In-depth Analysis of The "Heart" of BOB-LIFT - Hydraulic System

BOB-LIFT is widely popular for its flexibility and efficiency, and its core power source is precisely the hydraulic system. Power is transmitted through the flow of hydraulic oil to drive every movement of the crane.

I. Basic Components of the Hydraulic System

The hydraulic system of BOB-LIFT is mainly composed of the following key components:

1. Hydraulic pump (power source

Function: Convert the mechanical energy of the engine or electric motor into hydraulic energy to drive the flow of hydraulic oil.

Common types: Gear pumps, plunger pumps (high pressure and high efficiency), vane pumps (smooth and low noise).

The selection of BOB-LIFT: Variable piston pumps are usually adopted, which can automatically adjust the flow rate according to the load demand, and are energy-saving and highly efficient.

2. Hydraulic cylinder (actuator

Function: Convert the pressure energy of hydraulic oil into mechanical energy to drive the extension and retraction of the boom, the extension of the outriggers or the lifting and lowering of the hook.

Key parameters: Cylinder bore, stroke, working pressure (BOB-LIFT typically uses high-pressure oil cylinders with a pressure of 20-35 mpa).

3. Control valve (" nervous system"

Directional control valve: Controls the flow direction of the oil and determines the operation of the crane (such as ascending, descending, and rotating).

Pressure control valve: Prevents system overload (such as when a safety valve releases pressure when it exceeds the standard).

Flow control valve: Regulates the flow rate of the oil and controls the speed of action (for example, when hoisting precision equipment, slow and precise operation is required).

4. Hydraulic oil tank and auxiliary components

Oil tank: It stores hydraulic oil and also serves the functions of heat dissipation and impurity sedimentation.

Filtration: Filter out metal debris and dust from the oil to protect precision components.

Cooler: Prevents performance degradation due to excessively high oil temperature (the viscosity of hydraulic oil decreases at high temperatures, which may cause leakage).

Ii. How does the hydraulic system drive BOB-LIFT?

Take the lifting of the boom as an example. The working process of the hydraulic system is as follows:

Power input: The engine drives the hydraulic pump to pressurize the hydraulic oil in the oil tank and then pump it out.

Oil circuit control: The operator pushes the control valve, and high-pressure oil flows into the rodless cavity of the cylinder (on the piston side).

Execution action: The hydraulic pressure pushes the piston rod to extend, driving the boom to lift.

Return oil circulation: The oil in the rod cavity of the cylinder returns to the oil tank through the control valve, completing the circulation.

Key features

Force multiplication: According to PASCAL's principle, the pressure applied by a small-area piston can generate a huge thrust at the end of a large-area piston.

Stepless speed regulation: By adjusting the opening degree of the valve port, the action speed can be precisely controlled.

Iii. Key Points for Maintaining Hydraulic Systems

Hydraulic system failure is one of the main reasons for the shutdown of BOB-LIFT. Daily maintenance should focus on:

1. Hydraulic oil management

Regular replacement: It is recommended to replace it every 2,000 working hours or once a year (depending on the working conditions).

Oil selection: Use the anti-wear hydraulic oil specified by the manufacturer (such as ISO VG46), and avoid mixing different brands.

Pollution control: Install a filter screen at the fuel tank filling port and regularly check the clogging condition of the filter.

2. Leakage prevention

Common leakage points: cylinder sealing rings, pipe joints, and valve block mating surfaces.

Inspection method: Observe oil stains and conduct regular pressure tests.

3. Temperature control

Ideal oil temperature: 40-60℃ (If the temperature exceeds 80℃, the machine should be shut down to check the cooling system).

High-temperature hazards: Accelerate the oxidation of oil and the aging of sealing parts.

4. Abnormal diagnosis

Slow operation: It may be due to pump wear, excessively high oil viscosity or clogged filter.

Noise and vibration: Check if the oil level is too low and if air has mixed into the oil.

Iv. Future Trends: Smarter Hydraulic Systems

Modern BOB-LIFT is integrating intelligent technologies, such as:

Electro-hydraulic proportional valve: Precisely controls flow and pressure through electrical signals, enhancing operational sensitivity.

Condition monitoring system: Sensors monitor the oil temperature and contamination level in real time and predict faults.

Energy recovery: During braking, the hydraulic motor converts kinetic energy into electrical energy for storage.