Evotech Pvt. Ltd., Sister Concern of Evcon Technologies, Providers of Evcon Turbo TMT System
Automatic Cooling Bed with Twin Channel
The Automatic Cooling bed consists of two major units:
  • Twin-channel Bar receiving Mechanism
  • Movable Rack Cooling Bed
Automatic Cooling Bed The Twin-channel Bar receiving mechanism is used to collect the TMT bars leaving the Quenching boxes after being sheared by the Flying Shear in two strands. The twin-channel is made out of CI central box, water cooled to prevent warping during rolling, and C-type CI channels which are suspended from a longitudinal structural. The closed C-type channels ensure that the bars do not come out and maintain safety of the personnel.

The opening and closing of these channels is by means of a cam-shaft and follower rollers. After collection of each bar, the bar is dropped onto a fixed CI Straightening rack mechanism one by one, from where it is carried ahead by the Movable rack mechanism. The Twin-channel mechanism is provided along the full length of the Cooling bed. In case of a 54 m long Cooling Bed, the twin-cannel size is also 55 m long. The mechanism is installed about 300 mm above the Straightening racks.

The Twin-channel bar receiving mechanism comprise of the following:
  • Twin water-cooled C-type channels with water cooling arrangement.
  • Supporting arrangement for the twin-channel and drive system.
  • Cam device for opening closing of the pipes.
  • Hydraulic Drive for operation of the cams.
Cooling Bed The purpose of the cooling bed of a movable rack design is to uniformly air-cool the TMT bars and transporting the same in a phased manner from the entry of the cooling bed to discharge side. The front end of the bars are also leveled at the discharge side and a fixed number of bars sent for final length cutting by cold shear and bundling. The Movable rack Cooling Bed will be of a walking beam design. The mechanism shall ensure that the bars are uniformly positioned over the toothed racks. The cooling bed is designed considering the smallest and the maximum size of the bars being rolled, delivered from the finishing mill stand of the mill, and the cooling time required for the various sizes of the bar

Rack type cooling bed design depends on Bars cut previously to given lengths, to slow them down, to transport them crosswise over a cooling surface ensuring that the rolled bars in very wide range of lengths, are kept as straight as possible, to collect the bars at the end of the cooling surface to predetermined packs matched to the requirements of the cold shear, and to discharge finally same onto a roller table which conveys the bar packs to the cold shear.

The Complete system consists of the following:
C.I. Fixed Straightening Racks:
These are Cast Iron toothed blocks, which receive the bars from the Bar Receiving Twin - Channel Mechanism. These racks help to straighten the bars, which are at a temperature of about 600oC.

Movable Rack Mechanism
These are steel fabricated tooth racks which are mounted on Eccentric Rollers to enable them to move in the x and y axis. The Racks shall be profile cut to suit the smallest size of bar (8 mm) and also the max size (25 mm) bars. This mechanism collects the bars from the Fixed Straightening Racks and transfers them towards the delivery side of the Cooling Bed.

Fixed Rack Mechanism
These are also fabricated toothed racks, which receive the bars from movable rack mechanism as the bars are transferred toward the delivery side of the Cooling Bed.

Drive for Movable Rack Mechanism
The drive to the movable rack mechanism will be through two motors driving two parallel sets of drive shafts. Each motor will transmit drive through Two worm Reduction Gear drives. The shaft incorporates eccentrics, which provide the two-axis movement to the movable rack mechanism.

Bar aligning Rollers
Chain driven profile cut rollers which are fitted at the end of the Racks but before the bars leaves the racks are driven by motors to align the bars front end before delivery to the Run-out roller table.

Throw off device
At the end of the collecting grid the bars pack is transported on the Delivery roller table by means of throw off fingers.

Run out Roller Table
Chain Driven roller table at the end of the cooling rack is provided to transport the pack of the bars to the cold shear.

Twin Channel
Process Equipment
The brief equipment list is given below. The detailed equipment list, along with the complete ordering specifications, shall be supplied to the customer after placement of order.

Equipment List
Bar Receiving Twin Channel system:
  • Supporting Structures.
  • CI Twin channel with water-cooling arrangement.
  • Hydraulic cylinders.
  • Cam drive shaft.
  • Hydraulic Power Pack.
Mechanized Automatic Cooling Bed
Fixed Straightening Rack mechanism
- C.I. Racks
Fixed Rack Mechanism
- Fabricated Steel Racks
- Fabricated structure
Bar Leveling Mechanism
- Grooved rollers with chain drive
- Motors
Movable rack Mechanism
- Fabricated Steel Racks
- Fabricated structure
- Drive Shaft with Eccentrics, Gear & Dog couplings, Bearing pedestals, etc.
- Worm Reducers - Motor
Bar Throw Off Device
- Levers
- Drive Shaft
- Worm Reducer
- Motor
Run out Roll Table
- Rollers with chain drive
- Motors
- Bed Plates

Supporting structure