(1) Display synchronous operation data in real time on the display screen;
(2) Synchronous operation data for full stroke or preset stroke detection;
(3) Find the average error and the range of error variation;
(4) Record the synchronous running curve and generate the data file.
This program is written in VB5.0 language. It uses the dedicated Mscomm control to realize serial data communication between the instrument and the computer, and uses function procedures and subroutines to realize the call of data acquisition, synchronous running curve drawing and data processing. Figure 3 is a block diagram of the program flow.
image 3
5 Simulation test of synchronous operation
The relative displacement of the piston rods of the two cylinders reflects the performance of the synchronous system. The fixed length and the slide rule respectively mounted on the piston rods of the two cylinders are used as the detecting elements. The real-time display data through the above detection system directly reflects the two piston rods in real time. The relative displacement between them, that is, the synchronous operation. Therefore, the relative method is used to detect the displacement between the two piston rods in full compliance with the actual working conditions. The working principle of the synchronous test is shown in Figure 4. The two long stroke test cylinders are placed on the simulation test bench. The simulated working condition loading cylinder piston rod and the test long stroke cylinder piston rod are connected to the trolley structure to form a "top cylinder", and the connecting trolley is equipped with a roller with a bearing. Rolling on the guide rails ensures that the loading cylinder piston rod and the test long stroke cylinder piston rod move in a straight line with little friction. The external load of the test long stroke cylinder is to adjust the opening degree of the throttle valve separately, and form a certain back pressure to generate different external loads, resulting in a certain load difference to simulate the actual working state of the long stroke cylinder. When the long stroke cylinder is out of sync due to load difference or other factors, the grating displacement sensor mounted on the two long stroke cylinder plugs has a signal output. The signal is collected, displayed, processed, and printed by the conversion circuit, counting, computer system, the running curve is drawn, the data file is generated and stored, and the post-analysis processing is performed. The asynchronous data acquisition and processing of the entire simulation working process is performed under the control of the computer program, and the online detection of the running state is automatically completed.
Figure 4
Using the above simulation test system, the synchronous system is simulated under different loads. Figure 5 is the synchronous error curve with real-time detection of 15MPa. The maximum synchronization error is 0.18mm, which meets the design requirements, indicating that the synchronous system has better synchronization performance. .
In the above simulation test system, the opening degree of the valve forming the back pressure is changed by an electric control method according to a certain law or randomly changed to generate a varying external load, that is, a synchronous test of the dynamic load can be performed to study the dynamic performance of the synchronous system.
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