CNC machine tool oil cooler

CNC machine tool oil coolerDesigned around the three major functions of "oil circulation - refrigeration and cooling - precise temperature control", it mainly includes:

Circular system

Oil pump: mostly gear pump or screw pump (flow rate 10-100L/min, pressure 0.2-0.5MPa), responsible for delivering cooling oil to the heating components of the machine tool (spindle, guide rail, etc.), and then returning to the refrigeration unit.

Fuel tank: with a capacity of 5-50L (customized according to the needs of the machine tool), equipped with a built-in filter screen (precision 5-20 μ m) to filter impurities (such as metal debris) in the oil and avoid scratching the components.

Pipeline: Oil resistant rubber pipes or copper pipes (inner diameter 10-25mm) are used to connect the interface between the refrigeration machine and the machine tool, ensuring no oil leakage (pressure loss ≤ 0.05MPa).

Refrigeration system

Compressor: Fully enclosed piston compressor for small machines, vortex compressor for large machines (cooling capacity 0.5-10kW), using R410A or R32 as refrigerant, suitable for cooling needs from -5 ℃ to 40 ℃.

Evaporator: Immersive or shell and tube type (directly exchanges heat with oil), absorbs heat from oil through refrigerant evaporation, and reduces oil temperature (single-stage refrigeration temperature difference can reach 10-15 ℃).

Condenser: air-cooled (with a cooling fan) or water-cooled (connected to a cooling tower), which releases the heat of the refrigerant into the environment, ensuring a continuous refrigeration cycle.

Control system

Thermostat: Digital PID controller (accuracy ± 0.5 ℃), can set target oil temperature (such as 25 ℃), monitor return oil temperature in real time and adjust refrigeration power.

Sensor: PT100 temperature sensor (installed at the return port), feedback oil temperature signal; The pressure sensor monitors the oil pump pressure (alarms in case of abnormalities).

Protection devices: compressor overload protection, low oil level alarm, filter blockage alarm, ensuring safe operation of the equipment.

CNC machine tool oil coolerMaintenance details:

Daily cleaning:

Fuel tank cleaning: Open the drain port every 2 weeks to drain oil and remove moisture and impurities from the bottom; Clean the cooling coil every 3 months to prevent scaling from affecting heat transfer efficiency.

Air filter: Clean once every 2 weeks (once a week in harsh environments), using a vacuum cleaner or warm water (≤ 40 ℃) with neutral detergent to avoid dust clogging and affecting heat dissipation.

Oil management:

Regular testing: Check the viscosity and acid value of the oil every 3 months. If it turns black or dirty, it should be replaced immediately to prevent oil blockage or component wear.

Oil level check: Observe the oil level gauge daily to ensure that the oil is within the normal range and avoid damage to the oil pump due to idling.

Electrical system inspection:

Line connection: Check the power and sensor wires for looseness every month to avoid short circuits or signal interference.

Insulation test: Use a megohmmeter every year to test the insulation resistance of the motor (≥ 1M Ω) to prevent leakage or burning.

Key component maintenance:

Compressor lubrication: Check the lubricating oil level of the compressor every six months, and add specialized lubricating oil if it is insufficient to avoid mechanical wear.

Fan bearings: Apply high-temperature resistant grease (such as molybdenum disulfide grease) to the fan bearings every quarter to reduce noise and vibration.

Long term discontinuation treatment:

Drain the coolant: Drain the coolant from the condenser before shutting down in winter to prevent freezing and cracking.

Moisture proof treatment: Apply moisture-proof treatment (such as rust proof oil) to the electrical control box to prevent moisture and short circuits.