Based on Siemens S7 - 300 PLC stirrup production equipment

Construction is one of the infrastructure and basic conditions of human life, with the improvement of living standards and the development of human society, people become more and more urgent demand for construction, the scale of construction projects and the number is growing. In the construction industry in our country, the structure of reinforced concrete structures also occupies a considerable proportion. In reinforced concrete structure, steel bar is the skeleton of the building, it consists of main steel bar and stirrup. The shape and size of the stirrup has something to do with the design of the main steel bar, and the dosage of it many times more than the amount of stirrup Lord. But in the real production, stirrup stirrup production has two parts: one is straightening device, the other is a hoop bending forming device. The current simple bending hoop equipment far cannot satisfy large quantities, many varieties of processing mode, the worker's labor intensity, low production efficiency, high labor costs. Two S7 - Profile, and the hardware/network configuration SIMATIC S7 300 - 300 is Germany's Siemens ( Siemens) Company production of modularization, small and medium-sized PLC system can satisfy the middling performance requirements. S7- 300 system through the combination between various individual module can constitute the different requirements of the system; S7- Instruction system has high speed (300 0. 6 ~ 0. 1μs） The speed of; S7- 300 support with floating point number and inverse trigonometric function calculations, more complex arithmetic can effectively; S7- 300 by uniform Step 7 software is convenient and simple for all module configuration and parameters of the assignment; S7- 300 with multi-level password protection enables users to height, effectively protect the technical secrets, prevent unauthorized copy and modify; S7- 300 have powerful communication function, which different types of communication interface, and through a variety of communication processor to connect the AS - I bus interface and industrial Ethernet bus system, more interface ( MPI） Integrated in the CPU, is used for connection of programming at the same time, the PC machine, man-machine interface system and other SIMATIC S7 / M7 / C7 automation control system, etc. Hoop bending process involves a large number of calculations, we need a can support the powerful operation function of PLC controller, Siemens S7 - 300 just meets our requirements. Step 7 ProfessionalV5 of Siemens. 4 SP3 programming software support LAD, STL and FBD three kinds of programming languages, and support the three kinds of programming languages, mixed greatly improve the efficiency of programming. So in view of the stirrup production reality, considering the use environment for high dust, high electromagnetic interference, had exceeded industrial PC, we chose a S7 - the use of advanced, mature 300 main core PLC, touch screen as the man-machine interface ( HMI） , yaskawa ac servo drive system scheme of the actuator for the design of automatic stirrup production equipment. S7 - Contains CPU314C - 300 as the core of control system 2 dp ( CPU) FM354 ( Drive traction part of the controller) FM353 ( Bending part of the controller) SM321 ( Input module, feedback all kinds of action of the actuator position is correct and the control signal) 、SM322（ Output module, control the action of all kinds of electromagnetic valve) Form, as shown in the figure below: S7 - 300 with a touch screen to connect to the Internet we choose the MPI, CPU314C - 2 dp MPI address set to 2, a SM354 MPI address, 3 SM353 MPI address is set to 4, HMI address set to 1, the network configuration as shown in the figure below: three principle according to the actual situation of production, stirrup we adopt distribution device and hoop bending forming device placed together. Straightening part mainly consists of two rows of straightening roller, horizontal, vertical, and through the roll extrusion to remove the steel bar bending stress, as shown in the figure below. In order to facilitate the adjustment of the user, the upper part of the location of the straightening roller can be adjusted, so as to adapt to different diameter of reinforcing steel bar. Straightening device by a 11 kw ac servo motor traction, traction of complete feed at the same time. Bending part with the method of roundabout, centered on a shaft, another shaft arm revolve around the axis, as shown in the figure below. The bending part to bend a steel bar as the center/return, also can undertake clockwise/counterclockwise rotation. Curved FM353 positioning module to control the speed and Angle of, realized the high speed, precise positioning of rotating parts from to a 7. 5 kw ac servo motor for traction. When processing is complete, stirrup by ordinary three-phase asynchronous motor by connecting rod drives the scissors to snip the reinforcing steel bar, and then go to the next cycle. The realization of the four software S7 - 300 PLC controller system programming software use STEP 7 Professional V5. 4 SP4 programming software packages ( To FM354, FM353 to set, we want to install four doors provide Simatic S7 FM353 / FM354 Parameterization Version 4. 03. 04) , adopting modular object-oriented programming ideas, complete the hardware configuration, parameter Settings, PLC controller programming, testing, debugging, and document processing. Due to the STEP 7 Professional V5. 4 SP4 support within the same block at the same time using LAD, STL and FBD three kinds of programming languages.
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