Working principle
The working principle of hydraulic tire core is to use a slope to provide radial direction force to a vertical plane.

During the pipe bending process, the hydraulic lengthways thrust from the hydraulic system is increased by the wedge mechanism enlargement and converted into the force supporting the inner wall of the pipe interface.

The wedge core has three high-strength steel plates in the center, which are fixed together, and all the wedges are mounted on these plates.

The wedge is made of hardened steel. A total of twelve wedges are symmetrically distributed in pairs on the three steel plates to ensure the integrity of the construction and the flexibility of operation.

A set of high-strength steel round bow pieces, fitted next to the wedge to provide the necessary radial profile. Cherry steel spring plates and some rubber blocks are bolted to the round bow parts. During bending, the rubber block forms a cylinder that fits inside the tube.

To prevent damage during bending, the top rubber block is covered with an elastic band that will not deform.

Inside the tube, a hydraulic cylinder provides power for the operation of the tire core.

The core retracts and is supported by four wheels. The two wheels at the rear are connected by a hinge to a hydraulic motor.

The core does not move relative to the main engine, but only expands and contracts inside the tube.

Two high-pressure hoses connected to the bender hydraulic system provide power to the hydraulic cylinder.

All control of the tire core is done at the operation table of the pipe bender.