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Figure 25: 2D drawing of the machine
Figure 26 3D view of the machine
2) Overview of the machine
Working principle: The gas-liquid joint-controlled pipeline anti-smashing restraint test rig can almost completely simulate the impact state of the anti-smashing restraint when the pipeline is slammed. Its working principle is to use the characteristics of air compressibility and expansion speed in the capsule energy storage device to simulate the impact and continuous loading of the pipeline slamming action against the tamping constraint when the pipeline is broken, and the hydraulic medium and the hydraulic valve group are well controllable. Performance controls the speed at which the hammer strikes, thereby effectively controlling the impact energy.
Due to the use of compressed air in the capsule energy storage device to instantaneously release energy to form the impact principle, combined with the hydraulic release control device, the output energy of the test equipment can be controlled. The device is small in size and low in height and can be installed indoors. Pneumatic and hydraulic technology is a very mature technology, which is conducive to smooth, safe and reliable operation during impact test. It is also beneficial for installation of sensors such as force, strain and displacement. This allows various data to be accurately measured during the impact test of the tamper-resistant restraint.
3) Technical parameters
l The pipeline anti-smashing restraint test rig should be able to meet the requirements of installing DN150 and below pipeline anti-smashing restraint (U-bar, flattened type, door type frame, etc.) in the space and connection mode, and can be in the pipeline When the flood control constraint is impacted, record the following data:
a) record the mass of the weight before the impact test, the impact height and the installation position of the end of the tamper-resistant restraint;
b) recording the speed, energy and momentum of the moment when the hammer head is in contact with the tamper-proof restraint;
c) Record the deformation size of the anti-smashing constraint (Ubar's arc top displacement curve, the impact point deformation curve of the flattened tube, the door frame impact point deformation curve, etc.)
d) recording the reaction force-time curve at the base of the tamper-resistant restraint during the entire impact process;
e) High-speed photography of the entire process of impact protection.
l The maximum impact speed of the hammer head of the pipeline anti-smashing restraint test bench should be no less than 4m/s, which should meet the requirements of the DN150 pipe diameter anti-smashing test.
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