The ">steel bar bending and coiling machine is specialized equipment that integrates straightening, fixed-length cutting, bending, and shearing of steel bars through a numerical control system or mechanical transmission control. It is mainly used to produce stirrup components that fix the position of main reinforcement bars in building structures, and it can process steel bars into various shapes such as right angles, hooks, and arcs.
As a core type of steel bar processing machinery, it has completely transformed the traditional segmented manual operation mode and has become key equipment for achieving standardized stirrup production in modern construction and infrastructure projects.
Working Principle and Core Structure
Core Working Logic
The fully automatic CNC steel bar bending and coiling machine adopts an integrated process of "continuous feeding + precise bending." The specific process can be divided into five steps:
Raw material feeding: The coiled steel bars are placed on the wire feeding rack equipped with a braking system (to prevent loosening in case of power failure) and are fed into the main machine through the traction mechanism.
Steel bar straightening: Two sets of adjustable straightening wheels (horizontal and vertical) work together with four sets of traction wheels driven by imported servo motors, controlling the straightening accuracy of steel bars within ±1 mm.
Quantitative feeding: According to preset dimensions, the feed motor drives the traction wheels to deliver the steel bars to the designated position, with a feeding speed of up to 90–110 m/min.
Precise bending: The bending arm, driven by a servo motor, rotates at a speed of 1100°/s and applies force to the steel bar through a stop column to achieve bending at any angle between 0° and 180°, with an angle accuracy of ±1°.
Cutting and forming: After bending is completed, the shearing mechanism operates at high speed to cut the steel bars, and the finished products are discharged directly. The entire process does not require stopping the machine for adjustments.
During this process, the PLC control system receives sensor signals in real time, precisely coordinates the movement of each mechanism, and can continuously process complex stirrup shapes with up to 60 bends.
Key Component Systems
- Mechanical actuator system
Feeding mechanism: Consists of upper and lower traction wheel sets that press the steel bars through spring pressure to ensure stable conveying.
Bending mechanism: Composed of a telescopic bending arm, turntable, and multiple sets of stop columns, enabling multi-directional bending.
Shearing mechanism: Uses an electric cutter combined with positioning baffles to achieve precise cutting.
Straightening mechanism: Dual adjustable straightening wheels meet the straightening requirements for steel bars of various diameters.
- Electronic control system
Mainstream models are controlled by PLCs paired with industrial computers and touch screens. They can store tens of thousands of product parameters and feature fault detection and alarm functions. Imported servo motors drive each actuator to ensure quick and accurate response.
- Auxiliary system
Includes two standard braking wire feeding racks, stainless steel operation panels (anti-corrosion and rust-resistant), and auxiliary equipment such as air compressors. Some models are equipped with finished product collection racks.
Industry Application Scenarios and Core Values
The equipment is widely used in various engineering applications centered on stirrup processing:
Construction engineering: Production of stirrups for beams, columns, and shear walls of high-rise buildings, commercial housing, and affordable housing - such as standardized stirrup processing in prefabricated component factories for prefabricated buildings.
Bridge engineering: Fabrication of stirrups for the steel reinforcement of bridge piers and cap beams, meeting structural requirements for different cross-sectional dimensions.
Municipal engineering: Processing of support stirrups for road guardrails and underground utility tunnels, satisfying diverse specification requirements for outdoor construction.
Rail transit engineering: Production of stirrups for the lining of metro stations and tunnel sections, ensuring the seismic performance of the structure.