Welcome

WelcomeA Presentation on Hydraulic Bar Bending Machine byMiss VinithaMr. Ravi Kumar.SMr. Prasanna.SHydraulic Bar Bending MachineNeed of this ProjectRe-bar stands for reinforcing bars. Concrete is a material that is very strong in compression, but relatively weak in tension. To compensate for this imbalance in concretes behavior, re-bar is cast into it to carry the tensile loads.

The manual bar bending process is difficult and consumes large amount of time. This process causes tiredness and fatigue to the worker in order to do the same work repeatedly. This process involves 2-3 workers for a single operation. And it is difficult to achieve accurate bend angles manually.

Aim Of The ProjectTo design and fabricate the manual pumping of hydraulic fluid from the Hand pump.

To design and fabricate the cylinder with ram to actuate by the hydraulic fluid being pumped from the manual pump.

To design and fabricate the rack gear to be moved by the actuation of the cylinder.

To design and fabricate the pinion gear to rotate by the actuation of the cylinder ram and rack to effect the rolling of the pusher rod against the bar for bending to roll against the center pin of the gear.

To design and fabricate the holder plate and frame for the action of the pumping and the cylinder actuation and bending.

To keep pace with customer demands while phasing out old equipments, hydraulic machines are getting developed as the need is. Hydraulic machines allows for constant load control and makes load distribution compared to the response of a screw drive. A hydraulic machine also has greater flexibility for cyclic and vibrational impacts than does a screw-driven machine.Working PrincipleThe machine is comprising the hand pump held at the base, the lifting of the lever by the spring will suck the oil from the oil tank through a non return valve and the pressing of the hand will effect the oil sucked from the oil tank to the pump housing will be pushed out through one non return valve to the outlet port to the hose pipe which connects the cylinder for actuation. The oil filling is through the oil inlet port. When the handle by the lever is lifted up, the piston is moved up which is creating the vacuum in the chamber and at the downward stroke of the piston, the oil will not return to the oil container due to the non return valve ball blocking the port, and the inlet valve to the cylinder opens due to the compression pressure of the piston. The oil enters the cylinder to push the ram of the cylinder out through the spring tension. The spring is fixed within the ram which is bolted to the housing. The ram coming out is expanding the spring by pressure of the oil entering the cylinder chamber. Each stroke of the piston operated by the lever in the pump is making the ram to move the ram out of the cylinder. The ram on which the rack gear is fixed will move out of whose teeth are engaged with the spur gear (pinion) which is rotated by the actuation.The center pin of the spur gear will guide the bar to be bend and the offset pin or rod will roll around the center rod bending the bar against the center pin to get the right angle bend or any other angle as required.

General Arrangement

Hydraulic Hand Pump

Main Parts involved in the projectBending die

Bending arm

Hydraulic cylinder

Spur gear

Rack gear

Pumping section

AdvantagesThe bar bending is easily hand operated with hydraulic pump and ram.

This rebar bending machine can be used for the bar of any smaller diameter upto 10mm rod.

It is handy to be used on site and can be shifted to any construction place and used on site.

It can be set for any angle or radius of rotation by changing the position of supports

Precise hydraulic control allows fast, efficient and bar bending for required angle or radius.

Integrated assembly of pump, cylinder, rack gear and the spur pinion gear with pusher rod with safety release valve.

Compact designthe self contained hydraulic pump and cylinder, punch and flexibility saves space.

Very compact and helpful with low investment.

Uses manual input force through hand pump which is multiplied for the actuation.

THANK YOU