How to choose suitable spare parts for papermaking equipment?

When selecting spare parts for papermaking equipment, the key points are machine type matching, material technology, working condition adaptation, and reliable suppliers. If you choose directly according to the following process, you won't step on the pit.

First, make clear three basic information.

Equipment information

Equipment model, manufacturer and factory year

Drawing number, part number and assembly position

Working condition

Speed, capacity, paper type

Temperature, humidity, pH, slurry abrasiveness

source of damage

Wear, corrosion, fatigue, impact, seal failure

Is it normal wear and tear or installation/lubrication/operation problem?

Second, the key points of selecting spare parts by parts

1. Spare parts for forming department (mesh department)

Forming net, baffle, nozzle, water suction box panel, sealing strip

Key points:

Mesh, air permeability and material should match the speed and paper type.

The panel is wear-resistant, low friction and corrosion-resistant.

2. Press spare parts

Press roller, boot cover, felt, suction roller, sealing element and bearing.

Key points:

Roll surface hardness, adhesive layer material and oil resistance.

Wool cloth is breathable, dehydrated, wear-resistant and easy to clean.

3. Drying cadre spare parts

Drying cylinder, cylinder head, steam head, rotary joint, steam trap, high temperature seal

Key points:

High temperature resistance, pressure resistance, no steam leakage and good heat conduction.

Rotating joints must be of the same model and size.

4. Spare parts for calendering/coiling department

Calendering roller, bearing, pneumatic tire, clutch, brake, tension controller.

Key points:

Dynamic balance, surface accuracy, coaxiality

Pneumatic tires are pressure-resistant and aging-resistant.

5. Slurry pumps, pumps and dilution systems

Mechanical seal, impeller, pump shell, O-ring, coupling

Key points:

Wear and corrosion resistance (stainless steel/rubber/ceramic)

Sealing material matching medium (clear water/slurry/white liquid)

6. Gears, reducers and transmission parts

Gears, bearings, oil seals, chains, belts

Key points:

Precision grade, heat treatment hardness, lubrication mode

Must be replaced by the original factory or the same level.

Three, four hard criteria for selecting spare parts

dimensional accuracy

Tolerance, fit and installation distance must be consistent, otherwise it will not be installed/damaged easily.

Material standard

Wear resistance: high chromium, ceramics, polyurethane.

Corrosion resistance: 304/316/dual phase steel/rubber

High temperature resistance: fluororubber, PTFE, metallic graphite.

Reliable process

Casting/forging, surface treatment, dynamic balance and flaw detection shall be qualified.

interchangeability

Can be directly replaced, without changing holes, turning or welding.