For the manufacturing of inclined-insertion fin evaporators used in refrigerators, we provide complete automated production line solutions covering key processes including aluminum tube forming, fin stamping, automatic fin loading, tube insertion and expansion, automatic welding, online leak testing, drying, and nitrogen charging with pressure holding.

Main Technical Specifications

Material	Φ8 mm aluminum tube.
Production Mode	Multiple single-station machines connected sequentially according to the production process.
Power Supply	380V, 50Hz, three-phase five-wire system with protective grounding.
Air Supply	≤0.6 MPa; (3.5 MPa compressed air for leak testing, and 99.999% high-purity argon gas for welding).
Water Supply	Cooling water for welding and deionized water for leak testing.
Equipment Color	According to the color standard provided by the customer.

Complete Production Flow

Fin Stamping → Tube Bending → Fan-Shaped Tube Twisting → Folding → Resistance Welding → Fin Arrangement & Tube Expansion → Tube Bending → Side Plate Assembly → Argon Arc Welding → Accumulator Tube Assembly → Water Leakage Test → Heating Oven → Appearance & Tube Diameter Inspection → Cap Installation → Nitrogen Charging → Transfer Cart Placement

Scope of Supply (Including but not Limited to the Following Equipment)

No.	Equipment Name	Qty	Function	Status
1	Fully Automatic Tube Bending Machine (1-to-10)	1	Automated uncoiling, straightening, cutting, and bending of aluminum tubes	New
2	Twisting, Angling & Flattening Machine	1	Integrated post-forming processing of bent tubes	New
3	Tube Folding Machine	1	Precision folding of angled-insertion evaporator tubes	New
4	High-Speed Fin Punching Press (YKC-24-63)	1	High-speed fin production	New
5	Automatic Fin Placement & Tube Expansion Machine	2	Automated fin insertion and tube expansion assembly	New
6	Automatic TIG Welding Machine	2	Body-to-accumulator welding	New
7	Resistance Welding Machine	2	Body-to-pipe resistance welding	New
8	Side Panel Assembly Machine	2	Automatic side panel installation	New
9	Tail Pipe Bending Machine	4	3-4 bend tail pipe forming	New
10	Water Leakage Test Tank	1	Pressure leak detection	New
11	Drying Oven	1	Degreasing and drying system	New
12	Nitrogen Charging & Pressure Holding Machine	1	Automatic gas charging and sealing	New
13	AC/DC TIG Welding Machine	1	Manual repair welding	New

Main Structural and Technical Description

4.1 Fully Automatic Tube Bending Machine (1-to-10)

Function: Fully automated aluminum tube processing system for uncoiling, straightening, cutting, and precision bending.

Key Features:

Control System: PLC + 7-inch color touch screen

Output: 10 tubes per cycle

Tube Capacity: Φ8mm smooth and internally grooved aluminum tubes

Bending Range: 140-750mm outer dimensions

Performance Specifications:

Parameter	Specification
Bending Radius	R11mm (centerline)
Row Spacing	22±0.2mm
Dimensional Tolerance	±1.5mm
Straightness	≤1%
Roundness	±0.2mm
Tube Deformation Rate	≤10%
Flat Diameter	≥6.7mm
Convex Diameter	≤8.3mm
Pass Rate	≥99%

Main Components:

Internal extraction feeding rack (3-layer capacity)

Machine frame with stress-relief treatment

Primary feeding and cutting device

Secondary servo-driven feeding system

Hydraulic bending device with Φ1400mm rotating table

Pneumatic discharge mechanism

PLC control system with 400 program storage capacity

Quality Standards:

Smooth arc bending without sharp angles or irregular bends

No burrs on tube ends

Surface free from indentation marks (depth <0.1mm)

Consistent elbow spacing and alignment

4.2 Twisting, Angling & Flattening Machine

Function: Integrated post-forming processing equipment for twisting, angling, and flattening operations on bent aluminum tubes.

Performance Specifications:

Parameter	Specification
Tube Range	140-750mm outer dimensions
Single-side Elbow Capacity	30 pieces
Twist Angle	30°±1° (0-45° adjustable)
Flattening Rows	7.5 rows
Flattening Thickness	5.6-6.4mm
Pass Rate	≥99%

System Components:

Box-type machine bed with precision linear guide rails

Double hydraulic cylinder flattening mechanism

Hydraulic-driven twisting mechanism with gear-rack transmission

Hard nylon-embedded twisting shaft for tube protection

Pneumatic tube support system

Safety light curtain protection

PLC + touch screen control

Safety Features:

Light curtain protection with 3-second delay restart

Action interlock logic prevents misoperation

Real-time alarm and status display on touch screen

4.3 Tube Folding Machine

Function: Precision folding of aluminum tubes for angled-insertion evaporators.

