Bending and molding production line

A bending and molding production line, comprising:

• an unwinding mechanism,
• a feeding and straightening device,
• a cutting-off mechanism,
• a bending and molding device,
• a bending and molding mechanism, and
• a material loading mechanism for transferring a tubular product to the bending and molding device from the cutting-off mechanism,
• wherein the bending and molding device comprises a base, the base is provided with a transverse sliding rail, and two transverse sliding bases disposed on the transverse sliding rail in a sliding manner,
• the base is provided with a transverse driving device driving the transverse sliding bases, the base is provided with a central clamping device which can clamp the tubular product and can rotate around a central axis of the tubular product between the two transverse sliding bases, each of the transverse sliding bases are provided with a longitudinal sliding rail, each of the longitudinal sliding rails is provided with a longitudinal sliding base, of two longitudinal sliding bases, which include a longitudinal sliding base at a left side and a longitudinal sliding base at a right side, each of the transverse sliding bases are provided with a longitudinal sliding device driving the longitudinal sliding base to slide, the longitudinal sliding base is provided with the bending and molding device, one side, which faces to the central clamping device, of the transverse sliding base at the left side is provided with a left clamping device capable of movably extending to clamp the tubular product, one side, which faces to the central clamping device, of the transverse sliding base at the right side is provided with a right clamping device capable of movably extending to clamp the tubular product,
• the bending and molding mechanism comprises a hollow mounting base rotatably disposed on each longitudinal sliding base, a hollow shaft is rotatably disposed in the hollow mounting base in a penetrating manner, a mandrel is rotatably disposed in the hollow shaft in a penetrating manner, one end of the hollow shaft and one end of the mandrel extend out of each longitudinal sliding base, the hollow shaft is provided with a moving bending head at the end, an end part of the moving bending head is cylindrical and its periphery is provided with a circle of groove matched with the tubular product, the mandrel is detachably provided with a bending die at the end, the bending die is provided with four cylindrical fixed bending modules arranged in two rows, connecting lines between the fixed bending modules are in a rectangle, an interval between the two rows of fixed bending modules is matched with a diameter of the tubular product to be bent, another end opposite to the end of the mandrel is connected to a fixed die motor disposed on each longitudinal siding base, a driven synchronous belt wheel sleeves a periphery of the other end of the hollow shaft, each longitudinal siding base is provided with a moving die motor, an output shaft of the moving die motor is provided with a driving synchronous belt wheel matched with the driven synchronous belt wheel, and a synchronous belt sleeves the driven synchronous belt wheel and the driving synchronous belt wheel,
• wherein the central clamping device comprises a box body, a rotary gear disk rotatably disposed on the box body, a power device disposed on the box body, a transmission mechanism connected to the rotary gear disk and the power device, and a clamping mechanism disposed on the rotary gear disk for clamping the tubular product, wherein the rotary gear disk is provided with a containing notch penetrating through the center of the rotary gear disk;
• the clamping mechanism comprises a left clamping block and a right clamping block;
• the left clamping block and the right clamping block are symmetric and bottom ends are hinged to a disk surface of the rotary gear disk;
• upper parts at opposite sides of the left clamping block and the right clamping block are provided with a left chuck and a right chuck respectively;
• an axis of the tubular product clamped by the left chuck and the right chuck is coincided with a central axis of the rotary gear disk;
• a lower part of the left clamping block located on the left chuck is provided with a left pushing block, a lower part of the right clamping block located on the right chuck is provided with a right pushing block, the upper parts of one sides, back onto each other, of the left clamping block and the right clamping block are connected to the rotary gear disk by a left tension spring and a right tension spring respectively, and a pull force of the left tension spring and the right tension spring drives the left chuck and the right chuck to abut against each other;
• a lower part of the disk surface of the rotary gear disk located on the left pushing block and the right pushing block is provided with a reset pushing rod, the box body is provided with a reset oil cylinder driving the reset pushing rod to move, the reset pushing rod pushes the left pushier block and the right pushing block when pushed upward, such that the left clamping block and the right clamping block rotate to separate the left chuck from the right chuck;
• the transmission mechanism comprises a left transition gear and a right transition gear disposed on two sides of the reset oil cylinder in the box body respectively and meshed with the rotary gear disk, a left transmission gear meshed with the left transition gear is disposed in the box body and a right transmission gear meshed with the right transition gear is disposed in the box body, a left synchronous belt coaxial with the left transmission gear and capable of synchronous rotating with the left transmission gear and a right synchronous belt coaxial with the right transmission gear and capable of synchronous rotating with the right transmission gear are further disposed in the box body, an output shaft of the power device is fixedly connected to a main synchronous belt wheel, and a main synchronous belt sleeves the main synchronous belt wheel, the left synchronous belt wheel and the right synchronous belt wheel.