Metal hose bending and twisting test bench test method

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Metal hose bending and twisting test bench test method

1) 90° bending and twisting test

Take the 1000mm sample hose as shown in the figure. When the air pressure is 20Kpa, one end is fixed on the test bench, bent at 90° at 500mm, and the other end is connected with the fixed handle and sealed. The tube rotates around the axis, ABA, ACA is a period of two times, the torsional motion period is 30 cycles/min, and the torsion period is 5000 cycles. Observe the bellows for cracks and air leaks, and whether the protective sleeve has cracks.

1) 30° swing bending test

Install a 1000 mm long sample hose as shown below. The hose and the weight joint are free to move in the vertical direction, and the clamp 4 allows a slight reciprocating movement in the vertical direction. Weight weight = hose weight + clamp weight + arm weight. The arm is alternately oscillated 30° to the left and right, AA is a cycle, the oscillation period is 30 cycles/min, and the torsion cycle is 10000 cycles (the number of times can be set, and the number of arrivals is automatically stopped), and the air pressure unmanned bellows of 20 kPa is introduced. No cracks, no leakage, no cracks in the protective sleeve

1) 180° bending test

Inject the covered tube into the air pressure state, fix one end of the tube, and use a cylinder (diameter φ40 φ45 φ50 φ60) and bend it by 180°. According to the ABA direction shown in the figure, the ACA direction is 1 time, the 2nd bending is regarded as one cycle, the bending rate is controlled at 5 cycles/min, and the alternating cycle is 6 cycles or 8 times (the number of times can be set, and the number of arrivals is automatically After stopping the cycle, confirm that the original pipe has no cracks, no leakage, and there is no crack in the coating.

1) 90° twist test

As shown in the figure below, in the air state with a pressure of 20Kpa in the specified length of the hose sample, one section is fixed to the upper end of the test bench to pass air, the other end is connected to the handle and sealed, and the handle is used to make the covered pipe around the axis ABA and ACA are twice 90° twisted, the torsional movement speed is 5 times/min, the twist is 10 times (the number of times can be set, and the number of arrivals is automatically stopped), and then the bellows is observed for cracks and air leakage, and the coating layer has cracks. .
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