System framework selection. According to the hardware conditions of the on-site computer, and according to the requirements of other hardware, this system uses Windows 98 as the operating system. (3) Selection and design of system instrument modules. First analyze the system requirements: the physical quantity to be detected by the system includes: multiple analog signals collected by multiple channels; multi-channel A/D conversion, multiple data processing, multiple clock counters, etc.; Multiple digital and analog control of hydraulic pumps, motors, servo controllers, and alarms.
In accordance with the above requirements and in combination with other conditions, this system uses AD's PCL-818L data acquisition card and PCL-836 multi-function card. (4) Selection of system development platform: Taking into account the visual programming, component reusability, integrated development environment and the need for powerful auxiliary tools, this system uses Delphi as a development platform. (5) Development of system software: The system software should provide a good test platform for auto parts test system, so that the operator can easily realize the real-time testing process of all parts under a good user interface; the test system can be implemented by software. Automatic control, and real-time acquisition, analysis, display, and result storage of test parameters and query and printing.
System hardware structure According to the system requirements, the signal of the system comes from different types of sensors, including the pressure-variable resistance sensor, displacement sensor, torque measuring device, pressure sensor and photoelectricity rotation sensor installed on the test bench, and needs to work on the table. The frame of the motor and hydraulic machine to achieve program control. Therefore, the system uses a virtual instrument module based on the computer bus as the main data acquisition and control device to achieve system functions.
In order to achieve synchronous real-time acquisition and control of multiple channels of data, the system uses a multi-functional data acquisition card PCL-818L and multi-function digital input/output module PCL-836. Multi-channel A/D acquisition function using PCL-818 To obtain radial input, radial displacement, gap pull pressure, clearance position, swing torque, rotational torque and other analog input; use 16-bit digital input/output channel output stepper motor controller digital signal to control stepper motor The operation; In addition, the use of D / A channel output analog command signal (sine wave) to control the displacement and load server work.
The main functions of the PCL-836 are clock counting and 16-byte TTL digital input/output. The system uses the digital input channels of the PCL-836 to obtain the rotational frequency and the wobble frequency from the photoelectric sensor, and uses a digital output channel to control the relay that connects the hydraulic pump. The overall hardware structure box,
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