â–¡ Li Jingzhen, the measurement institute of the Horqin District, Tongliao City, Inner Mongolia, refers to the movement of the pointer caused by tapping the case at the same verification point. The absolute value of the difference between the two indications before and after tapping the case is the tapping variation, which should not exceed one-half of the absolute value of the maximum allowable basic error of the inspected table. The purpose of checking the amount of tapping is to observe whether the pointer is beating or displaced, and to understand whether the components are assembled well. Therefore, tapping the amount of variation during the pressure gauge verification process is an important indicator in the indication verification. When the pressure gauge is in the working position and pressurizes to a certain value, after tapping the case, the pointer should first swing counterclockwise and then return to the original position. Otherwise, there must be a tapping variation. The reason for this is as follows. Species: 1. The pointer is not tightened or the pointer sleeve and the pointer piece are loose. The pointer can be nailed or replaced. 2 The pointer is too close to the dial or the watch glass, and the disk is scraped or scraped during the movement to cause a beating. The distance between the pointer and the dial and the watch glass can be adjusted to make the pointer move smoothly over the full range without scraping the dial or scraping the watch glass. 3. The movement installation position is not correct. During the movement of the pointer, the pointer sleeve rubs against the center hole of the dial, and the movement fixing screw can be loosened to adjust the position of the movement so that the center gear shaft is at the center of the center hole of the dial. If the indication is accurate, it can also be solved by expanding the center hole of the dial. 4 The dial is not fixed, and the dial is misplaced when the case is tapped. The dial can be realigned and fixed. 5 The balance of the hairspring is not enough to produce enough counter-torque. The pressure can be reduced to zero, the fan teeth are removed, and the balance spring is tightened or enlarged to produce sufficient counter torque. The hairspring is too long, the stiffness is not enough, and the elasticity is poor. There is not enough counter torque in the tightened or expanded state. The pressure can be reduced to zero, the hairspring fixing pin can be unplugged, and the outer circumference of the hairspring wire can be appropriately shortened and re-installed and fixed. The hairspring is then moderately tightened or enlarged to allow it to generate sufficient counter torque. Poor screw fastening. Among them, the screws of the fixed movement and the indication adjustment screws have the greatest influence. If this happens, look carefully and tighten the loose screws. 8 tooth and center tooth engagement parts adhere to dirt or meshing teeth have wear affecting the inter-tooth transmission. If the engaging parts adhere to dirt and affect the inter-tooth transmission, it is possible to remove the dirt. If the meshing teeth are worn, the pressure can be reduced to zero. Loosen the movement fixing screws, change the meshing part of the center tooth and the fan teeth, avoid the wear teeth or replace the new fan teeth or center teeth. The sector gear shaft or sun gear shaft is flattened and new fan teeth or center teeth can be replaced. There is wear at the joint between the connecting rod and the free end or the fan tooth. The new link should be replaced. The connection between the transmission parts is not flexible or stuck. There are roughly the following situations: the connecting rod and the free end connecting groove are rubbed against each other, and can be corrected by the shaking of the connecting rod wrench. The pin on the free end connection groove is grooved and the new pin should be replaced. The gap in the free end connection groove is too small, you can use a suitable tool to pry it apart, or use a file to enlarge the gap. The indication adjustment screw is too tight and should be loosened properly. In actual work, it can be analyzed according to the specific situation, and then take corresponding measures to limit the amount of tapping variation within the allowable range. The adjustment of the balance of the (B) balance is not equal to the adjustment of the arm error. In the Zhou Xianqi, the calculation and control center of PetroChina Jilin Petrochemical Company, due to the influence of environmental conditions, the balance of the balance is often caused. When using direct measurement, the unequal arm error will be taken to the measurement of the 34 China Measurement 20022 technical article, which will distort the measurement results. The effects of the unequal arm error can be accurately and quickly eliminated as described below. First, check the size of the unequal arm error. 1. Select the two equivalent weights of the maximum load of the balance and use the exchange average method to determine the error. Single-Column Universal Tensile Testing Machine The machine applies tension, compression, bending, and shear forces to test the strength, elasticity, and durability of various materials such as metals, plastics, textiles, rubber, ceramics, and composites. It can measure parameters such as tensile strength, yield strength, elongation, modulus of elasticity, and fracture toughness.
A typical UTM consists of a load frame, grips or fixtures to hold the specimen, a load cell or force transducer to measure the applied force, and a displacement transducer to measure the deformation or displacement of the specimen. The machine is controlled by a computer or a control unit that allows the user to set the testing parameters and record the test data.
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