A roundness tester is a measuring tool that uses the rotation axis method to measure the roundness error of a workpiece. The roundness tester is divided into sensor rotary and workbench rotary. During measurement, the measured part is installed concentric with the precision shaft system, and the precision shaft is equipped with an inductive length sensor or workbench for precise circular motion. The roundness meter consists of an instrument's sensor, amplifier, filter, and output device. If the instrument is equipped with a computer, the computer is also included in this system. A roundness tester is a precision instrument used to measure the out-of-roundness of a rotating surface (shaft, hole, or spherical surface) of a component. There are usually two types: small desktop, where the workpiece is mounted on a rotating workbench and the measuring head is mounted on a fixed column; and Large floor mounted, with the workpiece installed on a fixed workbench and the measuring head installed on the rotating spindle. During measurement, the measuring head contacts the workpiece's surface, and the instrument's rotating part (workbench or spindle) rotates for one cycle. Due to the extremely high accuracy of the supporting bearings in the rotating part, the measuring head will generate a high-precision circular trajectory on the measured surface during rotation. The out-of-roundness of the measured surface causes the measuring head to shift and transform into an electrical (or pneumatic) signal. After amplification, it can be automatically recorded on a circular recording paper, and the out-of-roundness of each part can be directly read out for accuracy evaluation and process analysis and widely used in precision bearings, machine tools, and instrument manufacturing industries.
The Roundness Testeradopts a radius measurement method and operates in a rotating manner. The rotation axis system of the roundness meter adopts a high-precision air floating spindle as the measurement reference; The electrical part of the roundness tester is composed of advanced computers, precision circular grating sensors, and precision inductance displacement sensors. The circular grating sensors and precision inductance displacement sensors measure angle and radial displacement, ensuring the accuracy of measuring the angular displacement and radial value of the workpiece; The roundness meter measurement software adopts a roundness measurement software based on the Chinese version of WinXP operating system platform, completing data collection, processing, and measurement data management. China Roundness Measuring Instrument,Roundness Tester Machine,Mitutoyo Roundness Tester Manufacturer Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com
Pigtails increase the speed of growth
The growth rate of piglets after castration is significantly faster, about 10% higher than that of regular pigs, and they are slaughtered 10 to 15 days earlier. The procedure involves the following steps:
Before the operation, a high-temperature disinfected scalpel, single-edged blades, alcohol, cotton balls, and gentian violet should be prepared. The surgery should be carried out within 1 to 2 days after birth. Two people are needed during the process. One person holds the piglet’s hind legs and lifts them at an angle of about 60 degrees, with the tail facing up. The other person holds the tail in one hand and the scalpel in the other. The tail is cut 1.5 cm from the base, and the movement should be quick. After cutting, the wound is immediately treated with a purple antiseptic solution to stop the bleeding. Before performing the surgery on the next pig, the scalpel must be disinfected again. The wounds typically heal within 3 days. After the operation, it's important to keep the wound clean and ensure the piglet stays warm. This helps prevent the sow from accidentally pressing the piglet when turning around. Once fully recovered, the piglet can be raised like a normal one.
Research on piglet nutrition in Hunan Province is leading globally. On January 16, reporters Hu Yufen and Guo Yinghong reported that due to the successful development of highly nutritious, antibiotic-free, and hormone-free feed, the long-standing issue of "piglet disease" may soon become a thing of the past. The research team led by Yin Yulong at the Institute of Subtropical Agriculture, Chinese Academy of Sciences, has spent four years working on this challenge. They have improved the nutritional physiology of weaned piglets from the organism level to the molecular level, transitioning from qualitative to quantitative improvements. Their piglet compound feed has been widely applied in many farms across the province and beyond. Not only does it help piglets survive the weaning stress, but it also reduces feeding costs and significantly lowers the use of clinical antibiotics. At today’s results appraisal meeting in Changsha, academicians such as Liu Yan praised the achievement as being internationally advanced, with some parts reaching international standards.
Pork is the main meat product for Chinese consumers, and pigs are the most challenging to raise in the industry. Weaned piglets often experience various stress reactions. According to surveys, the diarrhea rate among weaned piglets in China ranges from 50% to 60%, with a mortality rate between 15% and 20%. This seriously hinders the healthy development of the pig industry. Additionally, antibiotics are commonly added to feed to prevent diarrhea, which over time leads to reduced immunity in animals and food safety issues, posing a serious threat to human health.
Supported by the Ministry of Science and Technology, the Chinese Academy of Sciences, and the Provincial Department of Science and Technology, the Institute of Subtropical Agriculture, Hunan Zhenghong Science and Technology Development Co., Ltd., and Nanchang University have collaborated on the research and development of “functional amino acids and plant extracts for piglets.†Through in-depth studies on the physiological functions of nutrition and their applications, the project team has made significant progress. At the molecular level, they have revealed how functional amino acids promote piglet growth and identified protein turnover patterns in piglets fed low-protein diets supplemented with amino acids. They also discovered breakthroughs in glycyrrhetinic acid and cortisol hormones, which are structurally similar, and developed medicinal plant-based nutritional regulators that replace antibiotics and hormones. These products have been successfully applied in pig farms in Hunan, Guangdong, Fujian, and Shanghai. As a result, the diarrhea rate in weaned piglets dropped by 90%, survival rates increased from 90% to 97%, weight gain rose by 5% to 8%, and feed costs were reduced by 15 to 20 yuan per ton. Moreover, stress responses were minimized, leading to fewer intestinal and respiratory diseases, and a significant reduction in antibiotic use. To date, this green, highly effective piglet feed has been promoted over 380,000 tons, generating an additional output value of 1.6 billion yuan. The economic, social, and ecological benefits are substantial.