Specifications:

Parameter	Value
Tube Diameter	Φ8mm
Bed Construction	Aluminum profile with machined table surface
Drive System	Pneumatic cylinder with gear-rack transmission
Adjustment	Manual height and angle fine-tuning

Key Features:

Quick and reliable pneumatic actuation

Manually adjustable folding mold height

Fine-tunable folding angle

Product-specific configuration

4.4 High-Speed Fin Punching Press (YKC-24-63)

Function: High-speed production of evaporator fins for refrigerators.

Press Specifications:

Parameter	Value
Model	YKC-24-63
Capacity	630kN
Stroke Rate	150-300 SPM (variable)
Slide Stroke	40mm
Mold Height Adjustment	50mm
Worktable Size	900×1350mm
Feed Pitch	0-100mm

Decoiler Specifications:

Single-head internal expansion type

Maximum coil diameter: Φ1000mm

Coil inner diameter: Φ150±5mm

Maximum material width: 550mm

Electronic sensor-based feeding control

Fin Adsorption System:

Single fan with automatic vacuum damper

Suction cup length: 1000mm

Frequency converter-controlled suction force

Dual-position automatic rotating collection

Control System:

Mitsubishi PLC, frequency converter, and HMI

Automatic cycle operation

Fault detection and display

Periodic counting for production control

Premium Components:

American ROSS clutch valve

Mitsubishi PLC and controls

French TE electrical components

Japanese Sanyo Shoji pneumatic brake

Japanese IKO bearings

4.5 Automatic Fin Placement & Tube Expansion Machine (2 units)

Function: Automated fin insertion and tube expansion assembly for angled-insertion fin evaporators.

Performance Specifications:

Parameter	Value
Aluminum Tube Grade	1070/1060/1050/1100, "O" state
Tube Diameter	Φ8mm
Tube Wall Thickness	0.6-1.0mm (including internally grooved)
Fin Material Grade	1070/1060/1050/1100/3102, "O" state
Fin Width	50mm, 60mm, 75mm
Fin Thickness	0.13-0.2mm
Fin Types	1-5 types
Storage Capacity	5-layer warehouse system
Configuration	One-out-two
Efficiency	500 sets/shift (10.5 hours)
Pass Rate	≥99%

System Components:

Machine frame with safety guardrail and light curtain

5-layer automatic fin storage and placement system

Servo-driven fin placement rack

Automatic pressing mechanism with lighting

Hydraulic tube expansion mechanism

Automatic demolding system

PLC + touch screen control with USB expandability

Key Features:

Multi-point suction cup system with separate group control

Cr12+ hardened fin molds

Precision positioning with replaceable wear-resistant sleeves

Ergonomic manual tube threading design

Automatic material detection and status monitoring

Quality Requirements:

No missed, wrong, multiple, or ejected fins

Precise fin mold positioning with <450mm clearance

Surface free from scratches and marks

Pass rate ≥99%

4.6 Automatic TIG Welding Machine (2 units)

Function: Automated tungsten inert gas (TIG) welding for evaporator body-to-accumulator/pipe joints.

System Components:

Aluminum profile machine bed (welded box construction)

Servo motor-driven spindle transmission

Welding torch bracket with linear guide

Pneumatic torch advance mechanism

3-axis torch micro-adjuster (≥50mm adjustment range)

Touch screen operation interface

Arc shielding panels

Key Features:

Harmonic-interference resistant servo motor

Stepless speed control with high torque

Dovetail slide with locking function

Multi-directional torch positioning

Automatic positioning, welding, and return sequence

Process parameter simulation mode

4.7 Resistance Welding Machine (2 units)

Function: Copper-aluminum resistance welding for evaporator body-to-pipe joints.

Specifications:

Parameter	Value
Welding Type	Resistance welding
Material Combination	Copper-Aluminum
Design	Stationary workpiece, moving die

Operation Sequence:

Workpiece placed on welding fixture

Foot pedal activated

Vertical cylinder auto-clamps workpiece

Horizontal cylinder auto-feeds aluminum tube

Resistance welding process auto-executes

Manual workpiece removal

4.8 Side Panel Assembly Machine (2 units)

Function: Automated assembly of side panels to finned evaporator bodies.

Specifications:

Parameter	Value
Application	50mm fin pitch evaporators
Bed Construction	Aluminum profile and plate assembly
Die Material	PP nylon (precision machined)
Press Mechanism	Large-bore cylinder with linear guide

4.9 Tail Pipe Bending Machine (4 units)

Function: Final bending operations on evaporator tail pipes.

Specifications:

Parameter	Value
Platform Size	1000×600mm (approx.)
Tube Diameter	Φ8mm (smooth & internally grooved)
Bed Construction	Aluminum profile box design
Platform Design	Flexible with threaded hole array
Bend Capacity	3-4 bends per workpiece
Drive System	Pneumatic cylinder with gear-rack mechanism

Key Features:

Product-specific dedicated machines (non-universal)

Accommodates different evaporator sizes

Customized for each product model

4.10 Water Leak Test Tank

Function: Dedicated pressure leak detection for angled-insertion evaporators.

Specifications:

Parameter	Value
Tank Dimensions	1200×600×250mm (L×W×D)
Tank Material	Stainless steel
Test Pressure	3.0 MPa
Overall Dimensions	1600×2000×2000mm (L×W×H)
Bed Construction	Aluminum profile box design

Operation Sequence:

Operator attaches test fixture to evaporator pipe ports

Press START button

System auto-pressurizes to test pressure

Hold time countdown

Pass: Green light + "OK" display → Remove workpiece

Fail: Red light + "NG" display + audible alarm

Control System:

Digital pressure sensor connected to PLC

Automatic leak detection algorithm

Visual and audible alarm system

Additional Equipment:

Midea water purifier included (supports both angled and straight-insertion lines)

4.11 Drying Oven

Function: Degreasing and drying system for fin evaporators with high-temperature convection.

Drying Section Specifications:

Parameter	Value
Heating Section Length	10m (5 sections × 2m)
Inner Width	1000mm
Inner Height	200mm
Temperature Range	Room temp - 200°C (adjustable)
Operating Temperature	150°C
Heating Power	24 × 1.5kW
Heating Elements	Near-infrared high-temp resistant light wave tubes
Circulation Fans	5 units × 300W

Conveyor System:

Parameter	Value
Total Length	12.5m (1m feed + 10m heat + 1.5m discharge)
Belt Width	1000mm (inner net)
Belt Material	High-temperature resistant stainless steel
Linear Speed	4-15 m/min (VFD controlled)
Motor Power	2.2kW with frequency converter
Workpiece Height	900mm from ground

Construction:

Outer shell: 1.5mm cold-rolled steel

Inner liner: 1.2mm 304 stainless steel

Insulation: 150mm thick 120K mineral wool

Temperature control: 5-zone independent PTD control

Cooling: 2 × 80W cross-flow fans

Smoke exhaust system included

4.12 Nitrogen Charging & Pressure Holding Machine

Function: Automated nitrogen charging and pressure holding for fin evaporators.

Specifications:

Parameter	Value
Charging Pressure	2.0 MPa
Gas Type	Nitrogen (99.999% purity)
Control	Solenoid valve with fixed quantity

Operation Sequence:

Manually position workpiece in fixture

Insert cap after positioning

Automatic nitrogen charging (fixed quantity)

Fixture opens automatically

Manual workpiece removal

4.13 AC/DC TIG Welding Machine

Function: Manual repair welding for leak detection failures.

Specifications:

AC/DC TIG welding capability

Portable for on-site repairs

Adjustable welding parameters

Main Component Configuration Requirements

Component	Required Brands	Criticality
FRL Units, Solenoid Valves	SMC / FESTO / AirTAC	Critical
Linear Guides, Blocks, Ball Screws	HIWIN / YYC	Critical
PLC, Servo Motors, Touch Screens	Mitsubishi / Siemens	Critical
Variable Frequency Drives	Mitsubishi / Siemens	Critical
Motors, Reducers	SEW / Shengbang / Taiwan ATL / Wannan / Guomao	Critical
Relays, Buttons, Switches, Indicators, MCBs, Contactors	Siemens / Schneider / Omron / IDEC	Critical
Sensors	Pepperl+Fuchs / Omron / Panasonic / Autonics	Critical