What is the reason for the large displacement value of the hydraulic strength testing machine in the process of pulling the test rod?

The reasons for the large displacement value of the hydraulic strength testing machine in the process of pulling the test rod may be as follows: 1. There may be leakage in the hydraulic system of the testing machine or poor cylinder sealing performance, resulting in hydraulic oil leakage and insufficient pressure in the cylinder, resulting in a large error in the tensile force of the hydraulic strength testing machine, resulting in a large displacement value. 2. The failure or error of the test machine sensor or measurement system may lead to inaccurate measurement results, resulting in large errors, resulting in large displacement values.For example, the reduced sensitivity of the sensor, inaccurate accuracy, poor contact of the measurement line, etc. may cause distortion of the measurement results. 3. The characteristics of the test bar itself may also have an impact on the test results. For example, the uneven surface roughness, irregular shape, uneven material, etc. of the test rod may lead to large friction and elastic deformation under the action of tensile force, resulting in a large displacement value. 4. Improper operation during the test may also lead to large displacement values. For example, during the test, if the loading speed is too fast, the clamping of the test rod is not firm, the equipment is uneven, etc., it may cause the test rod to slide or vibrate under the action of tensile force, resulting in a large displacement value. In order to reduce the displacement value of the hydraulic strength testing machine in the process of pulling the test rod, the following measures can be taken: 1. Regularly check and maintain the hydraulic system to ensure that the cylinder sealing performance is good and prevent the leakage of hydraulic oil.2. Check the measurement system and sensors regularly to ensure their accuracy and sensitivity. 3. Check and treat the test rod before the test to ensure that its surface is flat, the shape is standardized, the material is uniform, etc. 4. During the test, control the loading speed, clamp the test rod firmly, adjust the installation level of the equipment, etc. to reduce the sliding or vibration of the test rod under the action of tensile force.