Abstract: This paper proposes a new synchronous test method for long-stroke multi-cylinders, which replaces the traditional large-range sensor absolute displacement measurement method and realizes real-time detection. The practice shows that the method is direct and reliable, with significant technical and economic value and wide application prospects.
1 Introduction
The test work of hydraulic synchronous operation is very important, because it is a scientific evaluation method for system performance, and it is also an effective and effective means for early exposure of defects, timely treatment or improvement, quality improvement and reliability. Since the test work is carried out under simulated actual conditions, the factors that cannot be considered in the design can be “added†to the test to the maximum extent, and the technical and economic value cannot be ignored.
The long stroke cylinder system is widely used, especially in large and heavy equipment (such as large sluice lifting equipment, offshore engineering, engineering machinery, etc.). During the operation of the equipment, the load is always in an unbalanced and random change state, so the synchronization requirement for the long stroke cylinder is high, otherwise the equipment performance is inferior, and even the damage is severe and the crash is invalid. For long-stroke multi-cylinders, if the absolute displacement detection is carried out by the traditional method, a large-range displacement sensor must be used, which is obviously uneconomical and difficult to install, and is not suitable for the needs of simulation test and on-site inspection. After years of research and practice, this paper proposes to use the relative method to carry out on-line detection of the synchronous operation state of long-stroke multi-cylinders. At present, good results have been achieved in scientific research and production practice.
2 Test working principle
The working principle of the synchronous test system sensor and the synchronous cylinder connection arrangement is shown in Fig. 1. The relative displacement test of this system uses a short-stroke grating sensor as the detection element. The grating displacement sensor consists of a fixed length 7 and a slider 8 (reading head). The fixed length and the sliding ruler are respectively mounted on the piston rods of different cylinders. When the system is working, the fixed length and the sliding ruler move together with the piston rod. When the two cylinder rods move synchronously, there is no relative movement between the fixed length and the slider, and there is no signal output from the reading head. When the two cylinder rods are not synchronized, there is relative movement between the fixed length and the slider. The head has a displacement error signal output.
figure 1
During the operation, in order to protect the grating pair from damage due to accidental reasons, a safety protection structure of the grating is designed. In Fig. 1, 1 is a cylinder, the magnet 4, the connecting plate 3 and the piston rod 2 are fixedly coupled, and the fixed length 7 is fixedly connected with the piston rod 9. Due to the magnetic attraction generated by the magnet 4 and the magnetic conductive plate 5, the sliding ruler 8 will Move with the piston rod 2. When the cause of the accident causes the relative displacement of the piston rods of the two cylinders to be relatively large, the magnetic conductive plate 5 (sliding ruler) hits the retaining iron 6 and cannot continue to move, and the magnet 4, the connecting plate 3, and the piston rod 2 continue to move due to the fixed coupling. The magnet 4 is brought into contact with the magnetic conductive plate 5 to protect the safety of the grating pair.
In the test, the consistency of the operating state of the two cylinder piston rods is the most interesting and the most essential problem. The above method can improve the test requirements of the synchronous test system of the long stroke multi-cylinder.
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