Roundness tester is a length measuring tool for measuring roundness using the rotary axis method. The roundness meter is a measuring tool for measuring the roundness error of the workpiece using the rotary axis method. Roundness tester is divided into two types: sensor rotary type and workbench rotary type. During measurement, the measured part is installed concentrically with the precision shaft system, and the precision shaft is attached with an inductive length sensor or a workbench for precise circular motion. It is composed of sensor, amplifier, filter and output device of the instrument. If the instrument is equipped with a computer, the computer is also included in the system.Roundness Tester The principle of the roundness meter is the same as that of the coordinate measuring machine. In fact, its working principle is very simple. The coordinate measuring machine is a point acquisition tool. Its principle is to collect points first, and then form a line from points, and then form a three-dimensional model from lines. CMM is a kind of measuring equipment that has a guiding mechanism, a length measuring element, a digital display device in three mutually perpendicular directions, and a worktable that can place the workpiece (not necessarily large or huge). The measuring head can be moved to the measured point easily by manual or motorized means, and the coordinate value of the measured point is displayed by the reading device and the digital display device. Obviously, this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate value of any point in the measured volume can be displayed through the reading device and digital display device. Roundness Measuring Instruments ,Roundness Measuring Machine,Instrument Used To Measure Roundness,Roundness Tester,Gear profile measuring instrument Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com
Ducklings Identification Technique
The male-male differential technology of ducklings is an important and practical technology. Through this technology, the male chicks can be sorted out for fattening when they are born, saving the bred houses, feeds and equipment; Can be implemented to separate male and female breeding, can promote the rapid fattening ducks, shorten the feeding cycle; ducks can be provided in accordance with the proportion of sex, in short, male and female identification technology can play a role in increasing income and saving in the duck industry. Here are some ways to identify ducklings. 1. Anal discriminating method Anal discriminating method is most commonly used in several methods, and the accuracy is also high. According to different operating methods, it can be divided into the following three methods. 1.1 The method of differential analysis of overturned anal canal is the most commonly used method of identification. During operation, the middle finger and ring finger of the left hand grip the neck and make the abdomen upward. The thumb and forefinger of the right hand are placed on both sides of the cloaca and gently opened. Cloaclavus, if seen in the cloacal cavity about 0.2-0.4mm small projections for the male chicks, such as the figure was eight-shaped fold, the mother ducklings. 1.2 The method of pinching the anal verge is also a frequently used method. During operation, the left hand grasps the ducklings, the left thumb is close to the back of the ducklings, and the other four fingers drag the abdomen back to the abdomen, and the anus faces the discriminator. Then the thumb and index finger of the right hand are gently pinched on both sides of the outside of the cloaca. If the finger feels a small protrusion, it is a male duckling. If it is not, it is a mother chick. The pinching anal method is faster than the anal method and requires the operator's finger to have a higher sensitivity. 1.3 compared with the first two anal vertigmata method, this method is the most difficult to grasp, but the fastest speed after mastery, grasping the gripping method is similar to pinching the anal, left hand grasping the ducklings, the right middle finger gently lifts the cloacal outside a top . Feeling that there are small protrusions are ducklings, and vice versa. 1.4 Shape Identification Method This method requires extensive practical experience, and there are also certain differences among varieties. Generally speaking, the accuracy rate is not very high. Therefore, the shape identification method is mostly used to roughly estimate the sex ratio of male and female in the group. The male duck has a large head, long jaw length, long neck length, high foot length, long tail tip, and a long body shape. The burrs around the jaw are angular; the female duckling has a small head, short jaw, short neck, short legs, and tail feathers. Open, short round shape, the edges around the crotch arc. The youngster has a narrow nose, a linear shape, and a rough, nostril edge; the mother's nostril is wide, round, soft and not undulating, the mandibular burrs are distinctly solid, triangular and untidy, and the male lower jaw Curved and neat edges are mothers and youngsters. 3 The method of identifying the sounding tube is also known as the lower throat. At the top of the trachea bifurcation, it is the vocal organ of ducks, and the morphological structure of the ducks of male and female ducklings is quite different. The ducklings of the male ducks bulge in a spherical shape with a diameter of about 3-4 mm. They can be found on the chest, while the ducklings are only slightly larger at the intersection of the trachea. (Heilongjiang Institute of Animal Husbandry, Zhou Jingming)