Preventing fatigue damage to stainless steel manual carts requires comprehensive measures from multiple aspects such as design, use, and maintenance. Here is the specific plan:

1、 Core causes of fatigue damage

Material characteristics

Although stainless steel is corrosion-resistant, long-term exposure to alternating stress (such as repeated overloading) can cause micro fatigue, resulting in the formation of pitting and pits on the contact surface, accelerating crack initiation.

Usage habits

Overload: Exceeding the rated load causes deformation of the frame.

Impact load: Sudden acceleration/emergency stop causes uneven stress on the welding area.

Center of gravity offset: The risk of overturning increases due to the uneven loading of goods, indirectly damaging the structure.

environmental factor

Damp environment: Chloride ion penetration causes intergranular corrosion, reducing material strength.

High temperature scenarios: such as kitchen food trucks being exposed to heat sources for a long time, leading to accelerated metal fatigue.

2、 Full cycle protection plan

1. Selection stage

Material upgrade:

Priority should be given to using 316L stainless steel (containing molybdenum element), which has more than twice the resistance to chloride ion corrosion as 304 stainless steel and is suitable for coastal or high humidity environments.

Structural design:

Using mortise and tenon frame instead of welding to eliminate stress concentration points.

Thicken key load-bearing components (such as crossbeams ≥ 3mm) to enhance bending strength.

2. Standardized operation

Load management:

Real time monitoring of dynamic weighing sensors (such as installing IoT modules), with over threshold alarms.

The layered trolley is loaded according to the principle of "heavy at the bottom and light at the top", lowering the center of gravity.

Mobile skills:

Complex terrain adopts an "S-shaped" path to reduce vertical wheel impact.

When going downhill, the brake should be combined with a constant speed to prevent the vehicle from rolling and impacting the frame.

3. Intelligent maintenance

Digital monitoring:

Install strain gauges on the frame and monitor stress concentration areas through the APP.

Wheel odometer warning (such as prompting replacement after accumulating 100km of rolling).

Lubrication system:

Automatic oil injection device (lubricating bearings quantitatively every 50 hours) to reduce friction coefficient.

Choose food grade silicone grease (for hospital and kitchen settings) to avoid lubricant contamination.

4. Environmental adaptation

Moisture prevention measures:

Install a moisture-proof pad (such as EVA material) at the bottom of the cart to block ground moisture.

Regularly clean the gaps and accumulated water with compressed air.

High temperature protection:

The kitchen trolley adopts a double-layer vacuum insulation layer, which reduces the surface temperature by 30% -40%.

Spray high temperature resistant coatings (such as ceramic coatings), with a temperature tolerance of up to 400 ℃.

5. Renovation and upgrading

Renovation of old carts:

Install reinforcing ribs (such as triangular support plates) at the welding site to enhance torque resistance.

Replacing the polyurethane elastic wheel improves the shock absorption performance by 60% compared to ordinary rubber wheels.

Intelligent upgrade package:

Install an electronic anti overturning system (using a gyroscope to detect the tilt angle, with a warning response of less than 0.1 seconds).

Modular design (such as quick replacement of countertops of different sizes) extends the lifespan of equipment.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment