Slitting Line

TECHNICAL SPECIFICATION FOR

TYPE XBJ1-05/05 SLITTING LINE FOR TRANSFORMER LAMINATION

1. General:

This slitting line is special equipment for slitting silicon steel coil into strips.

Requirements for the coil:

Coil thickness                                                                                 0.23~0.35mm;

Coil inside diameter                                                                        Φ500~508mm;

Coil outside diameter                                                                      Φ1000 mm;

Coil width                                                                                       Max. 1000 mm

Coil weight                                                                                      Max. 5000kgs

Process Description

The silicon steel sheet coil is placed on loading/unloading trolley by a hoist, elevated to appropriate position by the trolley and pushed into the spindle of decoiler manually.

The steel sheet is threaded into slitter through guiding device in buffer pit, stationary and movable guiding devices. A pair of driving rolls after rolling cutter draws to shear the steel sheet into desired strip width.

The two waste edges can be guided to edge cropping shear (optional) and become scraps, which then fall into dump trolley through conveying chutes.

Up to 10 strips are sent to the second buffer pit through driving roll and then the tensioner through detecting device. Detecting device is used to detect the position of steel strips in No.2 pit. When one of the steel strips reaches the top level, the proximity switch on detecting bar can send a signal to decrease the winding speed and detecting bar will fall gradually. When the detecting bar reaches the lowest level (i.e., around 100mm above the pit bottom), the proximity switch on the detecting bar will send a signal to raise the speed of rewinder and the detecting bar raises gradually.

The steel strips are sent to one of 4 jaws of winding mandrel of the winder through tensioner, then the mandrel expands to close the jaw and nip the strip head. When the winding is finished, a pressing block goes down to press the strips to avoid coil loosing. The final steel coils are loaded onto the discharging trolley and then pulled out.

2. Main Technical Parameters

Material                                                       Crystal grain oriented or non-oriented silicon steel sheet coil

Thickness of the steel sheet                                                0.23~0.35mm

Internal diameter of mill coil                                               Φ500mm

Width of mill coil                                                                Max.1000±1mm

Weight of mill coil                                                               Max. 5000kg

Number of strips                                                                Max. 10 strips

Strip width                                                                          40~1000mm, step-less

Diameter of shearing blade shaft                                         Φ125mm

Diameter of shearing blade                                                  Φ250mm

Shearing speed                                                                    Max. 50m/min.

Width of blade                                                                    Approx. 85mm

Width of waste edge                                                           5~10mm

Strip burr                                                                            ≤0.02mm

Straightness deviation of each edge                                     ≤0. 2mm/2m

Accuracy of strip width                                                     ±0.1mm

Installed power                                                                   37kw, 380V(3 phases), 220V(1 phase), 50Hz

Hydraulic pressure                                                             Max. 6Mpa, normally 2~5 Mpa

Operating side                                                                     Left or right side upon request of client

3. Components

Loading trolley                                                                    1 unit

discharging trolley                                                               1 unit

Decoiler                                                                               1 unit

Feed Adjusting Device                                                        1 unit

Stationary Guiding Device                                                  1 unit

Movable Guiding Device                                                    1 unit

Slitter                                                                                  1 unit

Length-Measuring Device                                                   1 unit

Edge Cropping Shear                                                          1 unit

Detecting Device                                                                1 unit

Tensioner                                                                            1 unit

Rewinder                                                                            1 unit

Hydraulic Station                                                               1 unit

Electrical Control System                                                   1 unit

Blade                                                                                   20 units

4. Technical Description

4.1 Loading/unloading trolley

The loading/discharging trolley consists of a hydraulic cylinder driven scissor type mechanism and a base frame with 4 wheels. The elevation is obtained through the cylinder driven scissor type mechanism and the horizontal moving is manually driven.

Load:                            Max. 5000 kg

Stroke                           350 mm

4.2 Decoiler (Hydraulic Driven)

The decoiler consists of the hydraulic mandrel, AC motor, coupling, gearbox, hydraulic cylinders and decoiler base. The T type gliding blocks can move forward and backward inside the mandrel, which drives taper-gliding blocks and 4 arc plates to expand and/or retract the mandrel. Load: Max. 5000 kg, Expansion range of mandrel: 460~520 mm

4.3 Feed Adjusting Device

This device is designed to measure the level of silicon steel sheet in the first buffer pit. There are 2 photoelectric switches and 1 proximity switch in the pit. When the steel sheet is under lower photoelectric switch, the photoelectric switch sends signal to slow down the decoiling; When the steel sheet is above upper photoelectric switch, the photoelectric switch sends signal to speed up the decoiling; When the sheet touches the proximity switch in pit bottom, the decoiler will stop.  This device could help keep synchronization between decoiler and slitter.

