The steel bar bending and coiling machine is an automated processing device specially designed for bending and shaping steel bars. It can bend straight steel bars into various shapes such as stirrups and hooks according to architectural design requirements. It is widely used in steel bar processing for construction, bridges, water conservancy, and other projects, and is one of the core pieces of equipment in modern steel bar processing plants. Its core structure consists of two major systems: the mechanical system and the control system.
-
Mechanical Actuator System
Feeding and straightening mechanism:
It consists of two sets of adjustable straightening wheels in horizontal and vertical directions, along with four traction wheels. The lower row of guide wheels is positioned by a lead screw–nut mechanism, and the steel bars are pressed tightly by spring pressure. Combined with an imported servo motor drive, it achieves precise feeding, with straightening accuracy reaching ±0.5 mm.
Bending forming mechanism:
Centered around a motor-driven rotating turntable, the edge of the turntable is equipped with adjustable stop columns. Through fixed-angle rotation of the turntable, the stop columns push the steel bars to achieve bending. Mainstream equipment can achieve bending at any angle from 0° to 180°, with an angle error controlled within ±1°.
Cutting mechanism:
An integrated electric steel bar cutter, which adopts hydraulic drive or mechanical shearing, can quickly cut steel bars after the bending process is completed. The cutting speed can be precisely synchronized with the bending rhythm, and the cutting time for a single bar is ≤0.8 seconds.
-
Intelligent Control System
Mainstream equipment adopts PLC or CNC numerical control systems equipped with human-machine interaction interfaces and has three core functions:
Parameter setting and memory: Capable of storing processing parameters for over 50 sets of different stirrup specifications.
Action logic control: Precisely regulates the timing of feeding, bending, and cutting through sensor feedback signals.
Fault diagnosis: Monitors abnormalities such as motor overload and steel bar jamming in real time and provides alarm prompts.
Core Workflow
Initialization preparation:
Through the control system, parameters such as reinforcing bar specifications, bending angles, and stirrup sizes are set. The straightening wheels and stop columns automatically adjust to the correct positions.
Feeding and straightening:
After the steel bars are fed in, the traction wheels drive them forward, while the straightening wheel set eliminates the original bending stress of the bars to ensure feeding accuracy.
Bending forming:
Once the reinforcing bars reach the designated position, the bending motor drives the turntable to rotate, and the stop column pushes the bars to complete the bending at the preset angle. The machine can continuously achieve multi-segment bending at different angles.
Cutting and finishing:
After forming, the cutting mechanism quickly cuts the steel bars, and the equipment resets to begin the next processing cycle. The processing cycle for a single stirrup can be shortened to 3–5 seconds.
Core Application Fields
Residential buildings:
This is the largest application scenario, mainly used for processing stirrups in components such as shear walls, beams, and columns. It is compatible with Φ6–12 mm threaded steel and plain round steel bars.
Commercial buildings:
Covers large-scale structures such as office buildings and shopping malls, which have higher requirements for the precision of steel bar forming. The proportion of intelligent equipment used exceeds 70%.
Transportation infrastructure:
The load-bearing structures of bridges and tunnels require high-strength stirrups, and the equipment is mostly adapted to thick steel bars with diameters ranging from Φ16 to 32 mm.
Water conservancy projects:
Used for processing steel bars in anti-seepage structures such as dams and culverts, which have high requirements for equipment corrosion resistance. Special models adopt stainless steel straightening wheels.