly before application. The entire application process should maintain a uniform thickness of the coating without missing spots or wrinkles. When applying with a brush, prevent accumulation, flowing, and bubbling of the rubber cement. If bubbles are present, puncture them and then apply another coat of rubber cement to the affected area. Generally, the thickness of each coat of rubber cement is 0.08~0.1mm, and the total thickness of three coats on a metal surface is about 0.2~0.3mm.

4.2 Cutting of rubber lining: The shape and size of the rubber lining should be cut according to the dimensions and shape of the equipment, and it should be convenient for construction and material conservation. Therefore, the following points should be noted when cutting rubber lining:

4.2.1 When cutting, pay attention to the requirements of the drawing and the structural characteristics of the rubber lining layer. Leave sufficient width for overlap and ensure a tight fit at the interface.

4.2.2 Make full use of the rubber lining while minimizing the seams.

4.2.3 The cutting should be done on a dedicated workbench. Before cutting, the quality of the rubber lining should be carefully inspected, and any bubbles should be punctured with a needle for repair. The workbench can be a wooden structure with a width of 1.5m and a length of 8-10m, and the surface should be covered with steel or aluminum plates.

4.2.4 After cutting, the rubber lining should be of uniform width, and the edges should be beveled with a knife. The width of the bevel should be 2-3 times the thickness of the rubber lining. Beveling (edging) is crucial to ensure the quality of the lining layer, as it aims to make the seams tight and prevent them from coming apart after presulfidation. If there is residual air at the overlap of the rubber sheets that have not been beveled, it will cause blisters during vulcanization.

5. Conduct electric spark testing after completion of the construction.

6. Ensure that the electric spark tester has sufficient power and is operating normally.

7. Perform electric spark scanning on all rubber-lined surfaces, and immediately inspect and repair any abnormalities that are detected.