4.4 Stationary Guiding Device

This device guides the silicon steel sheet from No.1 pit. It consists of support roll and baffle disk. Adjust the gap between steel sheet and the baffle disk to keep the gap in the range of 0.5~1.0mm.

4.5 Movable Guiding Device

This device consists of base frame, guiding wheel, leading screw, hand wheel, movable carrier, pressing plate, guide rails and so on. The device is hung to the slitter to guide the silicon steel sheet into slitter.

4.6 Slitting Unit

Slitting unit consists of main body, bearing seat, 2 cutter shafts, 2 driving rolls, gearbox, driving clutch, cutter discs and motor etc. Carbide blades are fixed on cutter shafts. The cutter shaft and driving roll are driven by motor through gearbox and driving clutch. By means of rotation of both upper and lower cutter, the silicon steel sheet is slit into steel strips. Cutter disc’s each sharpening interval shall be at least 10,000 meters.

Cutter discs:

Inner shaft diameter                           125 mm

Outer diameter                               250 mm

Material                                    Cemented Carbide

4.7 Length-Measuring Device

The device can ensure desired shearing length of steel strip to meet user’s requirement. Prior to operation, the user inputs the required strip length at operating console and the proximity switch sends signal and counter begins to count, the indicator will show the length of steel sheet being slit. Once it reaches the preset length, the line stops automatically.

4.8 Edge Cropping Shear

Two waste edges are guided to the inlet of the cropping shear through conveying chutes and to be cut into scraps. The shear is driven by a pair of pulleys.

4.9 Detecting Device

Detecting device is used to detect the level of steel strips in No.2 pit. When any one of the steel strips reaches the top level, the proximity switch on the detecting bar sends signal to decrease the winding speed and detecting bar falls gradually; When the detecting bar reaches the lowest level (i.e., about 100mm above the pit bottom), the proximity switch sends signal to increase the winding speed and then detecting bar rises gradually. Therefore when detecting device is working, the detecting bar always swings up and down to adjust the winding speed.

4.10 Tensioner

The infeed side of the tensioner is a strip diverting roller, on which up to 11 diverting trays can be mounted to separate slitted strips. The diverting trays can slide on the spindle to the desired positions and fixed onto the spindle by fastening screw. Then the strips can be guided into pressing plates between upper and lower crossbeam so that the strips can be sent to the mandrel of the rewinder accurately. The lower crossbeam rises by a hydraulic cylinder to nip the silicon steel strips. There is an airbag under upper pressing plate to make the press even.

4.11 Rewinder

The rewinder consists of expandable hydraulic mandrel, AC motor, coupling, gearbox, hydraulic cylinder, pressing roll and base frame. There are T-shape guiding blocks that can move forward and backward inside the hydraulic mandrel. T-shape guiding blocks drive taper guiding blocks and 4 arc segments of the mandrel can be expanded and/or retracted.

A pressing roll is attached to the rewinder to prevent the final strip coils from loosing.

Load:                                                                              Max. 5000 kgs

Expansion range of mandrel                                          480~500 mm

4.12 Hydraulic Station

Hydraulic station consists of oil tank, oil pumps, motors, oil valves, accumulators, filters and pipelines, etc.

System pressure: P₂＝4Mpa;

Decoiler pressure: P₁＝4Mpa;

Tensioner pressure: P₆＝0.8～1.2Mpa;

Rewinder pressure: P₄＝4Mpa;

Slitter pressure: P₃＝2.5Mpa.

4.13 Electrical Control System

Electrical control system consists of electrical control cabinet and operating console. Decoiler, slitter and rewinder are controlled by AC vector converter and motor and they are in synchronized speed. The speed is steplessly adjustable in the range of 0~50m/min. The slitting line is centralizing controlled by Mitsubishi PLC to ensure high reliability. 

5. List of Accessorial Consumable Parts and Tools

5.1 Accessorial Consumable Parts list

5.2 Tool list